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Mon, 03 Jun 2024 23:45:40 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFcVM153EwFrp5U0WJ4kJY5b6Q698+fFJE8mRQT0XOIUpiFfoiK1/gwuIyQ8Mrss1H0M6PUiw== X-Received: by 2002:a17:906:6a15:b0:a68:f614:ce4f with SMTP id a640c23a62f3a-a68f614d046mr439976866b.21.1717483540353; Mon, 03 Jun 2024 23:45:40 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: Michael Roth , Pankaj Gupta Subject: [PULL 31/45] i386/sev: Set CPU state to protected once SNP guest payload is finalized Date: Tue, 4 Jun 2024 08:43:55 +0200 Message-ID: <20240604064409.957105-32-pbonzini@redhat.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240604064409.957105-1-pbonzini@redhat.com> References: <20240604064409.957105-1-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: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: 1717483815031100001 Content-Type: text/plain; charset="utf-8" From: Michael Roth Once KVM_SNP_LAUNCH_FINISH is called the vCPU state is copied into the vCPU's VMSA page and measured/encrypted. Any attempt to read/write CPU state afterward will only be acting on the initial data and so are effectively no-ops. Set the vCPU state to protected at this point so that QEMU don't continue trying to re-sync vCPU data during guest runtime. Signed-off-by: Michael Roth Signed-off-by: Pankaj Gupta Message-ID: <20240530111643.1091816-18-pankaj.gupta@amd.com> Signed-off-by: Paolo Bonzini --- target/i386/sev.c | 1 + 1 file changed, 1 insertion(+) diff --git a/target/i386/sev.c b/target/i386/sev.c index ef2e592ca76..e84e4395a53 100644 --- a/target/i386/sev.c +++ b/target/i386/sev.c @@ -997,6 +997,7 @@ sev_snp_launch_finish(SevCommonState *sev_common) exit(1); } =20 + kvm_mark_guest_state_protected(); sev_set_guest_state(sev_common, SEV_STATE_RUNNING); =20 /* add migration blocker */ --=20 2.45.1