Re: [Qemu-devel] [PATCH v3] xen_disk: split discard input to match internal representation

2016-11-23 Thread Stefano Stabellini
On Wed, 23 Nov 2016, Olaf Hering wrote: > The guest sends discard requests as u64 sector/count pairs, but the > block layer operates internally with s64/s32 pairs. The conversion > leads to IO errors in the guest, the discard request is not processed. > > domU.cfg: > 'vdev=xvda, format=qcow2,

Re: [Qemu-devel] [PATCH v3] xen_disk: split discard input to match internal representation

2016-11-23 Thread Anthony PERARD
On Wed, Nov 23, 2016 at 10:39:12AM +, Olaf Hering wrote: > The guest sends discard requests as u64 sector/count pairs, but the > block layer operates internally with s64/s32 pairs. The conversion > leads to IO errors in the guest, the discard request is not processed. > > domU.cfg: > 'vdev

[Qemu-devel] [PATCH v3] xen_disk: split discard input to match internal representation

2016-11-23 Thread Olaf Hering
The guest sends discard requests as u64 sector/count pairs, but the block layer operates internally with s64/s32 pairs. The conversion leads to IO errors in the guest, the discard request is not processed. domU.cfg: 'vdev=xvda, format=qcow2, backendtype=qdisk, target=/x.qcow2' domU: mkfs.e