[PATCH v6 07/10] ACPI ERST: create ACPI ERST table for pc/x86 machines

[Eric DeVolder <eric.devolder@oracle.com>]

This change exposes ACPI ERST support for x86 guests.

Signed-off-by: Eric DeVolder <eric.devolder@oracle.com>
---
 hw/i386/acpi-build.c   | 9 +++++++++
 hw/i386/acpi-microvm.c | 9 +++++++++
 include/hw/acpi/erst.h | 5 +++++
 3 files changed, 23 insertions(+)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index a33ac8b..b55a548 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"
@@ -2443,6 +2444,7 @@ void acpi_build(AcpiBuildTables *tables, MachineState *machine)
     GArray *tables_blob = tables->table_data;
     AcpiSlicOem slic_oem = { .id = NULL, .table_id = NULL };
     Object *vmgenid_dev;
+    Object *erst_dev;
     char *oem_id;
     char *oem_table_id;
 
@@ -2504,6 +2506,13 @@ void acpi_build(AcpiBuildTables *tables, MachineState *machine)
                     ACPI_DEVICE_IF(x86ms->acpi_dev), x86ms->oem_id,
                     x86ms->oem_table_id);
 
+    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);
+    }
+
     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 1a0f77b..6578254 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"
@@ -159,6 +160,7 @@ static void acpi_build_microvm(AcpiBuildTables *tables,
     X86MachineState *x86ms = X86_MACHINE(mms);
     GArray *table_offsets;
     GArray *tables_blob = tables->table_data;
+    Object *erst_dev;
     unsigned dsdt, xsdt;
     AcpiFadtData pmfadt = {
         /* ACPI 5.0: 4.1 Hardware-Reduced ACPI */
@@ -208,6 +210,13 @@ static void acpi_build_microvm(AcpiBuildTables *tables,
                     ACPI_DEVICE_IF(x86ms->acpi_dev), x86ms->oem_id,
                     x86ms->oem_table_id);
 
+    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);
+    }
+
     xsdt = tables_blob->len;
     build_xsdt(tables_blob, tables->linker, table_offsets, x86ms->oem_id,
                x86ms->oem_table_id);
diff --git a/include/hw/acpi/erst.h b/include/hw/acpi/erst.h
index 9d63717..b747fe7 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
-- 
1.8.3.1