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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. 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