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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by MN1PEPF0000ECDB.mail.protection.outlook.com (10.167.242.139) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7519.19 via Frontend Transport; Sun, 21 Apr 2024 18:06:33 +0000 Received: from localhost (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Sun, 21 Apr 2024 13:06:33 -0500 From: Michael Roth To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v14 17/22] KVM: SEV: Avoid WBINVD for HVA-based MMU notifications for SNP Date: Sun, 21 Apr 2024 13:01:17 -0500 Message-ID: <20240421180122.1650812-18-michael.roth@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240421180122.1650812-1-michael.roth@amd.com> References: <20240421180122.1650812-1-michael.roth@amd.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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: MN1PEPF0000ECDB:EE_|CH3PR12MB7572:EE_ X-MS-Office365-Filtering-Correlation-Id: 1ca948b7-bf41-41b4-ec30-08dc622dc77f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(82310400014)(376005)(7416005)(1800799015)(36860700004);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Apr 2024 18:06:33.9242 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1ca948b7-bf41-41b4-ec30-08dc622dc77f 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: MN1PEPF0000ECDB.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB7572 From: Ashish Kalra With SNP/guest_memfd, private/encrypted memory should not be mappable, and MMU notifications for HVA-mapped memory will only be relevant to unencrypted guest memory. Therefore, the rationale behind issuing a wbinvd_on_all_cpus() in sev_guest_memory_reclaimed() should not apply for SNP guests and can be ignored. Signed-off-by: Ashish Kalra Reviewed-by: Paolo Bonzini [mdr: Add some clarifications in commit] Signed-off-by: Michael Roth --- arch/x86/kvm/svm/sev.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 243369e302f4..cf00a811aca5 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -3042,7 +3042,14 @@ static void sev_flush_encrypted_page(struct kvm_vcpu *vcpu, void *va) void sev_guest_memory_reclaimed(struct kvm *kvm) { - if (!sev_guest(kvm)) + /* + * With SNP+gmem, private/encrypted memory should be + * unreachable via the hva-based mmu notifiers. Additionally, + * for shared->private translations, H/W coherency will ensure + * first guest access to the page would clear out any existing + * dirty copies of that cacheline. + */ + if (!sev_guest(kvm) || sev_snp_guest(kvm)) return; wbinvd_on_all_cpus();