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Wed, 14 Dec 2022 14:07:02 -0600 From: Michael Roth To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH RFC v7 61/64] KVM: SVM: Make VMSAVE target area memory allocation SNP safe Date: Wed, 14 Dec 2022 13:40:53 -0600 Message-ID: <20221214194056.161492-62-michael.roth@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221214194056.161492-1-michael.roth@amd.com> References: <20221214194056.161492-1-michael.roth@amd.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT085:EE_|SA0PR12MB4590:EE_ X-MS-Office365-Filtering-Correlation-Id: 0cebb3d1-104b-47e1-3ac2-08dade0ec461 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Dec 2022 20:07:03.0398 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0cebb3d1-104b-47e1-3ac2-08dade0ec461 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT085.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4590 From: Ashish Kalra Implement a workaround for an SNP erratum where the CPU will incorrectly signal an RMP violation #PF if a hugepage (2mb or 1gb) collides with the RMP entry of the VMSAVE target page. When SEV-SNP is globally enabled, the CPU marks the VMSAVE target page as "InUse" while the VMSAVE instruction is executing. If another CPU writes to a different page in the same 2MB region while the VMSAVE is executing, the CPU will throw an RMP violation #PF. Use the snp safe generic allocator for allocating the VMSA target page which will ensure that the page returned is not a hugepage, as it is already being used for the allocating the VMCB, VMSA and AVIC backing page. Co-developed-by: Marc Orr Signed-off-by: Marc Orr Reported-by: Alper Gun Signed-off-by: Ashish Kalra Signed-off-by: Michael Roth --- arch/x86/kvm/svm/svm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 543261c87eb3..1d4a723d5def 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -653,7 +653,7 @@ static int svm_cpu_init(int cpu) int ret = -ENOMEM; memset(sd, 0, sizeof(struct svm_cpu_data)); - sd->save_area = alloc_page(GFP_KERNEL | __GFP_ZERO); + sd->save_area = snp_safe_alloc_page(NULL); if (!sd->save_area) return ret; -- 2.25.1