On Wed, Mar 02, 2016 at 07:50:40PM +0800, Xiao Guangrong wrote:
> 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@xxxxxxxxxxxxxxx>
> ---
> hw/acpi/nvdimm.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++
> include/hw/mem/nvdimm.h | 8 +++++++
> 2 files changed, 64 insertions(+)
>
> diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c
> index 781f6c1..5a17ee2 100644
> --- a/hw/acpi/nvdimm.c
> +++ b/hw/acpi/nvdimm.c
> @@ -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 %#lx.\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 what functions
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 = {
> diff --git a/include/hw/mem/nvdimm.h b/include/hw/mem/nvdimm.h
> index 634c60b..aaa2608 100644
> --- a/include/hw/mem/nvdimm.h
> +++ b/include/hw/mem/nvdimm.h
> @@ -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"
> --
> 1.8.3.1
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