vhost-user-scmi: add inter vm sram

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

2 files changed, 48 insertions, 0 deletions

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index d2e5ecd234..52f64645bb 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -154,6 +154,7 @@ static const MemMapEntry base_memmap[] = {
     [VIRT_NVDIMM_ACPI] =        { 0x09090000, NVDIMM_ACPI_IO_LEN},
     [VIRT_PVTIME] =             { 0x090a0000, 0x00010000 },
     [VIRT_SECURE_GPIO] =        { 0x090b0000, 0x00001000 },
+    [VIRT_SRAM] =               { 0x090c0000, 0x00001000 },
     [VIRT_MMIO] =               { 0x0a000000, 0x00000200 },
     /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size */
     [VIRT_PLATFORM_BUS] =       { 0x0c000000, 0x02000000 },
@@ -861,6 +862,50 @@ static void create_uart(const VirtMachineState *vms, int uart,
     g_free(nodename);
 }
 
+static void create_inter_vm_sram(VirtMachineState *vms,
+                              MemoryRegion *mem)
+{
+    MemoryRegion *sram;
+    char *nodename;
+    const char regionname[] = "virt_sram";
+    hwaddr base = vms->memmap[VIRT_SRAM].base;
+    hwaddr size = vms->memmap[VIRT_SRAM].size;
+    MachineState *ms = MACHINE(vms);
+    Object *backend;
+    ram_addr_t backend_size;
+    HostMemoryBackend *HostBackend;
+
+    backend = object_resolve_path_type(regionname, TYPE_MEMORY_BACKEND, NULL);
+    if (!backend) {
+        /* No memory-backend-file has been added for the region */
+        warn_report("Memory backend for '%s' not found", regionname);
+        sram = g_new(MemoryRegion, 1);
+        memory_region_init_ram(sram, NULL, regionname, size, &error_fatal);
+    } else {
+	backend_size = object_property_get_uint(backend, "size",  &error_abort);
+	if (backend_size != size)
+		warn_report("Size specified by %s: %ld should match size of "
+                     "explicitly specified 'memory-backend' property %ld", regionname, size, backend_size);
+
+	/* Get memory region of the Hostbackend */
+        HostBackend = MEMORY_BACKEND(backend);
+        sram = host_memory_backend_get_memory(HostBackend);
+        host_memory_backend_set_mapped(HostBackend, true);
+   }
+
+    memory_region_add_subregion(mem, base, sram);
+
+    /* Add device in DT*/
+    nodename = g_strdup_printf("/vmram@%" PRIx64, base);
+    qemu_fdt_add_subnode(ms->fdt, nodename);
+    qemu_fdt_setprop_string(ms->fdt, nodename, "device_type", "memory");
+    qemu_fdt_setprop_sized_cells(ms->fdt, nodename, "reg", 2, base, 2, size);
+    qemu_fdt_setprop_string(ms->fdt, nodename, "status", "okay");
+
+    g_free(nodename);
+}
+
+
 static void create_rtc(const VirtMachineState *vms)
 {
     char *nodename;
@@ -2196,6 +2241,8 @@ static void machvirt_init(MachineState *machine)
 
     vms->highmem_ecam &= (!firmware_loaded || aarch64);
 
+    create_inter_vm_sram(vms, sysmem);
+
     create_rtc(vms);
 
     create_pcie(vms);
diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
index 7e76ee2619..c2757bae18 100644
--- a/include/hw/arm/virt.h
+++ b/include/hw/arm/virt.h
@@ -86,6 +86,7 @@ enum {
     VIRT_ACPI_GED,
     VIRT_NVDIMM_ACPI,
     VIRT_PVTIME,
+    VIRT_SRAM,
     VIRT_LOWMEMMAP_LAST,
 };