The FLUSHBYASID CPUID feature controls the availability of commands 0x3 and 0x7 of TLB_CONTROL. If FLUSHBYASID is supported by the VCPU, those TLB_CONTROL commands will be available to nested guests. Therefore, expose FLUSHBYASID CPUID feature to nested guests. Signed-off-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx> --- arch/x86/kvm/svm/svm.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 1a70e11f0487..0f8748af8569 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -931,6 +931,9 @@ static __init void svm_set_cpu_caps(void) /* Nested VM can receive #VMEXIT instead of triggering #GP */ kvm_cpu_cap_set(X86_FEATURE_SVME_ADDR_CHK); + + if (boot_cpu_has(X86_FEATURE_FLUSHBYASID)) + kvm_cpu_cap_set(X86_FEATURE_FLUSHBYASID); } /* CPUID 0x80000008 */ -- 2.27.0
