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Re: [Qemu-arm] [PATCH v17 10/10] target-arm: kvm64: handle SIGBUS signal
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From: |
Igor Mammedov |
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Subject: |
Re: [Qemu-arm] [PATCH v17 10/10] target-arm: kvm64: handle SIGBUS signal from kernel or KVM |
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Date: |
Mon, 24 Jun 2019 15:08:10 +0200 |
On Tue, 14 May 2019 04:18:23 -0700
Dongjiu Geng <address@hidden> wrote:
> Add SIGBUS signal handler. In this handler, it checks the SIGBUS type,
> translates the host VA delivered by host to guest PA, then fill this PA
> to guest APEI GHES memory, then notify guest according to the SIGBUS type.
>
> 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 for the guest's stage 2, finally return
> to guest.
>
> Guest continues to access 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 address into guest APEI GHES memory and notify guest using
> Synchronous-External-Abort(SEA).
>
> Suggested-by: James Morse <address@hidden>
> Signed-off-by: Dongjiu Geng <address@hidden>
> ---
> hw/acpi/acpi_ghes.c | 177
> ++++++++++++++++++++++++++++++++++++++++++++
> include/hw/acpi/acpi_ghes.h | 6 +-
> include/sysemu/kvm.h | 2 +-
> target/arm/kvm64.c | 39 ++++++++++
> 4 files changed, 222 insertions(+), 2 deletions(-)
>
> diff --git a/hw/acpi/acpi_ghes.c b/hw/acpi/acpi_ghes.c
> index d03e797..06b7374 100644
> --- a/hw/acpi/acpi_ghes.c
> +++ b/hw/acpi/acpi_ghes.c
> @@ -26,6 +26,101 @@
> #include "sysemu/sysemu.h"
> #include "qemu/error-report.h"
>
> +/* UEFI 2.6: N.2.5 Memory Error Section */
> +static void build_append_mem_cper(GArray *table, uint64_t
> error_physical_addr)
> +{
> + /*
> + * Memory Error Record
> + */
> + build_append_int_noprefix(table,
> + (1UL << 14) | /* Type Valid */
> + (1UL << 1) /* Physical Address Valid */,
> + 8);
bad indent
> + /* Memory error status information */
> + build_append_int_noprefix(table, 0, 8);
> + /* The physical address at which the memory error occurred */
> + build_append_int_noprefix(table, error_physical_addr, 8);
> + build_append_int_noprefix(table, 0, 48);
> + build_append_int_noprefix(table, 0 /* Unknown error */, 1);
> + build_append_int_noprefix(table, 0, 7);
> +}
> +
> +static int ghes_record_mem_error(uint64_t error_block_address,
> + uint64_t error_physical_addr)
bad indent
> +{
> + GArray *block;
> + uint64_t current_block_length;
> + uint32_t data_length;
> + /* Memory section */
> + char mem_section_id_le[] = {0x14, 0x11, 0xBC, 0xA5, 0x64, 0x6F, 0xDE,
> + 0x4E, 0xB8, 0x63, 0x3E, 0x83, 0xED, 0x7C,
> + 0x83, 0xB1};
> + uint8_t fru_id[16] = {0};
> + uint8_t fru_text[20] = {0};
> +
> + /* Generic Error Status Block
> + * | +---------------------+
> + * | | block_status |
> + * | +---------------------+
> + * | | raw_data_offset |
> + * | +---------------------+
> + * | | raw_data_length |
> + * | +---------------------+
> + * | | data_length |
> + * | +---------------------+
> + * | | error_severity |
> + * | +---------------------+
> + */
> + block = g_array_new(false, true /* clear */, 1);
> +
> + /* Get the length of the Generic Error Data Entries */
> + cpu_physical_memory_read(error_block_address +
> + offsetof(AcpiGenericErrorStatus, data_length), &data_length, 4);
> + /* The current whole length of the generic error status block */
> + current_block_length = sizeof(AcpiGenericErrorStatus) +
> le32_to_cpu(data_length);
I might be missing something but why do you read length from guest?
Isn't it something provided by QEMU/host?
> +
> + /* This is the length if adding a new generic error data entry*/
> + data_length += GHES_DATA_LENGTH;
> + data_length += GHES_MEM_CPER_LENGTH;
> +
> + /* Check whether it will run out of the preallocated memory if adding a
> new
> + * generic error data entry
> + */
> + if ((data_length + sizeof(AcpiGenericErrorStatus)) >
> GHES_MAX_RAW_DATA_LENGTH) {
> + error_report("Record CPER out of boundary!!!");
> + return GHES_CPER_FAIL;
> + }
> +
> + /* Build the new generic error status block header */
> + build_append_ghes_generic_status(block,
> cpu_to_le32(ACPI_GEBS_UNCORRECTABLE), 0, 0,
> + cpu_to_le32(data_length), cpu_to_le32(ACPI_CPER_SEV_RECOVERABLE));
> +
> + /* Write back above generic error status block header to guest memory */
> + cpu_physical_memory_write(error_block_address, block->data,
> + block->len);
> +
> + /* Add a new generic error data entry */
> +
> + data_length = block->len;
> + /* Build this new generic error data entry header */
> + build_append_ghes_generic_data(block, mem_section_id_le,
> + cpu_to_le32(ACPI_CPER_SEV_RECOVERABLE),
> cpu_to_le32(0x300), 0, 0,
> + cpu_to_le32(80)/* the total size of Memory Error Record
> */, fru_id,
> + fru_text, 0);
> +
> + /* Build the memory section CPER for above new generic error data entry
> */
> + build_append_mem_cper(block, error_physical_addr);
> +
> + /* Write back above this new generic error data entry to guest memory */
> + cpu_physical_memory_write(error_block_address + current_block_length,
> + block->data + data_length, block->len - data_length);
> +
> + g_array_free(block, true);
> +
> + return GHES_CPER_OK;
> +}
> +
> /* Build table for the hardware error fw_cfg blob */
> void build_hardware_error_table(GArray *hardware_errors, BIOSLinker *linker)
> {
> @@ -169,3 +264,85 @@ void ghes_add_fw_cfg(FWCfgState *s, GArray
> *hardware_error)
> fw_cfg_add_file_callback(s, GHES_DATA_ADDR_FW_CFG_FILE, NULL, NULL, NULL,
> &ges.ghes_addr_le, sizeof(ges.ghes_addr_le), false);
> }
> +
> +bool ghes_record_errors(uint32_t notify, uint64_t physical_address)
> +{
> + uint64_t error_block_addr, read_ack_register_addr;
> + int read_ack_register = 0, loop = 0;
> + uint64_t start_addr = le32_to_cpu(ges.ghes_addr_le);
> + bool ret = GHES_CPER_FAIL;
> + const uint8_t error_source_id[] = { 0xff, 0xff, 0xff, 0xff,
> + 0xff, 0xff, 0xff, 0, 1};
> +
> + /*
> + * | +---------------------+ ges.ghes_addr_le
> + * | |error_block_address0 |
> + * | +---------------------+ --+--
> + * | | ............. | GHES_ADDRESS_SIZE
> + * | +---------------------+ --+--
> + * | |error_block_addressN |
> + * | +---------------------+
> + * | | read_ack_register0 |
> + * | +---------------------+ --+--
> + * | | ............. | GHES_ADDRESS_SIZE
> + * | +---------------------+ --+--
> + * | | read_ack_registerN |
> + * | +---------------------+ --+--
> + * | | CPER | |
> + * | | .... | GHES_MAX_RAW_DATA_LENGT
> + * | | CPER | |
> + * | +---------------------+ --+--
> + * | | .......... |
> + * | +---------------------+
> + * | | CPER |
> + * | | .... |
> + * | | CPER |
> + * | +---------------------+
> + */
> + if (physical_address && notify < ACPI_HEST_NOTIFY_RESERVED) {
> + /* Find and check the source id for this new CPER */
> + if (error_source_id[notify] != 0xff) {
> + start_addr += error_source_id[notify] * GHES_ADDRESS_SIZE;
> + } else {
> + goto out;
> + }
> +
> + cpu_physical_memory_read(start_addr, &error_block_addr,
> + GHES_ADDRESS_SIZE);
> +
> + read_ack_register_addr = start_addr +
> + ACPI_HEST_ERROR_SOURCE_COUNT * GHES_ADDRESS_SIZE;
> +retry:
> + cpu_physical_memory_read(read_ack_register_addr,
> + &read_ack_register, GHES_ADDRESS_SIZE);
> +
> + /* zero means OSPM does not acknowledge the error */
> + if (!read_ack_register) {
> + if (loop < 3) {
> + usleep(100 * 1000);
> + loop++;
> + goto retry;
> + } else {
> + error_report("OSPM does not acknowledge previous error,"
> + " so can not record CPER for current error, forcibly
> acknowledge"
> + " previous error to avoid blocking next time CPER
> record! Exit");
> + read_ack_register = 1;
> + cpu_physical_memory_write(read_ack_register_addr,
> + &read_ack_register, GHES_ADDRESS_SIZE);
> + }
> + } else {
> + if (error_block_addr) {
> + read_ack_register = 0;
> + /* Clear the Read Ack Register, OSPM will write it to 1 when
> + * acknowledge this error.
> + */
> + cpu_physical_memory_write(read_ack_register_addr,
> + &read_ack_register, GHES_ADDRESS_SIZE);
> + ret = ghes_record_mem_error(error_block_addr,
> physical_address);
> + }
> + }
> + }
> +
> +out:
> + return ret;
> +}
> diff --git a/include/hw/acpi/acpi_ghes.h b/include/hw/acpi/acpi_ghes.h
> index 38fd87c..6b38097 100644
> --- a/include/hw/acpi/acpi_ghes.h
> +++ b/include/hw/acpi/acpi_ghes.h
> @@ -32,11 +32,14 @@
> #define GHES_ADDRESS_SIZE 8
>
> #define GHES_DATA_LENGTH 72
> -#define GHES_CPER_LENGTH 80
> +#define GHES_MEM_CPER_LENGTH 80
>
> #define ReadAckPreserve 0xfffffffe
> #define ReadAckWrite 0x1
>
> +#define GHES_CPER_OK 1
> +#define GHES_CPER_FAIL 0
> +
> /* The max size in bytes for one error block */
> #define GHES_MAX_RAW_DATA_LENGTH 0x1000
> /* Now only have GPIO-Signal and ARMv8 SEA notification types error sources
> @@ -76,4 +79,5 @@ void build_apei_hest(GArray *table_data, GArray
> *hardware_error,
>
> void build_hardware_error_table(GArray *hardware_errors, BIOSLinker *linker);
> void ghes_add_fw_cfg(FWCfgState *s, GArray *hardware_errors);
> +bool ghes_record_errors(uint32_t notify, uint64_t error_physical_addr);
> #endif
> diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
> index a6d1cd1..1d1a7a8 100644
> --- a/include/sysemu/kvm.h
> +++ b/include/sysemu/kvm.h
> @@ -377,7 +377,7 @@ 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/kvm64.c b/target/arm/kvm64.c
> index c7bdc6a..d2eac28 100644
> --- a/target/arm/kvm64.c
> +++ b/target/arm/kvm64.c
> @@ -27,6 +27,10 @@
> #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/acpi_ghes.h"
> +#include "hw/acpi/acpi.h"
>
> static bool have_guest_debug;
>
> @@ -1029,6 +1033,41 @@ 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 (acpi_enabled && 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);
> + /* Asynchronous signal will be masked by main thread, so
> + * only handle synchronous signal.
> + */
> + if (code == BUS_MCEERR_AR) {
> + kvm_cpu_synchronize_state(c);
> + if (GHES_CPER_FAIL !=
> ghes_record_errors(ACPI_HEST_NOTIFY_SEA, paddr)) {
> + kvm_inject_arm_sea(c);
> + } else {
> + fprintf(stderr, "failed to record the error\n");
> + }
> + }
> + 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;
>