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Re: [Qemu-devel] [PATCH] linux-headers: update to 3.18-rc5


From: Ard Biesheuvel
Subject: Re: [Qemu-devel] [PATCH] linux-headers: update to 3.18-rc5
Date: Mon, 17 Nov 2014 20:01:13 +0100

On 17 November 2014 19:32, Peter Maydell <address@hidden> wrote:
> On 17 November 2014 18:28, Ard Biesheuvel <address@hidden> wrote:
>> This updates the Linux header to version 3.18-rc5, adding support for
>> (among other things) read-only memslots on ARM and arm64.
>>
>> Signed-off-by: Ard Biesheuvel <address@hidden>
>
> So, to be clear, the idea is that this should go into 2.2 because
> it (effectively) fixes a bug where running from emulated flash
> devices under KVM/ARM doesn't work?
>

To be perfectly honest: the support itself for readonly memslots under
ARM/arm64 only landed in 3.18.
However, the incorrect conditional #define of KVM_CAP_READONLY_MEM
(i.e., only if __KVM_HAVE_READONLY_MEM is defined) that interferes
with the capability detection is also fixed with this header update,
and /that/ is arguably a bugfix in itself. With that in place, QEMU is
able to correctly decide at runtime whether to use readonly memslots
or not.

> A KVM header update seems pretty safe to me; cc'ing Paolo
> as KVM maintainer to ack/nak it.
>

Regards,
Ard.



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