Patchwork [02/16] virtio-scsi: prepare migration format for multiqueue

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Submitter Paolo Bonzini
Date April 19, 2012, 2:29 p.m.
Message ID <1334845776-11664-3-git-send-email-pbonzini@redhat.com>
Download mbox | patch
Permalink /patch/153787/
State New
Headers show

Comments

Paolo Bonzini - April 19, 2012, 2:29 p.m.
In order to restore requests correctly from a multitude of virtqueues,
we need to store the id of the request queue that each request came
from.

Do this even for single-queue, by storing a hard-coded zero, to
simplify future implementation of multiqueue.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/virtio-scsi.c |    5 +++++
 1 file changed, 5 insertions(+)

Patch

diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c
index 45d54fa..0d90d9c 100644
--- a/hw/virtio-scsi.c
+++ b/hw/virtio-scsi.c
@@ -240,7 +240,9 @@  static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq)
 static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq)
 {
     VirtIOSCSIReq *req = sreq->hba_private;
+    uint32_t n = 0;
 
+    qemu_put_be32s(f, &n);
     qemu_put_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem));
 }
 
@@ -249,8 +251,11 @@  static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq)
     SCSIBus *bus = sreq->bus;
     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
     VirtIOSCSIReq *req;
+    uint32_t n;
 
     req = g_malloc(sizeof(*req));
+    qemu_get_be32s(f, &n);
+    assert(n == 0);
     qemu_get_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem));
     virtio_scsi_parse_req(s, s->cmd_vq, req);