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Wed, 7 Apr 2021 18:30:28 +0000 From: Tom Lendacky To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org Cc: Paolo Bonzini , Jim Mattson , Joerg Roedel , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Borislav Petkov , Ingo Molnar , Thomas Gleixner , Brijesh Singh Subject: [PATCH] KVM: SVM: Make sure GHCB is mapped before updating Date: Wed, 7 Apr 2021 13:30:15 -0500 Message-Id: <03b349cb19b360d4c2bbeebdd171f99298082d28.1617820214.git.thomas.lendacky@amd.com> X-Mailer: git-send-email 2.31.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Originating-IP: [165.204.77.1] X-ClientProxiedBy: SN4PR0501CA0081.namprd05.prod.outlook.com (2603:10b6:803:22::19) To DM5PR12MB1355.namprd12.prod.outlook.com (2603:10b6:3:6e::7) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from tlendack-t1.amd.com (165.204.77.1) by SN4PR0501CA0081.namprd05.prod.outlook.com (2603:10b6:803:22::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4020.8 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?C8BOswUs00gn6dfMrJtEMrqNyvsZke5/h1ROEyqi/PLG0pNUyUD7ynXH2eqD?= =?us-ascii?Q?bbF1gSmI4u9XswsdFO3addk1w+h2giCXjdrQmpAnsWP2br/t4VaEIaO/ytoI?= =?us-ascii?Q?VApBk4+T7zMiYOJ/Sp1g1I9kzIDojR8br//hUHBxGa1qef9sysSj4GhOtLyB?= =?us-ascii?Q?qWSt5c3cArFa/sEbC79EnGtwtEz9XmsrHUJlWVa+tTnqe4pN/1kzDwmOxBV2?= =?us-ascii?Q?sq4YGsIOvudX+Eje3IzSY7GbHwGGh6HFtvifqMutZ9kpjvMoO91Kww/3iJfq?= =?us-ascii?Q?oQJ18Mz1dvNaDLoXpMHYmuD5MXih/MetYGsukobQ56Ahl6+tPJdztf8lLEjA?= =?us-ascii?Q?jNNOHQjupw6jljw72ynO56WW0GJdQa1fZl98xZJVcb6xUCW3BnUC2JH7g4O9?= =?us-ascii?Q?SeNOIhwQiGBO+n9b0dYLAGoWnu0zKguflKYGvUse7pqX+vDmCsFMdAWJ6/hN?= =?us-ascii?Q?ghvnxZtRPNw2D+FCe+NkO3ktjimiE4uIsx+sIxQE/QtpBhoNFMYkz/ZX+vxE?= =?us-ascii?Q?tEdNpd+f6P4wKHXLt/s/sacJOFKLg/k40NHdFnK+LHAwUB8u/NhkFDuDfv/R?= =?us-ascii?Q?T5e2uh3DWZVvcSVK17yleWEGb+Muj10zIBfS7t7Tj68HsYbKUEVaPEmhJwNH?= =?us-ascii?Q?r/2bqDaiWBW+g+WombIevqPFUv/4agvp8R85taxNN8scSByVIQJCWDVNunw4?= =?us-ascii?Q?ogqMDNEefYGan3cyKU973TCFJjw8y5frcEL423mtGNusam1QyGfaefPRuRdO?= =?us-ascii?Q?qmnjFHDCVynGgAlZMNwPMEs3lGzL5g6fcZOgyqfwyvymD6oNe1/uUNYGaX60?= =?us-ascii?Q?4ag670M9gF6PKtl8tLodzat57KZlXs91Z1ZbmTYPwpeXx3F4R6jC0+NIH1PW?= =?us-ascii?Q?W70Xg15AoQbEpH6vQT6dwnz3OK8W42rj4dsRQJL0Cg5c0G7asKXZ6ak8+ctw?= =?us-ascii?Q?j6uSNhlr+GhpgSEFz++t03Fb0x8lb2N/2VvSYNS6MHUgJjBRIUy8knJQ2MeH?= =?us-ascii?Q?7mMphpo35Ztci2jFjg/wxME76ocXM9/H6jbbx9ZlfnvlNVmwUCA6kqwFZsuU?= =?us-ascii?Q?aOT0XRwxeMcDUCb3thAfgZxHyhAZECBy4BiOST62Ewho5etlSq3QCr+Kn4D9?= =?us-ascii?Q?xN1bjg8/eXS/7iz1GWGvtpMLGukl/apHWXQsydwd3o1iwdxbkLJaV8z08y1r?= =?us-ascii?Q?CUKkaPOd3dLEk+jaO1gx+YMwHp0Yn7BEjH9rM676kDutn2xc4uZuEDoUQjx8?= =?us-ascii?Q?iYYVFSnu8ahkjb+uQ/kdNJ4L0OSeclL8wwDCBIjLGHfvflF9lOiFEFYNsiTN?= =?us-ascii?Q?HBlHkfrlFzvW/LRHYkG7rcq1?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: e72b4499-5111-47a3-5d08-08d8f9f337dc X-MS-Exchange-CrossTenant-AuthSource: DM5PR12MB1355.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Apr 2021 18:30:28.4362 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: tFzSiS9sBNEWAcp0q3W5bcipFqhHt6D8tPx39Il6zAhDRpqyAHGkm3S3GXyvS1Jwilb8txwZDPD90Z5aVcoSgg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB3692 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tom Lendacky The sev_vcpu_deliver_sipi_vector() routine will update the GHCB to inform the caller of the AP Reset Hold NAE event that a SIPI has been delivered. However, if a SIPI is performed without a corresponding AP Reset Hold, then the GHCB may not be mapped, which will result in a NULL pointer dereference. Check that the GHCB is mapped before attempting the update. Fixes: 647daca25d24 ("KVM: SVM: Add support for booting APs in an SEV-ES guest") Signed-off-by: Tom Lendacky --- arch/x86/kvm/svm/sev.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 83e00e524513..13758e3b106d 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -2105,5 +2105,6 @@ void sev_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector) * the guest will set the CS and RIP. Set SW_EXIT_INFO_2 to a * non-zero value. */ - ghcb_set_sw_exit_info_2(svm->ghcb, 1); + if (svm->ghcb) + ghcb_set_sw_exit_info_2(svm->ghcb, 1); } -- 2.31.0