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dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from CH0PR12MB5201.namprd12.prod.outlook.com (2603:10b6:610:b8::21) by SAVPR12MB999168.namprd12.prod.outlook.com (2603:10b6:806:4e6::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.546.15; Fri, 23 Oct 2026 05:21:57 +0000 Received: from CH0PR12MB5201.namprd12.prod.outlook.com ([fe80::fa53:495c:c3d5:243]) by CH0PR12MB5201.namprd12.prod.outlook.com ([fe80::fa53:495c:c3d5:243%6]) with mapi id 15.21.0546.012; Fri, 23 Oct 2026 05:21:56 +0000 From: Deepak Gupta To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, kvm@vger.kernel.org, kvmarm@lists.linux.dev, peter.maydell@linaro.org, pbonzini@redhat.com, mchehab+huawei@kernel.org, jiaqiyan@google.com, oliver.upton@linux.dev Subject: [PATCH v2 0/1] target/arm/kvm: handle KVM_EXIT_ARM_SEA Date: Fri, 23 Oct 2026 05:21:47 +0000 Message-ID: X-Mailer: git-send-email 2.53.0 In-Reply-To: References: Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SJ0PR05CA0191.namprd05.prod.outlook.com (2603:10b6:a03:330::16) To CH0PR12MB5201.namprd12.prod.outlook.com (2603:10b6:610:b8::21) X-Mailing-List: kvm@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH0PR12MB5201:EE_|SAVPR12MB999168:EE_ X-MS-Office365-Filtering-Correlation-Id: 0390808d-f402-4824-1f01-08df30c58e71 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|376014|1800799024|366016|261021123027099003|261022105027099003|261009223027099003|56012099006|260925021311599003|260925021911599003|11063799006|260925022911599003|10067099003|18002099003|6133799003|261021121427099003|261021135927099003|22082099003; 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QEMU does not consume the exit yet, so on a host whose HEST has no SEA-notified GHES source every guest-consumed memory error still ends in a guest "Asynchronous SError Interrupt" panic. This patch enables the capability, handles the exit by recording a GHES memory error (when the exit carries an address backed by guest RAM) and injecting a synchronous external abort that mirrors the original one, and wires up the BUS_MCEERR_AO SIGBUS case so the guest learns about the poisoned page asynchronously when the exit itself carried no address. Changes in v2 (review feedback received internally): * Do not enable the capability for VMs that expose EL2 (nested virtualization): the injection always targets EL1, which is wrong for a guest at EL2 or with HCR_EL2.TGE set. Such VMs keep KVM's SError. The enable moved from kvm_arch_init() to kvm_arch_init_vcpu(), where has_el2 is known; the cap is per VM and enabling it repeatedly is harmless. * The GED-notified GHES source exists for virt machine versions after 10.1, not 10.0 (hw_compat_10_1 clears x-has-hest-addr). Comment and commit message corrected, virt-10.1 added to the tests. * Document that BUS_MCEERR_AO delivery is best effort: a record is dropped with a warning while the guest has not acknowledged the previous one. * Clarify the kvm_inject_arm_sea() comment on the EC variant choice. Testing: arm64 host whose HEST has only GSIV/SDEI-notified sources, EINJ uncorrectable memory error into a page mapped by a guest, consumed by a guest process (-machine virt,ras=on). Before: guest panic. After: SIGBUS to the process, GHES record and hwpoison in the guest, guest stays up. Also checked: the pre-existing BUS_MCEERR_AR SIGBUS path still works (it is taken when the host's memory_failure() wins the race), ras=off (bare external abort to the guest, no record), -machine virt-10.1 (the AR path still delivers the synchronous record, the AO record is dropped with the warning), check-unit on the host. The EL2 skip is compile-tested only: the test host has no KVM nested support. [1] https://lore.kernel.org/r/20251013185903.1372553-1-jiaqiyan@google.com v1: https://lore.kernel.org/qemu-devel/cover.1792191544.git.deepagupta@nvidia.com/ Deepak Gupta (1): target/arm/kvm: handle KVM_EXIT_ARM_SEA and report BUS_MCEERR_AO target/arm/kvm.c | 176 +++++++++++++++++++++++++++++++++++----- target/arm/trace-events | 1 + 2 files changed, 158 insertions(+), 19 deletions(-) -- 2.53.0