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block/nvme: Implement .bdrv_(un)register_buf 

Forward these two calls to the IOVA manager.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20180116060901.17413-6-famz@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
master
Fam Zheng 2018-01-16 14:08:57 +08:00
parent 23d0ba9319
commit 9ed616129e
1 changed files with 24 additions and 0 deletions
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24
block/nvme.c
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@ -1147,6 +1147,27 @@ static void nvme_aio_unplug(BlockDriverState *bs)
}
}
static void nvme_register_buf(BlockDriverState *bs, void *host, size_t size)
{
int ret;
BDRVNVMeState *s = bs->opaque;
ret = qemu_vfio_dma_map(s->vfio, host, size, false, NULL);
if (ret) {
/* FIXME: we may run out of IOVA addresses after repeated
* bdrv_register_buf/bdrv_unregister_buf, because nvme_vfio_dma_unmap
* doesn't reclaim addresses for fixed mappings. */
error_report("nvme_register_buf failed: %s", strerror(-ret));
}
}
static void nvme_unregister_buf(BlockDriverState *bs, void *host)
{
BDRVNVMeState *s = bs->opaque;
qemu_vfio_dma_unmap(s->vfio, host);
}
static BlockDriver bdrv_nvme = {
.format_name = "nvme",
.protocol_name = "nvme",
@ -1172,6 +1193,9 @@ static BlockDriver bdrv_nvme = {
.bdrv_io_plug = nvme_aio_plug,
.bdrv_io_unplug = nvme_aio_unplug,
.bdrv_register_buf = nvme_register_buf,
.bdrv_unregister_buf = nvme_unregister_buf,
};
static void bdrv_nvme_init(void)