[PATCH v3 0/5] Change ghes driver to use HEST-based offsets

[PATCH v3 0/5] Change ghes driver to use HEST-based offsets

[Mauro Carvalho Chehab]

This  series was part of the previous PR to add generic error injection
support on GHES. It depends on a cleanup patch series sent earlier
today:

    https://lore.kernel.org/qemu-devel/cover.1733297707.git.mchehab+huawei@kernel.org/T/#t

It contains the changes of the math used to calculate offsets at HEST table 
and hardware_error firmware file. It prepares for the addition of GHES
error injection.

The first patch was previously at the cleanup series. It prepares
the logic to support multiple sources.

The second patch adds a new firmware file to store HEST address.

The third patch use the new firmware to calculate offsets using
HEST table.

Patches 4 and 5 add migration support. They assume that this
series will be merged for qemu 9.2 (maybe it is too late for that,
as QEMU is now on soft freeze). 

I tested migration using both virt-9.1 and virt-9.2 machines
on qemu 9.2.

I also tested migration with:

	qemu-9.1 -M virt-9.1 -cpu cortex-a57 => qemu-9.2 -M virt-9.1 -cpu cortex-a57
	qemu-9.2 -M virt-9.1 -cpu cortex-a57 => qemu-9.1 -M virt-9.1 -cpu cortex-a57 

The full qemu command when test backward-compatibility when running virt-9.1 is:


~/qemu/build/qemu-system-aarch64 \
-m 4g,maxmem=8G,slots=8 -monitor stdio -no-reboot -bios ~/emulator/QEMU_EFI-silent.fd -kernel~/kernel/arm64_build/arch/arm64/boot/Image.gz -device pcie-root-port,id=root_port1 -device virtio-blk-pci,drive=hd -device virtio-net-pci,netdev=mynet,id=bob -drive if=none,file=~/emulator/debian.qcow2,format=qcow2,id=hd -object memory-backend-ram,size=4G,id=mem0 -netdev type=user,id=mynet,hostfwd=tcp::5555-:22 -qmp tcp:localhost:4445,server=on,wait=off -M virt-9.1,nvdimm=on,gic-version=3,ras=on -cpu max -smp 4 -numa node,nodeid=0,cpus=0-3,memdev=mem0 -append 'earlycon nomodeset root=/dev/vda1 fsck.mode=skip tp_printk maxcpus=4'

(I actually call it from two different directories, one with qemu-9.1 and the other one with qemu-9.2.

For tests on qemu-9.2 with virt-9.2, I used a similar command:

~/qemu/build/qemu-system-aarch64 -m 4g,maxmem=8G,slots=8 -monitor stdio -no-reboot -bios ~/emulator/QEMU_EFI-silent.fd -kernel ~/kernel/arm64_build/arch/arm64/boot/Image.gz -device pcie-root-port,id=root_port1 -device virtio-blk-pci,drive=hd -device virtio-net-pci,netdev=mynet,id=bob -drive if=none,file=~/emulator/debian.qcow2,format=qcow2,id=hd -object memory-backend-ram,size=4G,id=mem0 -netdev type=user,id=mynet,hostfwd=tcp::5555-:22 -qmp tcp:localhost:4445,server=on,wait=off -M virt-9.2,nvdimm=on,gic-version=3,ras=on -cpu max -smp 4 -numa node,nodeid=0,cpus=0-3,memdev=mem0 -append 'earlycon nomodeset root=/dev/vda1 fsck.mode=skip tp_printk maxcpus=4'

---

v3: did some minor cleanups at the code, as suggested by Jonathan Cameron.

v2:
  - some whitespace and comment changes
  - patch 3/6 (acpi/ghes: rename the function which gets hw error offsets)
    was merged on the cleanup series.

Mauro Carvalho Chehab (5):
  acpi/ghes: Prepare to support multiple sources on ghes
  acpi/ghes: add a firmware file with HEST address
  acpi/ghes: Use HEST table offsets when preparing GHES records
  acpi/generic_event_device: Update GHES migration to cover hest addr
  acpi/generic_event_device: add logic to detect if HEST addr is
    available

 hw/acpi/generic_event_device.c |  30 +++++++
 hw/acpi/ghes.c                 | 160 +++++++++++++++++++++++++++++----
 hw/arm/virt-acpi-build.c       |  33 ++++++-
 hw/core/machine.c              |   2 +
 include/hw/acpi/ghes.h         |  23 +++--
 5 files changed, 220 insertions(+), 28 deletions(-)

-- 
2.47.1

[PATCH v3 1/5] acpi/ghes: Prepare to support multiple sources on ghes

[Mauro Carvalho Chehab]

The current code is actually dependent on having just one error
structure with a single source.

As the number of sources should be arch-dependent, as it will depend on
what kind of synchronous/assynchronous notifications will exist, change
the logic to dynamically build the table.

Yet, for a proper support, we need to get the number of sources by
reading the number from the HEST table. However, bios currently doesn't
store a pointer to it.

For now just change the logic at table build time, while enforcing that
it will behave like before with a single source ID.

A future patch will add a HEST table bios pointer and change the logic
at acpi_ghes_record_errors() to dynamically use the new size.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 hw/acpi/ghes.c           | 43 ++++++++++++++++++++++++++--------------
 hw/arm/virt-acpi-build.c |  5 +++++
 include/hw/acpi/ghes.h   | 21 +++++++++++++-------
 3 files changed, 47 insertions(+), 22 deletions(-)

diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
index 5efa50413af3..b77e5c9d1b19 100644
--- a/hw/acpi/ghes.c
+++ b/hw/acpi/ghes.c
@@ -206,17 +206,26 @@ ghes_gen_err_data_uncorrectable_recoverable(GArray *block,
  * Initialize "etc/hardware_errors" and "etc/hardware_errors_addr" fw_cfg blobs.
  * See docs/specs/acpi_hest_ghes.rst for blobs format.
  */
-static void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker)
+static void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker,
+                                   int num_sources)
 {
     int i, error_status_block_offset;
 
+    /*
+     * TODO: Current version supports only one source.
+     * A further patch will drop this check, after adding a proper migration
+     * code, as, for the code to work, we need to store a bios pointer to the
+     * HEST table.
+     */
+    assert(num_sources == 1);
+
     /* Build error_block_address */
-    for (i = 0; i < ACPI_GHES_ERROR_SOURCE_COUNT; i++) {
+    for (i = 0; i < num_sources; i++) {
         build_append_int_noprefix(hardware_errors, 0, sizeof(uint64_t));
     }
 
     /* Build read_ack_register */
-    for (i = 0; i < ACPI_GHES_ERROR_SOURCE_COUNT; i++) {
+    for (i = 0; i < num_sources; i++) {
         /*
          * Initialize the value of read_ack_register to 1, so GHES can be
          * writable after (re)boot.
@@ -231,13 +240,13 @@ static void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker)
 
     /* Reserve space for Error Status Data Block */
     acpi_data_push(hardware_errors,
-        ACPI_GHES_MAX_RAW_DATA_LENGTH * ACPI_GHES_ERROR_SOURCE_COUNT);
+        ACPI_GHES_MAX_RAW_DATA_LENGTH * num_sources);
 
     /* Tell guest firmware to place hardware_errors blob into RAM */
     bios_linker_loader_alloc(linker, ACPI_HW_ERROR_FW_CFG_FILE,
                              hardware_errors, sizeof(uint64_t), false);
 
-    for (i = 0; i < ACPI_GHES_ERROR_SOURCE_COUNT; i++) {
+    for (i = 0; i < num_sources; i++) {
         /*
          * Tell firmware to patch error_block_address entries to point to
          * corresponding "Generic Error Status Block"
@@ -263,10 +272,12 @@ static void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker)
 /* Build Generic Hardware Error Source version 2 (GHESv2) */
 static void build_ghes_v2(GArray *table_data,
                           BIOSLinker *linker,
-                          enum AcpiGhesNotifyType notify,
-                          uint16_t source_id)
+                          const AcpiNotificationSourceId *notif_src,
+                          uint16_t index, int num_sources)
 {
     uint64_t address_offset;
+    const uint16_t notify = notif_src->notify;
+    const uint16_t source_id = notif_src->source_id;
 
     /*
      * Type:
@@ -297,7 +308,7 @@ static void build_ghes_v2(GArray *table_data,
                                    address_offset + GAS_ADDR_OFFSET,
                                    sizeof(uint64_t),
                                    ACPI_HW_ERROR_FW_CFG_FILE,
-                                   source_id * sizeof(uint64_t));
+                                   index * sizeof(uint64_t));
 
     /* Notification Structure */
     build_ghes_hw_error_notification(table_data, notify);
@@ -317,8 +328,7 @@ static void build_ghes_v2(GArray *table_data,
                                    address_offset + GAS_ADDR_OFFSET,
                                    sizeof(uint64_t),
                                    ACPI_HW_ERROR_FW_CFG_FILE,
-                                   (ACPI_GHES_ERROR_SOURCE_COUNT + source_id)
-                                   * sizeof(uint64_t));
+                                   (num_sources + index) * sizeof(uint64_t));
 
     /*
      * Read Ack Preserve field
@@ -333,19 +343,23 @@ static void build_ghes_v2(GArray *table_data,
 /* Build Hardware Error Source Table */
 void acpi_build_hest(GArray *table_data, GArray *hardware_errors,
                      BIOSLinker *linker,
+                     const AcpiNotificationSourceId * const notif_source,
+                     int num_sources,
                      const char *oem_id, const char *oem_table_id)
 {
     AcpiTable table = { .sig = "HEST", .rev = 1,
                         .oem_id = oem_id, .oem_table_id = oem_table_id };
+    int i;
 
-    build_ghes_error_table(hardware_errors, linker);
+    build_ghes_error_table(hardware_errors, linker, num_sources);
 
     acpi_table_begin(&table, table_data);
 
     /* Error Source Count */
-    build_append_int_noprefix(table_data, ACPI_GHES_ERROR_SOURCE_COUNT, 4);
-    build_ghes_v2(table_data, linker,
-                  ACPI_GHES_NOTIFY_SEA, ACPI_HEST_SRC_ID_SEA);
+    build_append_int_noprefix(table_data, num_sources, 4);
+    for (i = 0; i < num_sources; i++) {
+        build_ghes_v2(table_data, linker, &notif_source[i], i, num_sources);
+    }
 
     acpi_table_end(linker, &table);
 }
@@ -410,7 +424,6 @@ void ghes_record_cper_errors(const void *cper, size_t len,
     }
     ags = &acpi_ged_state->ghes_state;
 
-    assert(ACPI_GHES_ERROR_SOURCE_COUNT == 1);
     get_hw_error_offsets(le64_to_cpu(ags->hw_error_le),
                          &cper_addr, &read_ack_register_addr);
 
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index e059317b002e..bd5582bc75f8 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -889,6 +889,10 @@ static void acpi_align_size(GArray *blob, unsigned align)
     g_array_set_size(blob, ROUND_UP(acpi_data_len(blob), align));
 }
 
+static const AcpiNotificationSourceId hest_ghes_notify[] = {
+    { ACPI_HEST_SRC_ID_SYNC, ACPI_GHES_NOTIFY_SEA },
+};
+
 static
 void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
 {
@@ -944,6 +948,7 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
     if (vms->ras) {
         acpi_add_table(table_offsets, tables_blob);
         acpi_build_hest(tables_blob, tables->hardware_errors, tables->linker,
+                        hest_ghes_notify, ARRAY_SIZE(hest_ghes_notify),
                         vms->oem_id, vms->oem_table_id);
     }
 
diff --git a/include/hw/acpi/ghes.h b/include/hw/acpi/ghes.h
index 39619a2457cb..9f0120d0d596 100644
--- a/include/hw/acpi/ghes.h
+++ b/include/hw/acpi/ghes.h
@@ -57,20 +57,27 @@ enum AcpiGhesNotifyType {
     ACPI_GHES_NOTIFY_RESERVED = 12
 };
 
-enum {
-    ACPI_HEST_SRC_ID_SEA = 0,
-    /* future ids go here */
-
-    ACPI_GHES_ERROR_SOURCE_COUNT
-};
-
 typedef struct AcpiGhesState {
     uint64_t hw_error_le;
     bool present; /* True if GHES is present at all on this board */
 } AcpiGhesState;
 
+/*
+ * ID numbers used to fill HEST source ID field
+ */
+enum AcpiGhesSourceID {
+    ACPI_HEST_SRC_ID_SYNC,
+};
+
+typedef struct AcpiNotificationSourceId {
+    enum AcpiGhesSourceID source_id;
+    enum AcpiGhesNotifyType notify;
+} AcpiNotificationSourceId;
+
 void acpi_build_hest(GArray *table_data, GArray *hardware_errors,
                      BIOSLinker *linker,
+                     const AcpiNotificationSourceId * const notif_source,
+                     int num_sources,
                      const char *oem_id, const char *oem_table_id);
 void acpi_ghes_add_fw_cfg(AcpiGhesState *vms, FWCfgState *s,
                           GArray *hardware_errors);
-- 
2.47.1

[PATCH v3 2/5] acpi/ghes: add a firmware file with HEST address

[Mauro Carvalho Chehab]

Store HEST table address at GPA, placing its content at
hest_addr_le variable.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

---

Change from v8:
- hest_addr_lr is now pointing to the error source size and data.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 hw/acpi/ghes.c         | 17 ++++++++++++++++-
 include/hw/acpi/ghes.h |  1 +
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
index b77e5c9d1b19..4a826c8ca6d4 100644
--- a/hw/acpi/ghes.c
+++ b/hw/acpi/ghes.c
@@ -30,6 +30,7 @@
 
 #define ACPI_HW_ERROR_FW_CFG_FILE           "etc/hardware_errors"
 #define ACPI_HW_ERROR_ADDR_FW_CFG_FILE      "etc/hardware_errors_addr"
+#define ACPI_HEST_ADDR_FW_CFG_FILE          "etc/acpi_table_hest_addr"
 
 /* The max size in bytes for one error block */
 #define ACPI_GHES_MAX_RAW_DATA_LENGTH   (1 * KiB)
@@ -261,7 +262,7 @@ static void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker,
     }
 
     /*
-     * tell firmware to write hardware_errors GPA into
+     * Tell firmware to write hardware_errors GPA into
      * hardware_errors_addr fw_cfg, once the former has been initialized.
      */
     bios_linker_loader_write_pointer(linker, ACPI_HW_ERROR_ADDR_FW_CFG_FILE, 0,
@@ -355,6 +356,8 @@ void acpi_build_hest(GArray *table_data, GArray *hardware_errors,
 
     acpi_table_begin(&table, table_data);
 
+    int hest_offset = table_data->len;
+
     /* Error Source Count */
     build_append_int_noprefix(table_data, num_sources, 4);
     for (i = 0; i < num_sources; i++) {
@@ -362,6 +365,15 @@ void acpi_build_hest(GArray *table_data, GArray *hardware_errors,
     }
 
     acpi_table_end(linker, &table);
+
+    /*
+     * tell firmware to write into GPA the address of HEST via fw_cfg,
+     * once initialized.
+     */
+    bios_linker_loader_write_pointer(linker,
+                                     ACPI_HEST_ADDR_FW_CFG_FILE, 0,
+                                     sizeof(uint64_t),
+                                     ACPI_BUILD_TABLE_FILE, hest_offset);
 }
 
 void acpi_ghes_add_fw_cfg(AcpiGhesState *ags, FWCfgState *s,
@@ -375,6 +387,9 @@ void acpi_ghes_add_fw_cfg(AcpiGhesState *ags, FWCfgState *s,
     fw_cfg_add_file_callback(s, ACPI_HW_ERROR_ADDR_FW_CFG_FILE, NULL, NULL,
         NULL, &(ags->hw_error_le), sizeof(ags->hw_error_le), false);
 
+    fw_cfg_add_file_callback(s, ACPI_HEST_ADDR_FW_CFG_FILE, NULL, NULL,
+        NULL, &(ags->hest_addr_le), sizeof(ags->hest_addr_le), false);
+
     ags->present = true;
 }
 
diff --git a/include/hw/acpi/ghes.h b/include/hw/acpi/ghes.h
index 9f0120d0d596..237721fec0a2 100644
--- a/include/hw/acpi/ghes.h
+++ b/include/hw/acpi/ghes.h
@@ -58,6 +58,7 @@ enum AcpiGhesNotifyType {
 };
 
 typedef struct AcpiGhesState {
+    uint64_t hest_addr_le;
     uint64_t hw_error_le;
     bool present; /* True if GHES is present at all on this board */
 } AcpiGhesState;
-- 
2.47.1

[PATCH v3 3/5] acpi/ghes: Use HEST table offsets when preparing GHES records

[Mauro Carvalho Chehab]

There are two pointers that are needed during error injection:

1. The start address of the CPER block to be stored;
2. The address of the ack, which needs a reset before next error.

It is preferable to calculate them from the HEST table.  This allows
checking the source ID, the size of the table and the type of the
HEST error block structures.

Yet, keep the old code, as this is needed for migration purposes.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 hw/acpi/ghes.c | 106 ++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 96 insertions(+), 10 deletions(-)

diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
index 4a826c8ca6d4..af55bfe106bf 100644
--- a/hw/acpi/ghes.c
+++ b/hw/acpi/ghes.c
@@ -61,6 +61,25 @@
  */
 #define ACPI_GHES_GESB_SIZE                 20
 
+/*
+ * Offsets with regards to the start of the HEST table stored at
+ * ags->hest_addr_le, according with the memory layout map at
+ * docs/specs/acpi_hest_ghes.rst.
+ */
+
+/*
+ * ACPI 6.2: 18.3.2.8 Generic Hardware Error Source version 2
+ * Table 18-382 Generic Hardware Error Source version 2 (GHESv2) Structure
+ */
+#define HEST_GHES_V2_TABLE_SIZE  92
+#define GHES_ACK_OFFSET          (64 + GAS_ADDR_OFFSET)
+
+/*
+ * ACPI 6.2: 18.3.2.7: Generic Hardware Error Source
+ * Table 18-380: 'Error Status Address' field
+ */
+#define GHES_ERR_ST_ADDR_OFFSET  (20 + GAS_ADDR_OFFSET)
+
 /*
  * Values for error_severity field
  */
@@ -212,14 +231,6 @@ static void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker,
 {
     int i, error_status_block_offset;
 
-    /*
-     * TODO: Current version supports only one source.
-     * A further patch will drop this check, after adding a proper migration
-     * code, as, for the code to work, we need to store a bios pointer to the
-     * HEST table.
-     */
-    assert(num_sources == 1);
-
     /* Build error_block_address */
     for (i = 0; i < num_sources; i++) {
         build_append_int_noprefix(hardware_errors, 0, sizeof(uint64_t));
@@ -419,6 +430,76 @@ static void get_hw_error_offsets(uint64_t ghes_addr,
     *read_ack_register_addr = ghes_addr + sizeof(uint64_t);
 }
 
+static void get_ghes_source_offsets(uint16_t source_id, uint64_t hest_addr,
+                                    uint64_t *cper_addr,
+                                    uint64_t *read_ack_start_addr,
+                                    Error **errp)
+{
+    uint64_t hest_err_block_addr, hest_read_ack_addr;
+    uint64_t err_source_struct, error_block_addr;
+    uint32_t num_sources, i;
+
+    if (!hest_addr) {
+        return;
+    }
+
+    cpu_physical_memory_read(hest_addr, &num_sources, sizeof(num_sources));
+    num_sources = le32_to_cpu(num_sources);
+
+    err_source_struct = hest_addr + sizeof(num_sources);
+
+    /*
+     * Currently, HEST Error source navigates only for GHESv2 tables
+     */
+
+    for (i = 0; i < num_sources; i++) {
+        uint64_t addr = err_source_struct;
+        uint16_t type, src_id;
+
+        cpu_physical_memory_read(addr, &type, sizeof(type));
+        type = le16_to_cpu(type);
+
+        /* For now, we only know the size of GHESv2 table */
+        if (type != ACPI_GHES_SOURCE_GENERIC_ERROR_V2) {
+            error_setg(errp, "HEST: type %d not supported.", type);
+            return;
+        }
+
+        /* Compare CPER source address at the GHESv2 structure */
+        addr += sizeof(type);
+        cpu_physical_memory_read(addr, &src_id, sizeof(src_id));
+
+        if (src_id == source_id) {
+            break;
+        }
+
+        err_source_struct += HEST_GHES_V2_TABLE_SIZE;
+    }
+    if (i == num_sources) {
+        error_setg(errp, "HEST: Source %d not found.", source_id);
+        return;
+    }
+
+    /* Navigate though table address pointers */
+    hest_err_block_addr = err_source_struct + GHES_ERR_ST_ADDR_OFFSET;
+    hest_read_ack_addr = err_source_struct + GHES_ACK_OFFSET;
+
+    cpu_physical_memory_read(hest_err_block_addr, &error_block_addr,
+                             sizeof(error_block_addr));
+
+    error_block_addr =  le64_to_cpu(error_block_addr);
+
+    cpu_physical_memory_read(error_block_addr, cper_addr,
+                             sizeof(*cper_addr));
+
+    *cper_addr = le64_to_cpu(*cper_addr);
+
+    cpu_physical_memory_read(hest_read_ack_addr, read_ack_start_addr,
+                             sizeof(*read_ack_start_addr));
+
+    *read_ack_start_addr = le64_to_cpu(*read_ack_start_addr);
+}
+
 void ghes_record_cper_errors(const void *cper, size_t len,
                              uint16_t source_id, Error **errp)
 {
@@ -439,8 +520,13 @@ void ghes_record_cper_errors(const void *cper, size_t len,
     }
     ags = &acpi_ged_state->ghes_state;
 
-    get_hw_error_offsets(le64_to_cpu(ags->hw_error_le),
-                         &cper_addr, &read_ack_register_addr);
+    if (!ags->hest_addr_le) {
+        get_hw_error_offsets(le64_to_cpu(ags->hw_error_le),
+                             &cper_addr, &read_ack_register_addr);
+    } else {
+        get_ghes_source_offsets(source_id, le64_to_cpu(ags->hest_addr_le),
+                                &cper_addr, &read_ack_register_addr, errp);
+    }
 
     if (!cper_addr) {
         error_setg(errp, "can not find Generic Error Status Block");
-- 
2.47.1

[PATCH v3 4/5] acpi/generic_event_device: Update GHES migration to cover hest addr

[Mauro Carvalho Chehab]

The GHES migration logic at GED should now support HEST table
location too.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 hw/acpi/generic_event_device.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
index 17baf36132a8..c1116dd8d7ae 100644
--- a/hw/acpi/generic_event_device.c
+++ b/hw/acpi/generic_event_device.c
@@ -387,6 +387,34 @@ static const VMStateDescription vmstate_ghes_state = {
     }
 };
 
+static const VMStateDescription vmstate_hest = {
+    .name = "acpi-hest",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (const VMStateField[]) {
+        VMSTATE_UINT64(hest_addr_le, AcpiGhesState),
+        VMSTATE_END_OF_LIST()
+    },
+};
+
+static bool hest_needed(void *opaque)
+{
+    AcpiGedState *s = opaque;
+    return s->ghes_state.hest_addr_le;
+}
+
+static const VMStateDescription vmstate_hest_state = {
+    .name = "acpi-ged/hest",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = hest_needed,
+    .fields = (const VMStateField[]) {
+        VMSTATE_STRUCT(ghes_state, AcpiGedState, 1,
+                       vmstate_hest, AcpiGhesState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 static const VMStateDescription vmstate_acpi_ged = {
     .name = "acpi-ged",
     .version_id = 1,
@@ -399,6 +427,7 @@ static const VMStateDescription vmstate_acpi_ged = {
         &vmstate_memhp_state,
         &vmstate_cpuhp_state,
         &vmstate_ghes_state,
+        &vmstate_hest_state,
         NULL
     }
 };
-- 
2.47.1

[PATCH v3 5/5] acpi/generic_event_device: add logic to detect if HEST addr is available

[Mauro Carvalho Chehab]

Create a new property (x-has-hest-addr) and use it to detect if
the GHES table offsets can be calculated from the HEST address
(qemu 9.2 and upper) or via the legacy way via an offset obtained
from the hardware_errors firmware file.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 hw/acpi/generic_event_device.c |  1 +
 hw/acpi/ghes.c                 | 24 +++++++++++++++++-------
 hw/arm/virt-acpi-build.c       | 30 ++++++++++++++++++++++++++----
 hw/core/machine.c              |  2 ++
 include/hw/acpi/ghes.h         |  1 +
 5 files changed, 47 insertions(+), 11 deletions(-)

diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
index c1116dd8d7ae..df6b4fab2d30 100644
--- a/hw/acpi/generic_event_device.c
+++ b/hw/acpi/generic_event_device.c
@@ -318,6 +318,7 @@ static void acpi_ged_send_event(AcpiDeviceIf *adev, AcpiEventStatusBits ev)
 
 static Property acpi_ged_properties[] = {
     DEFINE_PROP_UINT32("ged-event", AcpiGedState, ged_event_bitmap, 0),
+    DEFINE_PROP_BOOL("x-has-hest-addr", AcpiGedState, ghes_state.hest_lookup, true),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
index af55bfe106bf..c9295a3b0db7 100644
--- a/hw/acpi/ghes.c
+++ b/hw/acpi/ghes.c
@@ -361,6 +361,8 @@ void acpi_build_hest(GArray *table_data, GArray *hardware_errors,
 {
     AcpiTable table = { .sig = "HEST", .rev = 1,
                         .oem_id = oem_id, .oem_table_id = oem_table_id };
+    AcpiGedState *acpi_ged_state;
+    AcpiGhesState *ags;
     int i;
 
     build_ghes_error_table(hardware_errors, linker, num_sources);
@@ -381,10 +383,16 @@ void acpi_build_hest(GArray *table_data, GArray *hardware_errors,
      * tell firmware to write into GPA the address of HEST via fw_cfg,
      * once initialized.
      */
-    bios_linker_loader_write_pointer(linker,
-                                     ACPI_HEST_ADDR_FW_CFG_FILE, 0,
-                                     sizeof(uint64_t),
-                                     ACPI_BUILD_TABLE_FILE, hest_offset);
+
+    acpi_ged_state = ACPI_GED(object_resolve_path_type("", TYPE_ACPI_GED,
+                                                       NULL));
+    ags = &acpi_ged_state->ghes_state;
+    if (ags->hest_lookup) {
+        bios_linker_loader_write_pointer(linker,
+                                         ACPI_HEST_ADDR_FW_CFG_FILE, 0,
+                                         sizeof(uint64_t),
+                                         ACPI_BUILD_TABLE_FILE, hest_offset);
+    }
 }
 
 void acpi_ghes_add_fw_cfg(AcpiGhesState *ags, FWCfgState *s,
@@ -398,8 +406,10 @@ void acpi_ghes_add_fw_cfg(AcpiGhesState *ags, FWCfgState *s,
     fw_cfg_add_file_callback(s, ACPI_HW_ERROR_ADDR_FW_CFG_FILE, NULL, NULL,
         NULL, &(ags->hw_error_le), sizeof(ags->hw_error_le), false);
 
-    fw_cfg_add_file_callback(s, ACPI_HEST_ADDR_FW_CFG_FILE, NULL, NULL,
-        NULL, &(ags->hest_addr_le), sizeof(ags->hest_addr_le), false);
+    if (ags->hest_lookup) {
+        fw_cfg_add_file_callback(s, ACPI_HEST_ADDR_FW_CFG_FILE, NULL, NULL,
+            NULL, &(ags->hest_addr_le), sizeof(ags->hest_addr_le), false);
+    }
 
     ags->present = true;
 }
@@ -520,7 +530,7 @@ void ghes_record_cper_errors(const void *cper, size_t len,
     }
     ags = &acpi_ged_state->ghes_state;
 
-    if (!ags->hest_addr_le) {
+    if (!ags->hest_lookup) {
         get_hw_error_offsets(le64_to_cpu(ags->hw_error_le),
                              &cper_addr, &read_ack_register_addr);
     } else {
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index bd5582bc75f8..46ce3f3bb07a 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -893,6 +893,10 @@ static const AcpiNotificationSourceId hest_ghes_notify[] = {
     { ACPI_HEST_SRC_ID_SYNC, ACPI_GHES_NOTIFY_SEA },
 };
 
+static const AcpiNotificationSourceId hest_ghes_notify_9_1[] = {
+    { ACPI_HEST_SRC_ID_SYNC, ACPI_GHES_NOTIFY_SEA },
+};
+
 static
 void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
 {
@@ -946,10 +950,28 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
     build_dbg2(tables_blob, tables->linker, vms);
 
     if (vms->ras) {
-        acpi_add_table(table_offsets, tables_blob);
-        acpi_build_hest(tables_blob, tables->hardware_errors, tables->linker,
-                        hest_ghes_notify, ARRAY_SIZE(hest_ghes_notify),
-                        vms->oem_id, vms->oem_table_id);
+        AcpiGhesState *ags;
+        AcpiGedState *acpi_ged_state;
+
+        acpi_ged_state = ACPI_GED(object_resolve_path_type("", TYPE_ACPI_GED,
+                                                       NULL));
+        if (acpi_ged_state) {
+            ags = &acpi_ged_state->ghes_state;
+
+            acpi_add_table(table_offsets, tables_blob);
+
+            if (!ags->hest_lookup) {
+                acpi_build_hest(tables_blob, tables->hardware_errors,
+                                tables->linker, hest_ghes_notify_9_1,
+                                ARRAY_SIZE(hest_ghes_notify_9_1),
+                                vms->oem_id, vms->oem_table_id);
+            } else {
+                acpi_build_hest(tables_blob, tables->hardware_errors,
+                                tables->linker, hest_ghes_notify,
+                                ARRAY_SIZE(hest_ghes_notify),
+                                vms->oem_id, vms->oem_table_id);
+            }
+        }
     }
 
     if (ms->numa_state->num_nodes > 0) {
diff --git a/hw/core/machine.c b/hw/core/machine.c
index f29fe959647f..b81fea273e6b 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -34,10 +34,12 @@
 #include "hw/virtio/virtio-pci.h"
 #include "hw/virtio/virtio-net.h"
 #include "hw/virtio/virtio-iommu.h"
+#include "hw/acpi/generic_event_device.h"
 #include "audio/audio.h"
 
 GlobalProperty hw_compat_9_1[] = {
     { TYPE_PCI_DEVICE, "x-pcie-ext-tag", "false" },
+    { TYPE_ACPI_GED, "x-has-hest-addr", "false" },
 };
 const size_t hw_compat_9_1_len = G_N_ELEMENTS(hw_compat_9_1);
 
diff --git a/include/hw/acpi/ghes.h b/include/hw/acpi/ghes.h
index 237721fec0a2..164ed8b0f9a3 100644
--- a/include/hw/acpi/ghes.h
+++ b/include/hw/acpi/ghes.h
@@ -61,6 +61,7 @@ typedef struct AcpiGhesState {
     uint64_t hest_addr_le;
     uint64_t hw_error_le;
     bool present; /* True if GHES is present at all on this board */
+    bool hest_lookup; /* True if HEST address is present */
 } AcpiGhesState;
 
 /*
-- 
2.47.1

Re: [PATCH v3 0/5] Change ghes driver to use HEST-based offsets

[Michael S. Tsirkin]

On Wed, Dec 04, 2024 at 04:57:54PM +0100, Mauro Carvalho Chehab wrote:
> This  series was part of the previous PR to add generic error injection
> support on GHES. It depends on a cleanup patch series sent earlier
> today:
> 
>     https://lore.kernel.org/qemu-devel/cover.1733297707.git.mchehab+huawei@kernel.org/T/#t
> 
> It contains the changes of the math used to calculate offsets at HEST table 
> and hardware_error firmware file. It prepares for the addition of GHES
> error injection.
> 
> The first patch was previously at the cleanup series. It prepares
> the logic to support multiple sources.
> 
> The second patch adds a new firmware file to store HEST address.
> 
> The third patch use the new firmware to calculate offsets using
> HEST table.
> 
> Patches 4 and 5 add migration support. They assume that this
> series will be merged for qemu 9.2 (maybe it is too late for that,
> as QEMU is now on soft freeze). 
> 
> I tested migration using both virt-9.1 and virt-9.2 machines
> on qemu 9.2.

So this needs a rebase to the next release. Thanks!


> I also tested migration with:
> 
> 	qemu-9.1 -M virt-9.1 -cpu cortex-a57 => qemu-9.2 -M virt-9.1 -cpu cortex-a57
> 	qemu-9.2 -M virt-9.1 -cpu cortex-a57 => qemu-9.1 -M virt-9.1 -cpu cortex-a57 
> 
> The full qemu command when test backward-compatibility when running virt-9.1 is:
> 
> 
> ~/qemu/build/qemu-system-aarch64 \
> -m 4g,maxmem=8G,slots=8 -monitor stdio -no-reboot -bios ~/emulator/QEMU_EFI-silent.fd -kernel~/kernel/arm64_build/arch/arm64/boot/Image.gz -device pcie-root-port,id=root_port1 -device virtio-blk-pci,drive=hd -device virtio-net-pci,netdev=mynet,id=bob -drive if=none,file=~/emulator/debian.qcow2,format=qcow2,id=hd -object memory-backend-ram,size=4G,id=mem0 -netdev type=user,id=mynet,hostfwd=tcp::5555-:22 -qmp tcp:localhost:4445,server=on,wait=off -M virt-9.1,nvdimm=on,gic-version=3,ras=on -cpu max -smp 4 -numa node,nodeid=0,cpus=0-3,memdev=mem0 -append 'earlycon nomodeset root=/dev/vda1 fsck.mode=skip tp_printk maxcpus=4'
> 
> (I actually call it from two different directories, one with qemu-9.1 and the other one with qemu-9.2.
> 
> For tests on qemu-9.2 with virt-9.2, I used a similar command:
> 
> ~/qemu/build/qemu-system-aarch64 -m 4g,maxmem=8G,slots=8 -monitor stdio -no-reboot -bios ~/emulator/QEMU_EFI-silent.fd -kernel ~/kernel/arm64_build/arch/arm64/boot/Image.gz -device pcie-root-port,id=root_port1 -device virtio-blk-pci,drive=hd -device virtio-net-pci,netdev=mynet,id=bob -drive if=none,file=~/emulator/debian.qcow2,format=qcow2,id=hd -object memory-backend-ram,size=4G,id=mem0 -netdev type=user,id=mynet,hostfwd=tcp::5555-:22 -qmp tcp:localhost:4445,server=on,wait=off -M virt-9.2,nvdimm=on,gic-version=3,ras=on -cpu max -smp 4 -numa node,nodeid=0,cpus=0-3,memdev=mem0 -append 'earlycon nomodeset root=/dev/vda1 fsck.mode=skip tp_printk maxcpus=4'
> 
> ---
> 
> v3: did some minor cleanups at the code, as suggested by Jonathan Cameron.
> 
> v2:
>   - some whitespace and comment changes
>   - patch 3/6 (acpi/ghes: rename the function which gets hw error offsets)
>     was merged on the cleanup series.
> 
> Mauro Carvalho Chehab (5):
>   acpi/ghes: Prepare to support multiple sources on ghes
>   acpi/ghes: add a firmware file with HEST address
>   acpi/ghes: Use HEST table offsets when preparing GHES records
>   acpi/generic_event_device: Update GHES migration to cover hest addr
>   acpi/generic_event_device: add logic to detect if HEST addr is
>     available
> 
>  hw/acpi/generic_event_device.c |  30 +++++++
>  hw/acpi/ghes.c                 | 160 +++++++++++++++++++++++++++++----
>  hw/arm/virt-acpi-build.c       |  33 ++++++-
>  hw/core/machine.c              |   2 +
>  include/hw/acpi/ghes.h         |  23 +++--
>  5 files changed, 220 insertions(+), 28 deletions(-)
> 
> -- 
> 2.47.1
> 

Re: [PATCH v3 0/5] Change ghes driver to use HEST-based offsets

[Mauro Carvalho Chehab]

Em Wed, 8 Jan 2025 09:08:51 -0500
"Michael S. Tsirkin" <mst@redhat.com> escreveu:

> On Wed, Dec 04, 2024 at 04:57:54PM +0100, Mauro Carvalho Chehab wrote:
> > This  series was part of the previous PR to add generic error injection
> > support on GHES. It depends on a cleanup patch series sent earlier
> > today:
> > 
> >     https://lore.kernel.org/qemu-devel/cover.1733297707.git.mchehab+huawei@kernel.org/T/#t
> > 
> > It contains the changes of the math used to calculate offsets at HEST table 
> > and hardware_error firmware file. It prepares for the addition of GHES
> > error injection.
> > 
> > The first patch was previously at the cleanup series. It prepares
> > the logic to support multiple sources.
> > 
> > The second patch adds a new firmware file to store HEST address.
> > 
> > The third patch use the new firmware to calculate offsets using
> > HEST table.
> > 
> > Patches 4 and 5 add migration support. They assume that this
> > series will be merged for qemu 9.2 (maybe it is too late for that,
> > as QEMU is now on soft freeze). 
> > 
> > I tested migration using both virt-9.1 and virt-9.2 machines
> > on qemu 9.2.  
> 
> So this needs a rebase to the next release. Thanks!

Sure, I'll do the rebase today.

What about the preparation patch series, from where this one is
placed on the top:

	https://lore.kernel.org/qemu-devel/cover.1733297707.git.mchehab+huawei@kernel.org/T/#m3b56bbe7bd400369f9e38b56faf4e65e64069955

Could you merge it? It should apply cleanly on

	https://gitlab.com/qemu-project/qemu.git master

and it doesn't contain any migration stuff on it.

Thanks,
Mauro