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Fri, 16 Oct 2026 23:05:51 +0000 Received: from CH0PR12MB5201.namprd12.prod.outlook.com ([fe80::fa53:495c:c3d5:243]) by CH0PR12MB5201.namprd12.prod.outlook.com ([fe80::fa53:495c:c3d5:243%4]) with mapi id 15.21.0522.012; Fri, 16 Oct 2026 23:05:50 +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 0/1] target/arm/kvm: handle KVM_EXIT_ARM_SEA Date: Fri, 16 Oct 2026 23:05:40 +0000 Message-ID: X-Mailer: git-send-email 2.53.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SA9PR13CA0062.namprd13.prod.outlook.com (2603:10b6:806:23::7) To CH0PR12MB5201.namprd12.prod.outlook.com (2603:10b6:610:b8::21) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH0PR12MB5201:EE_|CH9PR12MB167381:EE_ X-MS-Office365-Filtering-Correlation-Id: 0919bbf4-a07d-4b0c-4fe3-08df2bda0574 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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envelope-from=deepagupta@nvidia.com; helo=SN4PR2101CU001.outbound.protection.outlook.com X-Spam_score_int: -12 X-Spam_score: -1.3 X-Spam_bar: - X-Spam_report: (-1.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.24, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FORGED_SPF_HELO=1, SPF_HELO_PASS=-0.001, SPF_NONE=0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Fri, 16 Oct 2026 20:12:13 -0400 X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Hi, Linux 6.19 added KVM_CAP_ARM_SEA_TO_USER [1]: with the capability enabled, KVM returns a guest synchronous external abort that the host could not claim through APEI to userspace as KVM_EXIT_ARM_SEA, instead of injecting a virtual SError. 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. Points I would like feedback on: * Injection: I reuse the existing kvm_inject_arm_sea() route (arm_cpu_do_interrupt() after kvm_cpu_synchronize_state()) and let it pass the sanitised ESR fields (EC, IL, FnV, EA, CM, WnR, xFSC, SET) and the FAR through to the guest. KVM_SET_VCPU_EVENTS with ext_dabt_pending can only produce a data abort with FAR taken from the last exit, and the documentation restricts it to MMIO/NISV/ LDST64B exits, so it did not seem a good fit; happy to switch if that is preferred. * The BUS_MCEERR_AO record goes on ACPI_HEST_SRC_ID_QMP, which ghes.h documents as being for QMP-injected errors, because it is the only GED-notified source the virt machine has. If a dedicated source id for host-originated asynchronous records is preferred I can add one. * With the pre-10.1 single-block HEST layout (no GED-notified source) the AO record is dropped with a warning rather than written into the synchronous source's block. 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-10.0 (the AR path still delivers the synchronous record, the AO record is dropped with the warning), check-unit and check-qtest-aarch64 on the host. [1] https://lore.kernel.org/r/20251013185903.1372553-1-jiaqiyan@google.com Deepak Gupta (1): target/arm/kvm: handle KVM_EXIT_ARM_SEA and report BUS_MCEERR_AO target/arm/kvm.c | 164 +++++++++++++++++++++++++++++++++++----- target/arm/trace-events | 1 + 2 files changed, 146 insertions(+), 19 deletions(-) -- 2.53.0