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Fix pflash migration 

Pflash migration (e.g. q35 + EFI variable storage) fails
with the assert:

bdrv_co_do_pwritev: Assertion `!(bs->open_flags & 0x0800)' failed.

This avoids the problem by delaying the pflash update until after
the device loads complete.

Tested by:
  Migrating Q35/EFI vm.
  Changing efi variable content (with efiboot in the guest)
  md5sum'ing the variable file before migration and after.

This is a fix that Paolo posted in the message
  570244B3.4070105@redhat.com

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2016-04-15 12:41:30 +01:00 committed by Kevin Wolf
parent 16aaf975ee
commit 90c647db8d
1 changed files with 16 additions and 2 deletions
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18
hw/block/pflash_cfi01.c
View File

@ -46,6 +46,7 @@
#include "exec/address-spaces.h"
#include "qemu/host-utils.h"
#include "hw/sysbus.h"
#include "sysemu/sysemu.h"
#define PFLASH_BUG(fmt, ...) \
do { \
@ -97,6 +98,7 @@ struct pflash_t {
MemoryRegion mem;
char *name;
void *storage;
VMChangeStateEntry *vmstate;
};
static int pflash_post_load(void *opaque, int version_id);
@ -944,13 +946,25 @@ MemoryRegion *pflash_cfi01_get_memory(pflash_t *fl)
return &fl->mem;
}
static void postload_update_cb(void *opaque, int running, RunState state)
{
pflash_t *pfl = opaque;
/* This is called after bdrv_invalidate_cache_all. */
qemu_del_vm_change_state_handler(pfl->vmstate);
pfl->vmstate = NULL;
DPRINTF("%s: updating bdrv for %s\n", __func__, pfl->name);
pflash_update(pfl, 0, pfl->sector_len * pfl->nb_blocs);
}
static int pflash_post_load(void *opaque, int version_id)
{
pflash_t *pfl = opaque;
if (!pfl->ro) {
DPRINTF("%s: updating bdrv for %s\n", __func__, pfl->name);
pflash_update(pfl, 0, pfl->sector_len * pfl->nb_blocs);
pfl->vmstate = qemu_add_vm_change_state_handler(postload_update_cb,
pfl);
}
return 0;
}