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AJvYcCWEQ5lMELySa5Ls5j4RSozENyYOmOpiOKZNk9OLrgq0RjgRgArkEQv0xxpKJeGWu5hfgaiALDzWP+M=@lists.xenproject.org X-Gm-Message-State: AOJu0YztioBU/Tw3TsPVdvvVBwT9AVEMPdNobpkn6gKou74gh9whY0SU XGQKDpr3/R+U/oRCnnvGDlrk2wGwMnb0MRxSJhVUhduekj3zftVpXSqXui9sgpv2eKHVECE+1lp G2w== X-Google-Smtp-Source: AGHT+IFmgEsUJJ1z3bRk5Nf8mtm9mdRWiQdO+4qbvCwBd/hyjI3jP5eNnlt+3d6bfd4x/QDsZrTqSfxiFQY= X-Received: from pjbsw3.prod.google.com ([2002:a17:90b:2c83:b0:2fa:15aa:4d2b]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:56cc:b0:2f1:2fa5:1924 with SMTP id 98e67ed59e1d1-2fe7e39f2afmr7133368a91.26.1740622749803; Wed, 26 Feb 2025 18:19:09 -0800 (PST) Reply-To: Sean Christopherson Date: Wed, 26 Feb 2025 18:18:20 -0800 In-Reply-To: <20250227021855.3257188-1-seanjc@google.com> Mime-Version: 1.0 References: <20250227021855.3257188-1-seanjc@google.com> X-Mailer: git-send-email 2.48.1.711.g2feabab25a-goog Message-ID: <20250227021855.3257188-5-seanjc@google.com> Subject: [PATCH v2 04/38] x86/sev: Mark TSC as reliable when configuring Secure TSC From: Sean Christopherson To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "Kirill A. Shutemov" , Paolo Bonzini , Sean Christopherson , Juergen Gross , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Ajay Kaher , Jan Kiszka , Andy Lutomirski , Peter Zijlstra , Daniel Lezcano , John Stultz Cc: linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, kvm@vger.kernel.org, virtualization@lists.linux.dev, linux-hyperv@vger.kernel.org, xen-devel@lists.xenproject.org, Tom Lendacky , Nikunj A Dadhania X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1740622803436019000 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Move the code to mark the TSC as reliable from sme_early_init() to snp_secure_tsc_init(). The only reader of TSC_RELIABLE is the aptly named check_system_tsc_reliable(), which runs in tsc_init(), i.e. after snp_secure_tsc_init(). This will allow consolidating the handling of TSC_KNOWN_FREQ and TSC_RELIABLE when overriding the TSC calibration routine. Cc: Tom Lendacky Reviewed-by: Nikunj A Dadhania Signed-off-by: Sean Christopherson --- arch/x86/coco/sev/core.c | 2 ++ arch/x86/mm/mem_encrypt_amd.c | 3 --- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c index 684cef70edc1..e6ce4ca72465 100644 --- a/arch/x86/coco/sev/core.c +++ b/arch/x86/coco/sev/core.c @@ -3288,6 +3288,8 @@ void __init snp_secure_tsc_init(void) return; =20 setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ); + setup_force_cpu_cap(X86_FEATURE_TSC_RELIABLE); + rdmsrl(MSR_AMD64_GUEST_TSC_FREQ, tsc_freq_mhz); snp_tsc_freq_khz =3D (unsigned long)(tsc_freq_mhz * 1000); =20 diff --git a/arch/x86/mm/mem_encrypt_amd.c b/arch/x86/mm/mem_encrypt_amd.c index b56c5c073003..774f9677458f 100644 --- a/arch/x86/mm/mem_encrypt_amd.c +++ b/arch/x86/mm/mem_encrypt_amd.c @@ -541,9 +541,6 @@ void __init sme_early_init(void) * kernel mapped. */ snp_update_svsm_ca(); - - if (sev_status & MSR_AMD64_SNP_SECURE_TSC) - setup_force_cpu_cap(X86_FEATURE_TSC_RELIABLE); } =20 void __init mem_encrypt_free_decrypted_mem(void) --=20 2.48.1.711.g2feabab25a-goog