x86: kvm: mmu: use ept a/d in vmcs02 iff used in vmcs12

EPT A/D was enabled in the vmcs02 EPTP regardless of the vmcs12's EPTP
value. The problem is that enabling A/D changes the behavior of L2's
x86 page table walks as seen by L1. With A/D enabled, x86 page table
walks are always treated as EPT writes.

Commit ae1e2d1082ae ("kvm: nVMX: support EPT accessed/dirty bits",
2017-03-30) tried to work around this problem by clearing the write
bit in the exit qualification for EPT violations triggered by page
walks.  However, that fixup introduced the opposite bug: page-table walks
that actually set x86 A/D bits were *missing* the write bit in the exit
qualification.

This patch fixes the problem by disabling EPT A/D in the shadow MMU
when EPT A/D is disabled in vmcs12's EPTP.

Signed-off-by: Peter Feiner <pfeiner@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 48d8e7e..3ba600d 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4419,6 +4419,7 @@ void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly,
        context->root_level = context->shadow_root_level;
        context->root_hpa = INVALID_PAGE;
        context->direct_map = false;
+       context->base_role.ad_disabled = !accessed_dirty;
 
        update_permission_bitmask(vcpu, context, true);
        update_pkru_bitmask(vcpu, context, true);

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index b102a86..fb04712 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -910,8 +910,9 @@ static void nested_release_page_clean(struct page *page)
        kvm_release_page_clean(page);
 }
 
+static bool nested_ept_ad_enabled(struct kvm_vcpu *vcpu);
 static unsigned long nested_ept_get_cr3(struct kvm_vcpu *vcpu);
-static u64 construct_eptp(unsigned long root_hpa);
+static u64 construct_eptp(struct kvm_vcpu *vcpu, unsigned long root_hpa);
 static bool vmx_xsaves_supported(void);
 static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr);
 static void vmx_set_segment(struct kvm_vcpu *vcpu,
@@ -4013,7 +4014,7 @@ static inline void __vmx_flush_tlb(struct kvm_vcpu *vcpu, int vpid)
        if (enable_ept) {
                if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
                        return;
-               ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa));
+               ept_sync_context(construct_eptp(vcpu, vcpu->arch.mmu.root_hpa));
        } else {
                vpid_sync_context(vpid);
        }
@@ -4188,14 +4189,15 @@ static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
        vmx->emulation_required = emulation_required(vcpu);
 }
 
-static u64 construct_eptp(unsigned long root_hpa)
+static u64 construct_eptp(struct kvm_vcpu *vcpu, unsigned long root_hpa)
 {
        u64 eptp;
 
        /* TODO write the value reading from MSR */
        eptp = VMX_EPT_DEFAULT_MT |
                VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
-       if (enable_ept_ad_bits)
+       if (enable_ept_ad_bits &&
+           (!is_guest_mode(vcpu) || nested_ept_ad_enabled(vcpu)))
                eptp |= VMX_EPT_AD_ENABLE_BIT;
        eptp |= (root_hpa & PAGE_MASK);
 
@@ -4209,7 +4211,7 @@ static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 
        guest_cr3 = cr3;
        if (enable_ept) {
-               eptp = construct_eptp(cr3);
+               eptp = construct_eptp(vcpu, cr3);
                vmcs_write64(EPT_POINTER, eptp);
                if (is_paging(vcpu) || is_guest_mode(vcpu))
                        guest_cr3 = kvm_read_cr3(vcpu);
@@ -6214,17 +6216,6 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
 
        exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
 
-       if (is_guest_mode(vcpu)
-           && !(exit_qualification & EPT_VIOLATION_GVA_TRANSLATED)) {
-               /*
-                * Fix up exit_qualification according to whether guest
-                * page table accesses are reads or writes.
-                */
-               u64 eptp = nested_ept_get_cr3(vcpu);
-               if (!(eptp & VMX_EPT_AD_ENABLE_BIT))
-                       exit_qualification &= ~EPT_VIOLATION_ACC_WRITE;
-       }
-
        /*
         * EPT violation happened while executing iret from NMI,
         * "blocked by NMI" bit has to be set before next VM entry.
@@ -6447,7 +6438,7 @@ void vmx_enable_tdp(void)
                enable_ept_ad_bits ? VMX_EPT_DIRTY_BIT : 0ull,
                0ull, VMX_EPT_EXECUTABLE_MASK,
                cpu_has_vmx_ept_execute_only() ? 0ull : VMX_EPT_READABLE_MASK,
-               enable_ept_ad_bits ? 0ull : VMX_EPT_RWX_MASK);
+               VMX_EPT_RWX_MASK);
 
        ept_set_mmio_spte_mask();
        kvm_enable_tdp();
@@ -9393,6 +9384,11 @@ static void nested_ept_inject_page_fault(struct kvm_vcpu *vcpu,
        vmcs12->guest_physical_address = fault->address;
 }
 
+static bool nested_ept_ad_enabled(struct kvm_vcpu *vcpu)
+{
+       return nested_ept_get_cr3(vcpu) & VMX_EPT_AD_ENABLE_BIT;
+}
+
 /* Callbacks for nested_ept_init_mmu_context: */
 
 static unsigned long nested_ept_get_cr3(struct kvm_vcpu *vcpu)
@@ -9403,18 +9399,18 @@ static unsigned long nested_ept_get_cr3(struct kvm_vcpu *vcpu)
 
 static int nested_ept_init_mmu_context(struct kvm_vcpu *vcpu)
 {
-       u64 eptp;
+       bool wants_ad;
 
        WARN_ON(mmu_is_nested(vcpu));
-       eptp = nested_ept_get_cr3(vcpu);
-       if ((eptp & VMX_EPT_AD_ENABLE_BIT) && !enable_ept_ad_bits)
+       wants_ad = nested_ept_ad_enabled(vcpu);
+       if (wants_ad && !enable_ept_ad_bits)
                return 1;
 
        kvm_mmu_unload(vcpu);
        kvm_init_shadow_ept_mmu(vcpu,
                        to_vmx(vcpu)->nested.nested_vmx_ept_caps &
                        VMX_EPT_EXECUTE_ONLY_BIT,
-                       eptp & VMX_EPT_AD_ENABLE_BIT);
+                       wants_ad);
        vcpu->arch.mmu.set_cr3           = vmx_set_cr3;
        vcpu->arch.mmu.get_cr3           = nested_ept_get_cr3;
        vcpu->arch.mmu.inject_page_fault = nested_ept_inject_page_fault;