[PATCH v4 02/14] acpi/ghes: add a firmware file with HEST address

[Mauro Carvalho Chehab]

Store HEST table address at GPA, placing its the start of the table at
hest_addr_le variable.

Signed-off-by: Mauro Carvalho Chehab <mchehab+hua...@kernel.org>
Reviewed-by: Jonathan Cameron <jonathan.came...@huawei.com>
Reviewed-by: Igor Mammedov <imamm...@redhat.com>
---
 hw/acpi/ghes.c         | 22 ++++++++++++++++++++--
 include/hw/acpi/ghes.h |  7 ++++++-
 2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
index e49a03fdb94e..ba37be9e7022 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)
@@ -341,6 +342,9 @@ void acpi_build_hest(AcpiGhesState *ags, GArray *table_data,
 {
     AcpiTable table = { .sig = "HEST", .rev = 1,
                         .oem_id = oem_id, .oem_table_id = oem_table_id };
+    uint32_t hest_offset;
+
+    hest_offset = table_data->len;
 
     build_ghes_error_table(ags, hardware_errors, linker);
 
@@ -352,6 +356,17 @@ void acpi_build_hest(AcpiGhesState *ags, GArray 
*table_data,
                   ACPI_GHES_NOTIFY_SEA, ACPI_HEST_SRC_ID_SEA);
 
     acpi_table_end(linker, &table);
+
+    if (ags->use_hest_addr) {
+        /*
+         * 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,
@@ -361,7 +376,10 @@ void acpi_ghes_add_fw_cfg(AcpiGhesState *ags, FWCfgState 
*s,
     fw_cfg_add_file(s, ACPI_HW_ERROR_FW_CFG_FILE, hardware_error->data,
                     hardware_error->len);
 
-    if (!ags->use_hest_addr) {
+    if (ags->use_hest_addr) {
+        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);
+    } else {
         /* Create a read-write fw_cfg file for Address */
         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);
@@ -501,7 +519,7 @@ bool acpi_ghes_present(void)
         return false;
     }
     ags = &acpi_ged_state->ghes_state;
-    if (!ags->hw_error_le)
+    if (!ags->hw_error_le && !ags->hest_addr_le)
         return false;
 
     return true;
diff --git a/include/hw/acpi/ghes.h b/include/hw/acpi/ghes.h
index a3d62b96584f..454e97b5341c 100644
--- a/include/hw/acpi/ghes.h
+++ b/include/hw/acpi/ghes.h
@@ -71,9 +71,14 @@ enum {
  * meaning an offset from the etc/hardware_errors firmware address. This
  * is the default on QEMU 9.x.
  *
- * An offset value equal to zero means that GHES is not present.
+ * When use_hest_addr is true, the stored offset is placed at hest_addr_le,
+ * meaning an offset from theHEST table address from etc/acpi/tables firmware.
+ * This is the default for QEMU 10.x and above.
+ *
+ * If both offset values are equal to zero, it means that GHES is not present.
  */
 typedef struct AcpiGhesState {
+    uint64_t hest_addr_le;
     uint64_t hw_error_le;
     bool use_hest_addr;         /* Currently, always false */
 } AcpiGhesState;
-- 
2.48.1