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Re: [Qemu-devel] [PATCH 0/6] virtio: handle non contigious s/g entries
From: |
Igor Mammedov |
Subject: |
Re: [Qemu-devel] [PATCH 0/6] virtio: handle non contigious s/g entries |
Date: |
Wed, 28 Oct 2015 13:30:59 +0100 |
On Tue, 27 Oct 2015 13:51:20 +0200
"Michael S. Tsirkin" <address@hidden> wrote:
> On Tue, Oct 27, 2015 at 10:47:54AM +0200, Michael S. Tsirkin wrote:
> > TL;DR:
> > This fixes virtio in a way transparent to guest.
> > We should now be able to revert commits aa8580cd and df0acded19ec which
> > worked
> > around it in a way that's not transparent.
>
> I didn't check dataplane BTW. Igor? Stefan?
verified that series fixes virtio-[blk|scsi|net], all of them
hit at least one descriptor(indirect) that crosses DIMM boundary
and QEMU survived it.
However as Stefan has said virtio-blk with dataplane enabled hangs
guest instead of QEMU crashing and QEMU prints following error:
"Failed to map descriptor addr 0x1045eb000 len 106496"
I've used following CLI:
qemu-system-x86_64 -enable-kvm -enable-kvm -m 128M,slots=250,maxmem=32G
-drive if=none,id=hd,file=rhel72.img,cache=none,aio=native,format=raw -device
virtio-blk,drive=hd,scsi=off,config-wce=off,x-data-plane=on `for i in $(seq 0
15); do echo -n "-object memory-backend-ram,id=m$i,size=10M -device
pc-dimm,id=dimm$i,memdev=m$i "; done`
it hangs at boot time or on executing 'dd if=/dev/vda of=/dev/null bs 32M'
- Re: [Qemu-devel] [PATCH 4/6] virtio-serial: convert to virtio_map, (continued)
- [Qemu-devel] [PATCH 3/6] virtio-blk: convert to virtqueue_map, Michael S. Tsirkin, 2015/10/27
- [Qemu-devel] [PATCH 5/6] virtio-scsi: convert to virtqueue_map, Michael S. Tsirkin, 2015/10/27
- [Qemu-devel] [PATCH 6/6] virtio: drop virtqueue_map_sg, Michael S. Tsirkin, 2015/10/27
- Re: [Qemu-devel] [PATCH 0/6] virtio: handle non contigious s/g entries, Michael S. Tsirkin, 2015/10/27
- Re: [Qemu-devel] [PATCH 0/6] virtio: handle non contigious s/g entries, Michael S. Tsirkin, 2015/10/27
- Re: [Qemu-devel] [PATCH 0/6] virtio: handle non contigious s/g entries, Cornelia Huck, 2015/10/27