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block: m25p80: Support read only bdrvs. 

By just never doing write-backs. This is completely invisible to the
guest, as the entire storage area is implemented as device state (at
realize time the entire drive is read in).

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
master
Peter Crosthwaite 2014-06-18 18:36:37 -07:00 committed by Stefan Hajnoczi
parent fc1084aad7
commit 999e5aa5ce
1 changed files with 2 additions and 6 deletions
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8
hw/block/m25p80.c
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@ -291,7 +291,7 @@ static void flash_sync_page(Flash *s, int page)
int bdrv_sector, nb_sectors;
QEMUIOVector iov;
if (!s->bdrv) {
if (!s->bdrv || bdrv_is_read_only(s->bdrv)) {
return;
}
@ -309,7 +309,7 @@ static inline void flash_sync_area(Flash *s, int64_t off, int64_t len)
int64_t start, end, nb_sectors;
QEMUIOVector iov;
if (!s->bdrv) {
if (!s->bdrv || bdrv_is_read_only(s->bdrv)) {
return;
}
@ -627,10 +627,6 @@ static int m25p80_init(SSISlave *ss)
if (dinfo && dinfo->bdrv) {
DB_PRINT_L(0, "Binding to IF_MTD drive\n");
s->bdrv = dinfo->bdrv;
if (bdrv_is_read_only(s->bdrv)) {
fprintf(stderr, "Can't use a read-only drive");
return 1;
}
/* FIXME: Move to late init */
if (bdrv_read(s->bdrv, 0, s->storage, DIV_ROUND_UP(s->size,