4 files changed, 28 insertions, 12 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index b5f4c1a36d65..c3076bcf5ef7 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -241,7 +241,7 @@ struct kvm_mmu {
         void (*new_cr3)(struct kvm_vcpu *vcpu);
         void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long root);
         unsigned long (*get_cr3)(struct kvm_vcpu *vcpu);
-        int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
+        int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err, bool no_apf);
         void (*inject_page_fault)(struct kvm_vcpu *vcpu);
         void (*free)(struct kvm_vcpu *vcpu);
         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva, u32 access,
@@ -815,6 +815,8 @@ void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
                                      struct kvm_async_pf *work);
 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
                                  struct kvm_async_pf *work);
+void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
+                               struct kvm_async_pf *work);
 extern bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn);
 
 #endif /* _ASM_X86_KVM_HOST_H */
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 4ab04de5a76a..b2c60986a7ce 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2570,7 +2570,7 @@ static gpa_t nonpaging_gva_to_gpa_nested(struct kvm_vcpu *vcpu, gva_t vaddr,
 }
 
 static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
-                                u32 error_code)
+                                u32 error_code, bool no_apf)
 {
         gfn_t gfn;
         int r;
@@ -2606,8 +2606,8 @@ static bool can_do_async_pf(struct kvm_vcpu *vcpu)
         return kvm_x86_ops->interrupt_allowed(vcpu);
 }
 
-static bool try_async_pf(struct kvm_vcpu *vcpu, gfn_t gfn, gva_t gva,
-                         pfn_t *pfn)
+static bool try_async_pf(struct kvm_vcpu *vcpu, bool no_apf, gfn_t gfn,
+                         gva_t gva, pfn_t *pfn)
 {
         bool async;
 
@@ -2618,7 +2618,7 @@ static bool try_async_pf(struct kvm_vcpu *vcpu, gfn_t gfn, gva_t gva,
 
         put_page(pfn_to_page(*pfn));
 
-        if (can_do_async_pf(vcpu)) {
+        if (!no_apf && can_do_async_pf(vcpu)) {
                 trace_kvm_try_async_get_page(async, *pfn);
                 if (kvm_find_async_pf_gfn(vcpu, gfn)) {
                         trace_kvm_async_pf_doublefault(gva, gfn);
@@ -2633,8 +2633,8 @@ static bool try_async_pf(struct kvm_vcpu *vcpu, gfn_t gfn, gva_t gva,
         return false;
 }
 
-static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa,
-                                u32 error_code)
+static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, u32 error_code,
+                          bool no_apf)
 {
         pfn_t pfn;
         int r;
@@ -2656,7 +2656,7 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa,
         mmu_seq = vcpu->kvm->mmu_notifier_seq;
         smp_rmb();
 
-        if (try_async_pf(vcpu, gfn, gpa, &pfn))
+        if (try_async_pf(vcpu, no_apf, gfn, gpa, &pfn))
                 return 0;
 
         /* mmio */
@@ -3319,7 +3319,7 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code)
         int r;
         enum emulation_result er;
 
-        r = vcpu->arch.mmu.page_fault(vcpu, cr2, error_code);
+        r = vcpu->arch.mmu.page_fault(vcpu, cr2, error_code, false);
         if (r < 0)
                 goto out;
 
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index c45376dd041a..d6b281e989b1 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -527,8 +527,8 @@ out_gpte_changed:
  *  Returns: 1 if we need to emulate the instruction, 0 otherwise, or
  *           a negative value on error.
  */
-static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
-                               u32 error_code)
+static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code,
+                             bool no_apf)
 {
         int write_fault = error_code & PFERR_WRITE_MASK;
         int user_fault = error_code & PFERR_USER_MASK;
@@ -569,7 +569,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
         mmu_seq = vcpu->kvm->mmu_notifier_seq;
         smp_rmb();
 
-        if (try_async_pf(vcpu, walker.gfn, addr, &pfn))
+        if (try_async_pf(vcpu, no_apf, walker.gfn, addr, &pfn))
                 return 0;
 
         /* mmio */
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3cd4d091c2f3..71beb27597fd 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6138,6 +6138,20 @@ void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
 }
 EXPORT_SYMBOL_GPL(kvm_set_rflags);
 
+void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work)
+{
+        int r;
+
+        if (!vcpu->arch.mmu.direct_map || is_error_page(work->page))
+                return;
+
+        r = kvm_mmu_reload(vcpu);
+        if (unlikely(r))
+                return;
+
+        vcpu->arch.mmu.page_fault(vcpu, work->gva, 0, true);
+}
+
 static inline u32 kvm_async_pf_hash_fn(gfn_t gfn)
 {
         return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU));