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[31.46.245.48]) by smtp.gmail.com with ESMTPSA id h14-20020a170906590e00b00992b2c55c67sm760112ejq.156.2023.10.03.02.40.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Oct 2023 02:40:31 -0700 (PDT) Sender: Ingo Molnar Date: Tue, 3 Oct 2023 11:40:29 +0200 From: Ingo Molnar To: Jinank Jain Cc: seanjc@google.com, pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, jinankjain@microsoft.com, thomas.lendacky@amd.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, wei.liu@kernel.org, tiala@microsoft.com Subject: Re: [PATCH] arch/x86: Set XSS while handling #VC intercept for CPUID Message-ID: References: <20231003092835.18974-1-jinankjain@linux.microsoft.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20231003092835.18974-1-jinankjain@linux.microsoft.com> X-Spam-Status: No, score=-1.5 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Tue, 03 Oct 2023 02:40:50 -0700 (PDT) * Jinank Jain wrote: > According to [1], while handling the #VC intercept for CPUID leaf > 0x0000_000D, we need to supply the value of XSS in the GHCB page. If > this value is not provided then a spec compliant hypervisor can fail the > GHCB request and kill the guest. > > [1] https://www.amd.com/system/files/TechDocs/56421-guest-hypervisor-communication-block-standardization.pdf URL doesn't seem to exist, I get redirected to AMD's 404 page. Thanks, Ingo