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89 lines
3.0 KiB
89 lines
3.0 KiB
9 months ago
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From cd08d22a0da022d99fe6cfddb7de680abf66c8be Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Tue, 5 Dec 2023 13:19:59 -0500
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Subject: [PATCH 082/101] scsi: assert that callbacks run in the correct
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AioContext
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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RH-MergeRequest: 214: Remove AioContext lock
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RH-Jira: RHEL-15965
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Commit: [13/26] d2fd5065c3b72d9d2f4e37efee39fe12eba0f0a9 (kmwolf/centos-qemu-kvm)
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Since the removal of AioContext locking, the correctness of the code
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relies on running requests from a single AioContext at any given time.
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Add assertions that verify that callbacks are invoked in the correct
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AioContext.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Message-ID: <20231205182011.1976568-3-stefanha@redhat.com>
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Reviewed-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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---
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hw/scsi/scsi-disk.c | 14 ++++++++++++++
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system/dma-helpers.c | 3 +++
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2 files changed, 17 insertions(+)
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diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
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index 2c1bbb3530..a5048e0aaf 100644
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--- a/hw/scsi/scsi-disk.c
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+++ b/hw/scsi/scsi-disk.c
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@@ -273,6 +273,10 @@ static void scsi_aio_complete(void *opaque, int ret)
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SCSIDiskReq *r = (SCSIDiskReq *)opaque;
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SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
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+ /* The request must only run in the BlockBackend's AioContext */
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+ assert(blk_get_aio_context(s->qdev.conf.blk) ==
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+ qemu_get_current_aio_context());
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+
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assert(r->req.aiocb != NULL);
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r->req.aiocb = NULL;
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@@ -370,8 +374,13 @@ static void scsi_dma_complete(void *opaque, int ret)
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static void scsi_read_complete_noio(SCSIDiskReq *r, int ret)
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{
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+ SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
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uint32_t n;
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+ /* The request must only run in the BlockBackend's AioContext */
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+ assert(blk_get_aio_context(s->qdev.conf.blk) ==
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+ qemu_get_current_aio_context());
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+
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assert(r->req.aiocb == NULL);
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if (scsi_disk_req_check_error(r, ret, false)) {
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goto done;
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@@ -496,8 +505,13 @@ static void scsi_read_data(SCSIRequest *req)
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static void scsi_write_complete_noio(SCSIDiskReq *r, int ret)
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{
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+ SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
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uint32_t n;
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+ /* The request must only run in the BlockBackend's AioContext */
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+ assert(blk_get_aio_context(s->qdev.conf.blk) ==
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+ qemu_get_current_aio_context());
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+
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assert (r->req.aiocb == NULL);
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if (scsi_disk_req_check_error(r, ret, false)) {
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goto done;
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diff --git a/system/dma-helpers.c b/system/dma-helpers.c
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index 528117f256..9b221cf94e 100644
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--- a/system/dma-helpers.c
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+++ b/system/dma-helpers.c
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@@ -119,6 +119,9 @@ static void dma_blk_cb(void *opaque, int ret)
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trace_dma_blk_cb(dbs, ret);
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+ /* DMAAIOCB is not thread-safe and must be accessed only from dbs->ctx */
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+ assert(ctx == qemu_get_current_aio_context());
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+
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dbs->acb = NULL;
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dbs->offset += dbs->iov.size;
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--
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2.39.3
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