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Wed, 11 Sep 2024 05:34:22 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGc+Xq4e8/dTvEEQA4QDseIOmVkIgTO67keasg7fRv3bfJF66PtEtbBmMN3DrWYzSvO3S6hdw== X-Received: by 2002:a5d:4402:0:b0:371:a70d:107e with SMTP id ffacd0b85a97d-37892685889mr7410228f8f.6.1726058061589; Wed, 11 Sep 2024 05:34:21 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: Fabiano Rosas , Fabian Vogt Subject: [PULL 12/17] target/i386: Expose IBPB-BRTYPE and SBPB CPUID bits to the guest Date: Wed, 11 Sep 2024 14:33:37 +0200 Message-ID: <20240911123342.339482-13-pbonzini@redhat.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240911123342.339482-1-pbonzini@redhat.com> References: <20240911123342.339482-1-pbonzini@redhat.com> MIME-Version: 1.0 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=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.144, 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=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1726058275940116600 Content-Type: text/plain; charset="utf-8" From: Fabiano Rosas According to AMD's Speculative Return Stack Overflow whitepaper (link below), the hypervisor should synthesize the value of IBPB_BRTYPE and SBPB CPUID bits to the guest. Support for this is already present in the kernel with commit e47d86083c66 ("KVM: x86: Add SBPB support") and commit 6f0f23ef76be ("KVM: x86: Add IBPB_BRTYPE support"). Add support in QEMU to expose the bits to the guest OS. host: # cat /sys/devices/system/cpu/vulnerabilities/spec_rstack_overflow Mitigation: Safe RET before (guest): $ cpuid -l 0x80000021 -1 -r 0x80000021 0x00: eax=3D0x00000045 ebx=3D0x00000000 ecx=3D0x00000000 edx= =3D0x00000000 ^ $ cat /sys/devices/system/cpu/vulnerabilities/spec_rstack_overflow Vulnerable: Safe RET, no microcode after (guest): $ cpuid -l 0x80000021 -1 -r 0x80000021 0x00: eax=3D0x18000045 ebx=3D0x00000000 ecx=3D0x00000000 edx= =3D0x00000000 ^ $ cat /sys/devices/system/cpu/vulnerabilities/spec_rstack_overflow Mitigation: Safe RET Reported-by: Fabian Vogt Link: https://www.amd.com/content/dam/amd/en/documents/corporate/cr/specula= tive-return-stack-overflow-whitepaper.pdf Signed-off-by: Fabiano Rosas Link: https://lore.kernel.org/r/20240805202041.5936-1-farosas@suse.de Signed-off-by: Paolo Bonzini --- target/i386/cpu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 31f287cae05..ff227a8c5c8 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -1221,8 +1221,8 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] =3D { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, - NULL, NULL, NULL, NULL, - NULL, NULL, NULL, NULL, + NULL, NULL, NULL, "sbpb", + "ibpb-brtype", NULL, NULL, NULL, }, .cpuid =3D { .eax =3D 0x80000021, .reg =3D R_EAX, }, .tcg_features =3D 0, --=20 2.46.0