diff options
| -rw-r--r-- | arch/x86/xen/enlighten.c | 30 | ||||
| -rw-r--r-- | arch/x86/xen/mmu.c | 113 | ||||
| -rw-r--r-- | mm/Kconfig | 1 |
3 files changed, 103 insertions, 41 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index e334bf7..4186cb6 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -666,6 +666,15 @@ static __init void xen_alloc_pt_init(struct mm_struct *mm, u32 pfn) make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); } +static void pin_pagetable_pfn(unsigned level, unsigned long pfn) +{ + struct mmuext_op op; + op.cmd = level; + op.arg1.mfn = pfn_to_mfn(pfn); + if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF)) + BUG(); +} + /* This needs to make sure the new pte page is pinned iff its being attached to a pinned pagetable. */ static void xen_alloc_pt(struct mm_struct *mm, u32 pfn) @@ -675,9 +684,10 @@ static void xen_alloc_pt(struct mm_struct *mm, u32 pfn) if (PagePinned(virt_to_page(mm->pgd))) { SetPagePinned(page); - if (!PageHighMem(page)) + if (!PageHighMem(page)) { make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); - else + pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn); + } else /* make sure there are no stray mappings of this page */ kmap_flush_unused(); @@ -690,8 +700,10 @@ static void xen_release_pt(u32 pfn) struct page *page = pfn_to_page(pfn); if (PagePinned(page)) { - if (!PageHighMem(page)) + if (!PageHighMem(page)) { + pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn); make_lowmem_page_readwrite(__va(PFN_PHYS(pfn))); + } } } @@ -806,15 +818,15 @@ static __init void xen_pagetable_setup_done(pgd_t *base) /* Actually pin the pagetable down, but we can't set PG_pinned yet because the page structures don't exist yet. */ { - struct mmuext_op op; + unsigned level; + #ifdef CONFIG_X86_PAE - op.cmd = MMUEXT_PIN_L3_TABLE; + level = MMUEXT_PIN_L3_TABLE; #else - op.cmd = MMUEXT_PIN_L3_TABLE; + level = MMUEXT_PIN_L2_TABLE; #endif - op.arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(base))); - if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF)) - BUG(); + + pin_pagetable_pfn(level, PFN_DOWN(__pa(base))); } } diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index 72f08ab..b2e32f9 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -303,7 +303,12 @@ pgd_t xen_make_pgd(unsigned long pgd) } #endif /* CONFIG_X86_PAE */ - +enum pt_level { + PT_PGD, + PT_PUD, + PT_PMD, + PT_PTE +}; /* (Yet another) pagetable walker. This one is intended for pinning a @@ -315,7 +320,7 @@ pgd_t xen_make_pgd(unsigned long pgd) FIXADDR_TOP. But the important bit is that we don't pin beyond there, because then we start getting into Xen's ptes. */ -static int pgd_walk(pgd_t *pgd_base, int (*func)(struct page *, unsigned), +static int pgd_walk(pgd_t *pgd_base, int (*func)(struct page *, enum pt_level), unsigned long limit) { pgd_t *pgd = pgd_base; @@ -340,7 +345,7 @@ static int pgd_walk(pgd_t *pgd_base, int (*func)(struct page *, unsigned), pud = pud_offset(pgd, 0); if (PTRS_PER_PUD > 1) /* not folded */ - flush |= (*func)(virt_to_page(pud), 0); + flush |= (*func)(virt_to_page(pud), PT_PUD); for (; addr != pud_limit; pud++, addr = pud_next) { pmd_t *pmd; @@ -359,7 +364,7 @@ static int pgd_walk(pgd_t *pgd_base, int (*func)(struct page *, unsigned), pmd = pmd_offset(pud, 0); if (PTRS_PER_PMD > 1) /* not folded */ - flush |= (*func)(virt_to_page(pmd), 0); + flush |= (*func)(virt_to_page(pmd), PT_PMD); for (; addr != pmd_limit; pmd++) { addr += (PAGE_SIZE * PTRS_PER_PTE); @@ -371,17 +376,47 @@ static int pgd_walk(pgd_t *pgd_base, int (*func)(struct page *, unsigned), if (pmd_none(*pmd)) continue; - flush |= (*func)(pmd_page(*pmd), 0); + flush |= (*func)(pmd_page(*pmd), PT_PTE); } } } - flush |= (*func)(virt_to_page(pgd_base), UVMF_TLB_FLUSH); + flush |= (*func)(virt_to_page(pgd_base), PT_PGD); return flush; } -static int pin_page(struct page *page, unsigned flags) +static spinlock_t *lock_pte(struct page *page) +{ + spinlock_t *ptl = NULL; + +#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS + ptl = __pte_lockptr(page); + spin_lock(ptl); +#endif + + return ptl; +} + +static void do_unlock(void *v) +{ + spinlock_t *ptl = v; + spin_unlock(ptl); +} + +static void xen_do_pin(unsigned level, unsigned long pfn) +{ + struct mmuext_op *op; + struct multicall_space mcs; + + mcs = __xen_mc_entry(sizeof(*op)); + op = mcs.args; + op->cmd = level; + op->arg1.mfn = pfn_to_mfn(pfn); + MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); +} + +static int pin_page(struct page *page, enum pt_level level) { unsigned pgfl = test_and_set_bit(PG_pinned, &page->flags); int flush; @@ -396,12 +431,26 @@ static int pin_page(struct page *page, unsigned flags) void *pt = lowmem_page_address(page); unsigned long pfn = page_to_pfn(page); struct multicall_space mcs = __xen_mc_entry(0); + spinlock_t *ptl; flush = 0; + ptl = NULL; + if (level == PT_PTE) + ptl = lock_pte(page); + MULTI_update_va_mapping(mcs.mc, (unsigned long)pt, pfn_pte(pfn, PAGE_KERNEL_RO), - flags); + level == PT_PGD ? UVMF_TLB_FLUSH : 0); + + if (level == PT_PTE) + xen_do_pin(MMUEXT_PIN_L1_TABLE, pfn); + + if (ptl) { + /* Queue a deferred unlock for when this batch + is completed. */ + xen_mc_callback(do_unlock, ptl); + } } return flush; @@ -412,8 +461,7 @@ static int pin_page(struct page *page, unsigned flags) read-only, and can be pinned. */ void xen_pgd_pin(pgd_t *pgd) { - struct multicall_space mcs; - struct mmuext_op *op; + unsigned level; xen_mc_batch(); @@ -424,16 +472,13 @@ void xen_pgd_pin(pgd_t *pgd) xen_mc_batch(); } - mcs = __xen_mc_entry(sizeof(*op)); - op = mcs.args; - #ifdef CONFIG_X86_PAE - op->cmd = MMUEXT_PIN_L3_TABLE; + level = MMUEXT_PIN_L3_TABLE; #else - op->cmd = MMUEXT_PIN_L2_TABLE; + level = MMUEXT_PIN_L2_TABLE; #endif - op->arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(pgd))); - MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); + + xen_do_pin(level, PFN_DOWN(__pa(pgd))); xen_mc_issue(0); } @@ -441,7 +486,7 @@ void xen_pgd_pin(pgd_t *pgd) /* The init_mm pagetable is really pinned as soon as its created, but that's before we have page structures to store the bits. So do all the book-keeping now. */ -static __init int mark_pinned(struct page *page, unsigned flags) +static __init int mark_pinned(struct page *page, enum pt_level level) { SetPagePinned(page); return 0; @@ -452,18 +497,32 @@ void __init xen_mark_init_mm_pinned(void) pgd_walk(init_mm.pgd, mark_pinned, FIXADDR_TOP); } -static int unpin_page(struct page *page, unsigned flags) +static int unpin_page(struct page *page, enum pt_level level) { unsigned pgfl = test_and_clear_bit(PG_pinned, &page->flags); if (pgfl && !PageHighMem(page)) { void *pt = lowmem_page_address(page); unsigned long pfn = page_to_pfn(page); - struct multicall_space mcs = __xen_mc_entry(0); + spinlock_t *ptl = NULL; + struct multicall_space mcs; + + if (level == PT_PTE) { + ptl = lock_pte(page); + + xen_do_pin(MMUEXT_UNPIN_TABLE, pfn); + } + + mcs = __xen_mc_entry(0); MULTI_update_va_mapping(mcs.mc, (unsigned long)pt, pfn_pte(pfn, PAGE_KERNEL), - flags); + level == PT_PGD ? UVMF_TLB_FLUSH : 0); + + if (ptl) { + /* unlock when batch completed */ + xen_mc_callback(do_unlock, ptl); + } } return 0; /* never need to flush on unpin */ @@ -472,18 +531,9 @@ static int unpin_page(struct page *page, unsigned flags) /* Release a pagetables pages back as normal RW */ static void xen_pgd_unpin(pgd_t *pgd) { - struct mmuext_op *op; - struct multicall_space mcs; - xen_mc_batch(); - mcs = __xen_mc_entry(sizeof(*op)); - - op = mcs.args; - op->cmd = MMUEXT_UNPIN_TABLE; - op->arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(pgd))); - - MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); + xen_do_pin(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd))); pgd_walk(pgd, unpin_page, TASK_SIZE); @@ -585,5 +635,6 @@ void xen_exit_mmap(struct mm_struct *mm) /* pgd may not be pinned in the error exit path of execve */ if (PagePinned(virt_to_page(mm->pgd))) xen_pgd_unpin(mm->pgd); + spin_unlock(&mm->page_table_lock); } @@ -137,7 +137,6 @@ config SPLIT_PTLOCK_CPUS int default "4096" if ARM && !CPU_CACHE_VIPT default "4096" if PARISC && !PA20 - default "4096" if XEN default "4" # |