Emulate dsm method after IO VM-exit
Currently, we only introduce the framework and no function is actually
supported
Signed-off-by: Xiao Guangrong <address@hidden>
---
hw/acpi/aml-build.c | 2 +-
hw/acpi/nvdimm.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
include/hw/acpi/aml-build.h | 1 +
include/hw/mem/nvdimm.h | 8 ++++++++
4 files changed, 54 insertions(+), 1 deletion(-)
diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index ab89ca6..da11bf8 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -227,7 +227,7 @@ static void build_extop_package(GArray *package, uint8_t op)
build_prepend_byte(package, 0x5B); /* ExtOpPrefix */
}
-static void build_append_int_noprefix(GArray *table, uint64_t value, int size)
+void build_append_int_noprefix(GArray *table, uint64_t value, int size)
{
int i;
diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c
index 781f6c1..e0b483a 100644
--- a/hw/acpi/nvdimm.c
+++ b/hw/acpi/nvdimm.c
@@ -393,12 +393,56 @@ typedef struct NvdimmDsmOut NvdimmDsmOut;
static uint64_t
nvdimm_dsm_read(void *opaque, hwaddr addr, unsigned size)
{
+ fprintf(stderr, "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;
+ GArray *out;
+ uint32_t buf_size;
+ 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);
+
+ out = g_array_new(false, true /* clear */, 1);
+
+ /*
+ * function 0 is called to inquire what functions are supported by
+ * OSPM
+ */
+ if (in->function == 0) {
+ build_append_int_noprefix(out, 0 /* No function Supported */,
+ sizeof(uint8_t));
+ } else {
+ /* No function is supported yet. */
+ build_append_int_noprefix(out, 1 /* Not Supported */,
+ sizeof(uint8_t));
+ }
+
+ buf_size = cpu_to_le32(out->len);
+ cpu_physical_memory_write(dsm_mem_addr, &buf_size, sizeof(buf_size));
+ cpu_physical_memory_write(dsm_mem_addr + sizeof(buf_size), out->data,
+ out->len);