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[91.219.240.8]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37d082e6ecbsm2829776f8f.116.2024.10.04.02.04.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Oct 2024 02:04:12 -0700 (PDT) From: Vitaly Kuznetsov To: Sean Christopherson , Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 06/11] KVM: selftests: Verify XCR0 can be "downgraded" and "upgraded" In-Reply-To: <20241003234337.273364-7-seanjc@google.com> References: <20241003234337.273364-1-seanjc@google.com> <20241003234337.273364-7-seanjc@google.com> Date: Fri, 04 Oct 2024 11:04:11 +0200 Message-ID: <87o740i6ic.fsf@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Sean Christopherson writes: > Now that KVM selftests enable all supported XCR0 features by default, add > a testcase to the XCR0 vs. CPUID test to verify that the guest can disable > everything except the legacy FPU in XCR0, and then re-enable the full > feature set, which is kinda sorta what the test did before XCR0 was setup > by default. > > Signed-off-by: Sean Christopherson > --- > tools/testing/selftests/kvm/x86_64/xcr0_cpuid_test.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/tools/testing/selftests/kvm/x86_64/xcr0_cpuid_test.c b/tools/testing/selftests/kvm/x86_64/xcr0_cpuid_test.c > index a4aecdc77da5..c8a5c5e51661 100644 > --- a/tools/testing/selftests/kvm/x86_64/xcr0_cpuid_test.c > +++ b/tools/testing/selftests/kvm/x86_64/xcr0_cpuid_test.c > @@ -79,6 +79,11 @@ static void guest_code(void) > ASSERT_ALL_OR_NONE_XFEATURE(supported_xcr0, > XFEATURE_MASK_XTILE); > > + vector = xsetbv_safe(0, XFEATURE_MASK_FP); > + __GUEST_ASSERT(!vector, > + "Expected success on XSETBV(FP), got vector '0x%x'", > + vector); > + > vector = xsetbv_safe(0, supported_xcr0); > __GUEST_ASSERT(!vector, > "Expected success on XSETBV(0x%lx), got vector '0x%x'", Reviewed-by: Vitaly Kuznetsov -- Vitaly