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KVM: nVMX: Add consistency check for TPR_THRESHOLD[31:4]!=0 without VID

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Add a missing consistency check on the TPR Threshold.  Per the SDM

  If the "use TPR shadow" VM-execution control is 1 and the "virtual-
  interrupt delivery" VM-execution control is 0, bits 31:4 of the TPR
  threshold VM-execution control field must be 0.

Note, nested_vmx_check_tpr_shadow_controls() bails early if "use TPR
shadow" is 0.

Link: https://lore.kernel.org/r/20250919005955.1366256-6-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2025-09-18 17:59:51 -07:00
parent 2f723a8634
commit 15fe455dd1
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/vmx/nested.c
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@@ -555,6 +555,9 @@ static int nested_vmx_check_tpr_shadow_controls(struct kvm_vcpu *vcpu,
if (CC(!page_address_valid(vcpu, vmcs12->virtual_apic_page_addr)))
return -EINVAL;
if (CC(!nested_cpu_has_vid(vmcs12) && vmcs12->tpr_threshold >> 4))
return -EINVAL;
return 0;
}