scsi-disk: support toggling the write cache
Finally, this uses the "plumbing" in the previous patch to
add support for toggling the WCE bit of the caching mode page.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index ad6c00d..fd5cd70 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -1050,10 +1050,8 @@
case MODE_PAGE_CACHING:
length = 0x12;
- if (page_control == 1) { /* Changeable Values */
- break;
- }
- if (bdrv_enable_write_cache(s->qdev.conf.bs)) {
+ if (page_control == 1 || /* Changeable Values */
+ bdrv_enable_write_cache(s->qdev.conf.bs)) {
p[0] = 4; /* WCE */
}
break;
@@ -1325,6 +1323,14 @@
static void scsi_disk_apply_mode_select(SCSIDiskState *s, int page, uint8_t *p)
{
+ switch (page) {
+ case MODE_PAGE_CACHING:
+ bdrv_set_enable_write_cache(s->qdev.conf.bs, (p[0] & 4) != 0);
+ break;
+
+ default:
+ break;
+ }
}
static int mode_select_pages(SCSIDiskReq *r, uint8_t *p, int len, bool change)
