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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; Received: from SATLEXMB04.amd.com (165.204.84.17) by BN8NAM11FT061.mail.protection.outlook.com (10.13.177.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.5227.15 via Frontend Transport; Wed, 4 May 2022 07:32:07 +0000 Received: from sp5-759chost.amd.com (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 15.1.2375.24; Wed, 4 May 2022 02:32:02 -0500 From: Suravee Suthikulpanit To: , CC: , , , , , , , Suravee Suthikulpanit Subject: [PATCH v3 13/14] KVM: SVM: Use target APIC ID to complete x2AVIC IRQs when possible Date: Wed, 4 May 2022 02:31:27 -0500 Message-ID: <20220504073128.12031-14-suravee.suthikulpanit@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220504073128.12031-1-suravee.suthikulpanit@amd.com> References: <20220504073128.12031-1-suravee.suthikulpanit@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 8a638e13-6231-4d7d-7ac7-08da2da031a3 X-MS-TrafficTypeDiagnostic: BN8PR12MB3012:EE_ X-Microsoft-Antispam-PRVS: 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: 04 May 2022 07:32:07.6536 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8a638e13-6231-4d7d-7ac7-08da2da031a3 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: BN8NAM11FT061.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN8PR12MB3012 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For x2AVIC, the index from incomplete IPI #vmexit info is invalid for logical cluster mode. Only ICRH/ICRL values can be used to determine the IPI destination APIC ID. Since QEMU defines guest physical APIC ID to be the same as vCPU ID, it can be used to quickly identify the target vCPU to deliver IPI, and avoid the overhead from searching through all vCPUs to match the target vCPU. Signed-off-by: Suravee Suthikulpanit --- arch/x86/kvm/svm/avic.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c index 3b6a96043633..a526fbc60bbd 100644 --- a/arch/x86/kvm/svm/avic.c +++ b/arch/x86/kvm/svm/avic.c @@ -377,7 +377,26 @@ static int avic_kick_target_vcpus_fast(struct kvm *kvm, struct kvm_lapic *source /* For xAPIC logical mode, the index is for logical APIC table. */ apic_id = avic_logical_id_table[index] & 0x1ff; } else { - return -EINVAL; + /* For x2APIC logical mode, cannot leverage the index. + * Instead, calculate physical ID from logical ID in ICRH. + */ + int apic; + int first = ffs(icrh & 0xffff); + int last = fls(icrh & 0xffff); + int cluster = (icrh & 0xffff0000) >> 16; + + /* + * If the x2APIC logical ID sub-field (i.e. icrh[15:0]) contains zero + * or more than 1 bits, we cannot match just one vcpu to kick for + * fast path. + */ + if (!first || (first != last)) + return -EINVAL; + + apic = first - 1; + if ((apic < 0) || (apic > 15) || (cluster >= 0xfffff)) + return -EINVAL; + apic_id = (cluster << 4) + apic; } } -- 2.25.1