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Re: [Qemu-devel] State of KVM bits in linux-headers


From: Anthony Liguori
Subject: Re: [Qemu-devel] State of KVM bits in linux-headers
Date: Wed, 11 Jan 2012 13:52:07 -0600
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.23) Gecko/20110922 Lightning/1.0b2 Thunderbird/3.1.15

On 01/11/2012 01:48 PM, Jan Kiszka wrote:
On 2012-01-11 20:46, Alexander Graf wrote:

On 11.01.2012, at 20:41, Anthony Liguori wrote:

On 01/11/2012 01:38 PM, Jan Kiszka wrote:

I would like to see us avoiding this in the future. Headers update
patches should mention the source and should not be merged until the ABI
changes actually made it at least into kvm.git. Same applies, of course,
to the functional changes related to that ABI. Otherwise we risk quite
some mess on everyone's side.

I agree.

Another thing: KVM_CAP_PPC_HIOR has been removed again from the kernel
and also the header. Is there real free space now or will the cap
reappear? If there should better be a placeholder, let's add it (to the
kernel).

I will reappear with ONE_REG semantics.


OK.

Then please clean up now so that update-linux-headers.sh can be used
again by "normal" developers. :)

Before we did submodules and had a responsive BIOS maintainer, we maintained 
patches within qemu.git for our external dependencies.  I think that's a good 
strategy here too.  It's a little painful, but not entirely awful.

At least it makes it possible for you to (hopefully) trivial rebase a patch if 
something is still in limbo.

Yeah, that works. I can easily script that part. It doesn't solve the actual 
underlying problem though that we don't know when the abi is actually stable. 
I'm slowly starting to understand Pekka ;).

IIRC, we never had this problem with qemu-kvm - as the merges were
coordinated with the kernel (subsystem) tree.

Are you suggesting that kvm header updates go through uq/master? That seems reasonable to me and is certainly the least amount of change.

Regards,

Anthony Liguori


Jan





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