From nobody Thu Apr 2 01:53:34 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 F37F83A4528 for ; Fri, 27 Mar 2026 23:40:39 +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=1774654842; cv=none; b=cQe/TrDFuUjEQw0xxWx1d3YMb8VPVLdt/jjILWqXoRICa8KTTC77YlJXzXRvmWvQg+NzPgLPljwrfvba2KYXaHTJtAdF/+w1LpaocfjNg6+ryAMuv2eYxXwhjE2lI5F6Acijk5jq2vtuh5Asu0hW6rF+AGMPDcm6geVRpT5OVm8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774654842; c=relaxed/simple; bh=JZ6+GCnob6DoER6tsgVX1H+2aBiZ/Ru6GqazViOYorE=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=tGzMU6oAK0+s4Wx+AuVpq/g0iCQ2lqcVuKrdKl2GuJc++ylt8SAFb0kjYE+xfvghMu7z+2xuR0GbC9K/58lXKR7lhT+JvbyGoVNTn1nQRxbsW1vu92nzvaxzC44Z92Y6kDLqqEjVnIFk15gVysaAlDe24Jccum4GGuhrs3V06Oc= 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=qpIhd2O2; 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="qpIhd2O2" Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-2b0b0aae381so32994675ad.2 for ; Fri, 27 Mar 2026 16:40:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1774654839; x=1775259639; 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=/5S/h4cOpTQz2572kh2nJElR+n8F1U4MUPv9k7NHcKE=; b=qpIhd2O2L0zS4SJogUKVUPAZmgD8tzPVNiNC+3yeI9nHH9s6V7izgeSmbBI6rmI3b0 SiyN0AQbkxmiohOC0qJc6FwRiBnGa6AQ0BOAuKcZWK7H998U/Uw1F7htI7DqTvvC7wkv 73t04DeGuEpszXB9Ja7g5WGf/DSAPqhe0X3BevdtS+8uv03kWkzTg8P6sUZIGaVJEQvr cH/tRMPADU77jv9xtqJi9S49ekbzpfLQdFapSwob7A0OZihz6yTEPz7JOMs36hMJx9xh xbg2m+kK9G6ljCOx9+eA5X6tajDUEVmDbY8Re+0MhO6L61kmRWXzsUJLnRapIde4BZsO nWfg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774654839; x=1775259639; 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=/5S/h4cOpTQz2572kh2nJElR+n8F1U4MUPv9k7NHcKE=; b=ipsXNvSBX8nBOQtYx+agk15bMyOpkDeIjK5U3ocjzP0kMzI7teZLX5VI4jkFK1GbiO 86Nj2lOw2TdF2ozkkJq071w2IwC9d9FzWeG7K+oqfCy903Zg7kuRosQJN6NFueJI83J3 b8B13VfMB9iid2f6FBH9F4odmTubVy7rCqhhVkZb+RhcgreAwloLNIBnQL/fe64soJEV GLfFwloOiShwS1YZaB8ndaJVVk9cYwIpPqmv7xfSqmkunYBQD3O+j+2zazSCe7K8krqs eLLGndlX8B82rydioGxgr8L3yjqMveRc5OY2GirCHCQ1jd80fwB2/8XDFFcch4t6VtPV kDlw== X-Forwarded-Encrypted: i=1; AJvYcCVXHsIAmhetj6vIsf3wf5G0+ctEisN89Q/p5qOBE5vk29/QOFSWpM4yeudFLjsvlPF7w3Vz792KYtrECYE=@vger.kernel.org X-Gm-Message-State: AOJu0YzXv4kysV1ExjZ0s1y/knd8QizemE3aw690oEeAxD/rl0s2tg8d hUKPII54eC3Zg81qmfywyljFuO7vwDIAjT9AqjkptF2F9UnytrvuAKxLY4cRBUlW0xwlsel0wTb 1KkjbAoYZ2Cp3FA== X-Received: from plge14.prod.google.com ([2002:a17:902:cf4e:b0:2b0:5cd7:c89a]) (user=jmattson job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:2405:b0:2b0:ac1e:9737 with SMTP id d9443c01a7336-2b0cdc3dabcmr45964875ad.12.1774654838782; Fri, 27 Mar 2026 16:40:38 -0700 (PDT) Date: Fri, 27 Mar 2026 16:40:13 -0700 In-Reply-To: <20260327234023.2659476-1-jmattson@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260327234023.2659476-1-jmattson@google.com> X-Mailer: git-send-email 2.53.0.1018.g2bb0e51243-goog Message-ID: <20260327234023.2659476-7-jmattson@google.com> Subject: [PATCH v7 6/9] KVM: x86: nSVM: Save gPAT to vmcb12.g_pat on VMEXIT From: Jim Mattson To: Paolo Bonzini , Jonathan Corbet , Shuah Khan , Sean Christopherson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Yosry Ahmed Cc: Jim Mattson Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" According to the APM volume 3 pseudo-code for "VMRUN," when nested paging is enabled in the vmcb, the guest PAT register (gPAT) is saved to the vmcb on emulated VMEXIT. When KVM_X86_QUIRK_NESTED_SVM_SHARED_PAT is disabled and the vCPU is in guest mode with nested NPT enabled, save the vmcb02 g_pat field to the vmcb12 g_pat field on emulated VMEXIT. Fixes: 15038e147247 ("KVM: SVM: obey guest PAT") Signed-off-by: Jim Mattson --- arch/x86/kvm/svm/nested.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index ccc556eb4d2f..add57f2a2d9f 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -1248,6 +1248,9 @@ static int nested_svm_vmexit_update_vmcb12(struct kvm= _vcpu *vcpu) vmcb12->save.dr6 =3D svm->vcpu.arch.dr6; vmcb12->save.cpl =3D vmcb02->save.cpl; =20 + if (l2_has_separate_pat(svm)) + vmcb12->save.g_pat =3D vmcb02->save.g_pat; + if (guest_cpu_cap_has(vcpu, X86_FEATURE_SHSTK)) { vmcb12->save.s_cet =3D vmcb02->save.s_cet; vmcb12->save.isst_addr =3D vmcb02->save.isst_addr; --=20 2.53.0.1018.g2bb0e51243-goog