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Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support
From: |
Christian Borntraeger |
Subject: |
Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support |
Date: |
Wed, 29 Apr 2009 13:07:32 +0200 |
User-agent: |
KMail/1.9.9 |
Am Wednesday 29 April 2009 12:50:04 schrieb Christoph Hellwig:
> On Tue, Apr 28, 2009 at 09:09:52PM +0200, Christian Borntraeger wrote:
> > Yes, virtio-scsi is also something we were thinking of. The last time we
> > discussed this idea of SCSI passthrough internally, we stumbled over error
> > recovery. Who is responsible for the error recovery? The host, the guest,
> > or both? Are there problems, which will trigger error recovery in the guest
> > and host midlayer at the same time? To be honest, my scsi knowledge is very
> > limited, so I dont know if that is a real problem.
>
> I'm not that far with planning yet. The best way would be to do real
> error handling in the host probably.
Yes, that was my impression too. The tricky part is the timeout based recovery
found in the scsi midlayer (e.g. scsi-error.c). In case of a timeout the guest
and the host will start recovery at the same time.
Christian
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, (continued)
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Christoph Hellwig, 2009/04/29
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Paul Brook, 2009/04/29
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Christoph Hellwig, 2009/04/30
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Paul Brook, 2009/04/30
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Javier Guerra, 2009/04/30
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Christian Borntraeger, 2009/04/28
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Christoph Hellwig, 2009/04/29
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support,
Christian Borntraeger <=
[Qemu-devel] [PATCH 2/2] virtio-blk: add SG_IO passthru support, Christoph Hellwig, 2009/04/28