diff options
Diffstat (limited to 'arch/x86/kvm/mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index dd8e3ca2d79b..58c067da6efc 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2063,7 +2063,7 @@ static void mmu_sync_children(struct kvm_vcpu *vcpu, static void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp) { - sp->write_flooding_count = 0; + atomic_set(&sp->write_flooding_count, 0); } static void clear_sp_write_flooding_count(u64 *spte) @@ -3406,6 +3406,23 @@ static bool page_fault_handle_page_track(struct kvm_vcpu *vcpu, return false; } +static void shadow_page_table_clear_flood(struct kvm_vcpu *vcpu, gva_t addr) +{ + struct kvm_shadow_walk_iterator iterator; + u64 spte; + + if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) + return; + + walk_shadow_page_lockless_begin(vcpu); + for_each_shadow_entry_lockless(vcpu, addr, iterator, spte) { + clear_sp_write_flooding_count(iterator.sptep); + if (!is_shadow_present_pte(spte)) + break; + } + walk_shadow_page_lockless_end(vcpu); +} + static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code, bool prefault) { @@ -4221,7 +4238,8 @@ static bool detect_write_flooding(struct kvm_mmu_page *sp) if (sp->role.level == PT_PAGE_TABLE_LEVEL) return false; - return ++sp->write_flooding_count >= 3; + atomic_inc(&sp->write_flooding_count); + return atomic_read(&sp->write_flooding_count) >= 3; } /* |
