[v2,02/32] KVM: nVMX: Validate the EPTP when emulating INVEPT(EXTENT_CONTEXT)
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Message ID 20200317045238.30434-3-sean.j.christopherson@intel.com
State New
Headers show
Series
  • KVM: x86: TLB flushing fixes and enhancements
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Commit Message

Sean Christopherson March 17, 2020, 4:52 a.m. UTC
Signal VM-Fail for the single-context variant of INVEPT if the specified
EPTP is invalid.  Per the INEVPT pseudocode in Intel's SDM, it's subject
to the standard EPT checks:

  If VM entry with the "enable EPT" VM execution control set to 1 would
  fail due to the EPTP value then VMfail(Invalid operand to INVEPT/INVVPID);

Fixes: bfd0a56b90005 ("nEPT: Nested INVEPT")
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/vmx/nested.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Patch
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diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 8578513907d7..f3774cef4fd4 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -5156,8 +5156,12 @@  static int handle_invept(struct kvm_vcpu *vcpu)
 	}
 
 	switch (type) {
-	case VMX_EPT_EXTENT_GLOBAL:
 	case VMX_EPT_EXTENT_CONTEXT:
+		if (!nested_vmx_check_eptp(vcpu, operand.eptp))
+			return nested_vmx_failValid(vcpu,
+				VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
+		fallthrough;
+	case VMX_EPT_EXTENT_GLOBAL:
 	/*
 	 * TODO: Sync the necessary shadow EPT roots here, rather than
 	 * at the next emulated VM-entry.