From ae8e6ad84177456d8810a8ff3a5cf3f477fb0721 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Thu, 18 Sep 2025 17:59:52 -0700 Subject: [PATCH] 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: d041b5ea9335 ("KVM: nVMX: Enable nested TSC scaling") Link: https://lore.kernel.org/r/20250919005955.1366256-7-seanjc@google.com Signed-off-by: Sean Christopherson --- arch/x86/kvm/vmx/nested.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index ffd2628b9c1ea..77b5f75cc2bb5 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -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; } -- 2.47.3