[PATCH] hw/riscv: virt: Remove size restriction for pflash

[Sunil V L]

The pflash implementation currently assumes fixed size of the
backend storage. Due to this, the backend storage file needs to be
exactly of size 32M. Otherwise, there will be an error like below.

"device requires 33554432 bytes, block backend provides 3145728 bytes"

Fix this issue by using the actual size of the backing store.

Signed-off-by: Sunil V L <suni...@ventanamicro.com>
---
 hw/riscv/virt.c | 33 +++++++++++++++++++++++++--------
 1 file changed, 25 insertions(+), 8 deletions(-)

diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index a5bc7353b4..aad175fa31 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -49,6 +49,7 @@
 #include "hw/pci/pci.h"
 #include "hw/pci-host/gpex.h"
 #include "hw/display/ramfb.h"
+#include "sysemu/block-backend.h"
 
 /*
  * The virt machine physical address space used by some of the devices
@@ -144,10 +145,17 @@ static void virt_flash_map1(PFlashCFI01 *flash,
                             MemoryRegion *sysmem)
 {
     DeviceState *dev = DEVICE(flash);
+    BlockBackend *blk;
+    hwaddr real_size;
 
-    assert(QEMU_IS_ALIGNED(size, VIRT_FLASH_SECTOR_SIZE));
-    assert(size / VIRT_FLASH_SECTOR_SIZE <= UINT32_MAX);
-    qdev_prop_set_uint32(dev, "num-blocks", size / VIRT_FLASH_SECTOR_SIZE);
+    blk = pflash_cfi01_get_blk(flash);
+
+    real_size = blk ? blk_getlength(blk): size;
+
+    assert(real_size);
+    assert(QEMU_IS_ALIGNED(real_size, VIRT_FLASH_SECTOR_SIZE));
+    assert(real_size / VIRT_FLASH_SECTOR_SIZE <= UINT32_MAX);
+    qdev_prop_set_uint32(dev, "num-blocks", real_size / 
VIRT_FLASH_SECTOR_SIZE);
     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
 
     memory_region_add_subregion(sysmem, base,
@@ -971,15 +979,24 @@ static void create_fdt_flash(RISCVVirtState *s, const 
MemMapEntry *memmap)
 {
     char *name;
     MachineState *mc = MACHINE(s);
-    hwaddr flashsize = virt_memmap[VIRT_FLASH].size / 2;
-    hwaddr flashbase = virt_memmap[VIRT_FLASH].base;
+    MemoryRegion *flash_mem;
+    hwaddr flashsize[2];
+    hwaddr flashbase[2];
+
+    flash_mem = pflash_cfi01_get_memory(s->flash[0]);
+    flashbase[0] = flash_mem->addr;
+    flashsize[0] = flash_mem->size;
+
+    flash_mem = pflash_cfi01_get_memory(s->flash[1]);
+    flashbase[1] = flash_mem->addr;
+    flashsize[1] = flash_mem->size;
 
-    name = g_strdup_printf("/flash@%" PRIx64, flashbase);
+    name = g_strdup_printf("/flash@%" PRIx64, flashbase[0]);
     qemu_fdt_add_subnode(mc->fdt, name);
     qemu_fdt_setprop_string(mc->fdt, name, "compatible", "cfi-flash");
     qemu_fdt_setprop_sized_cells(mc->fdt, name, "reg",
-                                 2, flashbase, 2, flashsize,
-                                 2, flashbase + flashsize, 2, flashsize);
+                                 2, flashbase[0], 2, flashsize[0],
+                                 2, flashbase[1], 2, flashsize[1]);
     qemu_fdt_setprop_cell(mc->fdt, name, "bank-width", 4);
     g_free(name);
 }
-- 
2.38.0