From 48ff269272f18d2b8fa53cb08365df417588f585 Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Mon, 3 Mar 2014 11:30:08 +0100 Subject: dataplane: replace internal thread with IOThread Today virtio-blk dataplane uses a 1:1 device-per-thread model. Now that IOThreads have been introduced we can generalize this to N:M devices per threads. This patch drops thread code from dataplane in favor of running inside an IOThread AioContext. As a bonus we solve the case where a guest keeps submitting I/O requests while dataplane is trying to stop. Previously the dataplane thread would continue to process requests until the request gave it a break. Now we can shut down in bounded time thanks to aio_context_acquire/release. Signed-off-by: Stefan Hajnoczi --- include/hw/virtio/virtio-blk.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'include') diff --git a/include/hw/virtio/virtio-blk.h b/include/hw/virtio/virtio-blk.h index 41885da..e4c41ff 100644 --- a/include/hw/virtio/virtio-blk.h +++ b/include/hw/virtio/virtio-blk.h @@ -16,6 +16,7 @@ #include "hw/virtio/virtio.h" #include "hw/block/block.h" +#include "sysemu/iothread.h" #define TYPE_VIRTIO_BLK "virtio-blk-device" #define VIRTIO_BLK(obj) \ @@ -106,6 +107,7 @@ struct virtio_scsi_inhdr struct VirtIOBlkConf { BlockConf conf; + IOThread *iothread; char *serial; uint32_t scsi; uint32_t config_wce; @@ -140,13 +142,15 @@ typedef struct VirtIOBlock { DEFINE_BLOCK_CHS_PROPERTIES(_state, _field.conf), \ DEFINE_PROP_STRING("serial", _state, _field.serial), \ DEFINE_PROP_BIT("config-wce", _state, _field.config_wce, 0, true), \ - DEFINE_PROP_BIT("scsi", _state, _field.scsi, 0, true) + DEFINE_PROP_BIT("scsi", _state, _field.scsi, 0, true), \ + DEFINE_PROP_IOTHREAD("x-iothread", _state, _field.iothread) #else #define DEFINE_VIRTIO_BLK_PROPERTIES(_state, _field) \ DEFINE_BLOCK_PROPERTIES(_state, _field.conf), \ DEFINE_BLOCK_CHS_PROPERTIES(_state, _field.conf), \ DEFINE_PROP_STRING("serial", _state, _field.serial), \ - DEFINE_PROP_BIT("config-wce", _state, _field.config_wce, 0, true) + DEFINE_PROP_BIT("config-wce", _state, _field.config_wce, 0, true), \ + DEFINE_PROP_IOTHREAD("x-iothread", _state, _field.iothread) #endif /* __linux__ */ void virtio_blk_set_conf(DeviceState *dev, VirtIOBlkConf *blk); -- cgit v1.1