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bh=kJ1X9tL+8X9iETr0946BQomjGJC2BtyDNZqQzsORQj8=; b=b/1yIBNatKaNKZwoq9fBHtzO7gXpCQ0QDgVSGU5U1muGcDePY0huEss/NTj6gMpXJo4a6f TV0s+pgLRhbvkZ1YXg/Slf6mU9HGfQvH3WylruHn00yfYidNpKXLU48L3fBwzgnoA2P3w4 pnB1Yy5TrMdyC1UBXNTcvLPP1VoERPE= X-MC-Unique: aqkOrfpiPwSBR2J7yf5ULA-1 From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 31/31] i386: Mask SVM features if nested SVM is disabled Date: Wed, 24 Jun 2020 06:50:48 -0400 Message-Id: <20200624105048.375353-31-pbonzini@redhat.com> In-Reply-To: <20200624104917.375143-1-pbonzini@redhat.com> References: <20200624104917.375143-1-pbonzini@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.139.110.61; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/24 00:34:35 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Yanan Fu , Eduardo Habkost Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Eduardo Habkost QEMU incorrectly validates FEAT_SVM feature flags against GET_SUPPORTED_CPUID even if SVM features are being masked out by cpu_x86_cpuid(). This can make QEMU print warnings on most AMD CPU models, even when SVM nesting is disabled (which is the default). This bug was never detected before because of a Linux KVM bug: until Linux v5.6, KVM was not filtering out SVM features in GET_SUPPORTED_CPUID when nested was disabled. This KVM bug was fixed in Linux v5.7-rc1, on Linux commit a50718cc3f43 ("KVM: nSVM: Expose SVM features to L1 iff nested is enabled"). Fix the problem by adding a CPUID_EXT3_SVM dependency to all FEAT_SVM feature flags in the feature_dependencies table. Reported-by: Yanan Fu Signed-off-by: Eduardo Habkost Message-Id: <20200623230116.277409-1-ehabkost@redhat.com> [Fix testcase. - Paolo] Signed-off-by: Paolo Bonzini --- target/i386/cpu.c | 4 ++++ tests/qtest/test-x86-cpuid-compat.c | 4 ++-- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 06dc013d88..36cbd3d027 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -1404,6 +1404,10 @@ static FeatureDep feature_dependencies[] =3D { .from =3D { FEAT_VMX_SECONDARY_CTLS, VMX_SECONDARY_EXEC_ENABLE_VM= FUNC }, .to =3D { FEAT_VMX_VMFUNC, ~0ull }, }, + { + .from =3D { FEAT_8000_0001_ECX, CPUID_EXT3_SVM }, + .to =3D { FEAT_SVM, ~0ull }, + }, }; =20 typedef struct X86RegisterInfo32 { diff --git a/tests/qtest/test-x86-cpuid-compat.c b/tests/qtest/test-x86-cpu= id-compat.c index 772287bdb4..7ca1883a29 100644 --- a/tests/qtest/test-x86-cpuid-compat.c +++ b/tests/qtest/test-x86-cpuid-compat.c @@ -256,7 +256,7 @@ int main(int argc, char **argv) "-cpu 486,+invtsc", "xlevel", 0x80000007); /* CPUID[8000_000A].EDX: */ add_cpuid_test("x86/cpuid/auto-xlevel/486/npt", - "-cpu 486,+npt", "xlevel", 0x8000000A); + "-cpu 486,+svm,+npt", "xlevel", 0x8000000A); /* CPUID[C000_0001].EDX: */ add_cpuid_test("x86/cpuid/auto-xlevel2/phenom/xstore", "-cpu phenom,+xstore", "xlevel2", 0xC0000001); @@ -348,7 +348,7 @@ int main(int argc, char **argv) "-machine pc-i440fx-2.4 -cpu SandyBridge,", "xlevel", 0x80000008); add_cpuid_test("x86/cpuid/xlevel-compat/pc-i440fx-2.4/npt-on", - "-machine pc-i440fx-2.4 -cpu SandyBridge,+npt", + "-machine pc-i440fx-2.4 -cpu SandyBridge,+svm,+npt", "xlevel", 0x80000008); =20 /* Test feature parsing */ --=20 2.26.2