diff options
| -rw-r--r-- | arch/x86/kvm/mmu.c | 4 | ||||
| -rw-r--r-- | include/linux/kvm_host.h | 1 | ||||
| -rw-r--r-- | virt/kvm/kvm_main.c | 28 |
3 files changed, 28 insertions, 5 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index d8d4832..89d7a2c 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2078,7 +2078,9 @@ static int kvm_handle_bad_page(struct kvm *kvm, gfn_t gfn, pfn_t pfn) if (is_hwpoison_pfn(pfn)) { kvm_send_hwpoison_signal(kvm, gfn); return 0; - } + } else if (is_fault_pfn(pfn)) + return -EFAULT; + return 1; } diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index e796326..8055067b 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -269,6 +269,7 @@ extern pfn_t bad_pfn; int is_error_page(struct page *page); int is_error_pfn(pfn_t pfn); int is_hwpoison_pfn(pfn_t pfn); +int is_fault_pfn(pfn_t pfn); int kvm_is_error_hva(unsigned long addr); int kvm_set_memory_region(struct kvm *kvm, struct kvm_userspace_memory_region *mem, diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 630d122..b78b794 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -96,6 +96,9 @@ static bool largepages_enabled = true; static struct page *hwpoison_page; static pfn_t hwpoison_pfn; +static struct page *fault_page; +static pfn_t fault_pfn; + inline int kvm_is_mmio_pfn(pfn_t pfn) { if (pfn_valid(pfn)) { @@ -815,13 +818,13 @@ EXPORT_SYMBOL_GPL(kvm_disable_largepages); int is_error_page(struct page *page) { - return page == bad_page || page == hwpoison_page; + return page == bad_page || page == hwpoison_page || page == fault_page; } EXPORT_SYMBOL_GPL(is_error_page); int is_error_pfn(pfn_t pfn) { - return pfn == bad_pfn || pfn == hwpoison_pfn; + return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn; } EXPORT_SYMBOL_GPL(is_error_pfn); @@ -831,6 +834,12 @@ int is_hwpoison_pfn(pfn_t pfn) } EXPORT_SYMBOL_GPL(is_hwpoison_pfn); +int is_fault_pfn(pfn_t pfn) +{ + return pfn == fault_pfn; +} +EXPORT_SYMBOL_GPL(is_fault_pfn); + static inline unsigned long bad_hva(void) { return PAGE_OFFSET; @@ -959,8 +968,8 @@ static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr) if (vma == NULL || addr < vma->vm_start || !(vma->vm_flags & VM_PFNMAP)) { up_read(¤t->mm->mmap_sem); - get_page(bad_page); - return page_to_pfn(bad_page); + get_page(fault_page); + return page_to_pfn(fault_page); } pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; @@ -2226,6 +2235,15 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, hwpoison_pfn = page_to_pfn(hwpoison_page); + fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO); + + if (fault_page == NULL) { + r = -ENOMEM; + goto out_free_0; + } + + fault_pfn = page_to_pfn(fault_page); + if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { r = -ENOMEM; goto out_free_0; @@ -2298,6 +2316,8 @@ out_free_1: out_free_0a: free_cpumask_var(cpus_hardware_enabled); out_free_0: + if (fault_page) + __free_page(fault_page); if (hwpoison_page) __free_page(hwpoison_page); __free_page(bad_page); |