kvm: x86: fix stale mmio cache bug

commit 56f17dd3fbc44adcdbc3340fe3988ddb833a47a7 upstream.

The following events can lead to an incorrect KVM_EXIT_MMIO bubbling
up to userspace:

(1) Guest accesses gpa X without a memory slot. The gfn is cached in
struct kvm_vcpu_arch (mmio_gfn). On Intel EPT-enabled hosts, KVM sets
the SPTE write-execute-noread so that future accesses cause
EPT_MISCONFIGs.

(2) Host userspace creates a memory slot via KVM_SET_USER_MEMORY_REGION
covering the page just accessed.

(3) Guest attempts to read or write to gpa X again. On Intel, this
generates an EPT_MISCONFIG. The memory slot generation number that
was incremented in (2) would normally take care of this but we fast
path mmio faults through quickly_check_mmio_pf(), which only checks
the per-vcpu mmio cache. Since we hit the cache, KVM passes a
KVM_EXIT_MMIO up to userspace.

This patch fixes the issue by using the memslot generation number
to validate the mmio cache.

Signed-off-by: David Matlack <dmatlack@google.com>
[xiaoguangrong: adjust the code to make it simpler for stable-tree fix.]
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Tested-by: David Matlack <dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 15d24cb..9171618 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -435,6 +435,7 @@ struct kvm_vcpu_arch {
        u64 mmio_gva;
        unsigned access;
        gfn_t mmio_gfn;
+       u64 mmio_gen;
 
        /* 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 db2ffef..bfc9507 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2842,7 +2842,7 @@ static void mmu_sync_roots(struct kvm_vcpu *vcpu)
        if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
                return;
 
-       vcpu_clear_mmio_info(vcpu, ~0ul);
+       vcpu_clear_mmio_info(vcpu, MMIO_GVA_ANY);
        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;

diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 0e22f64..6c3c94f 100644 (file)
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -81,15 +81,23 @@ static inline void vcpu_cache_mmio_info(struct kvm_vcpu *vcpu,
        vcpu->arch.mmio_gva = gva & PAGE_MASK;
        vcpu->arch.access = access;
        vcpu->arch.mmio_gfn = gfn;
+       vcpu->arch.mmio_gen = kvm_memslots(vcpu->kvm)->generation;
+}
+
+static inline bool vcpu_match_mmio_gen(struct kvm_vcpu *vcpu)
+{
+       return vcpu->arch.mmio_gen == kvm_memslots(vcpu->kvm)->generation;
 }
 
 /*
- * Clear the mmio cache info for the given gva,
- * specially, if gva is ~0ul, we clear all mmio cache info.
+ * Clear the mmio cache info for the given gva. If gva is MMIO_GVA_ANY, we
+ * clear all mmio cache info.
  */
+#define MMIO_GVA_ANY (~(gva_t)0)
+
 static inline void vcpu_clear_mmio_info(struct kvm_vcpu *vcpu, gva_t gva)
 {
-       if (gva != (~0ul) && vcpu->arch.mmio_gva != (gva & PAGE_MASK))
+       if (gva != MMIO_GVA_ANY && vcpu->arch.mmio_gva != (gva & PAGE_MASK))
                return;
 
        vcpu->arch.mmio_gva = 0;
@@ -97,7 +105,8 @@ static inline void vcpu_clear_mmio_info(struct kvm_vcpu *vcpu, gva_t gva)
 
 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))
+       if (vcpu_match_mmio_gen(vcpu) && vcpu->arch.mmio_gva &&
+             vcpu->arch.mmio_gva == (gva & PAGE_MASK))
                return true;
 
        return false;
@@ -105,7 +114,8 @@ static inline bool vcpu_match_mmio_gva(struct kvm_vcpu *vcpu, unsigned long gva)
 
 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)
+       if (vcpu_match_mmio_gen(vcpu) && vcpu->arch.mmio_gfn &&
+             vcpu->arch.mmio_gfn == gpa >> PAGE_SHIFT)
                return true;
 
        return false;