haraldwolff/qemu-patch-raspberry4
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

s390x: initialize virtio dev region

Browse source 
When running the s390x virtio machine we can potentially use uninitialized
memory for the virtio device backing ram. That can lead to weird breakge.

So let's better initialize it to 0 properly.

Reported-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

---

v1 -> v2:

  - use target_phys_addr_t
This commit is contained in:
Alexander Graf 2011-11-10 01:59:23 +01:00
parent 2a534aff30
commit 326384d5b6
1 changed files with 12 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
hw/s390-virtio.c
View file

@ -165,6 +165,9 @@ static void s390_init(ram_addr_t my_ram_size,
ram_addr_t initrd_size = 0;
int shift = 0;
uint8_t *storage_keys;
void *virtio_region;
target_phys_addr_t virtio_region_len;
target_phys_addr_t virtio_region_start;
int i;
/* s390x ram size detection needs a 16bit multiplier + an increment. So
@ -184,6 +187,15 @@ static void s390_init(ram_addr_t my_ram_size,
memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size);
memory_region_add_subregion(sysmem, 0, ram);
/* clear virtio region */
virtio_region_len = my_ram_size - ram_size;
virtio_region_start = ram_size;
virtio_region = cpu_physical_memory_map(virtio_region_start,
&virtio_region_len, true);
memset(virtio_region, 0, virtio_region_len);
cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
virtio_region_len);
/* allocate storage keys */
storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);