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[Qemu-devel] Re: [PATCH 2/3] Assume PPC64 host on PPC32 KVM


From: Alexander Graf
Subject: [Qemu-devel] Re: [PATCH 2/3] Assume PPC64 host on PPC32 KVM
Date: Fri, 24 Jul 2009 15:05:58 +0200


On 24.07.2009, at 14:57, Jan Kiszka wrote:

Alexander Graf wrote:

On 24.07.2009, at 13:51, Jan Kiszka wrote:


[...]

There are no 32-bit PowerPC KVM kernels that can do dirty logging.

By design or by lack of implementation?

Lack of implementation.

And what if some other arch with support for both pops up? #ifdef
HOST_PPC is no long-term solutions. And I see no need to install a
temporary workaround given the currently existing kernel support.

I'd like to have the qemu bits sorted out while polishing the kvm parts, so when kvm support shows up mainline there's a working userspace part.

In any case, I suggest to pin down the word size and use it for all
hosts.

That would break backwards compatibility.

x86 and ia64 are little endian for which is doesn't matter, PowerPC and
s390 don't support dirty logging so far. Or what would break?

Oh you mean just always use u32* and be done with it?

Sounds appealing...

Alex





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