Add SIGBUS signal handler. In this handler, it checks the SIGBUS type, translates the host VA which is delivered by host to guest PA, then fill this PA to CPER and fill the CPER to guest APEI GHES memory, finally notify guest according to the SIGBUS type. There are two kinds of SIGBUS that QEMU needs to handle, which are BUS_MCEERR_AO and BUS_MCEERR_AR. If guest accesses the poisoned memory, it generates Synchronous External Abort(SEA). Then host kernel gets an APEI notification and call memory_failure() to unmapped the affected page from the guest's stage2, and SIGBUS_MCEERR_AO is delivered to Qemu's main thread. If Qemu receives this SIGBUS, it will create a new CPER and add it to guest APEI GHES memory, then notify the guest with a GPIO-Signal notification. When guest hits a PG_hwpoison page, it will trap to KVM as stage2 fault, then a SIGBUS_MCEERR_AR synchronous signal is delivered to Qemu, Qemu record this error into guest APEI GHES memory and notify guest using Synchronous-External-Abort(SEA). Suggested-by: James Morse <james.morse@xxxxxxx> Signed-off-by: Dongjiu Geng <gengdongjiu@xxxxxxxxxx> --- Address James's comments to record CPER and notify guest for SIGBUS signal handling. Shown some discussion in [1]. [1]: https://lkml.org/lkml/2017/2/27/246 https://lkml.org/lkml/2017/9/14/241 https://lkml.org/lkml/2017/9/22/499 --- include/sysemu/kvm.h | 2 +- target/arm/kvm.c | 2 ++ target/arm/kvm64.c | 34 ++++++++++++++++++++++++++++++++++ 3 files changed, 37 insertions(+), 1 deletion(-) diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h index 3a458f5..90c1605 100644 --- a/include/sysemu/kvm.h +++ b/include/sysemu/kvm.h @@ -361,7 +361,7 @@ bool kvm_vcpu_id_is_valid(int vcpu_id); /* Returns VCPU ID to be used on KVM_CREATE_VCPU ioctl() */ unsigned long kvm_arch_vcpu_id(CPUState *cpu); -#ifdef TARGET_I386 +#if defined(TARGET_I386) || defined(TARGET_AARCH64) #define KVM_HAVE_MCE_INJECTION 1 void kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr); #endif diff --git a/target/arm/kvm.c b/target/arm/kvm.c index 7c17f0d..9d25f51 100644 --- a/target/arm/kvm.c +++ b/target/arm/kvm.c @@ -26,6 +26,7 @@ #include "exec/address-spaces.h" #include "hw/boards.h" #include "qemu/log.h" +#include "exec/ram_addr.h" const KVMCapabilityInfo kvm_arch_required_capabilities[] = { KVM_CAP_LAST_INFO @@ -182,6 +183,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s) cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE); + qemu_register_reset(kvm_unpoison_all, NULL); type_register_static(&host_arm_cpu_type_info); return 0; diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c index c00450d..6955d85 100644 --- a/target/arm/kvm64.c +++ b/target/arm/kvm64.c @@ -27,6 +27,9 @@ #include "kvm_arm.h" #include "internals.h" #include "hw/arm/arm.h" +#include "exec/ram_addr.h" +#include "hw/acpi/acpi-defs.h" +#include "hw/acpi/hest_ghes.h" static bool have_guest_debug; @@ -944,6 +947,37 @@ int kvm_arch_get_registers(CPUState *cs) return ret; } +void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr) +{ + ram_addr_t ram_addr; + hwaddr paddr; + + assert(code == BUS_MCEERR_AR || code == BUS_MCEERR_AO); + if (addr) { + ram_addr = qemu_ram_addr_from_host(addr); + if (ram_addr != RAM_ADDR_INVALID && + kvm_physical_memory_addr_from_host(c->kvm_state, addr, &paddr)) { + kvm_hwpoison_page_add(ram_addr); + if (code == BUS_MCEERR_AR) { + kvm_cpu_synchronize_state(c); + ghes_record_errors(ACPI_HEST_NOTIFY_SEA, paddr); + kvm_inject_arm_sea(c); + } else if (code == BUS_MCEERR_AO) { + ghes_record_errors(ACPI_HEST_NOTIFY_GPIO, paddr); + qemu_hardware_error_notify(); + } + return; + } + fprintf(stderr, "Hardware memory error for memory used by " + "QEMU itself instead of guest system!\n"); + } + + if (code == BUS_MCEERR_AR) { + fprintf(stderr, "Hardware memory error!\n"); + exit(1); + } +} + /* C6.6.29 BRK instruction */ static const uint32_t brk_insn = 0xd4200000; -- 1.8.3.1
