From nobody Fri Dec 19 21:49:02 2025 Received: from mail-pj1-f73.google.com (mail-pj1-f73.google.com [209.85.216.73]) (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 3A67230E0EB for ; Fri, 7 Nov 2025 20:12:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762546328; cv=none; b=Pj/GmpyMz45v99KR4sqlZt2Jf3HndTSls1z1zCuFucMa5rRPLAXpcekfCznmKfpol4K0TcSI4JUGlI04sODa4CwI8vYjQk1r0SAXreOztHrVkWi1uCiObor4cf+8X19b7PVHWzF4PTqqF/3CHjJKKNAV5YvIvKPvwfeOKCMbGIA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762546328; c=relaxed/simple; bh=0PSUXZdtAcAVckwW4lK0mGvQ71b1MKoWNaHJVsrSzZk=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=KAlJ9rbBYrUQaSsiUGSnLywu5gYK7u0MoqczIvG1Y/8HXdf5yXGUHbX64tuQsCG8tp1Gs7O1ZV2Z3iGmQ7U8QbO1YhdHeQjN0/tzqbXuu2jaUOgSWhauPIOfA00X30oiL8CIdLRNHxn+OeFdhvJjUHHOvqvy5Hfxpm6cYGU8Nn4= 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=HpZd5jDD; arc=none smtp.client-ip=209.85.216.73 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="HpZd5jDD" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-3416dc5754fso2019915a91.1 for ; Fri, 07 Nov 2025 12:12:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1762546325; x=1763151125; 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=V1c44yEBK31lRCe8Lbf69dQHnIbjaXo/fMdKgYC3v+E=; b=HpZd5jDDA7maAjugMbhW4c3/UfWEnnPik7iYt6wIqmVT5WZ+pirj7rWx/REWW3hlOv xisYn+tXSvmcUi2wM/ZQlfUDmphV08vt9aE/8ICLNK9AeQSwvfdcjPaeOPoyDfaF0+y/ bzsg+N2uid758X9xh9CgZrSSuGd82WjLf4ldpiaxXgiYGakla+OvW5SHqGGBDGqmGtP9 aQJ5eBaPXo/VtzfA88SMuV6h0oCRW1+6+RYsk7AHkfPp41ZlY6ffrJ99drrXzfIJxKua dKdT8cR8dwEahtBUvwAXj/DNr7a7pO33Pr1dtD8v1ry8t2W1SyzINkwQMjHUJ5RukYIH ZKYA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762546325; x=1763151125; 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=V1c44yEBK31lRCe8Lbf69dQHnIbjaXo/fMdKgYC3v+E=; b=ilS2GleHxspwdPt21gioXN5Hf5JmcAoRjGSgMDgW2dz/rKLkFrRbRKWewJhcj+Wmr6 e1bIQUDfC/R4gO1p0jxer3tJ6jltlosmcRdnMoeVdrfwMoDyjCxR+O39W1JSxWYGkflK w3FoXObbILYZu+KKDhIVVuJEVNsIxgQ6AJ4UUSCZrh8orT2tglI94UJJZ1ei9oiXH3iR RILAi0as6r/q6W/KcT4G2JoA6WwftpnJvhQjvpJwaTuEi8f3wjS7UVTWGAsoffgXseKf nhNEqvn2iYzwOTimXztYFuZZC1IErO+2yc99K0lvFctPH110u/3ox7z+fRxE2xwVlU2W WVtw== X-Forwarded-Encrypted: i=1; AJvYcCWvMc2dXUkfb6BNBPiMtww0JdthcmAxg+OzuvAXxtYzRXmNrYjOJZtnDyvJlCO4Lmkrl2JeBVPlMAZDhXg=@vger.kernel.org X-Gm-Message-State: AOJu0Yw2vpk2M5o0vGOjcVkPzAVx5f/9to1mOG5iJBFyc+siOC4LslF0 CJxxEhwXITiqrBCRDfsSOctKInhn35dU4z0DrPmbS2f8vQFgiwic3ix515O5crQPYr6wZsHMeTf niHXysihCKaJ7iA== X-Google-Smtp-Source: AGHT+IFmjsIKMoEWnsUYi/J8vax4CWimpYEJ50LiM8ewxXqIhiQY8LKKFNOWWpBuxiDjIkkZLdAnyBQIvKPkIA== X-Received: from pjbnc11.prod.google.com ([2002:a17:90b:37cb:b0:33b:ca21:e3e7]) (user=jmattson job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:3145:b0:343:688e:3252 with SMTP id 98e67ed59e1d1-3436cb89d6cmr561450a91.12.1762546325387; Fri, 07 Nov 2025 12:12:05 -0800 (PST) Date: Fri, 7 Nov 2025 12:11:28 -0800 In-Reply-To: <20251107201151.3303170-1-jmattson@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251107201151.3303170-1-jmattson@google.com> X-Mailer: git-send-email 2.51.2.1041.gc1ab5b90ca-goog Message-ID: <20251107201151.3303170-6-jmattson@google.com> Subject: [RFC PATCH 5/6] KVM: x86: nSVM: Add validity check for the 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" , Alexander Graf , Joerg Roedel , Avi Kivity , "=?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?=" , David Hildenbrand , kvm@vger.kernel.org, linux-kernel@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. Fixes: 3d6368ef580a ("KVM: SVM: Add VMRUN handler") Signed-off-by: Jim Mattson --- arch/x86/kvm/svm/nested.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index 6e48572e2bd7..43429399993c 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -336,6 +336,10 @@ static bool __nested_vmcb_check_controls(struct kvm_vc= pu *vcpu, if (CC((control->nested_ctl & SVM_NESTED_CTL_NP_ENABLE) && !npt_enabled)) return false; =20 + if (CC((control->nested_ctl & SVM_NESTED_CTL_NP_ENABLE) && + npt_enabled && !kvm_pat_valid(control->g_pat))) + return false; + if (CC(!nested_svm_check_bitmap_pa(vcpu, control->msrpm_base_pa, MSRPM_SIZE))) return false; --=20 2.51.2.1041.gc1ab5b90ca-goog