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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Oct 2023 20:03:08.9630 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7e616259-a969-48ba-6716-08dbc9cbecbf X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS2PEPF00003440.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7242 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" If kvm supports shadow stack, pass through shadow stack MSRs to improve guest performance. Signed-off-by: John Allen Reviewed-by: Maxim Levitsky --- arch/x86/kvm/svm/svm.c | 26 ++++++++++++++++++++++++++ arch/x86/kvm/svm/svm.h | 2 +- 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index e435e4fbadda..984e89d7a734 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -139,6 +139,13 @@ static const struct svm_direct_access_msrs { { .index =3D X2APIC_MSR(APIC_TMICT), .always =3D false }, { .index =3D X2APIC_MSR(APIC_TMCCT), .always =3D false }, { .index =3D X2APIC_MSR(APIC_TDCR), .always =3D false }, + { .index =3D MSR_IA32_U_CET, .always =3D false }, + { .index =3D MSR_IA32_S_CET, .always =3D false }, + { .index =3D MSR_IA32_INT_SSP_TAB, .always =3D false }, + { .index =3D MSR_IA32_PL0_SSP, .always =3D false }, + { .index =3D MSR_IA32_PL1_SSP, .always =3D false }, + { .index =3D MSR_IA32_PL2_SSP, .always =3D false }, + { .index =3D MSR_IA32_PL3_SSP, .always =3D false }, { .index =3D MSR_INVALID, .always =3D false }, }; =20 @@ -1225,6 +1232,25 @@ static inline void init_vmcb_after_set_cpuid(struct = kvm_vcpu *vcpu) set_msr_interception(vcpu, svm->msrpm, MSR_IA32_SYSENTER_EIP, 1, 1); set_msr_interception(vcpu, svm->msrpm, MSR_IA32_SYSENTER_ESP, 1, 1); } + + if (kvm_cpu_cap_has(X86_FEATURE_SHSTK)) { + bool shstk_enabled =3D guest_cpuid_has(vcpu, X86_FEATURE_SHSTK); + + set_msr_interception(vcpu, svm->msrpm, MSR_IA32_U_CET, + shstk_enabled, shstk_enabled); + set_msr_interception(vcpu, svm->msrpm, MSR_IA32_S_CET, + shstk_enabled, shstk_enabled); + set_msr_interception(vcpu, svm->msrpm, MSR_IA32_INT_SSP_TAB, + shstk_enabled, shstk_enabled); + set_msr_interception(vcpu, svm->msrpm, MSR_IA32_PL0_SSP, + shstk_enabled, shstk_enabled); + set_msr_interception(vcpu, svm->msrpm, MSR_IA32_PL1_SSP, + shstk_enabled, shstk_enabled); + set_msr_interception(vcpu, svm->msrpm, MSR_IA32_PL2_SSP, + shstk_enabled, shstk_enabled); + set_msr_interception(vcpu, svm->msrpm, MSR_IA32_PL3_SSP, + shstk_enabled, shstk_enabled); + } } =20 static void init_vmcb(struct kvm_vcpu *vcpu) diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index f41253958357..bdc39003b955 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -30,7 +30,7 @@ #define IOPM_SIZE PAGE_SIZE * 3 #define MSRPM_SIZE PAGE_SIZE * 2 =20 -#define MAX_DIRECT_ACCESS_MSRS 46 +#define MAX_DIRECT_ACCESS_MSRS 53 #define MSRPM_OFFSETS 32 extern u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly; extern bool npt_enabled; --=20 2.40.1