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authorDr. David Alan Gilbert <dgilbert@redhat.com>2016-04-15 12:41:30 +0100
committerKevin Wolf <kwolf@redhat.com>2016-04-15 17:27:34 +0200
commit90c647db8d59e47c9000affc0d81754eb346e939 (patch)
treecf91e4494449229974a9feede8a3f5ff17518c4e /hw/block/pflash_cfi01.c
parent16aaf975eeed92cce602a844f795a027182a6861 (diff)
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>
Diffstat (limited to 'hw/block/pflash_cfi01.c')
-rw-r--r--hw/block/pflash_cfi01.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/hw/block/pflash_cfi01.c b/hw/block/pflash_cfi01.c
index c475c2aea7..106a775232 100644
--- a/hw/block/pflash_cfi01.c
+++ b/hw/block/pflash_cfi01.c
@@ -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;
}