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Re: [Qemu-devel] [PATCH 0/2] ATAPI migration fix/hack
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH 0/2] ATAPI migration fix/hack |
Date: |
Wed, 7 Jan 2015 16:26:57 +0000 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
Oops, forgot to include Kevin and Stefan on cc for this.
Dave
* Dr. David Alan Gilbert (git) (address@hidden) wrote:
> From: "Dr. David Alan Gilbert" <address@hidden>
>
> This pair of patches fixes a problem where IDE/ATAPI cdrom
> reads get lost/corrupted over migration.
>
> The first of the patches (restore atapi_dma flag) is
> a simple fix that I think is safe; it no longer causes
> corruption in the case we saw, but does still trigger
> a long timeout.
>
> The second is a hack; it throws a medium error causing
> the guest to retry the command in the case where migration
> happens just between the IDE/ATAPI command being submitted
> and the bmdma being finished. This recovers a lot
> faster than the timeout.
>
> Only tried on Linux guests so far; I think it might be possible
> to replace both of these by reparsing the command buffer for
> ATAPI; I'm just not confident I know when that's safe to do,
> and I wanted to see how disgusted people were by the 2nd hack.
>
> Dave
>
> Dr. David Alan Gilbert (2):
> Restore atapi_dma flag across migration
> atapi migration: Throw recoverable error to avoid recovery
>
> hw/ide/atapi.c | 17 +++++++++++++++++
> hw/ide/core.c | 1 +
> hw/ide/internal.h | 2 ++
> hw/ide/pci.c | 11 +++++++++++
> 4 files changed, 31 insertions(+)
>
> --
> 2.1.0
>
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- Re: [Qemu-devel] [PATCH 0/2] ATAPI migration fix/hack,
Dr. David Alan Gilbert <=