From nobody Mon Feb 9 13:02:58 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 8212827F163 for ; Tue, 13 Jan 2026 00:30:45 +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=1768264246; cv=none; b=iM3m6/3SQnemDz9fB0ibRuKJoyrLR+LtV/DOVs39LKV0BDS9y2n+PGvbx8zAxJhONOr2st0e08oez4CL7IIKYLpGRNeqjsa4xMDvy2pA5K7R3YZQNWXyVOQMt6bmyxZBJZSB0Hz52EVO8Unq+oClkyn7xmklXbvDUjx+V+5kyfo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768264246; c=relaxed/simple; bh=8ohubJfSSIGOHbF9QvJ9OM9WGWtPjCtGiMvy3iiTUfs=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=FThJoDbowyMuGhb/C1EvxRDP3GxjhaX8skJACdqpVSkdX/uuoKwCODPnEIUVU79VfPsFOxDpjf3ZgAsHCGnd/RBf3SELD/fVrBHGQYudcx5AzSfQ2eGyZZnTR+xvV9crZuX4xM0NxXbGU348EaVA8qN3NzaOETdj/cK771ZYcC0= 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=bKOIwGp5; 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="bKOIwGp5" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-2a13cd9a784so61731715ad.2 for ; Mon, 12 Jan 2026 16:30:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1768264245; x=1768869045; 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=V759ctxKOPBWxlGUqocasSXfPjVLuxnctmfzspXRRJ4=; b=bKOIwGp58DVDRdFew+B9JNZ+jwgY7ie8iBpSQUgybMS0ISyy18eVoLfU7yy0fb+ij5 txlI6O7+uXKUk3XrEdf+SrNdzW7n2AtEDRRTtFrlDtwD5A8gnjG/5lOAy/TR8QHT5Npb oXCOac7H2VR3tuVDLqW+AAyr2KE2HGnwdN6+1W+f4fZOtVZa6FLyiP++V8J3gXn6m7fW QKel6/z5neeF2u3PA6fc/r5/qQR3q5h1175L+Cn8zFrbD1UH/1q2mvnO903pYrfO/M1c SiwlDW8KyZBhgBV+4LRGY1dcC61Xf4gWegt2/DHwJd2041ADHT00oMyo4NjadhzOm1bT xdlg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768264245; x=1768869045; 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=V759ctxKOPBWxlGUqocasSXfPjVLuxnctmfzspXRRJ4=; b=Q4+m7eb9O2T8+fQ/hOebHxwOWVn3FZHW4lkzYQxExiazXcOQNvE0tnf4rovZcae0Kd /BHYWMqD6ZQYIFGn2+8Qt5RkBSCtx9os/54MeEy32SE9vhNFvQ8gCnwHE1khlpZdzAY7 gfgw5wN8/lH7wgd5OMILO9NuFftfb+gBe6CefK64+Ff/CC/uC0KwtXZlKvW8M1ojg6VZ 2fHW09w+Qcr/doiLG6hhE+EY4M7BPOmsSyLEcIWivSjFZ7W/g3eqwD67BWppC6dMpuP2 NEag7eX/rIsEF1e/5Moh0Nlgv56fykrdLI7xheKcDbKO27SJxNTXWMrh7w4FRTszW3tt Hb8A== X-Forwarded-Encrypted: i=1; AJvYcCV8Uwwcy+EZCUi0hco5lpD9/q2ga+KpneNwV3OYW8HnsPwzUvgBU6enBSdT7kiWGZCAdMjkEwTWKRYg+p4=@vger.kernel.org X-Gm-Message-State: AOJu0Yz8EOvfUZ4m3Za2IJ+t0Su0Gu+DXbfcnxF87i+5iEk29B50Aty6 gr17BUKOboNZRXydhSFTGh4ZOeWEoNC+3iWdWa3nWZZ3KT5+k1ljdvZ1HDK7az2car2Fr+yvsPX jxmm0q2xCcRhP5g== X-Google-Smtp-Source: AGHT+IG18O1vEYIIlSpSnJ0FYZsqsE17F4nPDlHh9RJI1lHPIQGjp9YKBIaGBb4woEZ+NfAfrwtFxg7I+F1J5w== X-Received: from plly13.prod.google.com ([2002:a17:902:7c8d:b0:295:16a7:a285]) (user=jmattson job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:46cc:b0:2a2:d2e8:9f2d with SMTP id d9443c01a7336-2a3ee4ab671mr201515325ad.48.1768264244752; Mon, 12 Jan 2026 16:30:44 -0800 (PST) Date: Mon, 12 Jan 2026 16:30:01 -0800 In-Reply-To: <20260113003016.3511895-1-jmattson@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260113003016.3511895-1-jmattson@google.com> X-Mailer: git-send-email 2.52.0.457.g6b5491de43-goog Message-ID: <20260113003016.3511895-7-jmattson@google.com> Subject: [PATCH 06/10] 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 , Joerg Roedel , Avi Kivity , Alexander Graf , "=?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?=" , David Hildenbrand , Cathy Avery , 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" 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." 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 ad9272aae908..501102625f69 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) @@ -1911,7 +1917,7 @@ 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