KVM: MMU: mode specific sync_page

Examine guest pagetable and bring the shadow back in sync. Caller is responsible
for local TLB flush before re-entering guest mode.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 731e6fe9cb0..90f01169c8f 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -871,6 +871,12 @@ static void nonpaging_prefetch_page(struct kvm_vcpu *vcpu,
                 sp->spt[i] = shadow_trap_nonpresent_pte;
 }
 
+static int nonpaging_sync_page(struct kvm_vcpu *vcpu,
+                               struct kvm_mmu_page *sp)
+{
+        return 1;
+}
+
 static struct kvm_mmu_page *kvm_mmu_lookup_page(struct kvm *kvm, gfn_t gfn)
 {
         unsigned index;
@@ -1547,6 +1553,7 @@ static int nonpaging_init_context(struct kvm_vcpu *vcpu)
         context->gva_to_gpa = nonpaging_gva_to_gpa;
         context->free = nonpaging_free;
         context->prefetch_page = nonpaging_prefetch_page;
+        context->sync_page = nonpaging_sync_page;
         context->root_level = 0;
         context->shadow_root_level = PT32E_ROOT_LEVEL;
         context->root_hpa = INVALID_PAGE;
@@ -1594,6 +1601,7 @@ static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level)
         context->page_fault = paging64_page_fault;
         context->gva_to_gpa = paging64_gva_to_gpa;
         context->prefetch_page = paging64_prefetch_page;
+        context->sync_page = paging64_sync_page;
         context->free = paging_free;
         context->root_level = level;
         context->shadow_root_level = level;
@@ -1615,6 +1623,7 @@ static int paging32_init_context(struct kvm_vcpu *vcpu)
         context->gva_to_gpa = paging32_gva_to_gpa;
         context->free = paging_free;
         context->prefetch_page = paging32_prefetch_page;
+        context->sync_page = paging32_sync_page;
         context->root_level = PT32_ROOT_LEVEL;
         context->shadow_root_level = PT32E_ROOT_LEVEL;
         context->root_hpa = INVALID_PAGE;
@@ -1634,6 +1643,7 @@ static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
         context->page_fault = tdp_page_fault;
         context->free = nonpaging_free;
         context->prefetch_page = nonpaging_prefetch_page;
+        context->sync_page = nonpaging_sync_page;
         context->shadow_root_level = kvm_x86_ops->get_tdp_level();
         context->root_hpa = INVALID_PAGE;