KVM: nVMX: check host CR3 on vmentry and vmexit

This commit adds missing host CR3 checks. Before entering guest mode, the value
of CR3 is checked for reserved bits. After returning, nested_vmx_load_cr3 is
called to set the new CR3 value and check and load PDPTRs.

Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

2 files changed, 19 insertions, 7 deletions

diff --git a/arch/x86/include/uapi/asm/vmx.h b/arch/x86/include/uapi/asm/vmx.h
index f9dea4fd4107..14458658e988 100644
--- a/arch/x86/include/uapi/asm/vmx.h
+++ b/arch/x86/include/uapi/asm/vmx.h
@@ -133,6 +133,7 @@
         { EXIT_REASON_XRSTORS,               "XRSTORS" }
 
 #define VMX_ABORT_SAVE_GUEST_MSR_FAIL        1
+#define VMX_ABORT_LOAD_HOST_PDPTE_FAIL       2
 #define VMX_ABORT_LOAD_HOST_MSR_FAIL         4
 
 #endif /* _UAPIVMX_H */
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index a0d6e59f4f34..7280a355737e 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -9968,6 +9968,14 @@ static int nested_vmx_store_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)
         return 0;
 }
 
+static bool nested_cr3_valid(struct kvm_vcpu *vcpu, unsigned long val)
+{
+        unsigned long invalid_mask;
+
+        invalid_mask = (~0ULL) << cpuid_maxphyaddr(vcpu);
+        return (val & invalid_mask) == 0;
+}
+
 /*
  * Load guest's/host's cr3 at nested entry/exit. nested_ept is true if we are
  * emulating VM entry into a guest with EPT enabled.
@@ -9977,11 +9985,8 @@ static int nested_vmx_store_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)
 static int nested_vmx_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, bool nested_ept,
                                unsigned long *entry_failure_code)
 {
-        unsigned long invalid_mask;
-
         if (cr3 != kvm_read_cr3(vcpu) || (!nested_ept && pdptrs_changed(vcpu))) {
-                invalid_mask = (~0ULL) << cpuid_maxphyaddr(vcpu);
-                if (cr3 & invalid_mask) {
+                if (!nested_cr3_valid(vcpu, cr3)) {
                         *entry_failure_code = ENTRY_FAIL_DEFAULT;
                         return 1;
                 }
@@ -10452,7 +10457,8 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
         }
 
         if (!nested_host_cr0_valid(vcpu, vmcs12->host_cr0) ||
-            !nested_host_cr4_valid(vcpu, vmcs12->host_cr4)) {
+            !nested_host_cr4_valid(vcpu, vmcs12->host_cr4) ||
+            !nested_cr3_valid(vcpu, vmcs12->host_cr3)) {
                 nested_vmx_failValid(vcpu,
                         VMXERR_ENTRY_INVALID_HOST_STATE_FIELD);
                 goto out;
@@ -10879,6 +10885,7 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
                                    struct vmcs12 *vmcs12)
 {
         struct kvm_segment seg;
+        unsigned long entry_failure_code;
 
         if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_EFER)
                 vcpu->arch.efer = vmcs12->host_ia32_efer;
@@ -10916,8 +10923,12 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
 
         nested_ept_uninit_mmu_context(vcpu);
 
-        kvm_set_cr3(vcpu, vmcs12->host_cr3);
-        kvm_mmu_reset_context(vcpu);
+        /*
+         * Only PDPTE load can fail as the value of cr3 was checked on entry and
+         * couldn't have changed.
+         */
+        if (nested_vmx_load_cr3(vcpu, vmcs12->host_cr3, false, &entry_failure_code))
+                nested_vmx_abort(vcpu, VMX_ABORT_LOAD_HOST_PDPTE_FAIL);
 
         if (!enable_ept)
                 vcpu->arch.walk_mmu->inject_page_fault = kvm_inject_page_fault;