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SubjectRe: [PATCH v11 2/6] ACPI: Add APEI GHES Table Generation support


On 2017/8/18 22:23, Dongjiu Geng wrote:
> This implements APEI GHES Table by passing the error CPER info
> to the guest via a fw_cfg_blob. After a CPER info is recorded, an
> SEA(Synchronous External Abort)/SEI(SError Interrupt) exception
> will be injected into the guest OS.
>
> Below is the table layout, the max number of error soure is 11,
> which is classified by notification type.
>
> etc/acpi/tables etc/hardware_errors
> ==================== ==========================================
> + +--------------------------+ +------------------+
> | | HEST | | address | +--------------+
> | +--------------------------+ | registers | | Error Status |
> | | GHES0 | | +----------------+ | Data Block 0 |
> | +--------------------------+ +--------->| |status_address0 |------------->| +------------+
> | | ................. | | | +----------------+ | | CPER |
> | | error_status_address-----+-+ +------->| |status_address1 |----------+ | | CPER |
> | | ................. | | | +----------------+ | | | .... |
> | | read_ack_register--------+-+ | | ............. | | | | CPER |
> | | read_ack_preserve | | | +------------------+ | | +-+------------+
> | | read_ack_write | | | +----->| |status_address10|--------+ | | Error Status |
> + +--------------------------+ | | | | +----------------+ | | | Data Block 1 |
> | | GHES1 | +-+-+----->| | ack_value0 | | +-->| +------------+
> + +--------------------------+ | | | +----------------+ | | | CPER |
> | | ................. | | | +--->| | ack_value1 | | | | CPER |
> | | error_status_address-----+---+ | | | +----------------+ | | | .... |
> | | ................. | | | | | ............. | | | | CPER |
> | | read_ack_register--------+-----+-+ | +----------------+ | +-+------------+
> | | read_ack_preserve | | +->| | ack_value10 | | | |.......... |
> | | read_ack_write | | | | +----------------+ | | +------------+
> + +--------------------------| | | | | Error Status |
> | | ............... | | | | | Data Block 10|
> + +--------------------------+ | | +---->| +------------+
> | | GHES10 | | | | | CPER |
> + +--------------------------+ | | | | CPER |
> | | ................. | | | | | .... |
> | | error_status_address-----+-----+ | | | CPER |
> | | ................. | | +-+------------+
> | | read_ack_register--------+---------+
> | | read_ack_preserve |
> | | read_ack_write |
> + +--------------------------+
>
> For GHESv2 error source, the OSPM must acknowledges the error via Read Ack register.
> so user space must check the ack value to avoid read-write race condition.
>
> Signed-off-by: Dongjiu Geng <gengdongjiu@huawei.com>
> ---
> hw/acpi/aml-build.c | 2 +
> hw/acpi/hest_ghes.c | 345 ++++++++++++++++++++++++++++++++++++++++++++
> hw/arm/virt-acpi-build.c | 6 +
> include/hw/acpi/aml-build.h | 1 +
> include/hw/acpi/hest_ghes.h | 47 ++++++
> 5 files changed, 401 insertions(+)
> create mode 100644 hw/acpi/hest_ghes.c
Don't need to add the new file to hw/acpi/Makefile.objs?

> create mode 100644 include/hw/acpi/hest_ghes.h
>
> diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
> index 36a6cc4..6849e5f 100644
> --- a/hw/acpi/aml-build.c
> +++ b/hw/acpi/aml-build.c
> @@ -1561,6 +1561,7 @@ void acpi_build_tables_init(AcpiBuildTables *tables)
> tables->table_data = g_array_new(false, true /* clear */, 1);
> tables->tcpalog = g_array_new(false, true /* clear */, 1);
> tables->vmgenid = g_array_new(false, true /* clear */, 1);
> + tables->hardware_errors = g_array_new(false, true /* clear */, 1);
> tables->linker = bios_linker_loader_init();
> }
>
> @@ -1571,6 +1572,7 @@ void acpi_build_tables_cleanup(AcpiBuildTables *tables, bool mfre)
> g_array_free(tables->table_data, true);
> g_array_free(tables->tcpalog, mfre);
> g_array_free(tables->vmgenid, mfre);
> + g_array_free(tables->hardware_errors, mfre);
> }
>
> /* Build rsdt table */
> diff --git a/hw/acpi/hest_ghes.c b/hw/acpi/hest_ghes.c
> new file mode 100644
> index 0000000..ff6b5ef
> --- /dev/null
> +++ b/hw/acpi/hest_ghes.c
> @@ -0,0 +1,345 @@
> +/*
> + * APEI GHES table Generation
> + *
> + * Copyright (C) 2017 huawei.
> + *
> + * Author: Dongjiu Geng <gengdongjiu@huawei.com>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + *
> + */
Please unify this of this file and hest_ghes.h by refering to other files.

> +
> +#include "qemu/osdep.h"
> +#include "qmp-commands.h"
unnecessary including

> +#include "hw/acpi/acpi.h"
> +#include "hw/acpi/aml-build.h"
> +#include "hw/acpi/hest_ghes.h"
> +#include "hw/nvram/fw_cfg.h"
> +#include "sysemu/sysemu.h"
> +#include "qemu/error-report.h"
> +
> +/* The structure that stands for the layout
> + * GHES_ERRORS_FW_CFG_FILE fw_cfg blob
> + *
> + * etc/hardware_errors
> + * ==========================================
> + * +------------------+
> + * | address | +--------------+
> + * | registers | | Error Status |
> + * | +----------------+ | Data Block 0 |
> + * | |status_address0 |------------->| +------------+
> + * | +----------------+ | | CPER |
> + * | |status_address1 |----------+ | | CPER |
> + * | +----------------+ | | | .... |
> + * | |............. | | | | CPER |
> + * | +----------------+ | | +------------+
> + * | |status_address10|-----+ | | Error Status |
> + * | +----------------+ | | | Data Block 1 |
> + * | |ack_value0 | | +-->| +------------+
> + * | +----------------+ | | | CPER |
> + * | |ack_value1 | | | | CPER |
> + * | +----------------+ | | | .... |
> + * | | ............. | | | | CPER |
> + * | +----------------+ | +-+------------+
> + * | |ack_value10 | | | |.......... |
> + * | +----------------+ | | +------------+
> + * | | Error Status |
> + * | | Data Block10 |
> + * +------->+------------+
> + * | | CPER |
> + * | | CPER |
> + * | | .... |
> + * | | CPER |
> + * +-+------------+
> + */
> +struct hardware_errors_buffer {
> + /* Generic Error Status Block register */
> + uint64_t gesb_address[GHES_ACPI_HEST_NOTIFY_RESERVED];
> + uint64_t ack_value[GHES_ACPI_HEST_NOTIFY_RESERVED];
> + char gesb[GHES_MAX_RAW_DATA_LENGTH][GHES_ACPI_HEST_NOTIFY_RESERVED];
> +};
> +
> +static int ghes_record_cper(uint64_t error_block_address,
> + uint64_t error_physical_addr)
> +{
> + AcpiGenericErrorStatus block;
> + AcpiGenericErrorData *gdata;
> + UefiCperSecMemErr *mem_err;
> + uint64_t current_block_length;
> + unsigned char *buffer;
> + /* memory section */
> + char mem_section_id_le[] = {0x14, 0x11, 0xBC, 0xA5, 0x64, 0x6F, 0xDE,
> + 0x4E, 0xB8, 0x63, 0x3E, 0x83, 0xED, 0x7C,
> + 0x83, 0xB1};
> +
> + cpu_physical_memory_read(error_block_address, &block,
> + sizeof(AcpiGenericErrorStatus));
> +
> + /* Get the current generic error status block length */
> + current_block_length = sizeof(AcpiGenericErrorStatus) +
> + le32_to_cpu(block.data_length);
> +
> + /* If the Generic Error Status Block is NULL, update
> + * the block header
> + */
> + if (!block.block_status) {
> + block.block_status = ACPI_GEBS_UNCORRECTABLE;
> + block.error_severity = ACPI_CPER_SEV_RECOVERABLE;
> + }
> +
> + block.data_length += cpu_to_le32(sizeof(AcpiGenericErrorData));
> + block.data_length += cpu_to_le32(sizeof(UefiCperSecMemErr));
> +
> + /* check whether it runs out of the preallocated memory */
> + if ((le32_to_cpu(block.data_length) + sizeof(AcpiGenericErrorStatus)) >
> + GHES_MAX_RAW_DATA_LENGTH) {
> + error_report("Record CPER out of boundary!!!");
> + return GHES_CPER_FAIL;
> + }
> +
> + /* Write back the Generic Error Status Block to guest memory */
> + cpu_physical_memory_write(error_block_address, &block,
> + sizeof(AcpiGenericErrorStatus));
> +
> + /* Fill in Generic Error Data Entry */
> + buffer = g_malloc0(sizeof(AcpiGenericErrorData) +
> + sizeof(UefiCperSecMemErr));
> +
> +
> + memset(buffer, 0, sizeof(AcpiGenericErrorData) + sizeof(UefiCperSecMemErr));
> + gdata = (AcpiGenericErrorData *)buffer;
> +
> + /* Memory section */
> + memcpy(&(gdata->section_type_le), &mem_section_id_le,
> + sizeof(mem_section_id_le));
> +
> + /* error severity is recoverable */
> + gdata->error_severity = ACPI_CPER_SEV_RECOVERABLE;
> + gdata->revision = 0x300; /* the revision number is 0x300 */
> + gdata->error_data_length = cpu_to_le32(sizeof(UefiCperSecMemErr));
> +
> + mem_err = (UefiCperSecMemErr *) (gdata + 1);
> +
> + /* User space only handle the memory section CPER */
> +
> + /* Hard code to Multi-bit ECC error */
> + mem_err->validation_bits |= cpu_to_le32(UEFI_CPER_MEM_VALID_ERROR_TYPE);
> + mem_err->error_type = cpu_to_le32(UEFI_CPER_MEM_ERROR_TYPE_MULTI_ECC);
> +
> + /* Record the physical address at which the memory error occurred */
> + mem_err->validation_bits |= cpu_to_le32(UEFI_CPER_MEM_VALID_PA);
> + mem_err->physical_addr = cpu_to_le32(error_physical_addr);
> +
> + /* Write back the Generic Error Data Entry to guest memory */
> + cpu_physical_memory_write(error_block_address + current_block_length,
> + buffer, sizeof(AcpiGenericErrorData) + sizeof(UefiCperSecMemErr));
> +
> + g_free(buffer);
> + return GHES_CPER_OK;
> +}
> +
> +static void
> +build_address(GArray *table_data, BIOSLinker *linker,
> + uint32_t dst_patched_offset, uint32_t src_offset,
> + uint8_t address_space_id , uint8_t register_bit_width,
> + uint8_t register_bit_offset, uint8_t access_size)
> +{
> + uint32_t address_size = sizeof(struct AcpiGenericAddress) -
> + offsetof(struct AcpiGenericAddress, address);
> +
> + /* Address space */
> + build_append_int_noprefix(table_data, address_space_id, 1);
> + /* register bit width */
> + build_append_int_noprefix(table_data, register_bit_width, 1);
> + /* register bit offset */
> + build_append_int_noprefix(table_data, register_bit_offset, 1);
> + /* access size */
> + build_append_int_noprefix(table_data, access_size, 1);
> + acpi_data_push(table_data, address_size);
> +
> + /* Patch address of ERRORS fw_cfg blob into the TABLE fw_cfg blob so OSPM
> + * can retrieve and read it. the address size is 64 bits.
> + */
> + bios_linker_loader_add_pointer(linker,
> + ACPI_BUILD_TABLE_FILE, dst_patched_offset, sizeof(uint64_t),
> + GHES_ERRORS_FW_CFG_FILE, src_offset);
> +}
> +
> +void ghes_build_acpi(GArray *table_data, GArray *hardware_error,
> + BIOSLinker *linker)
> +{
> + uint32_t ghes_start = table_data->len;
> + uint32_t address_size, error_status_address_offset;
> + uint32_t read_ack_register_offset, i;
> +
> + address_size = sizeof(struct AcpiGenericAddress) -
> + offsetof(struct AcpiGenericAddress, address);
> +
> + error_status_address_offset = ghes_start +
> + sizeof(AcpiHardwareErrorSourceTable) +
> + offsetof(AcpiGenericHardwareErrorSourceV2, error_status_address) +
> + offsetof(struct AcpiGenericAddress, address);
> +
> + read_ack_register_offset = ghes_start +
> + sizeof(AcpiHardwareErrorSourceTable) +
> + offsetof(AcpiGenericHardwareErrorSourceV2, read_ack_register) +
> + offsetof(struct AcpiGenericAddress, address);
> +
> + acpi_data_push(hardware_error,
> + offsetof(struct hardware_errors_buffer, ack_value));
> + for (i = 0; i < GHES_ACPI_HEST_NOTIFY_RESERVED; i++)
> + /* Initialize read ack register */
> + build_append_int_noprefix((void *)hardware_error, 1, 8);
> +
> + /* Reserved the total size for ERRORS fw_cfg blob
> + */
> + acpi_data_push(hardware_error, sizeof(struct hardware_errors_buffer));
> +
> + /* Allocate guest memory for the Data fw_cfg blob */
> + bios_linker_loader_alloc(linker, GHES_ERRORS_FW_CFG_FILE, hardware_error,
> + 1, false);
> + /* Reserve table header size */
> + acpi_data_push(table_data, sizeof(AcpiTableHeader));
> +
> + build_append_int_noprefix(table_data, GHES_ACPI_HEST_NOTIFY_RESERVED, 4);
> +
> + for (i = 0; i < GHES_ACPI_HEST_NOTIFY_RESERVED; i++) {
> + build_append_int_noprefix(table_data,
> + ACPI_HEST_SOURCE_GENERIC_ERROR_V2, 2); /* type */
> + /* source id */
> + build_append_int_noprefix(table_data, cpu_to_le16(i), 2);
> + /* related source id */
> + build_append_int_noprefix(table_data, 0xffff, 2);
> + build_append_int_noprefix(table_data, 0, 1); /* flags */
> +
> + /* Currently only enable SEA notification type to avoid the kernel
> + * warning, reserve the space for other notification error source
> + */
> + if (i == ACPI_HEST_NOTIFY_SEA) {
> + build_append_int_noprefix(table_data, 1, 1); /* enabled */
> + } else {
> + build_append_int_noprefix(table_data, 0, 1); /* enabled */
> + }
> +
> + /* The number of error status block per generic hardware error source */
> + build_append_int_noprefix(table_data, 1, 4);
> + /* Max sections per record */
> + build_append_int_noprefix(table_data, 1, 4);
> + /* Max raw data length */
> + build_append_int_noprefix(table_data, GHES_MAX_RAW_DATA_LENGTH, 4);
> +
> + /* Build error status address*/
> + build_address(table_data, linker, error_status_address_offset + i *
> + sizeof(AcpiGenericHardwareErrorSourceV2), i * address_size,
> + AML_SYSTEM_MEMORY, 0x40, 0, 4 /* QWord access */);
> +
> + /* Hardware error notification structure */
> + build_append_int_noprefix(table_data, i, 1); /* type */
> + /* length */
> + build_append_int_noprefix(table_data, sizeof(AcpiHestNotify), 1);
> + build_append_int_noprefix(table_data, 0, 26);
> +
> + /* Error Status Block Length */
> + build_append_int_noprefix(table_data,
> + cpu_to_le32(GHES_MAX_RAW_DATA_LENGTH), 4);
> +
> + /* Build read ack register */
> + build_address(table_data, linker, read_ack_register_offset + i *
> + sizeof(AcpiGenericHardwareErrorSourceV2),
> + offsetof(struct hardware_errors_buffer, ack_value) +
> + i * address_size, AML_SYSTEM_MEMORY, 0x40, 0,
> + 4 /* QWord access */);
> +
> + /* Read ack preserve */
> + build_append_int_noprefix(table_data, cpu_to_le64(0xfffffffe), 8);
> +
> + /* Read ack write */
> + build_append_int_noprefix(table_data, cpu_to_le64(0x1), 8);
> + }
> +
> + for (i = 0; i < GHES_ACPI_HEST_NOTIFY_RESERVED; i++)
> + /* Patch address of generic error status block into
> + * the address register so OSPM can retrieve and read it.
> + */
> + bios_linker_loader_add_pointer(linker,
> + GHES_ERRORS_FW_CFG_FILE, address_size * i, address_size,
> + GHES_ERRORS_FW_CFG_FILE,
> + offsetof(struct hardware_errors_buffer, gesb) +
> + i * GHES_MAX_RAW_DATA_LENGTH);
> +
> + /* Patch address of ERRORS fw_cfg blob into the ADDR fw_cfg blob
> + * so QEMU can write the ERRORS there. The address is expected to be
> + * < 4GB, but write 64 bits anyway.
> + */
> + bios_linker_loader_write_pointer(linker, GHES_DATA_ADDR_FW_CFG_FILE,
> + 0, address_size, GHES_ERRORS_FW_CFG_FILE,
> + offsetof(struct hardware_errors_buffer, gesb));
> +
> + build_header(linker, table_data,
> + (void *)(table_data->data + ghes_start), "HEST",
> + table_data->len - ghes_start, 1, NULL, "GHES");
> +}
> +
> +static GhesState ges;
> +void ghes_add_fw_cfg(FWCfgState *s, GArray *hardware_error)
> +{
> +
> + size_t request_block_size = sizeof(uint64_t) + GHES_MAX_RAW_DATA_LENGTH;
> + size_t size = GHES_ACPI_HEST_NOTIFY_RESERVED * request_block_size;
> +
> + /* Create a read-only fw_cfg file for GHES */
> + fw_cfg_add_file(s, GHES_ERRORS_FW_CFG_FILE, hardware_error->data,
> + size);
> + /* Create a read-write fw_cfg file for Address */
> + fw_cfg_add_file_callback(s, GHES_DATA_ADDR_FW_CFG_FILE, NULL, NULL,
> + &ges.ghes_addr_le, sizeof(ges.ghes_addr_le), false);
> +}
> +
> +bool ghes_update_guest(uint32_t notify, uint64_t physical_address)
> +{
> + uint64_t error_block_addr;
> + uint64_t ack_value_addr, ack_value = 0;
> + int loop = 0, ack_value_size;
> + bool ret = GHES_CPER_FAIL;
> +
> + ack_value_size = (offsetof(struct hardware_errors_buffer, gesb) -
> + offsetof(struct hardware_errors_buffer, ack_value)) /
> + GHES_ACPI_HEST_NOTIFY_RESERVED;
> +
> + if (physical_address && notify < GHES_ACPI_HEST_NOTIFY_RESERVED) {
> + error_block_addr = ges.ghes_addr_le + notify * GHES_MAX_RAW_DATA_LENGTH;
> + error_block_addr = le32_to_cpu(error_block_addr);
> +
> + ack_value_addr = ges.ghes_addr_le -
> + (GHES_ACPI_HEST_NOTIFY_RESERVED - notify) * ack_value_size;
> +retry:
> + cpu_physical_memory_read(ack_value_addr, &ack_value, ack_value_size);
> + if (!ack_value) {
> + if (loop < 3) {
> + usleep(100 * 1000);
> + loop++;
> + goto retry;
> + } else {
> + error_report("Last time OSPM does not acknowledge the error,"
> + " record CPER failed this time, set the ack value to"
> + " avoid blocking next time CPER record! exit");
> + ack_value = 1;
> + cpu_physical_memory_write(ack_value_addr,
> + &ack_value, ack_value_size);
> + return ret;
> + }
> + } else {
> + /* A zero value in ghes_addr means that BIOS has not yet written
> + * the address
> + */
> + if (error_block_addr) {
> + ack_value = 0;
> + cpu_physical_memory_write(ack_value_addr,
> + &ack_value, ack_value_size);
> + ret = ghes_record_cper(error_block_addr, physical_address);
> + }
> + }
> + }
> + return ret;
> +}
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index 3d78ff6..def1ec1 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -45,6 +45,7 @@
> #include "hw/arm/virt.h"
> #include "sysemu/numa.h"
> #include "kvm_arm.h"
> +#include "hw/acpi/hest_ghes.h"
>
> #define ARM_SPI_BASE 32
> #define ACPI_POWER_BUTTON_DEVICE "PWRB"
> @@ -771,6 +772,9 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
> acpi_add_table(table_offsets, tables_blob);
> build_spcr(tables_blob, tables->linker, vms);
>
> + acpi_add_table(table_offsets, tables_blob);
> + ghes_build_acpi(tables_blob, tables->hardware_errors, tables->linker);
> +
So we add this table unconditionally. Is there any bad impact if QEMU
runs on old kvm? Does it need to check whether KVM supports RAS?

> if (nb_numa_nodes > 0) {
> acpi_add_table(table_offsets, tables_blob);
> build_srat(tables_blob, tables->linker, vms);
> @@ -887,6 +891,8 @@ void virt_acpi_setup(VirtMachineState *vms)
> fw_cfg_add_file(vms->fw_cfg, ACPI_BUILD_TPMLOG_FILE, tables.tcpalog->data,
> acpi_data_len(tables.tcpalog));
>
> + ghes_add_fw_cfg(vms->fw_cfg, tables.hardware_errors);
> +
> build_state->rsdp_mr = acpi_add_rom_blob(build_state, tables.rsdp,
> ACPI_BUILD_RSDP_FILE, 0);
>
> diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h
> index 88d0738..7f7b55c 100644
> --- a/include/hw/acpi/aml-build.h
> +++ b/include/hw/acpi/aml-build.h
> @@ -211,6 +211,7 @@ struct AcpiBuildTables {
> GArray *rsdp;
> GArray *tcpalog;
> GArray *vmgenid;
> + GArray *hardware_errors;
> BIOSLinker *linker;
> } AcpiBuildTables;
>
> diff --git a/include/hw/acpi/hest_ghes.h b/include/hw/acpi/hest_ghes.h
> new file mode 100644
> index 0000000..0772756
> --- /dev/null
> +++ b/include/hw/acpi/hest_ghes.h
> @@ -0,0 +1,47 @@
> +/*
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> +
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * Authors:
> + * Dongjiu Geng <gengdongjiu@huawei.com>
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef ACPI_GHES_H
> +#define ACPI_GHES_H
> +
> +#include "hw/acpi/bios-linker-loader.h"
> +
> +#define GHES_ERRORS_FW_CFG_FILE "etc/hardware_errors"
> +#define GHES_DATA_ADDR_FW_CFG_FILE "etc/hardware_errors_addr"
> +
> +#define GHES_GAS_ADDRESS_OFFSET 4
> +#define GHES_ERROR_STATUS_ADDRESS_OFFSET 20
> +#define GHES_NOTIFICATION_STRUCTURE 32
> +
> +#define GHES_CPER_OK 1
> +#define GHES_CPER_FAIL 0
> +
> +#define GHES_ACPI_HEST_NOTIFY_RESERVED 11
> +/* The max size in Bytes for one error block */
> +#define GHES_MAX_RAW_DATA_LENGTH 0x1000
> +
> +
> +typedef struct GhesState {
> + uint64_t ghes_addr_le;
> +} GhesState;
> +
> +void ghes_build_acpi(GArray *table_data, GArray *hardware_error,
> + BIOSLinker *linker);
> +void ghes_add_fw_cfg(FWCfgState *s, GArray *hardware_errors);
> +bool ghes_update_guest(uint32_t notify, uint64_t error_physical_addr);
> +#endif
>

--
Shannon

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