[Qemu-devel] [PULL v2 23/51] nvdimm acpi: introduce patched dsm memory

["Michael S. Tsirkin" <mst@redhat.com>]

From: Xiao Guangrong <guangrong.xiao@linux.intel.com>

The dsm memory is used to save the input parameters and store
the dsm result which is filled by QEMU.

The address of dsm memory is decided by bios and patched into
int32 object named "MEMA"

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/acpi/nvdimm.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c
index 8568b20..90032e5 100644
--- a/hw/acpi/nvdimm.c
+++ b/hw/acpi/nvdimm.c
@@ -29,6 +29,7 @@
 #include "qemu/osdep.h"
 #include "hw/acpi/acpi.h"
 #include "hw/acpi/aml-build.h"
+#include "hw/acpi/bios-linker-loader.h"
 #include "hw/nvram/fw_cfg.h"
 #include "hw/mem/nvdimm.h"
 
@@ -406,6 +407,7 @@ void nvdimm_init_acpi_state(AcpiNVDIMMState *state, MemoryRegion *io,
 }
 
 #define NVDIMM_COMMON_DSM      "NCAL"
+#define NVDIMM_ACPI_MEM_ADDR   "MEMA"
 
 static void nvdimm_build_common_dsm(Aml *dev)
 {
@@ -471,6 +473,7 @@ static void nvdimm_build_ssdt(GSList *device_list, GArray *table_offsets,
                               GArray *table_data, GArray *linker)
 {
     Aml *ssdt, *sb_scope, *dev;
+    int mem_addr_offset, nvdimm_ssdt;
 
     acpi_add_table(table_offsets, table_data);
 
@@ -500,13 +503,24 @@ static void nvdimm_build_ssdt(GSList *device_list, GArray *table_offsets,
     nvdimm_build_nvdimm_devices(device_list, dev);
 
     aml_append(sb_scope, dev);
-
     aml_append(ssdt, sb_scope);
+
+    nvdimm_ssdt = table_data->len;
+
     /* copy AML table into ACPI tables blob and patch header there */
     g_array_append_vals(table_data, ssdt->buf->data, ssdt->buf->len);
+    mem_addr_offset = build_append_named_dword(table_data,
+                                               NVDIMM_ACPI_MEM_ADDR);
+
+    bios_linker_loader_alloc(linker, NVDIMM_DSM_MEM_FILE, TARGET_PAGE_SIZE,
+                             false /* high memory */);
+    bios_linker_loader_add_pointer(linker, ACPI_BUILD_TABLE_FILE,
+                                   NVDIMM_DSM_MEM_FILE, table_data,
+                                   table_data->data + mem_addr_offset,
+                                   sizeof(uint32_t));
     build_header(linker, table_data,
-        (void *)(table_data->data + table_data->len - ssdt->buf->len),
-        "SSDT", ssdt->buf->len, 1, NULL, "NVDIMM");
+        (void *)(table_data->data + nvdimm_ssdt),
+        "SSDT", table_data->len - nvdimm_ssdt, 1, NULL, "NVDIMM");
     free_aml_allocator();
 }
 
-- 
MST