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virtio-blk: Respect discard granularity 

Report the configured granularity for discard operation to the
guest. If this is not set use the block size.

Since until now we have ignored the configured discard granularity
and always reported the block size, let's add
'report-discard-granularity' property and disable it for older
machine types to avoid migration issues.

Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20210225001239.47046-1-akihiko.odaki@gmail.com>
This commit is contained in:
Akihiko Odaki 2021-02-25 09:12:39 +09:00 committed by Stefan Hajnoczi
parent 6157b0e197
commit fb0b154c80
3 changed files with 9 additions and 1 deletions
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8
hw/block/virtio-blk.c
View File

@ -962,10 +962,14 @@ static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
blkcfg.wce = blk_enable_write_cache(s->blk);
virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues);
if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD)) {
uint32_t discard_granularity = conf->discard_granularity;
if (discard_granularity == -1 || !s->conf.report_discard_granularity) {
discard_granularity = blk_size;
}
virtio_stl_p(vdev, &blkcfg.max_discard_sectors,
s->conf.max_discard_sectors);
virtio_stl_p(vdev, &blkcfg.discard_sector_alignment,
blk_size >> BDRV_SECTOR_BITS);
discard_granularity >> BDRV_SECTOR_BITS);
/*
* We support only one segment per request since multiple segments
* are not widely used and there are no userspace APIs that allow
@ -1299,6 +1303,8 @@ static Property virtio_blk_properties[] = {
IOThread *),
DEFINE_PROP_BIT64("discard", VirtIOBlock, host_features,
VIRTIO_BLK_F_DISCARD, true),
DEFINE_PROP_BOOL("report-discard-granularity", VirtIOBlock,
conf.report_discard_granularity, true),
DEFINE_PROP_BIT64("write-zeroes", VirtIOBlock, host_features,
VIRTIO_BLK_F_WRITE_ZEROES, true),
DEFINE_PROP_UINT32("max-discard-sectors", VirtIOBlock,

1
hw/core/machine.c
View File

@ -39,6 +39,7 @@
GlobalProperty hw_compat_5_2[] = {
{ "ICH9-LPC", "smm-compat", "on"},
{ "PIIX4_PM", "smm-compat", "on"},
{ "virtio-blk-device", "report-discard-granularity", "off" },
};
const size_t hw_compat_5_2_len = G_N_ELEMENTS(hw_compat_5_2);

1
include/hw/virtio/virtio-blk.h
View File

@ -41,6 +41,7 @@ struct VirtIOBlkConf
uint16_t num_queues;
uint16_t queue_size;
bool seg_max_adjust;
bool report_discard_granularity;
uint32_t max_discard_sectors;
uint32_t max_write_zeroes_sectors;
bool x_enable_wce_if_config_wce;