diff options
| -rw-r--r-- | Documentation/powerpc/kvm_440.txt | 41 | ||||
| -rw-r--r-- | arch/powerpc/Kconfig | 1 | ||||
| -rw-r--r-- | arch/powerpc/Kconfig.debug | 3 | ||||
| -rw-r--r-- | arch/powerpc/Makefile | 1 | ||||
| -rw-r--r-- | arch/powerpc/kernel/asm-offsets.c | 28 | ||||
| -rw-r--r-- | arch/powerpc/kvm/44x_tlb.c | 224 | ||||
| -rw-r--r-- | arch/powerpc/kvm/44x_tlb.h | 91 | ||||
| -rw-r--r-- | arch/powerpc/kvm/Kconfig | 42 | ||||
| -rw-r--r-- | arch/powerpc/kvm/Makefile | 15 | ||||
| -rw-r--r-- | arch/powerpc/kvm/booke_guest.c | 615 | ||||
| -rw-r--r-- | arch/powerpc/kvm/booke_host.c | 83 | ||||
| -rw-r--r-- | arch/powerpc/kvm/booke_interrupts.S | 436 | ||||
| -rw-r--r-- | arch/powerpc/kvm/emulate.c | 760 | ||||
| -rw-r--r-- | arch/powerpc/kvm/powerpc.c | 436 | ||||
| -rw-r--r-- | include/asm-powerpc/kvm.h | 53 | ||||
| -rw-r--r-- | include/asm-powerpc/kvm_asm.h | 55 | ||||
| -rw-r--r-- | include/asm-powerpc/kvm_host.h | 152 | ||||
| -rw-r--r-- | include/asm-powerpc/kvm_para.h | 37 | ||||
| -rw-r--r-- | include/asm-powerpc/kvm_ppc.h | 88 |
19 files changed, 3159 insertions, 2 deletions
diff --git a/Documentation/powerpc/kvm_440.txt b/Documentation/powerpc/kvm_440.txt new file mode 100644 index 0000000..c02a003 --- /dev/null +++ b/Documentation/powerpc/kvm_440.txt @@ -0,0 +1,41 @@ +Hollis Blanchard <hollisb@us.ibm.com> +15 Apr 2008 + +Various notes on the implementation of KVM for PowerPC 440: + +To enforce isolation, host userspace, guest kernel, and guest userspace all +run at user privilege level. Only the host kernel runs in supervisor mode. +Executing privileged instructions in the guest traps into KVM (in the host +kernel), where we decode and emulate them. Through this technique, unmodified +440 Linux kernels can be run (slowly) as guests. Future performance work will +focus on reducing the overhead and frequency of these traps. + +The usual code flow is started from userspace invoking an "run" ioctl, which +causes KVM to switch into guest context. We use IVPR to hijack the host +interrupt vectors while running the guest, which allows us to direct all +interrupts to kvmppc_handle_interrupt(). At this point, we could either +- handle the interrupt completely (e.g. emulate "mtspr SPRG0"), or +- let the host interrupt handler run (e.g. when the decrementer fires), or +- return to host userspace (e.g. when the guest performs device MMIO) + +Address spaces: We take advantage of the fact that Linux doesn't use the AS=1 +address space (in host or guest), which gives us virtual address space to use +for guest mappings. While the guest is running, the host kernel remains mapped +in AS=0, but the guest can only use AS=1 mappings. + +TLB entries: The TLB entries covering the host linear mapping remain +present while running the guest. This reduces the overhead of lightweight +exits, which are handled by KVM running in the host kernel. We keep three +copies of the TLB: + - guest TLB: contents of the TLB as the guest sees it + - shadow TLB: the TLB that is actually in hardware while guest is running + - host TLB: to restore TLB state when context switching guest -> host +When a TLB miss occurs because a mapping was not present in the shadow TLB, +but was present in the guest TLB, KVM handles the fault without invoking the +guest. Large guest pages are backed by multiple 4KB shadow pages through this +mechanism. + +IO: MMIO and DCR accesses are emulated by userspace. We use virtio for network +and block IO, so those drivers must be enabled in the guest. It's possible +that some qemu device emulation (e.g. e1000 or rtl8139) may also work with +little effort. diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 20f45a8..4e40c12 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -803,3 +803,4 @@ config PPC_CLOCK config PPC_LIB_RHEAP bool +source "arch/powerpc/kvm/Kconfig" diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug index a86d8d8..807a2dc 100644 --- a/arch/powerpc/Kconfig.debug +++ b/arch/powerpc/Kconfig.debug @@ -151,6 +151,9 @@ config BOOTX_TEXT config PPC_EARLY_DEBUG bool "Early debugging (dangerous)" + # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water + # mark, which doesn't work with current 440 KVM. + depends on !KVM help Say Y to enable some early debugging facilities that may be available for your processor/board combination. Those facilities are hacks diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index e2ec4a9..9dcdc03 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -145,6 +145,7 @@ core-y += arch/powerpc/kernel/ \ arch/powerpc/platforms/ core-$(CONFIG_MATH_EMULATION) += arch/powerpc/math-emu/ core-$(CONFIG_XMON) += arch/powerpc/xmon/ +core-$(CONFIG_KVM) += arch/powerpc/kvm/ drivers-$(CONFIG_OPROFILE) += arch/powerpc/oprofile/ diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index adf1d09..6213484 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -23,6 +23,9 @@ #include <linux/mm.h> #include <linux/suspend.h> #include <linux/hrtimer.h> +#ifdef CONFIG_KVM +#include <linux/kvm_host.h> +#endif #ifdef CONFIG_PPC64 #include <linux/time.h> #include <linux/hardirq.h> @@ -324,5 +327,30 @@ int main(void) DEFINE(PGD_TABLE_SIZE, PGD_TABLE_SIZE); +#ifdef CONFIG_KVM + DEFINE(TLBE_BYTES, sizeof(struct tlbe)); + + DEFINE(VCPU_HOST_STACK, offsetof(struct kvm_vcpu, arch.host_stack)); + DEFINE(VCPU_HOST_PID, offsetof(struct kvm_vcpu, arch.host_pid)); + DEFINE(VCPU_HOST_TLB, offsetof(struct kvm_vcpu, arch.host_tlb)); + DEFINE(VCPU_SHADOW_TLB, offsetof(struct kvm_vcpu, arch.shadow_tlb)); + DEFINE(VCPU_GPRS, offsetof(struct kvm_vcpu, arch.gpr)); + DEFINE(VCPU_LR, offsetof(struct kvm_vcpu, arch.lr)); + DEFINE(VCPU_CR, offsetof(struct kvm_vcpu, arch.cr)); + DEFINE(VCPU_XER, offsetof(struct kvm_vcpu, arch.xer)); + DEFINE(VCPU_CTR, offsetof(struct kvm_vcpu, arch.ctr)); + DEFINE(VCPU_PC, offsetof(struct kvm_vcpu, arch.pc)); + DEFINE(VCPU_MSR, offsetof(struct kvm_vcpu, arch.msr)); + DEFINE(VCPU_SPRG4, offsetof(struct kvm_vcpu, arch.sprg4)); + DEFINE(VCPU_SPRG5, offsetof(struct kvm_vcpu, arch.sprg5)); + DEFINE(VCPU_SPRG6, offsetof(struct kvm_vcpu, arch.sprg6)); + DEFINE(VCPU_SPRG7, offsetof(struct kvm_vcpu, arch.sprg7)); + DEFINE(VCPU_PID, offsetof(struct kvm_vcpu, arch.pid)); + + DEFINE(VCPU_LAST_INST, offsetof(struct kvm_vcpu, arch.last_inst)); + DEFINE(VCPU_FAULT_DEAR, offsetof(struct kvm_vcpu, arch.fault_dear)); + DEFINE(VCPU_FAULT_ESR, offsetof(struct kvm_vcpu, arch.fault_esr)); +#endif + return 0; } diff --git a/arch/powerpc/kvm/44x_tlb.c b/arch/powerpc/kvm/44x_tlb.c new file mode 100644 index 0000000..f5d7a5e --- /dev/null +++ b/arch/powerpc/kvm/44x_tlb.c @@ -0,0 +1,224 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright IBM Corp. 2007 + * + * Authors: Hollis Blanchard <hollisb@us.ibm.com> + */ + +#include <linux/types.h> +#include <linux/string.h> +#include <linux/kvm_host.h> +#include <linux/highmem.h> +#include <asm/mmu-44x.h> +#include <asm/kvm_ppc.h> + +#include "44x_tlb.h" + +#define PPC44x_TLB_USER_PERM_MASK (PPC44x_TLB_UX|PPC44x_TLB_UR|PPC44x_TLB_UW) +#define PPC44x_TLB_SUPER_PERM_MASK (PPC44x_TLB_SX|PPC44x_TLB_SR|PPC44x_TLB_SW) + +static unsigned int kvmppc_tlb_44x_pos; + +static u32 kvmppc_44x_tlb_shadow_attrib(u32 attrib, int usermode) +{ + /* Mask off reserved bits. */ + attrib &= PPC44x_TLB_PERM_MASK|PPC44x_TLB_ATTR_MASK; + + if (!usermode) { + /* Guest is in supervisor mode, so we need to translate guest + * supervisor permissions into user permissions. */ + attrib &= ~PPC44x_TLB_USER_PERM_MASK; + attrib |= (attrib & PPC44x_TLB_SUPER_PERM_MASK) << 3; + } + + /* Make sure host can always access this memory. */ + attrib |= PPC44x_TLB_SX|PPC44x_TLB_SR|PPC44x_TLB_SW; + + return attrib; +} + +/* Search the guest TLB for a matching entry. */ +int kvmppc_44x_tlb_index(struct kvm_vcpu *vcpu, gva_t eaddr, unsigned int pid, + unsigned int as) +{ + int i; + + /* XXX Replace loop with fancy data structures. */ + for (i = 0; i < PPC44x_TLB_SIZE; i++) { + struct tlbe *tlbe = &vcpu->arch.guest_tlb[i]; + unsigned int tid; + + if (eaddr < get_tlb_eaddr(tlbe)) + continue; + + if (eaddr > get_tlb_end(tlbe)) + continue; + + tid = get_tlb_tid(tlbe); + if (tid && (tid != pid)) + continue; + + if (!get_tlb_v(tlbe)) + continue; + + if (get_tlb_ts(tlbe) != as) + continue; + + return i; + } + + return -1; +} + +struct tlbe *kvmppc_44x_itlb_search(struct kvm_vcpu *vcpu, gva_t eaddr) +{ + unsigned int as = !!(vcpu->arch.msr & MSR_IS); + unsigned int index; + + index = kvmppc_44x_tlb_index(vcpu, eaddr, vcpu->arch.pid, as); + if (index == -1) + return NULL; + return &vcpu->arch.guest_tlb[index]; +} + +struct tlbe *kvmppc_44x_dtlb_search(struct kvm_vcpu *vcpu, gva_t eaddr) +{ + unsigned int as = !!(vcpu->arch.msr & MSR_DS); + unsigned int index; + + index = kvmppc_44x_tlb_index(vcpu, eaddr, vcpu->arch.pid, as); + if (index == -1) + return NULL; + return &vcpu->arch.guest_tlb[index]; +} + +static int kvmppc_44x_tlbe_is_writable(struct tlbe *tlbe) +{ + return tlbe->word2 & (PPC44x_TLB_SW|PPC44x_TLB_UW); +} + +/* Must be called with mmap_sem locked for writing. */ +static void kvmppc_44x_shadow_release(struct kvm_vcpu *vcpu, + unsigned int index) +{ + struct tlbe *stlbe = &vcpu->arch.shadow_tlb[index]; + struct page *page = vcpu->arch.shadow_pages[index]; + + kunmap(vcpu->arch.shadow_pages[index]); + + if (get_tlb_v(stlbe)) { + if (kvmppc_44x_tlbe_is_writable(stlbe)) + kvm_release_page_dirty(page); + else + kvm_release_page_clean(page); + } +} + +/* Caller must ensure that the specified guest TLB entry is safe to insert into + * the shadow TLB. */ +void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gfn_t gfn, u64 asid, + u32 flags) +{ + struct page *new_page; + struct tlbe *stlbe; + hpa_t hpaddr; + unsigned int victim; + + /* Future optimization: don't overwrite the TLB entry containing the + * current PC (or stack?). */ + victim = kvmppc_tlb_44x_pos++; + if (kvmppc_tlb_44x_pos > tlb_44x_hwater) + kvmppc_tlb_44x_pos = 0; + stlbe = &vcpu->arch.shadow_tlb[victim]; + + /* Get reference to new page. */ + down_write(¤t->mm->mmap_sem); + new_page = gfn_to_page(vcpu->kvm, gfn); + if (is_error_page(new_page)) { + printk(KERN_ERR "Couldn't get guest page!\n"); + kvm_release_page_clean(new_page); + return; + } + hpaddr = page_to_phys(new_page); + + /* Drop reference to old page. */ + kvmppc_44x_shadow_release(vcpu, victim); + up_write(¤t->mm->mmap_sem); + + vcpu->arch.shadow_pages[victim] = new_page; + + /* XXX Make sure (va, size) doesn't overlap any other + * entries. 440x6 user manual says the result would be + * "undefined." */ + + /* XXX what about AS? */ + + stlbe->tid = asid & 0xff; + + /* Force TS=1 for all guest mappings. */ + /* For now we hardcode 4KB mappings, but it will be important to + * use host large pages in the future. */ + stlbe->word0 = (gvaddr & PAGE_MASK) | PPC44x_TLB_VALID | PPC44x_TLB_TS + | PPC44x_TLB_4K; + + stlbe->word1 = (hpaddr & 0xfffffc00) | ((hpaddr >> 32) & 0xf); + stlbe->word2 = kvmppc_44x_tlb_shadow_attrib(flags, + vcpu->arch.msr & MSR_PR); +} + +void kvmppc_mmu_invalidate(struct kvm_vcpu *vcpu, u64 eaddr, u64 asid) +{ + unsigned int pid = asid & 0xff; + int i; + + /* XXX Replace loop with fancy data structures. */ + down_write(¤t->mm->mmap_sem); + for (i = 0; i <= tlb_44x_hwater; i++) { + struct tlbe *stlbe = &vcpu->arch.shadow_tlb[i]; + unsigned int tid; + + if (!get_tlb_v(stlbe)) + continue; + + if (eaddr < get_tlb_eaddr(stlbe)) + continue; + + if (eaddr > get_tlb_end(stlbe)) + continue; + + tid = get_tlb_tid(stlbe); + if (tid && (tid != pid)) + continue; + + kvmppc_44x_shadow_release(vcpu, i); + stlbe->word0 = 0; + } + up_write(¤t->mm->mmap_sem); +} + +/* Invalidate all mappings, so that when they fault back in they will get the + * proper permission bits. */ +void kvmppc_mmu_priv_switch(struct kvm_vcpu *vcpu, int usermode) +{ + int i; + + /* XXX Replace loop with fancy data structures. */ + down_write(¤t->mm->mmap_sem); + for (i = 0; i <= tlb_44x_hwater; i++) { + kvmppc_44x_shadow_release(vcpu, i); + vcpu->arch.shadow_tlb[i].word0 = 0; + } + up_write(¤t->mm->mmap_sem); +} diff --git a/arch/powerpc/kvm/44x_tlb.h b/arch/powerpc/kvm/44x_tlb.h new file mode 100644 index 0000000..2ccd46b --- /dev/null +++ b/arch/powerpc/kvm/44x_tlb.h @@ -0,0 +1,91 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright IBM Corp. 2007 + * + * Authors: Hollis Blanchard <hollisb@us.ibm.com> + */ + +#ifndef __KVM_POWERPC_TLB_H__ +#define __KVM_POWERPC_TLB_H__ + +#include <linux/kvm_host.h> +#include <asm/mmu-44x.h> + +extern int kvmppc_44x_tlb_index(struct kvm_vcpu *vcpu, gva_t eaddr, + unsigned int pid, unsigned int as); +extern struct tlbe *kvmppc_44x_dtlb_search(struct kvm_vcpu *vcpu, gva_t eaddr); +extern struct tlbe *kvmppc_44x_itlb_search(struct kvm_vcpu *vcpu, gva_t eaddr); + +/* TLB helper functions */ +static inline unsigned int get_tlb_size(const struct tlbe *tlbe) +{ + return (tlbe->word0 >> 4) & 0xf; +} + +static inline gva_t get_tlb_eaddr(const struct tlbe *tlbe) +{ + return tlbe->word0 & 0xfffffc00; +} + +static inline gva_t get_tlb_bytes(const struct tlbe *tlbe) +{ + unsigned int pgsize = get_tlb_size(tlbe); + return 1 << 10 << (pgsize << 1); +} + +static inline gva_t get_tlb_end(const struct tlbe *tlbe) +{ + return get_tlb_eaddr(tlbe) + get_tlb_bytes(tlbe) - 1; +} + +static inline u64 get_tlb_raddr(const struct tlbe *tlbe) +{ + u64 word1 = tlbe->word1; + return ((word1 & 0xf) << 32) | (word1 & 0xfffffc00); +} + +static inline unsigned int get_tlb_tid(const struct tlbe *tlbe) +{ + return tlbe->tid & 0xff; +} + +static inline unsigned int get_tlb_ts(const struct tlbe *tlbe) +{ + return (tlbe->word0 >> 8) & 0x1; +} + +static inline unsigned int get_tlb_v(const struct tlbe *tlbe) +{ + return (tlbe->word0 >> 9) & 0x1; +} + +static inline unsigned int get_mmucr_stid(const struct kvm_vcpu *vcpu) +{ + return vcpu->arch.mmucr & 0xff; +} + +static inline unsigned int get_mmucr_sts(const struct kvm_vcpu *vcpu) +{ + return (vcpu->arch.mmucr >> 16) & 0x1; +} + +static inline gpa_t tlb_xlate(struct tlbe *tlbe, gva_t eaddr) +{ + unsigned int pgmask = get_tlb_bytes(tlbe) - 1; + + return get_tlb_raddr(tlbe) | (eaddr & pgmask); +} + +#endif /* __KVM_POWERPC_TLB_H__ */ diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig new file mode 100644 index 0000000..6b07601 --- /dev/null +++ b/arch/powerpc/kvm/Kconfig @@ -0,0 +1,42 @@ +# +# KVM configuration +# + +menuconfig VIRTUALIZATION + bool "Virtualization" + ---help--- + Say Y here to get to see options for using your Linux host to run + other operating systems inside virtual machines (guests). + This option alone does not add any kernel code. + + If you say N, all options in this submenu will be skipped and + disabled. + +if VIRTUALIZATION + +config KVM + bool "Kernel-based Virtual Machine (KVM) support" + depends on 44x && EXPERIMENTAL + select PREEMPT_NOTIFIERS + select ANON_INODES + # We can only run on Book E hosts so far + select KVM_BOOKE_HOST + ---help--- + Support hosting virtualized guest machines. You will also + need to select one or more of the processor modules below. + + This module provides access to the hardware capabilities through + a character device node named /dev/kvm. + + If unsure, say N. + +config KVM_BOOKE_HOST + bool "KVM host support for Book E PowerPC processors" + depends on KVM && 44x + ---help--- + Provides host support for KVM on Book E PowerPC processors. Currently + this works on 440 processors only. + +source drivers/virtio/Kconfig + +endif # VIRTUALIZATION diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile new file mode 100644 index 0000000..d0d358d --- /dev/null +++ b/arch/powerpc/kvm/Makefile @@ -0,0 +1,15 @@ +# +# Makefile for Kernel-based Virtual Machine module +# + +EXTRA_CFLAGS += -Ivirt/kvm -Iarch/powerpc/kvm + +common-objs = $(addprefix ../../../virt/kvm/, kvm_main.o) + +kvm-objs := $(common-objs) powerpc.o emulate.o booke_guest.o +obj-$(CONFIG_KVM) += kvm.o + +AFLAGS_booke_interrupts.o := -I$(obj) + +kvm-booke-host-objs := booke_host.o booke_interrupts.o 44x_tlb.o +obj-$(CONFIG_KVM_BOOKE_HOST) += kvm-booke-host.o diff --git a/arch/powerpc/kvm/booke_guest.c b/arch/powerpc/kvm/booke_guest.c new file mode 100644 index 0000000..6d9884a --- /dev/null +++ b/arch/powerpc/kvm/booke_guest.c @@ -0,0 +1,615 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright IBM Corp. 2007 + * + * Authors: Hollis Blanchard <hollisb@us.ibm.com> + * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> + */ + +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/kvm_host.h> +#include <linux/module.h> +#include <linux/vmalloc.h> +#include <linux/fs.h> +#include <asm/cputable.h> +#include <asm/uaccess.h> +#include <asm/kvm_ppc.h> + +#include "44x_tlb.h" + +#define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM +#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU + +struct kvm_stats_debugfs_item debugfs_entries[] = { + { "exits", VCPU_STAT(sum_exits) }, + { "mmio", VCPU_STAT(mmio_exits) }, + { "dcr", VCPU_STAT(dcr_exits) }, + { "sig", VCPU_STAT(signal_exits) }, + { "light", VCPU_STAT(light_exits) }, + { "itlb_r", VCPU_STAT(itlb_real_miss_exits) }, + { "itlb_v", VCPU_STAT(itlb_virt_miss_exits) }, + { "dtlb_r", VCPU_STAT(dtlb_real_miss_exits) }, + { "dtlb_v", VCPU_STAT(dtlb_virt_miss_exits) }, + { "sysc", VCPU_STAT(syscall_exits) }, + { "isi", VCPU_STAT(isi_exits) }, + { "dsi", VCPU_STAT(dsi_exits) }, + { "inst_emu", VCPU_STAT(emulated_inst_exits) }, + { "dec", VCPU_STAT(dec_exits) }, + { "ext_intr", VCPU_STAT(ext_intr_exits) }, + { NULL } +}; + +static const u32 interrupt_msr_mask[16] = { + [BOOKE_INTERRUPT_CRITICAL] = MSR_ME, + [BOOKE_INTERRUPT_MACHINE_CHECK] = 0, + [BOOKE_INTERRUPT_DATA_STORAGE] = MSR_CE|MSR_ME|MSR_DE, + [BOOKE_INTERRUPT_INST_STORAGE] = MSR_CE|MSR_ME|MSR_DE, + [BOOKE_INTERRUPT_EXTERNAL] = MSR_CE|MSR_ME|MSR_DE, + [BOOKE_INTERRUPT_ALIGNMENT] = MSR_CE|MSR_ME|MSR_DE, + [BOOKE_INTERRUPT_PROGRAM] = MSR_CE|MSR_ME|MSR_DE, + [BOOKE_INTERRUPT_FP_UNAVAIL] = MSR_CE|MSR_ME|MSR_DE, + [BOOKE_INTERRUPT_SYSCALL] = MSR_CE|MSR_ME|MSR_DE, + [BOOKE_INTERRUPT_AP_UNAVAIL] = MSR_CE|MSR_ME|MSR_DE, + [BOOKE_INTERRUPT_DECREMENTER] = MSR_CE|MSR_ME|MSR_DE, + [BOOKE_INTERRUPT_FIT] = MSR_CE|MSR_ME|MSR_DE, + [BOOKE_INTERRUPT_WATCHDOG] = MSR_ME, + [BOOKE_INTERRUPT_DTLB_MISS] = MSR_CE|MSR_ME|MSR_DE, + [BOOKE_INTERRUPT_ITLB_MISS] = MSR_CE|MSR_ME|MSR_DE, + [BOOKE_INTERRUPT_DEBUG] = MSR_ME, +}; + +const unsigned char exception_priority[] = { + [BOOKE_INTERRUPT_DATA_STORAGE] = 0, + [BOOKE_INTERRUPT_INST_STORAGE] = 1, + [BOOKE_INTERRUPT_ALIGNMENT] = 2, + [BOOKE_INTERRUPT_PROGRAM] = 3, + [BOOKE_INTERRUPT_FP_UNAVAIL] = 4, + [BOOKE_INTERRUPT_SYSCALL] = 5, + [BOOKE_INTERRUPT_AP_UNAVAIL] = 6, + [BOOKE_INTERRUPT_DTLB_MISS] = 7, + [BOOKE_INTERRUPT_ITLB_MISS] = 8, + [BOOKE_INTERRUPT_MACHINE_CHECK] = 9, + [BOOKE_INTERRUPT_DEBUG] = 10, + [BOOKE_INTERRUPT_CRITICAL] = 11, + [BOOKE_INTERRUPT_WATCHDOG] = 12, + [BOOKE_INTERRUPT_EXTERNAL] = 13, + [BOOKE_INTERRUPT_FIT] = 14, + [BOOKE_INTERRUPT_DECREMENTER] = 15, +}; + +const unsigned char priority_exception[] = { + BOOKE_INTERRUPT_DATA_STORAGE, + BOOKE_INTERRUPT_INST_STORAGE, + BOOKE_INTERRUPT_ALIGNMENT, + BOOKE_INTERRUPT_PROGRAM, + BOOKE_INTERRUPT_FP_UNAVAIL, + BOOKE_INTERRUPT_SYSCALL, + BOOKE_INTERRUPT_AP_UNAVAIL, + BOOKE_INTERRUPT_DTLB_MISS, + BOOKE_INTERRUPT_ITLB_MISS, + BOOKE_INTERRUPT_MACHINE_CHECK, + BOOKE_INTERRUPT_DEBUG, + BOOKE_INTERRUPT_CRITICAL, + BOOKE_INTERRUPT_WATCHDOG, + BOOKE_INTERRUPT_EXTERNAL, + BOOKE_INTERRUPT_FIT, + BOOKE_INTERRUPT_DECREMENTER, +}; + + +void kvmppc_dump_tlbs(struct kvm_vcpu *vcpu) +{ + struct tlbe *tlbe; + int i; + + printk("vcpu %d TLB dump:\n", vcpu->vcpu_id); + printk("| %2s | %3s | %8s | %8s | %8s |\n", + "nr", "tid", "word0", "word1", "word2"); + + for (i = 0; i < PPC44x_TLB_SIZE; i++) { + tlbe = &vcpu->arch.guest_tlb[i]; + if (tlbe->word0 & PPC44x_TLB_VALID) + printk(" G%2d | %02X | %08X | %08X | %08X |\n", + i, tlbe->tid, tlbe->word0, tlbe->word1, + tlbe->word2); + } + + for (i = 0; i < PPC44x_TLB_SIZE; i++) { + tlbe = &vcpu->arch.shadow_tlb[i]; + if (tlbe->word0 & PPC44x_TLB_VALID) + printk(" S%2d | %02X | %08X | %08X | %08X |\n", + i, tlbe->tid, tlbe->word0, tlbe->word1, + tlbe->word2); + } +} + +/* TODO: use vcpu_printf() */ +void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu) +{ + int i; + + printk("pc: %08x msr: %08x\n", vcpu->arch.pc, vcpu->arch.msr); + printk("lr: %08x ctr: %08x\n", vcpu->arch.lr, vcpu->arch.ctr); + printk("srr0: %08x srr1: %08x\n", vcpu->arch.srr0, vcpu->arch.srr1); + + printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions); + + for (i = 0; i < 32; i += 4) { + printk("gpr%02d: %08x %08x %08x %08x\n", i, + vcpu->arch.gpr[i], + vcpu->arch.gpr[i+1], + vcpu->arch.gpr[i+2], + vcpu->arch.gpr[i+3]); + } +} + +/* Check if we are ready to deliver the interrupt */ +static int kvmppc_can_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt) +{ + int r; + + switch (interrupt) { + case BOOKE_INTERRUPT_CRITICAL: + r = vcpu->arch.msr & MSR_CE; + break; + case BOOKE_INTERRUPT_MACHINE_CHECK: + r = vcpu->arch.msr & MSR_ME; + break; + case BOOKE_INTERRUPT_EXTERNAL: + r = vcpu->arch.msr & MSR_EE; + break; + case BOOKE_INTERRUPT_DECREMENTER: + r = vcpu->arch.msr & MSR_EE; + break; + case BOOKE_INTERRUPT_FIT: + r = vcpu->arch.msr & MSR_EE; + break; + case BOOKE_INTERRUPT_WATCHDOG: + r = vcpu->arch.msr & MSR_CE; + break; + case BOOKE_INTERRUPT_DEBUG: + r = vcpu->arch.msr & MSR_DE; + break; + default: + r = 1; + } + + return r; +} + +static void kvmppc_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt) +{ + switch (interrupt) { + case BOOKE_INTERRUPT_DECREMENTER: + vcpu->arch.tsr |= TSR_DIS; + break; + } + + vcpu->arch.srr0 = vcpu->arch.pc; + vcpu->arch.srr1 = vcpu->arch.msr; + vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[interrupt]; + kvmppc_set_msr(vcpu, vcpu->arch.msr & interrupt_msr_mask[interrupt]); +} + +/* Check pending exceptions and deliver one, if possible. */ +void kvmppc_check_and_deliver_interrupts(struct kvm_vcpu *vcpu) +{ + unsigned long *pending = &vcpu->arch.pending_exceptions; + unsigned int exception; + unsigned int priority; + + priority = find_first_bit(pending, BITS_PER_BYTE * sizeof(*pending)); + while (priority <= BOOKE_MAX_INTERRUPT) { + exception = priority_exception[priority]; + if (kvmppc_can_deliver_interrupt(vcpu, exception)) { + kvmppc_clear_exception(vcpu, exception); + kvmppc_deliver_interrupt(vcpu, exception); + break; + } + + priority = find_next_bit(pending, + BITS_PER_BYTE * sizeof(*pending), + priority + 1); + } +} + +static int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu) +{ + enum emulation_result er; + int r; + + er = kvmppc_emulate_instruction(run, vcpu); + switch (er) { + case EMULATE_DONE: + /* Future optimization: only reload non-volatiles if they were + * actually modified. */ + r = RESUME_GUEST_NV; + break; + case EMULATE_DO_MMIO: + run->exit_reason = KVM_EXIT_MMIO; + /* We must reload nonvolatiles because "update" load/store + * instructions modify register state. */ + /* Future optimization: only reload non-volatiles if they were + * actually modified. */ + r = RESUME_HOST_NV; + break; + case EMULATE_FAIL: + /* XXX Deliver Program interrupt to guest. */ + printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__, + vcpu->arch.last_inst); + r = RESUME_HOST; + break; + default: + BUG(); + } + + return r; +} + +/** + * kvmppc_handle_exit + * + * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV) + */ +int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, + unsigned int exit_nr) +{ + enum emulation_result er; + int r = RESUME_HOST; + + local_irq_enable(); + + run->exit_reason = KVM_EXIT_UNKNOWN; + run->ready_for_interrupt_injection = 1; + + switch (exit_nr) { + case BOOKE_INTERRUPT_MACHINE_CHECK: + printk("MACHINE CHECK: %lx\n", mfspr(SPRN_MCSR)); + kvmppc_dump_vcpu(vcpu); + r = RESUME_HOST; + break; + + case BOOKE_INTERRUPT_EXTERNAL: + case BOOKE_INTERRUPT_DECREMENTER: + /* Since we switched IVPR back to the host's value, the host + * handled this interrupt the moment we enabled interrupts. + * Now we just offer it a chance to reschedule the guest. */ + + /* XXX At this point the TLB still holds our shadow TLB, so if + * we do reschedule the host will fault over it. Perhaps we + * should politely restore the host's entries to minimize + * misses before ceding control. */ + if (need_resched()) + cond_resched(); + if (exit_nr == BOOKE_INTERRUPT_DECREMENTER) + vcpu->stat.dec_exits++; + else + vcpu->stat.ext_intr_exits++; + r = RESUME_GUEST; + break; + + case BOOKE_INTERRUPT_PROGRAM: + if (vcpu->arch.msr & MSR_PR) { + /* Program traps generated by user-level software must be handled + * by the guest kernel. */ + vcpu->arch.esr = vcpu->arch.fault_esr; + kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM); + r = RESUME_GUEST; + break; + } + + er = kvmppc_emulate_instruction(run, vcpu); + switch (er) { + case EMULATE_DONE: + /* Future optimization: only reload non-volatiles if + * they were actually modified by emulation. */ + vcpu->stat.emulated_inst_exits++; + r = RESUME_GUEST_NV; + break; + case EMULATE_DO_DCR: + run->exit_reason = KVM_EXIT_DCR; + r = RESUME_HOST; + break; + case EMULATE_FAIL: + /* XXX Deliver Program interrupt to guest. */ + printk(KERN_CRIT "%s: emulation at %x failed (%08x)\n", + __func__, vcpu->arch.pc, vcpu->arch.last_inst); + /* For debugging, encode the failing instruction and + * report it to userspace. */ + run->hw.hardware_exit_reason = ~0ULL << 32; + run->hw.hardware_exit_reason |= vcpu->arch.last_inst; + r = RESUME_HOST; + break; + default: + BUG(); + } + break; + + case BOOKE_INTERRUPT_DATA_STORAGE: + vcpu->arch.dear = vcpu->arch.fault_dear; + vcpu->arch.esr = vcpu->arch.fault_esr; + kvmppc_queue_exception(vcpu, exit_nr); + vcpu->stat.dsi_exits++; + r = RESUME_GUEST; + break; + + case BOOKE_INTERRUPT_INST_STORAGE: + vcpu->arch.esr = vcpu->arch.fault_esr; + kvmppc_queue_exception(vcpu, exit_nr); + vcpu->stat.isi_exits++; + r = RESUME_GUEST; + break; + + case BOOKE_INTERRUPT_SYSCALL: + kvmppc_queue_exception(vcpu, exit_nr); + vcpu->stat.syscall_exits++; + r = RESUME_GUEST; + break; + + case BOOKE_INTERRUPT_DTLB_MISS: { + struct tlbe *gtlbe; + unsigned long eaddr = vcpu->arch.fault_dear; + gfn_t gfn; + + /* Check the guest TLB. */ + gtlbe = kvmppc_44x_dtlb_search(vcpu, eaddr); + if (!gtlbe) { + /* The guest didn't have a mapping for it. */ + kvmppc_queue_exception(vcpu, exit_nr); + vcpu->arch.dear = vcpu->arch.fault_dear; + vcpu->arch.esr = vcpu->arch.fault_esr; + vcpu->stat.dtlb_real_miss_exits++; + r = RESUME_GUEST; + break; + } + + vcpu->arch.paddr_accessed = tlb_xlate(gtlbe, eaddr); + gfn = vcpu->arch.paddr_accessed >> PAGE_SHIFT; + + if (kvm_is_visible_gfn(vcpu->kvm, gfn)) { + /* The guest TLB had a mapping, but the shadow TLB + * didn't, and it is RAM. This could be because: + * a) the entry is mapping the host kernel, or + * b) the guest used a large mapping which we're faking + * Either way, we need to satisfy the fault without + * invoking the guest. */ + kvmppc_mmu_map(vcpu, eaddr, gfn, gtlbe->tid, + gtlbe->word2); + vcpu->stat.dtlb_virt_miss_exits++; + r = RESUME_GUEST; + } else { + /* Guest has mapped and accessed a page which is not + * actually RAM. */ + r = kvmppc_emulate_mmio(run, vcpu); + } + + break; + } + + case BOOKE_INTERRUPT_ITLB_MISS: { + struct tlbe *gtlbe; + unsigned long eaddr = vcpu->arch.pc; + gfn_t gfn; + + r = RESUME_GUEST; + + /* Check the guest TLB. */ + gtlbe = kvmppc_44x_itlb_search(vcpu, eaddr); + if (!gtlbe) { + /* The guest didn't have a mapping for it. */ + kvmppc_queue_exception(vcpu, exit_nr); + vcpu->stat.itlb_real_miss_exits++; + break; + } + + vcpu->stat.itlb_virt_miss_exits++; + + gfn = tlb_xlate(gtlbe, eaddr) >> PAGE_SHIFT; + + if (kvm_is_visible_gfn(vcpu->kvm, gfn)) { + /* The guest TLB had a mapping, but the shadow TLB + * didn't. This could be because: + * a) the entry is mapping the host kernel, or + * b) the guest used a large mapping which we're faking + * Either way, we need to satisfy the fault without + * invoking the guest. */ + kvmppc_mmu_map(vcpu, eaddr, gfn, gtlbe->tid, + gtlbe->word2); + } else { + /* Guest mapped and leaped at non-RAM! */ + kvmppc_queue_exception(vcpu, + BOOKE_INTERRUPT_MACHINE_CHECK); + } + + break; + } + + default: + printk(KERN_EMERG "exit_nr %d\n", exit_nr); + BUG(); + } + + local_irq_disable(); + + kvmppc_check_and_deliver_interrupts(vcpu); + + /* Do some exit accounting. */ + vcpu->stat.sum_exits++; + if (!(r & RESUME_HOST)) { + /* To avoid clobbering exit_reason, only check for signals if + * we aren't already exiting to userspace for some other + * reason. */ + if (signal_pending(current)) { + run->exit_reason = KVM_EXIT_INTR; + r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV); + + vcpu->stat.signal_exits++; + } else { + vcpu->stat.light_exits++; + } + } else { + switch (run->exit_reason) { + case KVM_EXIT_MMIO: + vcpu->stat.mmio_exits++; + break; + case KVM_EXIT_DCR: + vcpu->stat.dcr_exits++; + break; + case KVM_EXIT_INTR: + vcpu->stat.signal_exits++; + break; + } + } + + return r; +} + +/* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */ +int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) +{ + struct tlbe *tlbe = &vcpu->arch.guest_tlb[0]; + + tlbe->tid = 0; + tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID; + tlbe->word1 = 0; + tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR; + + tlbe++; + tlbe->tid = 0; + tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID; + tlbe->word1 = 0xef600000; + tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR + | PPC44x_TLB_I | PPC44x_TLB_G; + + vcpu->arch.pc = 0; + vcpu->arch.msr = 0; + vcpu->arch.gpr[1] = (16<<20) - 8; /* -8 for the callee-save LR slot */ + + /* Eye-catching number so we know if the guest takes an interrupt + * before it's programmed its own IVPR. */ + vcpu->arch.ivpr = 0x55550000; + + /* Since the guest can directly access the timebase, it must know the + * real timebase frequency. Accordingly, it must see the state of + * CCR1[TCS]. */ + vcpu->arch.ccr1 = mfspr(SPRN_CCR1); + + return 0; +} + +int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) +{ + int i; + + regs->pc = vcpu->arch.pc; + regs->cr = vcpu->arch.cr; + regs->ctr = vcpu->arch.ctr; + regs->lr = vcpu->arch.lr; + regs->xer = vcpu->arch.xer; + regs->msr = vcpu->arch.msr; + regs->srr0 = vcpu->arch.srr0; + regs->srr1 = vcpu->arch.srr1; + regs->pid = vcpu->arch.pid; + regs->sprg0 = vcpu->arch.sprg0; + regs->sprg1 = vcpu->arch.sprg1; + regs->sprg2 = vcpu->arch.sprg2; + regs->sprg3 = vcpu->arch.sprg3; + regs->sprg5 = vcpu->arch.sprg4; + regs->sprg6 = vcpu->arch.sprg5; + regs->sprg7 = vcpu->arch.sprg6; + + for (i = 0; i < ARRAY_SIZE(regs->gpr); i++) + regs->gpr[i] = vcpu->arch.gpr[i]; + + return 0; +} + +int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) +{ + int i; + + vcpu->arch.pc = regs->pc; + vcpu->arch.cr = regs->cr; + vcpu->arch.ctr = regs->ctr; + vcpu->arch.lr = regs->lr; + vcpu->arch.xer = regs->xer; + vcpu->arch.msr = regs->msr; + vcpu->arch.srr0 = regs->srr0; + vcpu->arch.srr1 = regs->srr1; + vcpu->arch.sprg0 = regs->sprg0; + vcpu->arch.sprg1 = regs->sprg1; + vcpu->arch.sprg2 = regs->sprg2; + vcpu->arch.sprg3 = regs->sprg3; + vcpu->arch.sprg5 = regs->sprg4; + vcpu->arch.sprg6 = regs->sprg5; + vcpu->arch.sprg7 = regs->sprg6; + + for (i = 0; i < ARRAY_SIZE(vcpu->arch.gpr); i++) + vcpu->arch.gpr[i] = regs->gpr[i]; + + return 0; +} + +int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) +{ + return -ENOTSUPP; +} + +int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) +{ + return -ENOTSUPP; +} + +int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) +{ + return -ENOTSUPP; +} + +int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) +{ + return -ENOTSUPP; +} + +/* 'linear_address' is actually an encoding of AS|PID|EADDR . */ +int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, + struct kvm_translation *tr) +{ + struct tlbe *gtlbe; + int index; + gva_t eaddr; + u8 pid; + u8 as; + + eaddr = tr->linear_address; + pid = (tr->linear_address >> 32) & 0xff; + as = (tr->linear_address >> 40) & 0x1; + + index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as); + if (index == -1) { + tr->valid = 0; + return 0; + } + + gtlbe = &vcpu->arch.guest_tlb[index]; + + tr->physical_address = tlb_xlate(gtlbe, eaddr); + /* XXX what does "writeable" and "usermode" even mean? */ + tr->valid = 1; + + return 0; +} diff --git a/arch/powerpc/kvm/booke_host.c b/arch/powerpc/kvm/booke_host.c new file mode 100644 index 0000000..b480341 --- /dev/null +++ b/arch/powerpc/kvm/booke_host.c @@ -0,0 +1,83 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright IBM Corp. 2008 + * + * Authors: Hollis Blanchard <hollisb@us.ibm.com> + */ + +#include <linux/errno.h> +#include <linux/kvm_host.h> +#include <linux/module.h> +#include <asm/cacheflush.h> +#include <asm/kvm_ppc.h> + +unsigned long kvmppc_booke_handlers; + +static int kvmppc_booke_init(void) +{ + unsigned long ivor[16]; + unsigned long max_ivor = 0; + int i; + + /* We install our own exception handlers by hijacking IVPR. IVPR must + * be 16-bit aligned, so we need a 64KB allocation. */ + kvmppc_booke_handlers = __get_free_pages(GFP_KERNEL | __GFP_ZERO, + VCPU_SIZE_ORDER); + if (!kvmppc_booke_handlers) + return -ENOMEM; + + /* XXX make sure our handlers are smaller than Linux's */ + + /* Copy our interrupt handlers to match host IVORs. That way we don't + * have to swap the IVORs on every guest/host transition. */ + ivor[0] = mfspr(SPRN_IVOR0); + ivor[1] = mfspr(SPRN_IVOR1); + ivor[2] = mfspr(SPRN_IVOR2); + ivor[3] = mfspr(SPRN_IVOR3); + ivor[4] = mfspr(SPRN_IVOR4); + ivor[5] = mfspr(SPRN_IVOR5); + ivor[6] = mfspr(SPRN_IVOR6); + ivor[7] = mfspr(SPRN_IVOR7); + ivor[8] = mfspr(SPRN_IVOR8); + ivor[9] = mfspr(SPRN_IVOR9); + ivor[10] = mfspr(SPRN_IVOR10); + ivor[11] = mfspr(SPRN_IVOR11); + ivor[12] = mfspr(SPRN_IVOR12); + ivor[13] = mfspr(SPRN_IVOR13); + ivor[14] = mfspr(SPRN_IVOR14); + ivor[15] = mfspr(SPRN_IVOR15); + + for (i = 0; i < 16; i++) { + if (ivor[i] > max_ivor) + max_ivor = ivor[i]; + + memcpy((void *)kvmppc_booke_handlers + ivor[i], + kvmppc_handlers_start + i * kvmppc_handler_len, + kvmppc_handler_len); + } + flush_icache_range(kvmppc_booke_handlers, + kvmppc_booke_handlers + max_ivor + kvmppc_handler_len); + + return kvm_init(NULL, sizeof(struct kvm_vcpu), THIS_MODULE); +} + +static void __exit kvmppc_booke_exit(void) +{ + free_pages(kvmppc_booke_handlers, VCPU_SIZE_ORDER); + kvm_exit(); +} + +module_init(kvmppc_booke_init) +module_exit(kvmppc_booke_exit) diff --git a/arch/powerpc/kvm/booke_interrupts.S b/arch/powerpc/kvm/booke_interrupts.S new file mode 100644 index 0000000..3b653b5 --- /dev/null +++ b/arch/powerpc/kvm/booke_interrupts.S @@ -0,0 +1,436 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright IBM Corp. 2007 + * + * Authors: Hollis Blanchard <hollisb@us.ibm.com> + */ + +#include <asm/ppc_asm.h> +#include <asm/kvm_asm.h> +#include <asm/reg.h> +#include <asm/mmu-44x.h> +#include <asm/page.h> +#include <asm/asm-offsets.h> + +#define KVMPPC_MSR_MASK (MSR_CE|MSR_EE|MSR_PR|MSR_DE|MSR_ME|MSR_IS|MSR_DS) + +#define VCPU_GPR(n) (VCPU_GPRS + (n * 4)) + +/* The host stack layout: */ +#define HOST_R1 0 /* Implied by stwu. */ +#define HOST_CALLEE_LR 4 +#define HOST_RUN 8 +/* r2 is special: it holds 'current', and it made nonvolatile in the + * kernel with the -ffixed-r2 gcc option. */ +#define HOST_R2 12 +#define HOST_NV_GPRS 16 +#define HOST_NV_GPR(n) (HOST_NV_GPRS + ((n - 14) * 4)) +#define HOST_MIN_STACK_SIZE (HOST_NV_GPR(31) + 4) +#define HOST_STACK_SIZE (((HOST_MIN_STACK_SIZE + 15) / 16) * 16) /* Align. */ +#define HOST_STACK_LR (HOST_STACK_SIZE + 4) /* In caller stack frame. */ + +#define NEED_INST_MASK ((1<<BOOKE_INTERRUPT_PROGRAM) | \ + (1<<BOOKE_INTERRUPT_DTLB_MISS)) + +#define NEED_DEAR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \ + (1<<BOOKE_INTERRUPT_DTLB_MISS)) + +#define NEED_ESR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \ + (1<<BOOKE_INTERRUPT_INST_STORAGE) | \ + (1<<BOOKE_INTERRUPT_PROGRAM) | \ + (1<<BOOKE_INTERRUPT_DTLB_MISS)) + +.macro KVM_HANDLER ivor_nr +_GLOBAL(kvmppc_handler_\ivor_nr) + /* Get pointer to vcpu and record exit number. */ + mtspr SPRN_SPRG0, r4 + mfspr r4, SPRN_SPRG1 + stw r5, VCPU_GPR(r5)(r4) + stw r6, VCPU_GPR(r6)(r4) + mfctr r5 + lis r6, kvmppc_resume_host@h + stw r5, VCPU_CTR(r4) + li r5, \ivor_nr + ori r6, r6, kvmppc_resume_host@l + mtctr r6 + bctr +.endm + +_GLOBAL(kvmppc_handlers_start) +KVM_HANDLER BOOKE_INTERRUPT_CRITICAL +KVM_HANDLER BOOKE_INTERRUPT_MACHINE_CHECK +KVM_HANDLER BOOKE_INTERRUPT_DATA_STORAGE +KVM_HANDLER BOOKE_INTERRUPT_INST_STORAGE +KVM_HANDLER BOOKE_INTERRUPT_EXTERNAL +KVM_HANDLER BOOKE_INTERRUPT_ALIGNMENT +KVM_HANDLER BOOKE_INTERRUPT_PROGRAM +KVM_HANDLER BOOKE_INTERRUPT_FP_UNAVAIL +KVM_HANDLER BOOKE_INTERRUPT_SYSCALL +KVM_HANDLER BOOKE_INTERRUPT_AP_UNAVAIL +KVM_HANDLER BOOKE_INTERRUPT_DECREMENTER +KVM_HANDLER BOOKE_INTERRUPT_FIT +KVM_HANDLER BOOKE_INTERRUPT_WATCHDOG +KVM_HANDLER BOOKE_INTERRUPT_DTLB_MISS +KVM_HANDLER BOOKE_INTERRUPT_ITLB_MISS +KVM_HANDLER BOOKE_INTERRUPT_DEBUG + +_GLOBAL(kvmppc_handler_len) + .long kvmppc_handler_1 - kvmppc_handler_0 + + +/* Registers: + * SPRG0: guest r4 + * r4: vcpu pointer + * r5: KVM exit number + */ +_GLOBAL(kvmppc_resume_host) + stw r3, VCPU_GPR(r3)(r4) + mfcr r3 + stw r3, VCPU_CR(r4) + stw r7, VCPU_GPR(r7)(r4) + stw r8, VCPU_GPR(r8)(r4) + stw r9, VCPU_GPR(r9)(r4) + + li r6, 1 + slw r6, r6, r5 + + /* Save the faulting instruction and all GPRs for emulation. */ + andi. r7, r6, NEED_INST_MASK + beq ..skip_inst_copy + mfspr r9, SPRN_SRR0 + mfmsr r8 + ori r7, r8, MSR_DS + mtmsr r7 + isync + lwz r9, 0(r9) + mtmsr r8 + isync + stw r9, VCPU_LAST_INST(r4) + + stw r15, VCPU_GPR(r15)(r4) + stw r16, VCPU_GPR(r16)(r4) + stw r17, VCPU_GPR(r17)(r4) + stw r18, VCPU_GPR(r18)(r4) + stw r19, VCPU_GPR(r19)(r4) + stw r20, VCPU_GPR(r20)(r4) + stw r21, VCPU_GPR(r21)(r4) + stw r22, VCPU_GPR(r22)(r4) + stw r23, VCPU_GPR(r23)(r4) + stw r24, VCPU_GPR(r24)(r4) + stw r25, VCPU_GPR(r25)(r4) + stw r26, VCPU_GPR(r26)(r4) + stw r27, VCPU_GPR(r27)(r4) + stw r28, VCPU_GPR(r28)(r4) + stw r29, VCPU_GPR(r29)(r4) + stw r30, VCPU_GPR(r30)(r4) + stw r31, VCPU_GPR(r31)(r4) +..skip_inst_copy: + + /* Also grab DEAR and ESR before the host can clobber them. */ + + andi. r7, r6, NEED_DEAR_MASK + beq ..skip_dear + mfspr r9, SPRN_DEAR + stw r9, VCPU_FAULT_DEAR(r4) +..skip_dear: + + andi. r7, r6, NEED_ESR_MASK + beq ..skip_esr + mfspr r9, SPRN_ESR + stw r9, VCPU_FAULT_ESR(r4) +..skip_esr: + + /* Save remaining volatile guest register state to vcpu. */ + stw r0, VCPU_GPR(r0)(r4) + stw r1, VCPU_GPR(r1)(r4) + stw r2, VCPU_GPR(r2)(r4) + stw r10, VCPU_GPR(r10)(r4) + stw r11, VCPU_GPR(r11)(r4) + stw r12, VCPU_GPR(r12)(r4) + stw r13, VCPU_GPR(r13)(r4) + stw r14, VCPU_GPR(r14)(r4) /* We need a NV GPR below. */ + mflr r3 + stw r3, VCPU_LR(r4) + mfxer r3 + stw r3, VCPU_XER(r4) + mfspr r3, SPRN_SPRG0 + stw r3, VCPU_GPR(r4)(r4) + mfspr r3, SPRN_SRR0 + stw r3, VCPU_PC(r4) + + /* Restore host stack pointer and PID before IVPR, since the host + * exception handlers use them. */ + lwz r1, VCPU_HOST_STACK(r4) + lwz r3, VCPU_HOST_PID(r4) + mtspr SPRN_PID, r3 + + /* Restore host IVPR before re-enabling interrupts. We cheat and know + * that Linux IVPR is always 0xc0000000. */ + lis r3, 0xc000 + mtspr SPRN_IVPR, r3 + + /* Switch to kernel stack and jump to handler. */ + LOAD_REG_ADDR(r3, kvmppc_handle_exit) + mtctr r3 + lwz r3, HOST_RUN(r1) + lwz r2, HOST_R2(r1) + mr r14, r4 /* Save vcpu pointer. */ + + bctrl /* kvmppc_handle_exit() */ + + /* Restore vcpu pointer and the nonvolatiles we used. */ + mr r4, r14 + lwz r14, VCPU_GPR(r14)(r4) + + /* Sometimes instruction emulation must restore complete GPR state. */ + andi. r5, r3, RESUME_FLAG_NV + beq ..skip_nv_load + lwz r15, VCPU_GPR(r15)(r4) + lwz r16, VCPU_GPR(r16)(r4) + lwz r17, VCPU_GPR(r17)(r4) + lwz r18, VCPU_GPR(r18)(r4) + lwz r19, VCPU_GPR(r19)(r4) + lwz r20, VCPU_GPR(r20)(r4) + lwz r21, VCPU_GPR(r21)(r4) + lwz r22, VCPU_GPR(r22)(r4) + lwz r23, VCPU_GPR(r23)(r4) + lwz r24, VCPU_GPR(r24)(r4) + lwz r25, VCPU_GPR(r25)(r4) + lwz r26, VCPU_GPR(r26)(r4) + lwz r27, VCPU_GPR(r27)(r4) + lwz r28, VCPU_GPR(r28)(r4) + lwz r29, VCPU_GPR(r29)(r4) + lwz r30, VCPU_GPR(r30)(r4) + lwz r31, VCPU_GPR(r31)(r4) +..skip_nv_load: + + /* Should we return to the guest? */ + andi. r5, r3, RESUME_FLAG_HOST + beq lightweight_exit + + srawi r3, r3, 2 /* Shift -ERR back down. */ + +heavyweight_exit: + /* Not returning to guest. */ + + /* We already saved guest volatile register state; now save the + * non-volatiles. */ + stw r15, VCPU_GPR(r15)(r4) + stw r16, VCPU_GPR(r16)(r4) + stw r17, VCPU_GPR(r17)(r4) + stw r18, VCPU_GPR(r18)(r4) + stw r19, VCPU_GPR(r19)(r4) + stw r20, VCPU_GPR(r20)(r4) + stw r21, VCPU_GPR(r21)(r4) + stw r22, VCPU_GPR(r22)(r4) + stw r23, VCPU_GPR(r23)(r4) + stw r24, VCPU_GPR(r24)(r4) + stw r25, VCPU_GPR(r25)(r4) + stw r26, VCPU_GPR(r26)(r4) + stw r27, VCPU_GPR(r27)(r4) + stw r28, VCPU_GPR(r28)(r4) + stw r29, VCPU_GPR(r29)(r4) + stw r30, VCPU_GPR(r30)(r4) + stw r31, VCPU_GPR(r31)(r4) + + /* Load host non-volatile register state from host stack. */ + lwz r14, HOST_NV_GPR(r14)(r1) + lwz r15, HOST_NV_GPR(r15)(r1) + lwz r16, HOST_NV_GPR(r16)(r1) + lwz r17, HOST_NV_GPR(r17)(r1) + lwz r18, HOST_NV_GPR(r18)(r1) + lwz r19, HOST_NV_GPR(r19)(r1) + lwz r20, HOST_NV_GPR(r20)(r1) + lwz r21, HOST_NV_GPR(r21)(r1) + lwz r22, HOST_NV_GPR(r22)(r1) + lwz r23, HOST_NV_GPR(r23)(r1) + lwz r24, HOST_NV_GPR(r24)(r1) + lwz r25, HOST_NV_GPR(r25)(r1) + lwz r26, HOST_NV_GPR(r26)(r1) + lwz r27, HOST_NV_GPR(r27)(r1) + lwz r28, HOST_NV_GPR(r28)(r1) + lwz r29, HOST_NV_GPR(r29)(r1) + lwz r30, HOST_NV_GPR(r30)(r1) + lwz r31, HOST_NV_GPR(r31)(r1) + + /* Return to kvm_vcpu_run(). */ + lwz r4, HOST_STACK_LR(r1) + addi r1, r1, HOST_STACK_SIZE + mtlr r4 + /* r3 still contains the return code from kvmppc_handle_exit(). */ + blr + + +/* Registers: + * r3: kvm_run pointer + * r4: vcpu pointer + */ +_GLOBAL(__kvmppc_vcpu_run) + stwu r1, -HOST_STACK_SIZE(r1) + stw r1, VCPU_HOST_STACK(r4) /* Save stack pointer to vcpu. */ + + /* Save host state to stack. */ + stw r3, HOST_RUN(r1) + mflr r3 + stw r3, HOST_STACK_LR(r1) + + /* Save host non-volatile register state to stack. */ + stw r14, HOST_NV_GPR(r14)(r1) + stw r15, HOST_NV_GPR(r15)(r1) + stw r16, HOST_NV_GPR(r16)(r1) + stw r17, HOST_NV_GPR(r17)(r1) + stw r18, HOST_NV_GPR(r18)(r1) + stw r19, HOST_NV_GPR(r19)(r1) + stw r20, HOST_NV_GPR(r20)(r1) + stw r21, HOST_NV_GPR(r21)(r1) + stw r22, HOST_NV_GPR(r22)(r1) + stw r23, HOST_NV_GPR(r23)(r1) + stw r24, HOST_NV_GPR(r24)(r1) + stw r25, HOST_NV_GPR(r25)(r1) + stw r26, HOST_NV_GPR(r26)(r1) + stw r27, HOST_NV_GPR(r27)(r1) + stw r28, HOST_NV_GPR(r28)(r1) + stw r29, HOST_NV_GPR(r29)(r1) + stw r30, HOST_NV_GPR(r30)(r1) + stw r31, HOST_NV_GPR(r31)(r1) + + /* Load guest non-volatiles. */ + lwz r14, VCPU_GPR(r14)(r4) + lwz r15, VCPU_GPR(r15)(r4) + lwz r16, VCPU_GPR(r16)(r4) + lwz r17, VCPU_GPR(r17)(r4) + lwz r18, VCPU_GPR(r18)(r4) + lwz r19, VCPU_GPR(r19)(r4) + lwz r20, VCPU_GPR(r20)(r4) + lwz r21, VCPU_GPR(r21)(r4) + lwz r22, VCPU_GPR(r22)(r4) + lwz r23, VCPU_GPR(r23)(r4) + lwz r24, VCPU_GPR(r24)(r4) + lwz r25, VCPU_GPR(r25)(r4) + lwz r26, VCPU_GPR(r26)(r4) + lwz r27, VCPU_GPR(r27)(r4) + lwz r28, VCPU_GPR(r28)(r4) + lwz r29, VCPU_GPR(r29)(r4) + lwz r30, VCPU_GPR(r30)(r4) + lwz r31, VCPU_GPR(r31)(r4) + +lightweight_exit: + stw r2, HOST_R2(r1) + + mfspr r3, SPRN_PID + stw r3, VCPU_HOST_PID(r4) + lwz r3, VCPU_PID(r4) + mtspr SPRN_PID, r3 + + /* Prevent all TLB updates. */ + mfmsr r5 + lis r6, (MSR_EE|MSR_CE|MSR_ME|MSR_DE)@h + ori r6, r6, (MSR_EE|MSR_CE|MSR_ME|MSR_DE)@l + andc r6, r5, r6 + mtmsr r6 + + /* Save the host's non-pinned TLB mappings, and load the guest mappings + * over them. Leave the host's "pinned" kernel mappings in place. */ + /* XXX optimization: use generation count to avoid swapping unmodified + * entries. */ + mfspr r10, SPRN_MMUCR /* Save host MMUCR. */ + lis r8, tlb_44x_hwater@ha + lwz r8, tlb_44x_hwater@l(r8) + addi r3, r4, VCPU_HOST_TLB - 4 + addi r9, r4, VCPU_SHADOW_TLB - 4 + li r6, 0 +1: + /* Save host entry. */ + tlbre r7, r6, PPC44x_TLB_PAGEID + mfspr r5, SPRN_MMUCR + stwu r5, 4(r3) + stwu r7, 4(r3) + tlbre r7, r6, PPC44x_TLB_XLAT + stwu r7, 4(r3) + tlbre r7, r6, PPC44x_TLB_ATTRIB + stwu r7, 4(r3) + /* Load guest entry. */ + lwzu r7, 4(r9) + mtspr SPRN_MMUCR, r7 + lwzu r7, 4(r9) + tlbwe r7, r6, PPC44x_TLB_PAGEID + lwzu r7, 4(r9) + tlbwe r7, r6, PPC44x_TLB_XLAT + lwzu r7, 4(r9) + tlbwe r7, r6, PPC44x_TLB_ATTRIB + /* Increment index. */ + addi r6, r6, 1 + cmpw r6, r8 + blt 1b + mtspr SPRN_MMUCR, r10 /* Restore host MMUCR. */ + + iccci 0, 0 /* XXX hack */ + + /* Load some guest volatiles. */ + lwz r0, VCPU_GPR(r0)(r4) + lwz r2, VCPU_GPR(r2)(r4) + lwz r9, VCPU_GPR(r9)(r4) + lwz r10, VCPU_GPR(r10)(r4) + lwz r11, VCPU_GPR(r11)(r4) + lwz r12, VCPU_GPR(r12)(r4) + lwz r13, VCPU_GPR(r13)(r4) + lwz r3, VCPU_LR(r4) + mtlr r3 + lwz r3, VCPU_XER(r4) + mtxer r3 + + /* Switch the IVPR. XXX If we take a TLB miss after this we're screwed, + * so how do we make sure vcpu won't fault? */ + lis r8, kvmppc_booke_handlers@ha + lwz r8, kvmppc_booke_handlers@l(r8) + mtspr SPRN_IVPR, r8 + + /* Save vcpu pointer for the exception handlers. */ + mtspr SPRN_SPRG1, r4 + + /* Can't switch the stack pointer until after IVPR is switched, + * because host interrupt handlers would get confused. */ + lwz r1, VCPU_GPR(r1)(r4) + + /* XXX handle USPRG0 */ + /* Host interrupt handlers may have clobbered these guest-readable + * SPRGs, so we need to reload them here with the guest's values. */ + lwz r3, VCPU_SPRG4(r4) + mtspr SPRN_SPRG4, r3 + lwz r3, VCPU_SPRG5(r4) + mtspr SPRN_SPRG5, r3 + lwz r3, VCPU_SPRG6(r4) + mtspr SPRN_SPRG6, r3 + lwz r3, VCPU_SPRG7(r4) + mtspr SPRN_SPRG7, r3 + + /* Finish loading guest volatiles and jump to guest. */ + lwz r3, VCPU_CTR(r4) + mtctr r3 + lwz r3, VCPU_CR(r4) + mtcr r3 + lwz r5, VCPU_GPR(r5)(r4) + lwz r6, VCPU_GPR(r6)(r4) + lwz r7, VCPU_GPR(r7)(r4) + lwz r8, VCPU_GPR(r8)(r4) + lwz r3, VCPU_PC(r4) + mtsrr0 r3 + lwz r3, VCPU_MSR(r4) + oris r3, r3, KVMPPC_MSR_MASK@h + ori r3, r3, KVMPPC_MSR_MASK@l + mtsrr1 r3 + lwz r3, VCPU_GPR(r3)(r4) + lwz r4, VCPU_GPR(r4)(r4) + rfi diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c new file mode 100644 index 0000000..a03fe0c --- /dev/null +++ b/arch/powerpc/kvm/emulate.c @@ -0,0 +1,760 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright IBM Corp. 2007 + * + * Authors: Hollis Blanchard <hollisb@us.ibm.com> + */ + +#include <linux/jiffies.h> +#include <linux/timer.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/kvm_host.h> + +#include <asm/dcr.h> +#include <asm/dcr-regs.h> +#include <asm/time.h> +#include <asm/byteorder.h> +#include <asm/kvm_ppc.h> + +#include "44x_tlb.h" + +/* Instruction decoding */ +static inline unsigned int get_op(u32 inst) +{ + return inst >> 26; +} + +static inline unsigned int get_xop(u32 inst) +{ + return (inst >> 1) & 0x3ff; +} + +static inline unsigned int get_sprn(u32 inst) +{ + return ((inst >> 16) & 0x1f) | ((inst >> 6) & 0x3e0); +} + +static inline unsigned int get_dcrn(u32 inst) +{ + return ((inst >> 16) & 0x1f) | ((inst >> 6) & 0x3e0); +} + +static inline unsigned int get_rt(u32 inst) +{ + return (inst >> 21) & 0x1f; +} + +static inline unsigned int get_rs(u32 inst) +{ + return (inst >> 21) & 0x1f; +} + +static inline unsigned int get_ra(u32 inst) +{ + return (inst >> 16) & 0x1f; +} + +static inline unsigned int get_rb(u32 inst) +{ + return (inst >> 11) & 0x1f; +} + +static inline unsigned int get_rc(u32 inst) +{ + return inst & 0x1; +} + +static inline unsigned int get_ws(u32 inst) +{ + return (inst >> 11) & 0x1f; +} + +static inline unsigned int get_d(u32 inst) +{ + return inst & 0xffff; +} + +static int tlbe_is_host_safe(const struct kvm_vcpu *vcpu, + const struct tlbe *tlbe) +{ + gpa_t gpa; + + if (!get_tlb_v(tlbe)) + return 0; + + /* Does it match current guest AS? */ + /* XXX what about IS != DS? */ + if (get_tlb_ts(tlbe) != !!(vcpu->arch.msr & MSR_IS)) + return 0; + + gpa = get_tlb_raddr(tlbe); + if (!gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT)) + /* Mapping is not for RAM. */ + return 0; + + return 1; +} + +static int kvmppc_emul_tlbwe(struct kvm_vcpu *vcpu, u32 inst) +{ + u64 eaddr; + u64 raddr; + u64 asid; + u32 flags; + struct tlbe *tlbe; + unsigned int ra; + unsigned int rs; + unsigned int ws; + unsigned int index; + + ra = get_ra(inst); + rs = get_rs(inst); + ws = get_ws(inst); + + index = vcpu->arch.gpr[ra]; + if (index > PPC44x_TLB_SIZE) { + printk("%s: index %d\n", __func__, index); + kvmppc_dump_vcpu(vcpu); + return EMULATE_FAIL; + } + + tlbe = &vcpu->arch.guest_tlb[index]; + + /* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */ + if (tlbe->word0 & PPC44x_TLB_VALID) { + eaddr = get_tlb_eaddr(tlbe); + asid = (tlbe->word0 & PPC44x_TLB_TS) | tlbe->tid; + kvmppc_mmu_invalidate(vcpu, eaddr, asid); + } + + switch (ws) { + case PPC44x_TLB_PAGEID: + tlbe->tid = vcpu->arch.mmucr & 0xff; + tlbe->word0 = vcpu->arch.gpr[rs]; + break; + + case PPC44x_TLB_XLAT: + tlbe->word1 = vcpu->arch.gpr[rs]; + break; + + case PPC44x_TLB_ATTRIB: + tlbe->word2 = vcpu->arch.gpr[rs]; + break; + + default: + return EMULATE_FAIL; + } + + if (tlbe_is_host_safe(vcpu, tlbe)) { + eaddr = get_tlb_eaddr(tlbe); + raddr = get_tlb_raddr(tlbe); + asid = (tlbe->word0 & PPC44x_TLB_TS) | tlbe->tid; + flags = tlbe->word2 & 0xffff; + + /* Create a 4KB mapping on the host. If the guest wanted a + * large page, only the first 4KB is mapped here and the rest + * are mapped on the fly. */ + kvmppc_mmu_map(vcpu, eaddr, raddr >> PAGE_SHIFT, asid, flags); + } + + return EMULATE_DONE; +} + +static void kvmppc_emulate_dec(struct kvm_vcpu *vcpu) +{ + if (vcpu->arch.tcr & TCR_DIE) { + /* The decrementer ticks at the same rate as the timebase, so + * that's how we convert the guest DEC value to the number of + * host ticks. */ + unsigned long nr_jiffies; + + nr_jiffies = vcpu->arch.dec / tb_ticks_per_jiffy; + mod_timer(&vcpu->arch.dec_timer, + get_jiffies_64() + nr_jiffies); + } else { + del_timer(&vcpu->arch.dec_timer); + } +} + +static void kvmppc_emul_rfi(struct kvm_vcpu *vcpu) +{ + vcpu->arch.pc = vcpu->arch.srr0; + kvmppc_set_msr(vcpu, vcpu->arch.srr1); +} + +/* XXX to do: + * lhax + * lhaux + * lswx + * lswi + * stswx + * stswi + * lha + * lhau + * lmw + * stmw + * + * XXX is_bigendian should depend on MMU mapping or MSR[LE] + */ +int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu) +{ + u32 inst = vcpu->arch.last_inst; + u32 ea; + int ra; + int rb; + int rc; + int rs; + int rt; + int sprn; + int dcrn; + enum emulation_result emulated = EMULATE_DONE; + int advance = 1; + + switch (get_op(inst)) { + case 3: /* trap */ + printk("trap!\n"); + kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM); + advance = 0; + break; + + case 19: + switch (get_xop(inst)) { + case 50: /* rfi */ + kvmppc_emul_rfi(vcpu); + advance = 0; + break; + + default: + emulated = EMULATE_FAIL; + break; + } + break; + + case 31: + switch (get_xop(inst)) { + + case 83: /* mfmsr */ + rt = get_rt(inst); + vcpu->arch.gpr[rt] = vcpu->arch.msr; + break; + + case 87: /* lbzx */ + rt = get_rt(inst); + emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1); + break; + + case 131: /* wrtee */ + rs = get_rs(inst); + vcpu->arch.msr = (vcpu->arch.msr & ~MSR_EE) + | (vcpu->arch.gpr[rs] & MSR_EE); + break; + + case 146: /* mtmsr */ + rs = get_rs(inst); + kvmppc_set_msr(vcpu, vcpu->arch.gpr[rs]); + break; + + case 163: /* wrteei */ + vcpu->arch.msr = (vcpu->arch.msr & ~MSR_EE) + | (inst & MSR_EE); + break; + + case 215: /* stbx */ + rs = get_rs(inst); + emulated = kvmppc_handle_store(run, vcpu, + vcpu->arch.gpr[rs], + 1, 1); + break; + + case 247: /* stbux */ + rs = get_rs(inst); + ra = get_ra(inst); + rb = get_rb(inst); + + ea = vcpu->arch.gpr[rb]; + if (ra) + ea += vcpu->arch.gpr[ra]; + + emulated = kvmppc_handle_store(run, vcpu, + vcpu->arch.gpr[rs], + 1, 1); + vcpu->arch.gpr[rs] = ea; + break; + + case 279: /* lhzx */ + rt = get_rt(inst); + emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1); + break; + + case 311: /* lhzux */ + rt = get_rt(inst); + ra = get_ra(inst); + rb = get_rb(inst); + + ea = vcpu->arch.gpr[rb]; + if (ra) + ea += vcpu->arch.gpr[ra]; + + emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1); + vcpu->arch.gpr[ra] = ea; + break; + + case 323: /* mfdcr */ + dcrn = get_dcrn(inst); + rt = get_rt(inst); + + /* The guest may access CPR0 registers to determine the timebase + * frequency, and it must know the real host frequency because it + * can directly access the timebase registers. + * + * It would be possible to emulate those accesses in userspace, + * but userspace can really only figure out the end frequency. + * We could decompose that into the factors that compute it, but + * that's tricky math, and it's easier to just report the real + * CPR0 values. + */ + switch (dcrn) { + case DCRN_CPR0_CONFIG_ADDR: + vcpu->arch.gpr[rt] = vcpu->arch.cpr0_cfgaddr; + break; + case DCRN_CPR0_CONFIG_DATA: + local_irq_disable(); + mtdcr(DCRN_CPR0_CONFIG_ADDR, + vcpu->arch.cpr0_cfgaddr); + vcpu->arch.gpr[rt] = mfdcr(DCRN_CPR0_CONFIG_DATA); + local_irq_enable(); + break; + default: + run->dcr.dcrn = dcrn; + run->dcr.data = 0; + run->dcr.is_write = 0; + vcpu->arch.io_gpr = rt; + vcpu->arch.dcr_needed = 1; + emulated = EMULATE_DO_DCR; + } + + break; + + case 339: /* mfspr */ + sprn = get_sprn(inst); + rt = get_rt(inst); + + switch (sprn) { + case SPRN_SRR0: + vcpu->arch.gpr[rt] = vcpu->arch.srr0; break; + case SPRN_SRR1: + vcpu->arch.gpr[rt] = vcpu->arch.srr1; break; + case SPRN_MMUCR: + vcpu->arch.gpr[rt] = vcpu->arch.mmucr; break; + case SPRN_PID: + vcpu->arch.gpr[rt] = vcpu->arch.pid; break; + case SPRN_IVPR: + vcpu->arch.gpr[rt] = vcpu->arch.ivpr; break; + case SPRN_CCR0: + vcpu->arch.gpr[rt] = vcpu->arch.ccr0; break; + case SPRN_CCR1: + vcpu->arch.gpr[rt] = vcpu->arch.ccr1; break; + case SPRN_PVR: + vcpu->arch.gpr[rt] = vcpu->arch.pvr; break; + case SPRN_DEAR: + vcpu->arch.gpr[rt] = vcpu->arch.dear; break; + case SPRN_ESR: + vcpu->arch.gpr[rt] = vcpu->arch.esr; break; + case SPRN_DBCR0: + vcpu->arch.gpr[rt] = vcpu->arch.dbcr0; break; + case SPRN_DBCR1: + vcpu->arch.gpr[rt] = vcpu->arch.dbcr1; break; + + /* Note: mftb and TBRL/TBWL are user-accessible, so + * the guest can always access the real TB anyways. + * In fact, we probably will never see these traps. */ + case SPRN_TBWL: + vcpu->arch.gpr[rt] = mftbl(); break; + case SPRN_TBWU: + vcpu->arch.gpr[rt] = mftbu(); break; + + case SPRN_SPRG0: + vcpu->arch.gpr[rt] = vcpu->arch.sprg0; break; + case SPRN_SPRG1: + vcpu->arch.gpr[rt] = vcpu->arch.sprg1; break; + case SPRN_SPRG2: + vcpu->arch.gpr[rt] = vcpu->arch.sprg2; break; + case SPRN_SPRG3: + vcpu->arch.gpr[rt] = vcpu->arch.sprg3; break; + /* Note: SPRG4-7 are user-readable, so we don't get + * a trap. */ + + case SPRN_IVOR0: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[0]; break; + case SPRN_IVOR1: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[1]; break; + case SPRN_IVOR2: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[2]; break; + case SPRN_IVOR3: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[3]; break; + case SPRN_IVOR4: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[4]; break; + case SPRN_IVOR5: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[5]; break; + case SPRN_IVOR6: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[6]; break; + case SPRN_IVOR7: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[7]; break; + case SPRN_IVOR8: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[8]; break; + case SPRN_IVOR9: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[9]; break; + case SPRN_IVOR10: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[10]; break; + case SPRN_IVOR11: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[11]; break; + case SPRN_IVOR12: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[12]; break; + case SPRN_IVOR13: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[13]; break; + case SPRN_IVOR14: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[14]; break; + case SPRN_IVOR15: + vcpu->arch.gpr[rt] = vcpu->arch.ivor[15]; break; + + default: + printk("mfspr: unknown spr %x\n", sprn); + vcpu->arch.gpr[rt] = 0; + break; + } + break; + + case 407: /* sthx */ + rs = get_rs(inst); + ra = get_ra(inst); + rb = get_rb(inst); + + emulated = kvmppc_handle_store(run, vcpu, + vcpu->arch.gpr[rs], + 2, 1); + break; + + case 439: /* sthux */ + rs = get_rs(inst); + ra = get_ra(inst); + rb = get_rb(inst); + + ea = vcpu->arch.gpr[rb]; + if (ra) + ea += vcpu->arch.gpr[ra]; + + emulated = kvmppc_handle_store(run, vcpu, + vcpu->arch.gpr[rs], + 2, 1); + vcpu->arch.gpr[ra] = ea; + break; + + case 451: /* mtdcr */ + dcrn = get_dcrn(inst); + rs = get_rs(inst); + + /* emulate some access in kernel */ + switch (dcrn) { + case DCRN_CPR0_CONFIG_ADDR: + vcpu->arch.cpr0_cfgaddr = vcpu->arch.gpr[rs]; + break; + default: + run->dcr.dcrn = dcrn; + run->dcr.data = vcpu->arch.gpr[rs]; + run->dcr.is_write = 1; + vcpu->arch.dcr_needed = 1; + emulated = EMULATE_DO_DCR; + } + + break; + + case 467: /* mtspr */ + sprn = get_sprn(inst); + rs = get_rs(inst); + switch (sprn) { + case SPRN_SRR0: + vcpu->arch.srr0 = vcpu->arch.gpr[rs]; break; + case SPRN_SRR1: + vcpu->arch.srr1 = vcpu->arch.gpr[rs]; break; + case SPRN_MMUCR: + vcpu->arch.mmucr = vcpu->arch.gpr[rs]; break; + case SPRN_PID: + vcpu->arch.pid = vcpu->arch.gpr[rs]; break; + case SPRN_CCR0: + vcpu->arch.ccr0 = vcpu->arch.gpr[rs]; break; + case SPRN_CCR1: + vcpu->arch.ccr1 = vcpu->arch.gpr[rs]; break; + case SPRN_DEAR: + vcpu->arch.dear = vcpu->arch.gpr[rs]; break; + case SPRN_ESR: + vcpu->arch.esr = vcpu->arch.gpr[rs]; break; + case SPRN_DBCR0: + vcpu->arch.dbcr0 = vcpu->arch.gpr[rs]; break; + case SPRN_DBCR1: + vcpu->arch.dbcr1 = vcpu->arch.gpr[rs]; break; + + /* XXX We need to context-switch the timebase for + * watchdog and FIT. */ + case SPRN_TBWL: break; + case SPRN_TBWU: break; + + case SPRN_DEC: + vcpu->arch.dec = vcpu->arch.gpr[rs]; + kvmppc_emulate_dec(vcpu); + break; + + case SPRN_TSR: + vcpu->arch.tsr &= ~vcpu->arch.gpr[rs]; break; + + case SPRN_TCR: + vcpu->arch.tcr = vcpu->arch.gpr[rs]; + kvmppc_emulate_dec(vcpu); + break; + + case SPRN_SPRG0: + vcpu->arch.sprg0 = vcpu->arch.gpr[rs]; break; + case SPRN_SPRG1: + vcpu->arch.sprg1 = vcpu->arch.gpr[rs]; break; + case SPRN_SPRG2: + vcpu->arch.sprg2 = vcpu->arch.gpr[rs]; break; + case SPRN_SPRG3: + vcpu->arch.sprg3 = vcpu->arch.gpr[rs]; break; + + /* Note: SPRG4-7 are user-readable. These values are + * loaded into the real SPRGs when resuming the + * guest. */ + case SPRN_SPRG4: + vcpu->arch.sprg4 = vcpu->arch.gpr[rs]; break; + case SPRN_SPRG5: + vcpu->arch.sprg5 = vcpu->arch.gpr[rs]; break; + case SPRN_SPRG6: + vcpu->arch.sprg6 = vcpu->arch.gpr[rs]; break; + case SPRN_SPRG7: + vcpu->arch.sprg7 = vcpu->arch.gpr[rs]; break; + + case SPRN_IVPR: + vcpu->arch.ivpr = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR0: + vcpu->arch.ivor[0] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR1: + vcpu->arch.ivor[1] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR2: + vcpu->arch.ivor[2] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR3: + vcpu->arch.ivor[3] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR4: + vcpu->arch.ivor[4] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR5: + vcpu->arch.ivor[5] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR6: + vcpu->arch.ivor[6] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR7: + vcpu->arch.ivor[7] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR8: + vcpu->arch.ivor[8] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR9: + vcpu->arch.ivor[9] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR10: + vcpu->arch.ivor[10] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR11: + vcpu->arch.ivor[11] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR12: + vcpu->arch.ivor[12] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR13: + vcpu->arch.ivor[13] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR14: + vcpu->arch.ivor[14] = vcpu->arch.gpr[rs]; break; + case SPRN_IVOR15: + vcpu->arch.ivor[15] = vcpu->arch.gpr[rs]; break; + + default: + printk("mtspr: unknown spr %x\n", sprn); + emulated = EMULATE_FAIL; + break; + } + break; + + case 470: /* dcbi */ + /* Do nothing. The guest is performing dcbi because + * hardware DMA is not snooped by the dcache, but + * emulated DMA either goes through the dcache as + * normal writes, or the host kernel has handled dcache + * coherence. */ + break; + + case 534: /* lwbrx */ + rt = get_rt(inst); + emulated = kvmppc_handle_load(run, vcpu, rt, 4, 0); + break; + + case 566: /* tlbsync */ + break; + + case 662: /* stwbrx */ + rs = get_rs(inst); + ra = get_ra(inst); + rb = get_rb(inst); + + emulated = kvmppc_handle_store(run, vcpu, + vcpu->arch.gpr[rs], + 4, 0); + break; + + case 978: /* tlbwe */ + emulated = kvmppc_emul_tlbwe(vcpu, inst); + break; + + case 914: { /* tlbsx */ + int index; + unsigned int as = get_mmucr_sts(vcpu); + unsigned int pid = get_mmucr_stid(vcpu); + + rt = get_rt(inst); + ra = get_ra(inst); + rb = get_rb(inst); + rc = get_rc(inst); + + ea = vcpu->arch.gpr[rb]; + if (ra) + ea += vcpu->arch.gpr[ra]; + + index = kvmppc_44x_tlb_index(vcpu, ea, pid, as); + if (rc) { + if (index < 0) + vcpu->arch.cr &= ~0x20000000; + else + vcpu->arch.cr |= 0x20000000; + } + vcpu->arch.gpr[rt] = index; + + } + break; + + case 790: /* lhbrx */ + rt = get_rt(inst); + emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0); + break; + + case 918: /* sthbrx */ + rs = get_rs(inst); + ra = get_ra(inst); + rb = get_rb(inst); + + emulated = kvmppc_handle_store(run, vcpu, + vcpu->arch.gpr[rs], + 2, 0); + break; + + case 966: /* iccci */ + break; + + default: + printk("unknown: op %d xop %d\n", get_op(inst), + get_xop(inst)); + emulated = EMULATE_FAIL; + break; + } + break; + + case 32: /* lwz */ + rt = get_rt(inst); + emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1); + break; + + case 33: /* lwzu */ + ra = get_ra(inst); + rt = get_rt(inst); + emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1); + vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed; + break; + + case 34: /* lbz */ + rt = get_rt(inst); + emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1); + break; + + case 35: /* lbzu */ + ra = get_ra(inst); + rt = get_rt(inst); + emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1); + vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed; + break; + + case 36: /* stw */ + rs = get_rs(inst); + emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs], + 4, 1); + break; + + case 37: /* stwu */ + ra = get_ra(inst); + rs = get_rs(inst); + emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs], + 4, 1); + vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed; + break; + + case 38: /* stb */ + rs = get_rs(inst); + emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs], + 1, 1); + break; + + case 39: /* stbu */ + ra = get_ra(inst); + rs = get_rs(inst); + emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs], + 1, 1); + vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed; + break; + + case 40: /* lhz */ + rt = get_rt(inst); + emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1); + break; + + case 41: /* lhzu */ + ra = get_ra(inst); + rt = get_rt(inst); + emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1); + vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed; + break; + + case 44: /* sth */ + rs = get_rs(inst); + emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs], + 2, 1); + break; + + case 45: /* sthu */ + ra = get_ra(inst); + rs = get_rs(inst); + emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs], + 2, 1); + vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed; + break; + + default: + printk("unknown op %d\n", get_op(inst)); + emulated = EMULATE_FAIL; + break; + } + + if (advance) + vcpu->arch.pc += 4; /* Advance past emulated instruction. */ + + return emulated; +} diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c new file mode 100644 index 0000000..bad40bd --- /dev/null +++ b/arch/powerpc/kvm/powerpc.c @@ -0,0 +1,436 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright IBM Corp. 2007 + * + * Authors: Hollis Blanchard <hollisb@us.ibm.com> + * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> + */ + +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/kvm_host.h> +#include <linux/module.h> +#include <linux/vmalloc.h> +#include <linux/fs.h> +#include <asm/cputable.h> +#include <asm/uaccess.h> +#include <asm/kvm_ppc.h> + + +gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn) +{ + return gfn; +} + +int kvm_cpu_has_interrupt(struct kvm_vcpu *v) +{ + /* XXX implement me */ + return 0; +} + +int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) +{ + return 1; +} + + +int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu) +{ + enum emulation_result er; + int r; + + er = kvmppc_emulate_instruction(run, vcpu); + switch (er) { + case EMULATE_DONE: + /* Future optimization: only reload non-volatiles if they were + * actually modified. */ + r = RESUME_GUEST_NV; + break; + case EMULATE_DO_MMIO: + run->exit_reason = KVM_EXIT_MMIO; + /* We must reload nonvolatiles because "update" load/store + * instructions modify register state. */ + /* Future optimization: only reload non-volatiles if they were + * actually modified. */ + r = RESUME_HOST_NV; + break; + case EMULATE_FAIL: + /* XXX Deliver Program interrupt to guest. */ + printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__, + vcpu->arch.last_inst); + r = RESUME_HOST; + break; + default: + BUG(); + } + + return r; +} + +void kvm_arch_hardware_enable(void *garbage) +{ +} + +void kvm_arch_hardware_disable(void *garbage) +{ +} + +int kvm_arch_hardware_setup(void) +{ + return 0; +} + +void kvm_arch_hardware_unsetup(void) +{ +} + +void kvm_arch_check_processor_compat(void *rtn) +{ + int r; + + if (strcmp(cur_cpu_spec->platform, "ppc440") == 0) + r = 0; + else + r = -ENOTSUPP; + + *(int *)rtn = r; +} + +struct kvm *kvm_arch_create_vm(void) +{ + struct kvm *kvm; + + kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL); + if (!kvm) + return ERR_PTR(-ENOMEM); + + return kvm; +} + +static void kvmppc_free_vcpus(struct kvm *kvm) +{ + unsigned int i; + + for (i = 0; i < KVM_MAX_VCPUS; ++i) { + if (kvm->vcpus[i]) { + kvm_arch_vcpu_free(kvm->vcpus[i]); + kvm->vcpus[i] = NULL; + } + } +} + +void kvm_arch_destroy_vm(struct kvm *kvm) +{ + kvmppc_free_vcpus(kvm); + kvm_free_physmem(kvm); + kfree(kvm); +} + +int kvm_dev_ioctl_check_extension(long ext) +{ + int r; + + switch (ext) { + case KVM_CAP_USER_MEMORY: + r = 1; + break; + default: + r = 0; + break; + } + return r; + +} + +long kvm_arch_dev_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + return -EINVAL; +} + +int kvm_arch_set_memory_region(struct kvm *kvm, + struct kvm_userspace_memory_region *mem, + struct kvm_memory_slot old, + int user_alloc) +{ + return 0; +} + +struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) +{ + struct kvm_vcpu *vcpu; + int err; + + vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); + if (!vcpu) { + err = -ENOMEM; + goto out; + } + + err = kvm_vcpu_init(vcpu, kvm, id); + if (err) + goto free_vcpu; + + return vcpu; + +free_vcpu: + kmem_cache_free(kvm_vcpu_cache, vcpu); +out: + return ERR_PTR(err); +} + +void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) +{ + kvm_vcpu_uninit(vcpu); + kmem_cache_free(kvm_vcpu_cache, vcpu); +} + +void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) +{ + kvm_arch_vcpu_free(vcpu); +} + +int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) +{ + unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER]; + + return test_bit(priority, &vcpu->arch.pending_exceptions); +} + +static void kvmppc_decrementer_func(unsigned long data) +{ + struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; + + kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER); +} + +int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) +{ + setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func, + (unsigned long)vcpu); + + return 0; +} + +void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) +{ +} + +void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) +{ +} + +void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) +{ +} + +void decache_vcpus_on_cpu(int cpu) +{ +} + +int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu, + struct kvm_debug_guest *dbg) +{ + return -ENOTSUPP; +} + +static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu, + struct kvm_run *run) +{ + u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr]; + *gpr = run->dcr.data; +} + +static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu, + struct kvm_run *run) +{ + u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr]; + + if (run->mmio.len > sizeof(*gpr)) { + printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len); + return; + } + + if (vcpu->arch.mmio_is_bigendian) { + switch (run->mmio.len) { + case 4: *gpr = *(u32 *)run->mmio.data; break; + case 2: *gpr = *(u16 *)run->mmio.data; break; + case 1: *gpr = *(u8 *)run->mmio.data; break; + } + } else { + /* Convert BE data from userland back to LE. */ + switch (run->mmio.len) { + case 4: *gpr = ld_le32((u32 *)run->mmio.data); break; + case 2: *gpr = ld_le16((u16 *)run->mmio.data); break; + case 1: *gpr = *(u8 *)run->mmio.data; break; + } + } +} + +int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu, + unsigned int rt, unsigned int bytes, int is_bigendian) +{ + if (bytes > sizeof(run->mmio.data)) { + printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__, + run->mmio.len); + } + + run->mmio.phys_addr = vcpu->arch.paddr_accessed; + run->mmio.len = bytes; + run->mmio.is_write = 0; + + vcpu->arch.io_gpr = rt; + vcpu->arch.mmio_is_bigendian = is_bigendian; + vcpu->mmio_needed = 1; + vcpu->mmio_is_write = 0; + + return EMULATE_DO_MMIO; +} + +int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu, + u32 val, unsigned int bytes, int is_bigendian) +{ + void *data = run->mmio.data; + + if (bytes > sizeof(run->mmio.data)) { + printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__, + run->mmio.len); + } + + run->mmio.phys_addr = vcpu->arch.paddr_accessed; + run->mmio.len = bytes; + run->mmio.is_write = 1; + vcpu->mmio_needed = 1; + vcpu->mmio_is_write = 1; + + /* Store the value at the lowest bytes in 'data'. */ + if (is_bigendian) { + switch (bytes) { + case 4: *(u32 *)data = val; break; + case 2: *(u16 *)data = val; break; + case 1: *(u8 *)data = val; break; + } + } else { + /* Store LE value into 'data'. */ + switch (bytes) { + case 4: st_le32(data, val); break; + case 2: st_le16(data, val); break; + case 1: *(u8 *)data = val; break; + } + } + + return EMULATE_DO_MMIO; +} + +int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + int r; + sigset_t sigsaved; + + if (vcpu->sigset_active) + sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); + + if (vcpu->mmio_needed) { + if (!vcpu->mmio_is_write) + kvmppc_complete_mmio_load(vcpu, run); + vcpu->mmio_needed = 0; + } else if (vcpu->arch.dcr_needed) { + if (!vcpu->arch.dcr_is_write) + kvmppc_complete_dcr_load(vcpu, run); + vcpu->arch.dcr_needed = 0; + } + + kvmppc_check_and_deliver_interrupts(vcpu); + + local_irq_disable(); + kvm_guest_enter(); + r = __kvmppc_vcpu_run(run, vcpu); + kvm_guest_exit(); + local_irq_enable(); + + if (vcpu->sigset_active) + sigprocmask(SIG_SETMASK, &sigsaved, NULL); + + return r; +} + +int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) +{ + kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL); + return 0; +} + +int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, + struct kvm_mp_state *mp_state) +{ + return -EINVAL; +} + +int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, + struct kvm_mp_state *mp_state) +{ + return -EINVAL; +} + +long kvm_arch_vcpu_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + struct kvm_vcpu *vcpu = filp->private_data; + void __user *argp = (void __user *)arg; + long r; + + switch (ioctl) { + case KVM_INTERRUPT: { + struct kvm_interrupt irq; + r = -EFAULT; + if (copy_from_user(&irq, argp, sizeof(irq))) + goto out; + r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); + break; + } + default: + r = -EINVAL; + } + +out: + return r; +} + +int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) +{ + return -ENOTSUPP; +} + +long kvm_arch_vm_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + long r; + + switch (ioctl) { + default: + r = -EINVAL; + } + + return r; +} + +int kvm_arch_init(void *opaque) +{ + return 0; +} + +void kvm_arch_exit(void) +{ +} diff --git a/include/asm-powerpc/kvm.h b/include/asm-powerpc/kvm.h index d1b530f..f993e41 100644 --- a/include/asm-powerpc/kvm.h +++ b/include/asm-powerpc/kvm.h @@ -1,6 +1,55 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright IBM Corp. 2007 + * + * Authors: Hollis Blanchard <hollisb@us.ibm.com> + */ + #ifndef __LINUX_KVM_POWERPC_H #define __LINUX_KVM_POWERPC_H -/* powerpc does not support KVM */ +#include <asm/types.h> + +struct kvm_regs { + __u64 pc; + __u64 cr; + __u64 ctr; + __u64 lr; + __u64 xer; + __u64 msr; + __u64 srr0; + __u64 srr1; + __u64 pid; + + __u64 sprg0; + __u64 sprg1; + __u64 sprg2; + __u64 sprg3; + __u64 sprg4; + __u64 sprg5; + __u64 sprg6; + __u64 sprg7; + + __u64 gpr[32]; +}; + +struct kvm_sregs { +}; + +struct kvm_fpu { + __u64 fpr[32]; +}; -#endif +#endif /* __LINUX_KVM_POWERPC_H */ diff --git a/include/asm-powerpc/kvm_asm.h b/include/asm-powerpc/kvm_asm.h new file mode 100644 index 0000000..2197764 --- /dev/null +++ b/include/asm-powerpc/kvm_asm.h @@ -0,0 +1,55 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright IBM Corp. 2008 + * + * Authors: Hollis Blanchard <hollisb@us.ibm.com> + */ + +#ifndef __POWERPC_KVM_ASM_H__ +#define __POWERPC_KVM_ASM_H__ + +/* IVPR must be 64KiB-aligned. */ +#define VCPU_SIZE_ORDER 4 +#define VCPU_SIZE_LOG (VCPU_SIZE_ORDER + 12) +#define VCPU_TLB_PGSZ PPC44x_TLB_64K +#define VCPU_SIZE_BYTES (1<<VCPU_SIZE_LOG) + +#define BOOKE_INTERRUPT_CRITICAL 0 +#define BOOKE_INTERRUPT_MACHINE_CHECK 1 +#define BOOKE_INTERRUPT_DATA_STORAGE 2 +#define BOOKE_INTERRUPT_INST_STORAGE 3 +#define BOOKE_INTERRUPT_EXTERNAL 4 +#define BOOKE_INTERRUPT_ALIGNMENT 5 +#define BOOKE_INTERRUPT_PROGRAM 6 +#define BOOKE_INTERRUPT_FP_UNAVAIL 7 +#define BOOKE_INTERRUPT_SYSCALL 8 +#define BOOKE_INTERRUPT_AP_UNAVAIL 9 +#define BOOKE_INTERRUPT_DECREMENTER 10 +#define BOOKE_INTERRUPT_FIT 11 +#define BOOKE_INTERRUPT_WATCHDOG 12 +#define BOOKE_INTERRUPT_DTLB_MISS 13 +#define BOOKE_INTERRUPT_ITLB_MISS 14 +#define BOOKE_INTERRUPT_DEBUG 15 +#define BOOKE_MAX_INTERRUPT 15 + +#define RESUME_FLAG_NV (1<<0) /* Reload guest nonvolatile state? */ +#define RESUME_FLAG_HOST (1<<1) /* Resume host? */ + +#define RESUME_GUEST 0 +#define RESUME_GUEST_NV RESUME_FLAG_NV +#define RESUME_HOST RESUME_FLAG_HOST +#define RESUME_HOST_NV (RESUME_FLAG_HOST|RESUME_FLAG_NV) + +#endif /* __POWERPC_KVM_ASM_H__ */ diff --git a/include/asm-powerpc/kvm_host.h b/include/asm-powerpc/kvm_host.h new file mode 100644 index 0000000..04ffbb8 --- /dev/null +++ b/include/asm-powerpc/kvm_host.h @@ -0,0 +1,152 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright IBM Corp. 2007 + * + * Authors: Hollis Blanchard <hollisb@us.ibm.com> + */ + +#ifndef __POWERPC_KVM_HOST_H__ +#define __POWERPC_KVM_HOST_H__ + +#include <linux/mutex.h> +#include <linux/timer.h> +#include <linux/types.h> +#include <linux/kvm_types.h> +#include <asm/kvm_asm.h> + +#define KVM_MAX_VCPUS 1 +#define KVM_MEMORY_SLOTS 32 +/* memory slots that does not exposed to userspace */ +#define KVM_PRIVATE_MEM_SLOTS 4 + +/* We don't currently support large pages. */ +#define KVM_PAGES_PER_HPAGE (1<<31) + +struct kvm; +struct kvm_run; +struct kvm_vcpu; + +struct kvm_vm_stat { + u32 remote_tlb_flush; +}; + +struct kvm_vcpu_stat { + u32 sum_exits; + u32 mmio_exits; + u32 dcr_exits; + u32 signal_exits; + u32 light_exits; + /* Account for special types of light exits: */ + u32 itlb_real_miss_exits; + u32 itlb_virt_miss_exits; + u32 dtlb_real_miss_exits; + u32 dtlb_virt_miss_exits; + u32 syscall_exits; + u32 isi_exits; + u32 dsi_exits; + u32 emulated_inst_exits; + u32 dec_exits; + u32 ext_intr_exits; +}; + +struct tlbe { + u32 tid; /* Only the low 8 bits are used. */ + u32 word0; + u32 word1; + u32 word2; +}; + +struct kvm_arch { +}; + +struct kvm_vcpu_arch { + /* Unmodified copy of the guest's TLB. */ + struct tlbe guest_tlb[PPC44x_TLB_SIZE]; + /* TLB that's actually used when the guest is running. */ + struct tlbe shadow_tlb[PPC44x_TLB_SIZE]; + /* Pages which are referenced in the shadow TLB. */ + struct page *shadow_pages[PPC44x_TLB_SIZE]; + /* Copy of the host's TLB. */ + struct tlbe host_tlb[PPC44x_TLB_SIZE]; + + u32 host_stack; + u32 host_pid; + + u64 fpr[32]; + u32 gpr[32]; + + u32 pc; + u32 cr; + u32 ctr; + u32 lr; + u32 xer; + + u32 msr; + u32 mmucr; + u32 sprg0; + u32 sprg1; + u32 sprg2; + u32 sprg3; + u32 sprg4; + u32 sprg5; + u32 sprg6; + u32 sprg7; + u32 srr0; + u32 srr1; + u32 csrr0; + u32 csrr1; + u32 dsrr0; + u32 dsrr1; + u32 dear; + u32 esr; + u32 dec; + u32 decar; + u32 tbl; + u32 tbu; + u32 tcr; + u32 tsr; + u32 ivor[16]; + u32 ivpr; + u32 pir; + u32 pid; + u32 pvr; + u32 ccr0; + u32 ccr1; + u32 dbcr0; + u32 dbcr1; + + u32 last_inst; + u32 fault_dear; + u32 fault_esr; + gpa_t paddr_accessed; + + u8 io_gpr; /* GPR used as IO source/target */ + u8 mmio_is_bigendian; + u8 dcr_needed; + u8 dcr_is_write; + + u32 cpr0_cfgaddr; /* holds the last set cpr0_cfgaddr */ + + struct timer_list dec_timer; + unsigned long pending_exceptions; +}; + +struct kvm_guest_debug { + int enabled; + unsigned long bp[4]; + int singlestep; +}; + +#endif /* __POWERPC_KVM_HOST_H__ */ diff --git a/include/asm-powerpc/kvm_para.h b/include/asm-powerpc/kvm_para.h new file mode 100644 index 0000000..2d48f6a --- /dev/null +++ b/include/asm-powerpc/kvm_para.h @@ -0,0 +1,37 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright IBM Corp. 2008 + * + * Authors: Hollis Blanchard <hollisb@us.ibm.com> + */ + +#ifndef __POWERPC_KVM_PARA_H__ +#define __POWERPC_KVM_PARA_H__ + +#ifdef __KERNEL__ + +static inline int kvm_para_available(void) +{ + return 0; +} + +static inline unsigned int kvm_arch_para_features(void) +{ + return 0; +} + +#endif /* __KERNEL__ */ + +#endif /* __POWERPC_KVM_PARA_H__ */ diff --git a/include/asm-powerpc/kvm_ppc.h b/include/asm-powerpc/kvm_ppc.h new file mode 100644 index 0000000..7ac8203 --- /dev/null +++ b/include/asm-powerpc/kvm_ppc.h @@ -0,0 +1,88 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright IBM Corp. 2008 + * + * Authors: Hollis Blanchard <hollisb@us.ibm.com> + */ + +#ifndef __POWERPC_KVM_PPC_H__ +#define __POWERPC_KVM_PPC_H__ + +/* This file exists just so we can dereference kvm_vcpu, avoiding nested header + * dependencies. */ + +#include <linux/mutex.h> +#include <linux/timer.h> +#include <linux/types.h> +#include <linux/kvm_types.h> +#include <linux/kvm_host.h> + +struct kvm_tlb { + struct tlbe guest_tlb[PPC44x_TLB_SIZE]; + struct tlbe shadow_tlb[PPC44x_TLB_SIZE]; +}; + +enum emulation_result { + EMULATE_DONE, /* no further processing */ + EMULATE_DO_MMIO, /* kvm_run filled with MMIO request */ + EMULATE_DO_DCR, /* kvm_run filled with DCR request */ + EMULATE_FAIL, /* can't emulate this instruction */ +}; + +extern const unsigned char exception_priority[]; +extern const unsigned char priority_exception[]; + +extern int __kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu); +extern char kvmppc_handlers_start[]; +extern unsigned long kvmppc_handler_len; + +extern void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu); +extern int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu, + unsigned int rt, unsigned int bytes, + int is_bigendian); +extern int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu, + u32 val, unsigned int bytes, int is_bigendian); + +extern int kvmppc_emulate_instruction(struct kvm_run *run, + struct kvm_vcpu *vcpu); + +extern void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gfn_t gfn, + u64 asid, u32 flags); +extern void kvmppc_mmu_invalidate(struct kvm_vcpu *vcpu, u64 eaddr, u64 asid); +extern void kvmppc_mmu_priv_switch(struct kvm_vcpu *vcpu, int usermode); + +extern void kvmppc_check_and_deliver_interrupts(struct kvm_vcpu *vcpu); + +static inline void kvmppc_queue_exception(struct kvm_vcpu *vcpu, int exception) +{ + unsigned int priority = exception_priority[exception]; + set_bit(priority, &vcpu->arch.pending_exceptions); +} + +static inline void kvmppc_clear_exception(struct kvm_vcpu *vcpu, int exception) +{ + unsigned int priority = exception_priority[exception]; + clear_bit(priority, &vcpu->arch.pending_exceptions); +} + +static inline void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr) +{ + if ((new_msr & MSR_PR) != (vcpu->arch.msr & MSR_PR)) + kvmppc_mmu_priv_switch(vcpu, new_msr & MSR_PR); + + vcpu->arch.msr = new_msr; +} + +#endif /* __POWERPC_KVM_PPC_H__ */ |