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nvdimm acpi: emulate dsm method 

Emulate dsm method after IO VM-exit

Currently, we only introduce the framework and no function is actually
supported

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>
This commit is contained in:
Xiao Guangrong 2016-03-05 00:00:35 +08:00 committed by Michael S. Tsirkin
parent 18c440e1e1
commit f7df22de56
2 changed files with 64 additions and 0 deletions
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56
hw/acpi/nvdimm.c
View File

@ -390,15 +390,71 @@ struct NvdimmDsmOut {
} QEMU_PACKED;
typedef struct NvdimmDsmOut NvdimmDsmOut;
struct NvdimmDsmFunc0Out {
/* the size of buffer filled by QEMU. */
uint32_t len;
uint32_t supported_func;
} QEMU_PACKED;
typedef struct NvdimmDsmFunc0Out NvdimmDsmFunc0Out;
struct NvdimmDsmFuncNoPayloadOut {
/* the size of buffer filled by QEMU. */
uint32_t len;
uint32_t func_ret_status;
} QEMU_PACKED;
typedef struct NvdimmDsmFuncNoPayloadOut NvdimmDsmFuncNoPayloadOut;
static uint64_t
nvdimm_dsm_read(void *opaque, hwaddr addr, unsigned size)
{
nvdimm_debug("BUG: we never read _DSM IO Port.\n");
return 0;
}
static void
nvdimm_dsm_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)
{
NvdimmDsmIn *in;
hwaddr dsm_mem_addr = val;
nvdimm_debug("dsm memory address %#" HWADDR_PRIx ".\n", dsm_mem_addr);
/*
* The DSM memory is mapped to guest address space so an evil guest
* can change its content while we are doing DSM emulation. Avoid
* this by copying DSM memory to QEMU local memory.
*/
in = g_malloc(TARGET_PAGE_SIZE);
cpu_physical_memory_read(dsm_mem_addr, in, TARGET_PAGE_SIZE);
le32_to_cpus(&in->revision);
le32_to_cpus(&in->function);
le32_to_cpus(&in->handle);
nvdimm_debug("Revision %#x Handler %#x Function %#x.\n", in->revision,
in->handle, in->function);
/*
* function 0 is called to inquire which functions are supported by
* OSPM
*/
if (in->function == 0) {
NvdimmDsmFunc0Out func0 = {
.len = cpu_to_le32(sizeof(func0)),
/* No function supported other than function 0 */
.supported_func = cpu_to_le32(0),
};
cpu_physical_memory_write(dsm_mem_addr, &func0, sizeof func0);
} else {
/* No function except function 0 is supported yet. */
NvdimmDsmFuncNoPayloadOut out = {
.len = cpu_to_le32(sizeof(out)),
.func_ret_status = cpu_to_le32(1) /* Not Supported */,
};
cpu_physical_memory_write(dsm_mem_addr, &out, sizeof(out));
}
g_free(in);
}
static const MemoryRegionOps nvdimm_dsm_ops = {

8
include/hw/mem/nvdimm.h
View File

@ -25,6 +25,14 @@
#include "hw/mem/pc-dimm.h"
#define NVDIMM_DEBUG 0
#define nvdimm_debug(fmt, ...) \
do { \
if (NVDIMM_DEBUG) { \
fprintf(stderr, "nvdimm: " fmt, ## __VA_ARGS__); \
} \
} while (0)
#define TYPE_NVDIMM "nvdimm"
#define NVDIMM_DSM_MEM_FILE "etc/acpi/nvdimm-mem"