From nobody Sun Feb 8 14:51:18 2026 Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) (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 05C50330332 for ; Thu, 15 Jan 2026 23:22:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768519339; cv=none; b=ujj2vmrSvMOUQ04hwKACHTTQap/HuOoQIbGDPvd55TreDwWJJGIvEJgbMZzGmlu+zr8LvoejgUMH3tNWHS7s0k3PK5LK0CEOmwE55LbvLwtHZvHGdYRE2uF6eCHcNmDLgemNp6jxtav4kVCJCD+JKqsSEoA9XpKS49BQ30POQr8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768519339; c=relaxed/simple; bh=uwL+q/W1CxUvgMFsliajMlQsLTrx9NGxQZcgHZ24XHE=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=q2LaNRL24RvKmomVM5az0vcIKX42F1FGk5wrnyosCgzGaTcTIiwESFELj3VJrhg/TG0dspuDD7MyyI7s4bEMw/kwn3ottI5SLefhAe+wxydw6q2/hdO4ZD5LYCidwy30JkAp16EKzcOCxDhWaXXefsc0DmVPVswqCIXvXN/s1xY= 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=tWSzmM15; arc=none smtp.client-ip=209.85.214.201 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--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="tWSzmM15" Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-2a0dabc192eso14095615ad.0 for ; Thu, 15 Jan 2026 15:22:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1768519336; x=1769124136; 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=j2a2OqxtfCuKT3wr2Ja9hUv7m6j011UQrkURc2LP8Lw=; b=tWSzmM15nVpgOav07acxwYd9ASDYHeLi6Z1oStsJmDbSzzBlqpOQkXTvrGKvROJCTG Icj2S2RVZew2E7g0pNmT+2hTrZuad95zmS0N/+Ml+cwejaBq8iZBrU/LUDo0fqjac62s ZuUjETsuGnHtppJ0DfCV16GigSteeQUmdzIcP3zq7LdYDBb3MF9bK+YLIdQ5V5s64lj5 7wZnWBJ4saJeNwhDlqDtPAHucsWliTXcJtnqAU0guC2HdLwDDeCe2yCyTrB1NyC2+vqK THkRfud+h/aDvvhjpEFruiWX+RRawRoWrnSV5xWVjhhV8dIQJeBvt1cQkEq71JRwe6l9 gyYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768519336; x=1769124136; 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=j2a2OqxtfCuKT3wr2Ja9hUv7m6j011UQrkURc2LP8Lw=; b=Ud4VjZIFfEgVcqfHRYd0Tkp23YYd1pAM23csuVeKggvbreeo93YVhRY1jnbQgFIl6v 7K0qMf9MXCPQYcZuWA1aSycIJ7piFTLJZB+hfqCr7j0gmNR3Po+0jN7+FqSNmUpEzQ6n vmnf413VZ0v4Xd8PvRelMwk+uvOdT0JOPIHs3OY6aUDZaQe5JqfHg1L7PufQ6IL1YZLq HR+Tng4foS8h5FbpZUFVcrxVIyeW81MP1zH2lbZo0ogv9YTx/X34SQF5UcBmLkjWNYS9 tOoZP7pbd8/jdeXFTTCiTsiM26Fgm+UhjqhvmYjrgMRFwVZLyN0B2RvQhc//ElZ1PmZX R7ag== X-Forwarded-Encrypted: i=1; AJvYcCV9NDV0SRu57Xbj94eT3YWgmvcmXA6zjaCz6aoqbW4LsWMM0rviPioHB85YPEnglKMYJR86ZwLOoHMcUyc=@vger.kernel.org X-Gm-Message-State: AOJu0YydKWeadwhNEkQaP1cOCDUTStTDJdPPPEQW/XbUb4o8f5C6u9cs YzRiA75JpNg2M/Ntru1Vwec6ojVzzBks4GeBbkvpXHgIA1TpPA1UrbLFECu/3gbD+MoENceyp6d luCpKIpXvLTFaeA== X-Received: from plbmp7.prod.google.com ([2002:a17:902:fd07:b0:29f:2ec2:58b]) (user=jmattson job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:1a2e:b0:2a1:1f28:d7ee with SMTP id d9443c01a7336-2a7189737e7mr6780315ad.57.1768519336400; Thu, 15 Jan 2026 15:22:16 -0800 (PST) Date: Thu, 15 Jan 2026 15:21:42 -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: <20260115232154.3021475-4-jmattson@google.com> Subject: [PATCH v2 3/8] KVM: x86: nSVM: Add validity check for vmcb12 g_pat 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" Add a validity check for g_pat, so that when nested paging is enabled for vmcb12, an invalid g_pat causes an immediate VMEXIT with exit code VMEXIT_INVALID, as specified in the APM, volume 2: "Nested Paging and VMRUN/VMEXIT." Update the signature of __nested_vmcb_check_save() to include a pointer to a struct vmcb_ctrl_area_cached, since the g_pat validity check depend on the nested paging control bit. Fixes: 3d6368ef580a ("KVM: SVM: Add VMRUN handler") Signed-off-by: Jim Mattson --- arch/x86/kvm/svm/nested.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index 07a57a43fc3b..e65291434be9 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -369,7 +369,8 @@ static bool __nested_vmcb_check_controls(struct kvm_vcp= u *vcpu, =20 /* Common checks that apply to both L1 and L2 state. */ static bool __nested_vmcb_check_save(struct kvm_vcpu *vcpu, - struct vmcb_save_area_cached *save) + struct vmcb_save_area_cached *save, + struct vmcb_ctrl_area_cached *control) { if (CC(!(save->efer & EFER_SVME))) return false; @@ -400,6 +401,10 @@ static bool __nested_vmcb_check_save(struct kvm_vcpu *= vcpu, if (CC(!kvm_valid_efer(vcpu, save->efer))) return false; =20 + if (CC((control->nested_ctl & SVM_NESTED_CTL_NP_ENABLE) && + npt_enabled && !kvm_pat_valid(save->g_pat))) + return false; + return true; } =20 @@ -407,8 +412,9 @@ static bool nested_vmcb_check_save(struct kvm_vcpu *vcp= u) { struct vcpu_svm *svm =3D to_svm(vcpu); struct vmcb_save_area_cached *save =3D &svm->nested.save; + struct vmcb_ctrl_area_cached *ctl =3D &svm->nested.ctl; =20 - return __nested_vmcb_check_save(vcpu, save); + return __nested_vmcb_check_save(vcpu, save, ctl); } =20 static bool nested_vmcb_check_controls(struct kvm_vcpu *vcpu) @@ -1892,7 +1898,7 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu, if (!(save->cr0 & X86_CR0_PG) || !(save->cr0 & X86_CR0_PE) || (save->rflags & X86_EFLAGS_VM) || - !__nested_vmcb_check_save(vcpu, &save_cached)) + !__nested_vmcb_check_save(vcpu, &save_cached, &ctl_cached)) goto out_free; =20 =20 --=20 2.52.0.457.g6b5491de43-goog