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Berrange" , Eduardo Habkost , Eric Blake , Markus Armbruster , Marcelo Tosatti , Zhao Liu , Nikunj A Dadhania , Tom Lendacky , Michael Roth , Neeraj Upadhyay , Roy Hopkins , Ketan Chaturvedi Subject: [RFC PATCH 5/7] target/i386: SEV: Add support for enabling Secure TSC SEV feature Date: Thu, 11 Sep 2025 17:24:24 +0530 Message-ID: <4c5ecb5835d8600e1b7b30fba2e36e1163b8da83.1757589490.git.naveen@kernel.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: References: 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=2600:3c0a:e001:78e:0:1991:8:25; envelope-from=naveen@kernel.org; helo=sea.source.kernel.org 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, SPF_HELO_NONE=0.001, T_SPF_TEMPERROR=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 @kernel.org) X-ZM-MESSAGEID: 1757591963871116600 Content-Type: text/plain; charset="utf-8" Add support for enabling Secure TSC VMSA SEV feature in SEV-SNP guests through a new "secure-tsc" boolean property on SEV-SNP guest objects. Sample command-line: -machine q35,confidential-guest-support=3Dsev0 \ -object sev-snp-guest,id=3Dsev0,cbitpos=3D51,reduced-phys-bits=3D1,secure= -tsc=3Don Co-developed-by: Ketan Chaturvedi Signed-off-by: Ketan Chaturvedi Co-developed-by: Nikunj A Dadhania Signed-off-by: Nikunj A Dadhania Signed-off-by: Naveen N Rao (AMD) --- target/i386/sev.h | 1 + target/i386/sev.c | 13 +++++++++++++ qapi/qom.json | 5 ++++- 3 files changed, 18 insertions(+), 1 deletion(-) diff --git a/target/i386/sev.h b/target/i386/sev.h index 8e09b2ce1976..87e73034ad15 100644 --- a/target/i386/sev.h +++ b/target/i386/sev.h @@ -46,6 +46,7 @@ bool sev_snp_enabled(void); =20 #define SVM_SEV_FEAT_SNP_ACTIVE BIT(0) #define SVM_SEV_FEAT_DEBUG_SWAP BIT(5) +#define SVM_SEV_FEAT_SECURE_TSC BIT(9) =20 typedef struct SevKernelLoaderContext { char *setup_data; diff --git a/target/i386/sev.c b/target/i386/sev.c index 3063ad2d077a..8f88df19a408 100644 --- a/target/i386/sev.c +++ b/target/i386/sev.c @@ -3117,6 +3117,16 @@ sev_snp_guest_set_host_data(Object *obj, const char = *value, Error **errp) memcpy(finish->host_data, blob, len); } =20 +static bool sev_snp_guest_get_secure_tsc(Object *obj, Error **errp) +{ + return is_sev_feature_set(SEV_COMMON(obj), SVM_SEV_FEAT_SECURE_TSC); +} + +static void sev_snp_guest_set_secure_tsc(Object *obj, bool value, Error **= errp) +{ + sev_set_feature(SEV_COMMON(obj), SVM_SEV_FEAT_SECURE_TSC, value); +} + static void sev_snp_guest_class_init(ObjectClass *oc, const void *data) { @@ -3152,6 +3162,9 @@ sev_snp_guest_class_init(ObjectClass *oc, const void = *data) object_class_property_add_str(oc, "host-data", sev_snp_guest_get_host_data, sev_snp_guest_set_host_data); + object_class_property_add_bool(oc, "secure-tsc", + sev_snp_guest_get_secure_tsc, + sev_snp_guest_set_secure_tsc); } =20 static void diff --git a/qapi/qom.json b/qapi/qom.json index 71cd8ad588b5..b05a475ef499 100644 --- a/qapi/qom.json +++ b/qapi/qom.json @@ -1100,6 +1100,8 @@ # firmware. Set this to true to disable the use of VCEK. # (default: false) (since: 9.1) # +# @secure-tsc: enable Secure TSC (default: false) (since 10.2) +# # Since: 9.1 ## { 'struct': 'SevSnpGuestProperties', @@ -1111,7 +1113,8 @@ '*id-auth': 'str', '*author-key-enabled': 'bool', '*host-data': 'str', - '*vcek-disabled': 'bool' } } + '*vcek-disabled': 'bool', + '*secure-tsc': 'bool' } } =20 ## # @TdxGuestProperties: --=20 2.50.1