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block/export: Fix vhost-user-blk shutdown with requests in flight

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The vhost-user-blk export runs requests asynchronously in their own
coroutine. When the vhost connection goes away and we want to stop the
vhost-user server, we need to wait for these coroutines to stop before
we can unmap the shared memory. Otherwise, they would still access the
unmapped memory and crash.

This introduces a refcount to VuServer which is increased when spawning
a new request coroutine and decreased before the coroutine exits. The
memory is only unmapped when the refcount reaches zero.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20220125151435.48792-1-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2022-01-25 16:14:35 +01:00
parent c0829cb1fd
commit 520d8b40e8
3 changed files with 32 additions and 0 deletions
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5
include/qemu/vhost-user-server.h
View file

@ -42,6 +42,8 @@ typedef struct {
const VuDevIface *vu_iface;
/* Protected by ctx lock */
unsigned int refcount;
bool wait_idle;
VuDev vu_dev;
QIOChannel *ioc; /* The I/O channel with the client */
QIOChannelSocket *sioc; /* The underlying data channel with the client */
@ -59,6 +61,9 @@ bool vhost_user_server_start(VuServer *server,
void vhost_user_server_stop(VuServer *server);
void vhost_user_server_ref(VuServer *server);
void vhost_user_server_unref(VuServer *server);
void vhost_user_server_attach_aio_context(VuServer *server, AioContext *ctx);
void vhost_user_server_detach_aio_context(VuServer *server);