Commit ae8e6ad8 authored by Sean Christopherson's avatar Sean Christopherson
Browse files

KVM: nVMX: Add consistency check for TSC_MULTIPLIER=0 

Add a missing consistency check on the TSC Multiplier being '0'.  Per the
SDM:

  If the "use TSC scaling" VM-execution control is 1, the TSC-multiplier
  must not be zero.

Fixes: d041b5ea ("KVM: nVMX: Enable nested TSC scaling")
Link: https://lore.kernel.org/r/20250919005955.1366256-7-seanjc@google.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent 15fe455d

arch/x86/kvm/vmx/nested.c

+4 −0
Original line number Diff line number Diff line
@@ -2962,6 +2962,10 @@ static int nested_check_vm_execution_controls(struct kvm_vcpu *vcpu, 
		}

	}



	if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_TSC_SCALING) &&

	    CC(!vmcs12->tsc_multiplier))

		return -EINVAL;



	return 0;

}