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| author | Roger Pau Monne <roger.pau@citrix.com> | 2021-01-18 16:33:30 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2021-02-15 15:10:14 +0100 |
| commit | 7f22201ac85186dd476d5ff8da278ab603df72b6 (patch) | |
| tree | 8cd454627085bb8322a76365264d6b793ed9268c | |
| parent | 26941eb4ca485150494379cf8f0751f426208a5b (diff) | |
| download | qemu-7f22201ac85186dd476d5ff8da278ab603df72b6.zip qemu-7f22201ac85186dd476d5ff8da278ab603df72b6.tar.gz qemu-7f22201ac85186dd476d5ff8da278ab603df72b6.tar.bz2 | |
xen-block: fix reporting of discard feature
Linux blkfront expects both "discard-granularity" and
"discard-alignment" present on xenbus in order to properly enable the
feature, not exposing "discard-alignment" left some Linux blkfront
versions with a broken discard setup. This has also been addressed in
Linux with:
https://lore.kernel.org/lkml/20210118151528.81668-1-roger.pau@citrix.com/T/#u
Fix QEMU to report a "discard-alignment" of 0, in order for it to work
with older Linux frontends.
Reported-by: Arthur Borsboom <arthurborsboom@gmail.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Message-Id: <20210118153330.82324-1-roger.pau@citrix.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
| -rw-r--r-- | hw/block/xen-block.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/hw/block/xen-block.c b/hw/block/xen-block.c index 0e7d66c..a3b69e2 100644 --- a/hw/block/xen-block.c +++ b/hw/block/xen-block.c @@ -253,6 +253,7 @@ static void xen_block_realize(XenDevice *xendev, Error **errp) xen_device_backend_printf(xendev, "feature-discard", "%u", 1); xen_device_backend_printf(xendev, "discard-granularity", "%u", conf->discard_granularity); + xen_device_backend_printf(xendev, "discard-alignment", "%u", 0); } xen_device_backend_printf(xendev, "feature-flush-cache", "%u", 1); |