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| author |   Avi Kivity <avi@qumranet.com> | 2007-05-31 15:46:04 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-07-16 12:05:44 +0300 |
| commit | e663ee64aefc57f7eff7325142206c4ea0200be8 (patch) | |
| tree | a95c5a1015914ee4101c1770039ad1457e8767c3 /drivers/kvm/mmu.c | |
| parent | KVM: Make shadow pte updates atomic (diff) | |
| download | linux-dev-e663ee64aefc57f7eff7325142206c4ea0200be8.tar.xz linux-dev-e663ee64aefc57f7eff7325142206c4ea0200be8.zip | |
KVM: MMU: Make setting shadow ptes atomic on i386
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/mmu.c')
| -rw-r--r-- | drivers/kvm/mmu.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c index 3cdbf687df25..f24b540148aa 100644 --- a/drivers/kvm/mmu.c +++ b/drivers/kvm/mmu.c @@ -22,6 +22,7 @@ #include <linux/mm.h> #include <linux/highmem.h> #include <linux/module.h> +#include <asm/cmpxchg.h> #include "vmx.h" #include "kvm.h" @@ -204,6 +205,15 @@ static int is_rmap_pte(u64 pte) == (PT_WRITABLE_MASK | PT_PRESENT_MASK); } +static void set_shadow_pte(u64 *sptep, u64 spte) +{ +#ifdef CONFIG_X86_64 + set_64bit((unsigned long *)sptep, spte); +#else + set_64bit((unsigned long long *)sptep, spte); +#endif +} + static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, struct kmem_cache *base_cache, int min, gfp_t gfp_flags) @@ -446,7 +456,7 @@ static void rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn) rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte); rmap_remove(vcpu, spte); kvm_arch_ops->tlb_flush(vcpu); - *spte &= ~(u64)PT_WRITABLE_MASK; + set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK); } } @@ -699,7 +709,7 @@ static void kvm_mmu_zap_page(struct kvm_vcpu *vcpu, } BUG_ON(!parent_pte); kvm_mmu_put_page(vcpu, page, parent_pte); - *parent_pte = 0; + set_shadow_pte(parent_pte, 0); } kvm_mmu_page_unlink_children(vcpu, page); if (!page->root_count) { |