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charset="utf-8" QEMU will currently automatically make use of the KVM_SEV_INIT2 API for initializing SEV and SEV-ES guests verses the older KVM_SEV_INIT/KVM_SEV_ES_INIT interfaces. However, the older interfaces will silently avoid sync'ing FPU/XSAVE state to the VMSA prior to encryption, thus relying on behavior and measurements that assume the related fields to be allow zero. With KVM_SEV_INIT2, this state is now synced into the VMSA, resulting in measurements changes and, theoretically, behaviorial changes, though the latter are unlikely to be seen in practice. To allow a smooth transition to the newer interface, while still providing a mechanism to maintain backward compatibility with VMs created using the older interfaces, provide a new command-line parameter: -object sev-guest,legacy-vm-type=3Dtrue,... and have it default to false. Signed-off-by: Michael Roth --- qapi/qom.json | 11 ++++++++++- target/i386/sev.c | 18 +++++++++++++++++- 2 files changed, 27 insertions(+), 2 deletions(-) diff --git a/qapi/qom.json b/qapi/qom.json index baae3a183f..8f2f75bde6 100644 --- a/qapi/qom.json +++ b/qapi/qom.json @@ -898,6 +898,14 @@ # designated guest firmware page for measured boot with -kernel # (default: false) (since 6.2) # +# @legacy-vm-type: Use legacy KVM_SEV_INIT KVM interface for creating the = VM. +# The newer KVM_SEV_INIT2 interface syncs additional vCPU +# state when initializing the VMSA structures, which will +# result in a different guest measurement. Set this to +# maintain compatibility with older QEMU or kernel versio= ns +# that rely on legacy KVM_SEV_INIT behavior. +# (default: false) (since 9.1) +# # Since: 2.12 ## { 'struct': 'SevGuestProperties', @@ -908,7 +916,8 @@ '*handle': 'uint32', '*cbitpos': 'uint32', 'reduced-phys-bits': 'uint32', - '*kernel-hashes': 'bool' } } + '*kernel-hashes': 'bool', + '*legacy-vm-type': 'bool' } } =20 ## # @ThreadContextProperties: diff --git a/target/i386/sev.c b/target/i386/sev.c index 9dab4060b8..f4ee317cb0 100644 --- a/target/i386/sev.c +++ b/target/i386/sev.c @@ -67,6 +67,7 @@ struct SevGuestState { uint32_t cbitpos; uint32_t reduced_phys_bits; bool kernel_hashes; + bool legacy_vm_type; =20 /* runtime state */ uint32_t handle; @@ -356,6 +357,16 @@ static void sev_guest_set_kernel_hashes(Object *obj, b= ool value, Error **errp) sev->kernel_hashes =3D value; } =20 +static bool sev_guest_get_legacy_vm_type(Object *obj, Error **errp) +{ + return SEV_GUEST(obj)->legacy_vm_type; +} + +static void sev_guest_set_legacy_vm_type(Object *obj, bool value, Error **= errp) +{ + SEV_GUEST(obj)->legacy_vm_type =3D value; +} + bool sev_enabled(void) { @@ -863,7 +874,7 @@ static int sev_kvm_type(X86ConfidentialGuest *cg) } =20 kvm_type =3D (sev->policy & SEV_POLICY_ES) ? KVM_X86_SEV_ES_VM : KVM_X= 86_SEV_VM; - if (kvm_is_vm_type_supported(kvm_type)) { + if (kvm_is_vm_type_supported(kvm_type) && !sev->legacy_vm_type) { sev->kvm_type =3D kvm_type; } else { sev->kvm_type =3D KVM_X86_DEFAULT_VM; @@ -1381,6 +1392,11 @@ sev_guest_class_init(ObjectClass *oc, void *data) sev_guest_set_kernel_hashes); object_class_property_set_description(oc, "kernel-hashes", "add kernel hashes to guest firmware for measured Linux boot"); + object_class_property_add_bool(oc, "legacy-vm-type", + sev_guest_get_legacy_vm_type, + sev_guest_set_legacy_vm_type); + object_class_property_set_description(oc, "legacy-vm-type", + "use legacy VM type to maintain measurement compatibility with= older QEMU or kernel versions."); } =20 static void --=20 2.25.1 From nobody Sun May 19 06:22:59 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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charset="utf-8" Define the 9.1 machine types and make them identical to 9.0 for now. This will be needed to add PC compat options for 9.1+ features. Signed-off-by: Michael Roth --- hw/i386/pc_piix.c | 12 +++++++++++- hw/i386/pc_q35.c | 11 ++++++++++- 2 files changed, 21 insertions(+), 2 deletions(-) diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c index 18ba076609..069414a1ac 100644 --- a/hw/i386/pc_piix.c +++ b/hw/i386/pc_piix.c @@ -513,13 +513,23 @@ static void pc_i440fx_machine_options(MachineClass *m) "Use a different south bridge than PI= IX3"); } =20 -static void pc_i440fx_9_0_machine_options(MachineClass *m) +static void pc_i440fx_9_1_machine_options(MachineClass *m) { pc_i440fx_machine_options(m); m->alias =3D "pc"; m->is_default =3D true; } =20 +DEFINE_I440FX_MACHINE(v9_1, "pc-i440fx-9.1", NULL, + pc_i440fx_9_1_machine_options); + +static void pc_i440fx_9_0_machine_options(MachineClass *m) +{ + pc_i440fx_machine_options(m); + m->alias =3D NULL; + m->is_default =3D false; +} + DEFINE_I440FX_MACHINE(v9_0, "pc-i440fx-9.0", NULL, pc_i440fx_9_0_machine_options); =20 diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c index 7f2d85df75..77d7f700a8 100644 --- a/hw/i386/pc_q35.c +++ b/hw/i386/pc_q35.c @@ -367,12 +367,21 @@ static void pc_q35_machine_options(MachineClass *m) pc_q35_compat_defaults, pc_q35_compat_defaults_len); } =20 -static void pc_q35_9_0_machine_options(MachineClass *m) +static void pc_q35_9_1_machine_options(MachineClass *m) { pc_q35_machine_options(m); m->alias =3D "q35"; } =20 +DEFINE_Q35_MACHINE(v9_1, "pc-q35-9.1", NULL, + pc_q35_9_1_machine_options); + +static void pc_q35_9_0_machine_options(MachineClass *m) +{ + pc_q35_machine_options(m); + m->alias =3D NULL; +} + DEFINE_Q35_MACHINE(v9_0, "pc-q35-9.0", NULL, pc_q35_9_0_machine_options); =20 --=20 2.25.1 From nobody Sun May 19 06:22:59 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1 dmarc=pass fromdomain=amd.com); dmarc=pass(p=quarantine dis=none) header.from=amd.com ARC-Seal: i=2; a=rsa-sha256; t=1712704184; cv=pass; d=zohomail.com; s=zohoarc; b=ZCszk0eZ1IdmBZqLmPhz8xybm8NZKDLdngZkmQNp7MilZGMMb4JJZqLLpNGv8YvgFaqqGOV9coetZ6bgmYAGhFg4aGY78GihBD4Hx9kU06bXlCSw3gC6bJvDxqaOOjyv+hyMIM4EXKL5C9OTPB8DzdZNyXq3fKBfZbU8kLyOAlw= ARC-Message-Signature: i=2; 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bh=ty2IOTc9gTBaJQ7l7S7OWQpXxYtZfDrbKLLcPhLIR9E=; b=akWmIXDKB4iGeRmfsUTia/N0GXivqVQzBAM2iShjQn5SqEiGOxAl3sEne66NX8/fJMt1gKupMENOEYy75+iRVS0SwjkaNIGjxsL1kbST5XfWNEDjw6o/gHAXFRl1DUd5ERXCOeeA/hEYuLIQX4NkrOxvh18XCGSWUOkzDMxhe/Y= X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; 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 (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C From: Michael Roth To: CC: , Paolo Bonzini , Tom Lendacky , Pankaj Gupta , Larry Dewey , Roy Hopkins Subject: [PATCH v1 3/3] hw/i386/sev: Use legacy SEV VM types for older machine types Date: Tue, 9 Apr 2024 18:07:43 -0500 Message-ID: <20240409230743.962513-4-michael.roth@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240409230743.962513-1-michael.roth@amd.com> References: <20240409230743.962513-1-michael.roth@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000FCC5:EE_|MN2PR12MB4126:EE_ X-MS-Office365-Filtering-Correlation-Id: db23a42b-9102-435f-b690-08dc58ea10bf X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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charset="utf-8" Newer 9.1 machine types will default to using the KVM_SEV_INIT2 API for creating SEV/SEV-ES going forward. However, this API results in guest measurement changes which are generally not expected for users of these older guest types and can cause disruption if they switch to a newer QEMU/kernel version. Avoid this by continuing to use the older KVM_SEV_INIT/KVM_SEV_ES_INIT APIs for older machine types. Signed-off-by: Michael Roth --- hw/i386/pc.c | 5 +++++ hw/i386/pc_piix.c | 1 + hw/i386/pc_q35.c | 1 + include/hw/i386/pc.h | 3 +++ target/i386/sev.c | 1 + 5 files changed, 11 insertions(+) diff --git a/hw/i386/pc.c b/hw/i386/pc.c index e80f02bef4..96bf90c17e 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -78,6 +78,11 @@ { "qemu64-" TYPE_X86_CPU, "model-id", "QEMU Virtual CPU version " v, }= ,\ { "athlon-" TYPE_X86_CPU, "model-id", "QEMU Virtual CPU version " v, }, =20 +GlobalProperty pc_compat_9_0[] =3D { + { "sev-guest", "legacy-vm-type", "true" }, +}; +const size_t pc_compat_9_0_len =3D G_N_ELEMENTS(pc_compat_9_0); + GlobalProperty pc_compat_8_2[] =3D {}; const size_t pc_compat_8_2_len =3D G_N_ELEMENTS(pc_compat_8_2); =20 diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c index 069414a1ac..0b7a9debab 100644 --- a/hw/i386/pc_piix.c +++ b/hw/i386/pc_piix.c @@ -528,6 +528,7 @@ static void pc_i440fx_9_0_machine_options(MachineClass = *m) pc_i440fx_machine_options(m); m->alias =3D NULL; m->is_default =3D false; + compat_props_add(m->compat_props, pc_compat_9_0, pc_compat_9_0_len); } =20 DEFINE_I440FX_MACHINE(v9_0, "pc-i440fx-9.0", NULL, diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c index 77d7f700a8..acb55fc787 100644 --- a/hw/i386/pc_q35.c +++ b/hw/i386/pc_q35.c @@ -380,6 +380,7 @@ static void pc_q35_9_0_machine_options(MachineClass *m) { pc_q35_machine_options(m); m->alias =3D NULL; + compat_props_add(m->compat_props, pc_compat_9_0, pc_compat_9_0_len); } =20 DEFINE_Q35_MACHINE(v9_0, "pc-q35-9.0", NULL, diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h index fb1d4106e5..e52290916c 100644 --- a/include/hw/i386/pc.h +++ b/include/hw/i386/pc.h @@ -199,6 +199,9 @@ void pc_system_parse_ovmf_flash(uint8_t *flash_ptr, siz= e_t flash_size); /* sgx.c */ void pc_machine_init_sgx_epc(PCMachineState *pcms); =20 +extern GlobalProperty pc_compat_9_0[]; +extern const size_t pc_compat_9_0_len; + extern GlobalProperty pc_compat_8_2[]; extern const size_t pc_compat_8_2_len; =20 diff --git a/target/i386/sev.c b/target/i386/sev.c index f4ee317cb0..d30b68c11e 100644 --- a/target/i386/sev.c +++ b/target/i386/sev.c @@ -1417,6 +1417,7 @@ sev_guest_instance_init(Object *obj) object_property_add_uint32_ptr(obj, "reduced-phys-bits", &sev->reduced_phys_bits, OBJ_PROP_FLAG_READWRITE); + object_apply_compat_props(obj); } =20 /* sev guest info */ --=20 2.25.1