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virtio-blk: use BDRV_REQ_REGISTERED_BUF optimization hint

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Register guest RAM using BlockRAMRegistrar and set the
BDRV_REQ_REGISTERED_BUF flag so block drivers can optimize memory
accesses in I/O requests.

This is for vdpa-blk, vhost-user-blk, and other I/O interfaces that rely
on DMA mapping/unmapping.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Message-id: 20221013185908.1297568-14-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2022-10-13 14:59:08 -04:00
parent c5640b3e2f
commit baf422684d
2 changed files with 27 additions and 14 deletions
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2
include/hw/virtio/virtio-blk.h
View file

@ -19,6 +19,7 @@
#include "hw/block/block.h"
#include "sysemu/iothread.h"
#include "sysemu/block-backend.h"
#include "sysemu/block-ram-registrar.h"
#include "qom/object.h"
#define TYPE_VIRTIO_BLK "virtio-blk-device"
@ -64,6 +65,7 @@ struct VirtIOBlock {
struct VirtIOBlockDataPlane *dataplane;
uint64_t host_features;
size_t config_size;
BlockRAMRegistrar blk_ram_registrar;
};
typedef struct VirtIOBlockReq {