Paul Durrant 32d0b7be68 xen-bus/block: explicitly assign event channels to an AioContext ... It is not safe to close an event channel from the QEMU main thread when that channel's poller is running in IOThread context. This patch adds a new xen_device_set_event_channel_context() function to explicitly assign the channel AioContext, and modifies xen_device_bind_event_channel() to initially assign the channel's poller to the QEMU main thread context. The code in xen-block's dataplane is then modified to assign the channel to IOThread context during xen_block_dataplane_start() and de-assign it during in xen_block_dataplane_stop(), such that the channel is always assigned back to main thread context before it is closed. aio_set_fd_handler() already deals with all the necessary synchronization when moving an fd between AioContext-s so no extra code is needed to manage this. Reported-by: Julien Grall <jgrall@amazon.com> Signed-off-by: Paul Durrant <pdurrant@amazon.com> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com> Message-Id: <20191216143451.19024-1-pdurrant@amazon.com> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>		2020-02-27 11:50:30 +00:00
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dataplane	xen-bus/block: explicitly assign event channels to an AioContext	2020-02-27 11:50:30 +00:00
block.c
cdrom.c
ecc.c
fdc.c
hd-geometry.c
Kconfig
m25p80.c
Makefile.objs
nand.c
nvme.c
nvme.h
onenand.c
pflash_cfi01.c
pflash_cfi02.c
swim.c
tc58128.c
trace-events
vhost-user-blk.c
virtio-blk.c	virtio: increase virtqueue size for virtio-scsi and virtio-blk	2020-02-22 08:26:47 +00:00
xen_blkif.h
xen-block.c