From nobody Mon Feb 9 06:24:28 2026 Received: from mail-pf1-f201.google.com (mail-pf1-f201.google.com [209.85.210.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 035CD13DB8C for ; Tue, 23 Apr 2024 16:53:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713891216; cv=none; b=cZEBKujpTG2+l+kENMnzlu2+F3ItKf8FliwYgxVPVVT6XOj2/GsrSx50cMYP8Mf+rPzWa0HyQCHtZlvBTVsW1JPpBxijmK1XSUrUEBVHJVjyLYo1gGFtIv/2xvvTsyYaffNOvxwtBVe9G7LtrgNcMuIITyGu2bHo4X0qLL+qyaw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713891216; c=relaxed/simple; bh=ub/c4lMzNuQE/ASob0hO2P7pr3tW5fJO73ybbxmtQhA=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=lkuQMXuS8pPoH308bIg5Hiwy0SF75+M1bazns1uSc9DmkE0OqZOJ+iz6kE+YFEe/nMBqZPc7lScNpFZwwtwbxVv1a/QQVd8gnGvFfDTCG7J+kn7XFv75818JiDIdXmGY/OyE6h4/f0cKPGPAZ5fisFka85nvGIvjrRCDilCyvok= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=XgZ44Gix; arc=none smtp.client-ip=209.85.210.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="XgZ44Gix" Received: by mail-pf1-f201.google.com with SMTP id d2e1a72fcca58-6ed2f4e685bso36613b3a.0 for ; Tue, 23 Apr 2024 09:53:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1713891214; x=1714496014; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=vs27nCM79m201+PPivEr2AY28j47w3WHEEMcLDKrspA=; b=XgZ44GixJQ56Rr1DZ8+JUONi1f4avXxmyBl2ogq4Me4fhOEAZxoCd+3MCGKyF/B26c dJ4Y1zPD17A5Tfpeyr5Beuk+DUmZFsmBunhpd4SOM2DPRsArfxlVd8NxxqXGZBYJdymT yolZhpjMscF0OYTyWidp6Goj/Jvmzl9V4xtupqPrKRy94IsX4DehR7wj8t7NxM4dM7fS 2QIvN7h9Tm+baWyNRrNYHNiECgVvqC55mU7xocTTLC6DKzm8uNMOd9LtH1E3a4wwsOxV qDpRJqSdttdlNRUokduMT4td83RjlEPIRpaaFmDSBlqxNtMSfvxoKeMB1cKbkqS2mFZk Hc0Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1713891214; x=1714496014; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=vs27nCM79m201+PPivEr2AY28j47w3WHEEMcLDKrspA=; b=CiTWqobrYCG+PdiOranhidJHOmHt+oaToC5c8nOHRbcOv/1hwYiv+hKbLor3ostBNW Tj+llvYdUGYZuVfCg6hmnai9zImUxBv45I/O+gshY3/AezFAAYzU+Wbg+tAhoQjYnL2H nNPyCBWSHpc7yMB7FFd2R6YI6rQAhjIHqhWXeEbAFac0dQfNYVnerLQDrWlbXxSJoZkC onV6uP6Lc2xcgySgQsZv9RifjJejIAtdrkw//DQ8k8/xXg+nuqeg81I2R9g863B1Muz6 jJTqM5ZTqq0mH42aC41emJ77sqyHH+bZVbPfy6xCuj8b6/fx3v/HbHzjj/d+xkHEpzRj ABYg== X-Forwarded-Encrypted: i=1; AJvYcCXalUmtI+lXGP6U7ITORrbslABMfXty5flTZIHr0SD7+5ICLhb6PK71ZowvmzNXguM0EhN+NTxoInnmxt3Kf1SizgPGaRApQdd6q2Hr X-Gm-Message-State: AOJu0YxXATa7XWYNqgKokACPEid5IkZH4Ji6vxVYJHqbkW0R5GXxnObj c5mXJyH1pvEgfIOzIHocvGmXAlcnjCc7rsCc/2P12ZRiZ0g9DUll+D58cUZfvJmQYzhQc7I6/Pf 0Yw== X-Google-Smtp-Source: AGHT+IHHss4tWuFp3utLNINOqa+jKnoNwBJ+RlJYWs9fS6z+DNT3QK/uQRUw/WQrJokPWQezfnz2mAbl10I= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:6a00:4ba4:b0:6ea:e009:1815 with SMTP id kt4-20020a056a004ba400b006eae0091815mr33967pfb.3.1713891214344; Tue, 23 Apr 2024 09:53:34 -0700 (PDT) Reply-To: Sean Christopherson Date: Tue, 23 Apr 2024 09:53:27 -0700 In-Reply-To: <20240423165328.2853870-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240423165328.2853870-1-seanjc@google.com> X-Mailer: git-send-email 2.44.0.769.g3c40516874-goog Message-ID: <20240423165328.2853870-3-seanjc@google.com> Subject: [PATCH 2/3] KVM: x86: Fully re-initialize supported_mce_cap on vendor module load From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Effectively reset supported_mce_cap on vendor module load to ensure that capabilities aren't unintentionally preserved across module reload, e.g. if kvm-intel.ko added a module param to control LMCE support, or if someone somehow managed to load a vendor module that doesn't support LMCE after loading and unloading kvm-intel.ko. Practically speaking, this bug is a non-issue as kvm-intel.ko doesn't have a module param for LMCE, and there is no system in the world that supports both kvm-intel.ko and kvm-amd.ko. Fixes: c45dcc71b794 ("KVM: VMX: enable guest access to LMCE related MSRs") Signed-off-by: Sean Christopherson --- arch/x86/kvm/x86.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index a65a1012d878..44ce187bad89 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -92,9 +92,7 @@ #define MAX_IO_MSRS 256 #define KVM_MAX_MCE_BANKS 32 =20 -struct kvm_caps kvm_caps __read_mostly =3D { - .supported_mce_cap =3D MCG_CTL_P | MCG_SER_P, -}; +struct kvm_caps kvm_caps __read_mostly; EXPORT_SYMBOL_GPL(kvm_caps); =20 #define ERR_PTR_USR(e) ((void __user *)ERR_PTR(e)) @@ -9776,6 +9774,7 @@ int kvm_x86_vendor_init(struct kvm_x86_init_ops *ops) goto out_free_percpu; =20 kvm_caps.supported_vm_types =3D BIT(KVM_X86_DEFAULT_VM); + kvm_caps.supported_mce_cap =3D MCG_CTL_P | MCG_SER_P; =20 if (boot_cpu_has(X86_FEATURE_XSAVE)) { host_xcr0 =3D xgetbv(XCR_XFEATURE_ENABLED_MASK); --=20 2.44.0.769.g3c40516874-goog