Commit 7eecba3778 for qemu.org
commit 7eecba37788f48d34c015954f1207cc7b52728f5
Author: Stefan Hajnoczi <stefanha@redhat.com>
Date: Tue Mar 11 21:26:06 2025 +0800
scsi: track per-SCSIRequest AioContext
Until now, a SCSIDevice's I/O requests have run in a single AioContext.
In order to support multiple IOThreads it will be necessary to move to
the concept of a per-SCSIRequest AioContext.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20250311132616.1049687-4-stefanha@redhat.com>
Tested-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
index 7d4546800f..846bbbf0ec 100644
--- a/hw/scsi/scsi-bus.c
+++ b/hw/scsi/scsi-bus.c
@@ -868,6 +868,7 @@ invalid_opcode:
}
}
+ req->ctx = qemu_get_current_aio_context();
req->cmd = cmd;
req->residual = req->cmd.xfer;
diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index f049a20275..7cf8c31b98 100644
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -328,9 +328,8 @@ static void scsi_aio_complete(void *opaque, int ret)
SCSIDiskReq *r = (SCSIDiskReq *)opaque;
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
- /* The request must only run in the BlockBackend's AioContext */
- assert(blk_get_aio_context(s->qdev.conf.blk) ==
- qemu_get_current_aio_context());
+ /* The request must run in its AioContext */
+ assert(r->req.ctx == qemu_get_current_aio_context());
assert(r->req.aiocb != NULL);
r->req.aiocb = NULL;
@@ -430,12 +429,10 @@ static void scsi_dma_complete(void *opaque, int ret)
static void scsi_read_complete_noio(SCSIDiskReq *r, int ret)
{
- SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
uint32_t n;
- /* The request must only run in the BlockBackend's AioContext */
- assert(blk_get_aio_context(s->qdev.conf.blk) ==
- qemu_get_current_aio_context());
+ /* The request must run in its AioContext */
+ assert(r->req.ctx == qemu_get_current_aio_context());
assert(r->req.aiocb == NULL);
if (scsi_disk_req_check_error(r, ret, ret > 0)) {
@@ -562,12 +559,10 @@ static void scsi_read_data(SCSIRequest *req)
static void scsi_write_complete_noio(SCSIDiskReq *r, int ret)
{
- SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
uint32_t n;
- /* The request must only run in the BlockBackend's AioContext */
- assert(blk_get_aio_context(s->qdev.conf.blk) ==
- qemu_get_current_aio_context());
+ /* The request must run in its AioContext */
+ assert(r->req.ctx == qemu_get_current_aio_context());
assert (r->req.aiocb == NULL);
if (scsi_disk_req_check_error(r, ret, ret > 0)) {
diff --git a/include/hw/scsi/scsi.h b/include/hw/scsi/scsi.h
index c3d5e17e38..ffc48203f9 100644
--- a/include/hw/scsi/scsi.h
+++ b/include/hw/scsi/scsi.h
@@ -24,6 +24,7 @@ struct SCSIRequest {
SCSIBus *bus;
SCSIDevice *dev;
const SCSIReqOps *ops;
+ AioContext *ctx;
uint32_t refcount;
uint32_t tag;
uint32_t lun;