From nobody Sun Feb 8 17:37:46 2026 Received: from mail-pl1-f202.google.com (mail-pl1-f202.google.com [209.85.214.202]) (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 7A34B3101B4 for ; Thu, 15 Jan 2026 23:22:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768519338; cv=none; b=H+LoryrHtOD53FI4MlVLidgmUggvzYqXLBBFrf+kgYojnX10GlbRzVjqvcb0v7D688m4950bfoiSXlzoOtxsjm9CQx16W4bNAkQ+oZsPrP2Ol1+QaNLEs/iUktvFNK30IxOuWdeyNompHRhIR/aybuoJMZ9HTHkt76TQzQbQly4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768519338; c=relaxed/simple; bh=RW48TPdvb5xAKUsQXmeyEK97Shn/whfhWqOquQdudkY=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=WDMh86hgawbGSgO4Vg3X9l7vr7GeSKCstD8DPN1nfUkBoJXza7EnV+gwqfD9cgyHGhDZzTK6Emt6sWm7LyjOp1fZBQDCZBs8+UCH0XEINjL17art+qN3BxGWI7+X8I0K11Kvme8E+XG3uwBtfZbHK0/prONjQAXsRWBWI5SXMo8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jmattson.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=Ar9iMgRm; arc=none smtp.client-ip=209.85.214.202 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--jmattson.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Ar9iMgRm" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-2a089575ab3so12338905ad.0 for ; Thu, 15 Jan 2026 15:22:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1768519335; x=1769124135; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=hfgEug5UPVe3ZZ5958Qf800gsqyZ1Jrc8uLtmlr2csE=; b=Ar9iMgRmnrh1Wc8H6dATOsRGGYYYd4CVfdMM+XOTV5Pj+epYwDPzORfcL7rrW2bxdI rNKd8qq2ga+qFKLeGEe+Tp4RC7YZlyVly6sgw4jlHh44cCHpf3EcPvnpipIzqSlHFtba OnQ2DjogB9TmJo0w/zBxqE3cWU/QE/jOUqAnYEmEx8t/Jvpu1Io2TYAfLSdeLl0uDEYl asVxCSh5lE9eNw/C8EyX0T0HqRf+H6a9JXHdE6m5qEvTMmKaJVKT1k9W2wsdb61YdChU wbfUjZH1CtTznDkqi0ktroCQYi2eYfUDpGMipfGgwktIvOTFZiao7gjx1SVEAoz5xZcS skOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768519335; x=1769124135; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=hfgEug5UPVe3ZZ5958Qf800gsqyZ1Jrc8uLtmlr2csE=; b=koiUZgBOLwHEks7aGMExVtigt/K6kW5RjJuvg5WbqaCuhiEnoWsGrjf7hFK+OcH2rt XG1+phblKv1NAYiPnDrnli0OUwIN43c2EKoBHEiIc3rdGci9n0uN7C5yALH3Ay4OVQDr KR27PK9R3Q9vei3QSNew8AqyBNTF3LE5c+8H1RAds+mw78rCFMGOrd9nhZbvkbYNciqP U0BtasmmgDt/WA8hfoP0fONAZka+QZtr7bqsBBy5n2pJR3xLnve/qfDI6EIZPJcJe2iD rWdjyCrmd6N9EmO6Y1b4ay9+TWz6v0DriRbYayBW/pqz++QlEcm+e5I1GrrPv5ytBH3W ZGDw== X-Forwarded-Encrypted: i=1; AJvYcCXtlYWlkIX53JtIC48WKGzCzwnnVGmzlEB88tEzjCO6Fun3Gw8+d9sWcB9TpH6oB1f8I06kIFPHI0fPzGo=@vger.kernel.org X-Gm-Message-State: AOJu0Yz9LyW2jrblADCmr5TUbhkafwHFJLyM6FW+b5iHV7R1vZYjrDcQ p0VXUGhMBdufz4GCPHuNCf0m94LJsMfOhHi+4pPmiyCUu3vVM0gg22nw2XKZrKabWy+Df/dMBLh sBxlUbcROr8H6lQ== X-Received: from pleo7.prod.google.com ([2002:a17:903:2107:b0:29f:1738:99f3]) (user=jmattson job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:22cb:b0:295:5da6:6011 with SMTP id d9443c01a7336-2a7174fa899mr10665615ad.11.1768519334810; Thu, 15 Jan 2026 15:22:14 -0800 (PST) Date: Thu, 15 Jan 2026 15:21:41 -0800 In-Reply-To: <20260115232154.3021475-1-jmattson@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260115232154.3021475-1-jmattson@google.com> X-Mailer: git-send-email 2.52.0.457.g6b5491de43-goog Message-ID: <20260115232154.3021475-3-jmattson@google.com> Subject: [PATCH v2 2/8] KVM: x86: nSVM: Cache g_pat in vmcb_save_area_cached From: Jim Mattson To: Sean Christopherson , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Shuah Khan , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Jim Mattson Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" To avoid TOCTTOU issues, all fields in the vmcb12 save area that are subject to validation must be copied to svm->nested.save prior to validation, since vmcb12 is writable by the guest. Add g_pat to this set in preparation for validting it. Fixes: 3d6368ef580a ("KVM: SVM: Add VMRUN handler") Signed-off-by: Jim Mattson Reviewed-by: Yosry Ahmed --- arch/x86/kvm/svm/nested.c | 2 ++ arch/x86/kvm/svm/svm.h | 1 + 2 files changed, 3 insertions(+) diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index f295a41ec659..07a57a43fc3b 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -506,6 +506,8 @@ static void __nested_copy_vmcb_save_to_cache(struct vmc= b_save_area_cached *to, =20 to->dr6 =3D from->dr6; to->dr7 =3D from->dr7; + + to->g_pat =3D from->g_pat; } =20 void nested_copy_vmcb_save_to_cache(struct vcpu_svm *svm, diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 7d28a739865f..39138378531e 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -145,6 +145,7 @@ struct vmcb_save_area_cached { u64 cr0; u64 dr7; u64 dr6; + u64 g_pat; }; =20 struct vmcb_ctrl_area_cached { --=20 2.52.0.457.g6b5491de43-goog