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vhost-user-blk: make it possible to disable write-zeroes/discard 

It is useful to have the ability to disable these features for
compatibility with older VMs that don't have these implemented.

Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Message-Id: <20220906073111.353245-4-d-tatianin@yandex-team.ru>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Daniil Tatianin 2022-09-06 10:31:09 +03:00 committed by Michael S. Tsirkin
parent d9cf55a86d
commit 246db16d43
1 changed files with 4 additions and 2 deletions
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6
hw/block/vhost-user-blk.c
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@ -259,8 +259,6 @@ static uint64_t vhost_user_blk_get_features(VirtIODevice *vdev,
virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE);
virtio_add_feature(&features, VIRTIO_BLK_F_FLUSH);
virtio_add_feature(&features, VIRTIO_BLK_F_RO);
virtio_add_feature(&features, VIRTIO_BLK_F_DISCARD);
virtio_add_feature(&features, VIRTIO_BLK_F_WRITE_ZEROES);
if (s->config_wce) {
virtio_add_feature(&features, VIRTIO_BLK_F_CONFIG_WCE);
@ -598,6 +596,10 @@ static Property vhost_user_blk_properties[] = {
VHOST_USER_BLK_AUTO_NUM_QUEUES),
DEFINE_PROP_UINT32("queue-size", VHostUserBlk, queue_size, 128),
DEFINE_PROP_BIT("config-wce", VHostUserBlk, config_wce, 0, true),
DEFINE_PROP_BIT64("discard", VHostUserBlk, parent_obj.host_features,
VIRTIO_BLK_F_DISCARD, true),
DEFINE_PROP_BIT64("write-zeroes", VHostUserBlk, parent_obj.host_features,
VIRTIO_BLK_F_WRITE_ZEROES, true),
DEFINE_PROP_END_OF_LIST(),
};