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[0/3] vhost-scsi: Fix IO hangs when using windows

Message ID 20230524233407.41432-1-michael.christie@oracle.com (mailing list archive)
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Series vhost-scsi: Fix IO hangs when using windows | expand

Message

Mike Christie May 24, 2023, 11:34 p.m. UTC 
The following patches were made over Linus's tree and fix an issue
where windows guests will send iovecs with offset/lengths that result
in IOs that are not aligned to 512. The LIO layer will then send them
to Linux's block layer but it requires 512 byte alignment, so depending
on the block driver being used we will get IO errors or hung IO.

The following patches have vhost-scsi detect when windows sends these
IOs and copy them to a bounce buffer. It then does some cleanup in
the related code.

Comments

Michael S. Tsirkin May 25, 2023, 7:59 a.m. UTC | #1 
On Wed, May 24, 2023 at 06:34:04PM -0500, Mike Christie wrote:
> The following patches were made over Linus's tree and fix an issue
> where windows guests will send iovecs with offset/lengths that result
> in IOs that are not aligned to 512. The LIO layer will then send them
> to Linux's block layer but it requires 512 byte alignment, so depending
> on the block driver being used we will get IO errors or hung IO.
> 
> The following patches have vhost-scsi detect when windows sends these
> IOs and copy them to a bounce buffer. It then does some cleanup in
> the related code.

Normally with virtio we'd have a feature bit that allows skipping alignment
checks. Teach linux to set it. Stefan, WDYT?