Re: [PATCH v22 5/9] ACPI: Record the Generic Error Status Block address

[gengdongjiu <gengdongjiu@huawei.com>]

On 2020/1/17 0:44, Peter Maydell wrote:
> On Wed, 8 Jan 2020 at 11:33, Dongjiu Geng <gengdongjiu@huawei.com> wrote:
>>
>> Record the GHEB address via fw_cfg file, when recording
>> a error to CPER, it will use this address to find out
>> Generic Error Data Entries and write the error.
>>
>> Make the HEST GHES to a GED device.
>>
>> Signed-off-by: Dongjiu Geng <gengdongjiu@huawei.com>
>> Signed-off-by: Xiang Zheng <zhengxiang9@huawei.com>
>> ---
>>  hw/acpi/generic_event_device.c         | 15 ++++++++++++++-
>>  hw/acpi/ghes.c                         | 16 ++++++++++++++++
>>  hw/arm/virt-acpi-build.c               | 13 ++++++++++++-
>>  include/hw/acpi/generic_event_device.h |  2 ++
>>  include/hw/acpi/ghes.h                 |  6 ++++++
>>  5 files changed, 50 insertions(+), 2 deletions(-)
>>
>> diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
>> index 9cee90c..9bf37e4 100644
>> --- a/hw/acpi/generic_event_device.c
>> +++ b/hw/acpi/generic_event_device.c
>> @@ -234,12 +234,25 @@ static const VMStateDescription vmstate_ged_state = {
>>      }
>>  };
>>
>> +static const VMStateDescription vmstate_ghes_state = {
>> +    .name = "acpi-ghes-state",
>> +    .version_id = 1,
>> +    .minimum_version_id = 1,
>> +    .fields      = (VMStateField[]) {
>> +        VMSTATE_UINT64(ghes_addr_le, AcpiGhesState),
>> +        VMSTATE_END_OF_LIST()
>> +    }
>> +};
>> +
>>  static const VMStateDescription vmstate_acpi_ged = {
>>      .name = "acpi-ged",
>>      .version_id = 1,
>>      .minimum_version_id = 1,
>>      .fields = (VMStateField[]) {
>> -        VMSTATE_STRUCT(ged_state, AcpiGedState, 1, vmstate_ged_state, GEDState),
>> +        VMSTATE_STRUCT(ged_state, AcpiGedState, 1,
>> +                       vmstate_ged_state, GEDState),
>> +        VMSTATE_STRUCT(ghes_state, AcpiGedState, 1,
>> +                       vmstate_ghes_state, AcpiGhesState),
>>          VMSTATE_END_OF_LIST(),
>>      },
>>      .subsections = (const VMStateDescription * []) {
> 
> You can't just add fields to an existing VMStateDescription
> like this -- it will break migration compatibility. Instead you
> need to add a new subsection to this vmstate, with a '.needed'
> function which indicates when the subsection should be present.

Hi Peter/Igor
   In order to avoid migration failure, do you think whether below change is Ok to make error table address(AcpiGhesState) to a part of GED device? thanks a lot in advance.

---------------------------------------------------------------------------------------------
diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
index 021ed2b..264154d 100644
--- a/hw/acpi/generic_event_device.c
+++ b/hw/acpi/generic_event_device.c
@@ -234,16 +234,34 @@ static const VMStateDescription vmstate_ged_state = {
     }
 };

+static bool ghes_needed(void *opaque)
+{
+    return object_property_get_bool(qdev_get_machine(), "ras", NULL);
+}
+
+static const VMStateDescription vmstate_ghes_state = {
+    .name = "acpi-ged/ghes",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = ghes_needed,
+    .fields      = (VMStateField[]) {
+        VMSTATE_STRUCT(ghes_state, AcpiGedState, 1, vmstate_ghes_state, AcpiGhesState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 static const VMStateDescription vmstate_acpi_ged = {
     .name = "acpi-ged",
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
-        VMSTATE_STRUCT(ged_state, AcpiGedState, 1, vmstate_ged_state, GEDState),
+        VMSTATE_STRUCT(ged_state, AcpiGedState, 1,
+                       vmstate_ged_state, GEDState),
         VMSTATE_END_OF_LIST(),
     },
     .subsections = (const VMStateDescription * []) {
         &vmstate_memhp_state,
+        &vmstate_ghes_state,
         NULL
     }
 };
diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
index a67b1de..3bf32ec 100644
--- a/hw/acpi/ghes.c
+++ b/hw/acpi/ghes.c
@@ -24,6 +24,7 @@
 #include "hw/acpi/acpi.h"
 #include "hw/acpi/ghes.h"
 #include "hw/acpi/aml-build.h"
+#include "hw/acpi/generic_event_device.h"
 #include "hw/nvram/fw_cfg.h"
 #include "sysemu/sysemu.h"
 #include "qemu/error-report.h"
@@ -216,3 +217,18 @@ void acpi_build_hest(GArray *table_data, BIOSLinker *linker)
     build_header(linker, table_data, (void *)(table_data->data + hest_start),
         "HEST", table_data->len - hest_start, 1, NULL, "");
 }
+
+void acpi_ghes_add_fw_cfg(AcpiGhesState *ags, FWCfgState *s,
+                          GArray *hardware_error)
+{
+    size_t size = 2 * sizeof(uint64_t) + ACPI_GHES_MAX_RAW_DATA_LENGTH;
+    size_t request_block_size = ACPI_GHES_ERROR_SOURCE_COUNT * size;
+
+    /* Create a read-only fw_cfg file for GHES */
+    fw_cfg_add_file(s, ACPI_GHES_ERRORS_FW_CFG_FILE, hardware_error->data,
+                    request_block_size);
+
+    /* Create a read-write fw_cfg file for Address */
+    fw_cfg_add_file_callback(s, ACPI_GHES_DATA_ADDR_FW_CFG_FILE, NULL, NULL,
+        NULL, &(ags->ghes_addr_le), sizeof(ags->ghes_addr_le), false);
+}
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 12a9a78..d6e7521 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -832,6 +832,7 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
     build_spcr(tables_blob, tables->linker, vms);

     if (vms->ras) {
+        assert(vms->acpi_dev);
         acpi_add_table(table_offsets, tables_blob);
         build_ghes_error_table(tables->hardware_errors, tables->linker);
         acpi_build_hest(tables_blob, tables->linker);
@@ -924,6 +925,7 @@ void virt_acpi_setup(VirtMachineState *vms)
 {
     AcpiBuildTables tables;
     AcpiBuildState *build_state;
+    AcpiGedState *acpi_ged_state;

     if (!vms->fw_cfg) {
         trace_virt_acpi_setup();
@@ -954,6 +956,14 @@ 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));

+    if (vms->ras) {
+        assert(vms->acpi_dev);
+        acpi_ged_state = ACPI_GED(object_resolve_path_type("", TYPE_ACPI_GED,
+                                                           NULL));
+        acpi_ghes_add_fw_cfg(&acpi_ged_state->ghes_state,
+                             vms->fw_cfg, tables.hardware_errors);
+    }
+
     build_state->rsdp_mr = acpi_add_rom_blob(virt_acpi_build_update,
                                              build_state, tables.rsdp,
                                              ACPI_BUILD_RSDP_FILE, 0);
diff --git a/include/hw/acpi/generic_event_device.h b/include/hw/acpi/generic_event_device.h
index d157eac..037d2b5 100644
--- a/include/hw/acpi/generic_event_device.h
+++ b/include/hw/acpi/generic_event_device.h
@@ -61,6 +61,7 @@

 #include "hw/sysbus.h"
 #include "hw/acpi/memory_hotplug.h"
+#include "hw/acpi/ghes.h"

 #define ACPI_POWER_BUTTON_DEVICE "PWRB"

@@ -95,6 +96,7 @@ typedef struct AcpiGedState {
     GEDState ged_state;
     uint32_t ged_event_bitmap;
     qemu_irq irq;
+    AcpiGhesState ghes_state;
 } AcpiGedState;

 void build_ged_aml(Aml *table, const char* name, HotplugHandler *hotplug_dev,
diff --git a/include/hw/acpi/ghes.h b/include/hw/acpi/ghes.h
index 18debd8..a3420fc 100644
--- a/include/hw/acpi/ghes.h
+++ b/include/hw/acpi/ghes.h
@@ -62,6 +62,12 @@ enum {
     ACPI_HEST_SRC_ID_RESERVED,
 };

+typedef struct AcpiGhesState {
+    uint64_t ghes_addr_le;
+} AcpiGhesState;
+
 void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker);
 void acpi_build_hest(GArray *table_data, BIOSLinker *linker);
+void acpi_ghes_add_fw_cfg(AcpiGhesState *vms, FWCfgState *s,
+                          GArray *hardware_errors);
 #endif


> 
> thanks
> -- PMM
> .
>