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Re: [Qemu-devel] [PATCH 2/2] hw/arm/virt: no ITS on older machine types

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH 2/2] hw/arm/virt: no ITS on older machine types
Date: Fri, 20 Jan 2017 15:52:52 +0000

On 10 October 2016 at 17:35, Andrew Jones <address@hidden> wrote:
> We should avoid exposing new hardware (through DT and ACPI) on older
> machine types. This patch keeps 2.7 and older from changing, despite
> the introduction of ITS support for 2.8.
> Signed-off-by: Andrew Jones <address@hidden>
> ---
> As Eduardo pointed out long ago for a different reason, we should
> probably replace VirtGuestInfo with direct use of VirtMachineClass,
> like x86 has done to replace PcGuestInfo with direct use of
> PCMachineClass. I'll work on that, but wanted to get this ITS
> fixup in sooner than later, so I'm posting this patch now, which
> requires 'no_its' to be duplicated.

So this patch added a no_its flag which gets set for virt-2.7
and earlier, but there's no user-facing way to say "I'd like
a virt-2.8 board with no ITS", right? That's a bit unfortunate
because the ITS can't be migrated, which means there's no way
to ask for a post-2.7 virt board which can be migrated...

-- PMM

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