[PULL v2 20/24] ACPI ERST: create ACPI ERST table for pc/x86 machines

[Michael S. Tsirkin]

From: Eric DeVolder <eric.devolder@oracle.com>

This change exposes ACPI ERST support for x86 guests.

Signed-off-by: Eric DeVolder <eric.devolder@oracle.com>
Reviewed-by: Ani Sinha <ani@anisinha.ca>
Message-Id: <1643402289-22216-8-git-send-email-eric.devolder@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 include/hw/acpi/erst.h |  5 +++++
 hw/i386/acpi-build.c   | 15 +++++++++++++++
 hw/i386/acpi-microvm.c | 15 +++++++++++++++
 3 files changed, 35 insertions(+)

diff --git a/include/hw/acpi/erst.h b/include/hw/acpi/erst.h
index 9d637179fe..b747fe7739 100644
--- a/include/hw/acpi/erst.h
+++ b/include/hw/acpi/erst.h
@@ -16,4 +16,9 @@ void build_erst(GArray *table_data, BIOSLinker *linker, 
Object *erst_dev,
 
 #define TYPE_ACPI_ERST "acpi-erst"
 
+/* returns NULL unless there is exactly one device */
+static inline Object *find_erst_dev(void)
+{
+    return object_resolve_path_type("", TYPE_ACPI_ERST, NULL);
+}
 #endif
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index ce823e8fcb..ebd47aa26f 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -43,6 +43,7 @@
 #include "sysemu/tpm.h"
 #include "hw/acpi/tpm.h"
 #include "hw/acpi/vmgenid.h"
+#include "hw/acpi/erst.h"
 #include "sysemu/tpm_backend.h"
 #include "hw/rtc/mc146818rtc_regs.h"
 #include "migration/vmstate.h"
@@ -74,6 +75,8 @@
 #include "hw/acpi/hmat.h"
 #include "hw/acpi/viot.h"
 
+#include CONFIG_DEVICES
+
 /* These are used to size the ACPI tables for -M pc-i440fx-1.7 and
  * -M pc-i440fx-2.0.  Even if the actual amount of AML generated grows
  * a little bit, there should be plenty of free space since the DSDT
@@ -2575,6 +2578,18 @@ void acpi_build(AcpiBuildTables *tables, MachineState 
*machine)
                     ACPI_DEVICE_IF(x86ms->acpi_dev), x86ms->oem_id,
                     x86ms->oem_table_id);
 
+#ifdef CONFIG_ACPI_ERST
+    {
+        Object *erst_dev;
+        erst_dev = find_erst_dev();
+        if (erst_dev) {
+            acpi_add_table(table_offsets, tables_blob);
+            build_erst(tables_blob, tables->linker, erst_dev,
+                       x86ms->oem_id, x86ms->oem_table_id);
+        }
+    }
+#endif
+
     vmgenid_dev = find_vmgenid_dev();
     if (vmgenid_dev) {
         acpi_add_table(table_offsets, tables_blob);
diff --git a/hw/i386/acpi-microvm.c b/hw/i386/acpi-microvm.c
index 196d318499..68ca7e7fc2 100644
--- a/hw/i386/acpi-microvm.c
+++ b/hw/i386/acpi-microvm.c
@@ -30,6 +30,7 @@
 #include "hw/acpi/bios-linker-loader.h"
 #include "hw/acpi/generic_event_device.h"
 #include "hw/acpi/utils.h"
+#include "hw/acpi/erst.h"
 #include "hw/i386/fw_cfg.h"
 #include "hw/i386/microvm.h"
 #include "hw/pci/pci.h"
@@ -40,6 +41,8 @@
 #include "acpi-common.h"
 #include "acpi-microvm.h"
 
+#include CONFIG_DEVICES
+
 static void acpi_dsdt_add_virtio(Aml *scope,
                                  MicrovmMachineState *mms)
 {
@@ -207,6 +210,18 @@ static void acpi_build_microvm(AcpiBuildTables *tables,
                     ACPI_DEVICE_IF(x86ms->acpi_dev), x86ms->oem_id,
                     x86ms->oem_table_id);
 
+#ifdef CONFIG_ACPI_ERST
+    {
+        Object *erst_dev;
+        erst_dev = find_erst_dev();
+        if (erst_dev) {
+            acpi_add_table(table_offsets, tables_blob);
+            build_erst(tables_blob, tables->linker, erst_dev,
+                       x86ms->oem_id, x86ms->oem_table_id);
+        }
+    }
+#endif
+
     xsdt = tables_blob->len;
     build_xsdt(tables_blob, tables->linker, table_offsets, x86ms->oem_id,
                x86ms->oem_table_id);
-- 
MST