KVM: MMU: cache mmio info on page fault path

If the page fault is caused by mmio, we can cache the mmio info, later, we do
not need to walk guest page table and quickly know it is a mmio fault while we
emulate the mmio instruction

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

6 files changed, 96 insertions, 21 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 59086a77ff1..8da1400ab58 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -424,6 +424,11 @@ struct kvm_vcpu_arch {
         u64 mcg_ctl;
         u64 *mce_banks;
 
+        /* Cache MMIO info */
+        u64 mmio_gva;
+        unsigned access;
+        gfn_t mmio_gfn;
+
         /* used for guest single stepping over the given code position */
         unsigned long singlestep_rip;
 
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 02c839f40e2..d1986b7dcec 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -217,11 +217,6 @@ void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
 }
 EXPORT_SYMBOL_GPL(kvm_mmu_set_mask_ptes);
 
-static bool is_write_protection(struct kvm_vcpu *vcpu)
-{
-        return kvm_read_cr0_bits(vcpu, X86_CR0_WP);
-}
-
 static int is_cpuid_PSE36(void)
 {
         return 1;
@@ -243,11 +238,6 @@ static int is_large_pte(u64 pte)
         return pte & PT_PAGE_SIZE_MASK;
 }
 
-static int is_writable_pte(unsigned long pte)
-{
-        return pte & PT_WRITABLE_MASK;
-}
-
 static int is_dirty_gpte(unsigned long pte)
 {
         return pte & PT_DIRTY_MASK;
@@ -2247,15 +2237,17 @@ static void kvm_send_hwpoison_signal(unsigned long address, struct task_struct *
         send_sig_info(SIGBUS, &info, tsk);
 }
 
-static int kvm_handle_bad_page(struct kvm *kvm, gfn_t gfn, pfn_t pfn)
+static int kvm_handle_bad_page(struct kvm_vcpu *vcpu, gva_t gva,
+                               unsigned access, gfn_t gfn, pfn_t pfn)
 {
         kvm_release_pfn_clean(pfn);
         if (is_hwpoison_pfn(pfn)) {
-                kvm_send_hwpoison_signal(gfn_to_hva(kvm, gfn), current);
+                kvm_send_hwpoison_signal(gfn_to_hva(vcpu->kvm, gfn), current);
                 return 0;
         } else if (is_fault_pfn(pfn))
                 return -EFAULT;
 
+        vcpu_cache_mmio_info(vcpu, gva, gfn, access);
         return 1;
 }
 
@@ -2337,7 +2329,7 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn,
 
         /* mmio */
         if (is_error_pfn(pfn))
-                return kvm_handle_bad_page(vcpu->kvm, gfn, pfn);
+                return kvm_handle_bad_page(vcpu, v, ACC_ALL, gfn, pfn);
 
         spin_lock(&vcpu->kvm->mmu_lock);
         if (mmu_notifier_retry(vcpu, mmu_seq))
@@ -2564,6 +2556,7 @@ static void mmu_sync_roots(struct kvm_vcpu *vcpu)
         if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
                 return;
 
+        vcpu_clear_mmio_info(vcpu, ~0ul);
         trace_kvm_mmu_audit(vcpu, AUDIT_PRE_SYNC);
         if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) {
                 hpa_t root = vcpu->arch.mmu.root_hpa;
@@ -2710,7 +2703,7 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, u32 error_code,
 
         /* mmio */
         if (is_error_pfn(pfn))
-                return kvm_handle_bad_page(vcpu->kvm, gfn, pfn);
+                return kvm_handle_bad_page(vcpu, 0, 0, gfn, pfn);
         spin_lock(&vcpu->kvm->mmu_lock);
         if (mmu_notifier_retry(vcpu, mmu_seq))
                 goto out_unlock;
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index 7086ca85d3e..05310b105da 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -76,4 +76,27 @@ static inline int is_present_gpte(unsigned long pte)
         return pte & PT_PRESENT_MASK;
 }
 
+static inline int is_writable_pte(unsigned long pte)
+{
+        return pte & PT_WRITABLE_MASK;
+}
+
+static inline bool is_write_protection(struct kvm_vcpu *vcpu)
+{
+        return kvm_read_cr0_bits(vcpu, X86_CR0_WP);
+}
+
+static inline bool check_write_user_access(struct kvm_vcpu *vcpu,
+                                           bool write_fault, bool user_fault,
+                                           unsigned long pte)
+{
+        if (unlikely(write_fault && !is_writable_pte(pte)
+              && (user_fault || is_write_protection(vcpu))))
+                return false;
+
+        if (unlikely(user_fault && !(pte & PT_USER_MASK)))
+                return false;
+
+        return true;
+}
 #endif
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 1e1c2444cef..f0fb1a4c522 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -208,11 +208,8 @@ retry_walk:
                         goto error;
                 }
 
-                if (unlikely(write_fault && !is_writable_pte(pte)
-                             && (user_fault || is_write_protection(vcpu))))
-                        eperm = true;
-
-                if (unlikely(user_fault && !(pte & PT_USER_MASK)))
+                if (!check_write_user_access(vcpu, write_fault, user_fault,
+                                          pte))
                         eperm = true;
 
 #if PTTYPE == 64
@@ -625,8 +622,16 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code,
                 return 0;
 
         /* mmio */
-        if (is_error_pfn(pfn))
-                return kvm_handle_bad_page(vcpu->kvm, walker.gfn, pfn);
+        if (is_error_pfn(pfn)) {
+                unsigned access = walker.pte_access;
+                bool dirty = is_dirty_gpte(walker.ptes[walker.level - 1]);
+
+                if (!dirty)
+                        access &= ~ACC_WRITE_MASK;
+
+                return kvm_handle_bad_page(vcpu, mmu_is_nested(vcpu) ? 0 :
+                                           addr, access, walker.gfn, pfn);
+        }
 
         spin_lock(&vcpu->kvm->mmu_lock);
         if (mmu_notifier_retry(vcpu, mmu_seq))
@@ -666,6 +671,8 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
         u64 *sptep;
         int need_flush = 0;
 
+        vcpu_clear_mmio_info(vcpu, gva);
+
         spin_lock(&vcpu->kvm->mmu_lock);
 
         for_each_shadow_entry(vcpu, gva, iterator) {
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a1dbd044354..028a0f25e8a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4016,6 +4016,14 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
 {
         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
 
+        if (vcpu_match_mmio_gva(vcpu, gva) &&
+                  check_write_user_access(vcpu, write, access,
+                  vcpu->arch.access)) {
+                *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT |
+                                        (gva & (PAGE_SIZE - 1));
+                return 1;
+        }
+
         if (write)
                 access |= PFERR_WRITE_MASK;
 
@@ -4028,6 +4036,9 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
         if ((*gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
                 return 1;
 
+        if (vcpu_match_mmio_gpa(vcpu, *gpa))
+                return 1;
+
         return 0;
 }
 
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 256da82856b..d36fe237c66 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -75,6 +75,42 @@ static inline u32 bit(int bitno)
         return 1 << (bitno & 31);
 }
 
+static inline void vcpu_cache_mmio_info(struct kvm_vcpu *vcpu,
+                                        gva_t gva, gfn_t gfn, unsigned access)
+{
+        vcpu->arch.mmio_gva = gva & PAGE_MASK;
+        vcpu->arch.access = access;
+        vcpu->arch.mmio_gfn = gfn;
+}
+
+/*
+ * Clear the mmio cache info for the given gva,
+ * specially, if gva is ~0ul, we clear all mmio cache info.
+ */
+static inline void vcpu_clear_mmio_info(struct kvm_vcpu *vcpu, gva_t gva)
+{
+        if (gva != (~0ul) && vcpu->arch.mmio_gva != (gva & PAGE_MASK))
+                return;
+
+        vcpu->arch.mmio_gva = 0;
+}
+
+static inline bool vcpu_match_mmio_gva(struct kvm_vcpu *vcpu, unsigned long gva)
+{
+        if (vcpu->arch.mmio_gva && vcpu->arch.mmio_gva == (gva & PAGE_MASK))
+                return true;
+
+        return false;
+}
+
+static inline bool vcpu_match_mmio_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
+{
+        if (vcpu->arch.mmio_gfn && vcpu->arch.mmio_gfn == gpa >> PAGE_SHIFT)
+                return true;
+
+        return false;
+}
+
 void kvm_before_handle_nmi(struct kvm_vcpu *vcpu);
 void kvm_after_handle_nmi(struct kvm_vcpu *vcpu);
 int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip);