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Re: [Qemu-ppc] [PATCH] target-ppc: fix hugepage support when using memor

From: David Gibson
Subject: Re: [Qemu-ppc] [PATCH] target-ppc: fix hugepage support when using memory-backend-file
Date: Fri, 3 Jul 2015 17:18:41 +1000
User-agent: Mutt/1.5.23 (2014-03-12)

On Thu, Jul 02, 2015 at 03:46:14PM -0500, Michael Roth wrote:
> Current PPC code relies on -mem-path being used in order for
> hugepage support to be detected. With the introduction of
> MemoryBackendFile we can now handle this via:
>   -object memory-file-backend,mem-path=...,id=hugemem0 \
>   -numa node,id=mem0,memdev=hugemem0
> Management tools like libvirt treat the 2 approaches as
> interchangeable in some cases, which can lead to user-visible
> regressions even for previously supported guest configurations.
> Fix these by also iterating through any configured memory
> backends that may be backed by hugepages.
> Since the old code assumed hugepages always backed the entirety
> of guest memory, play it safe an pick the minimum across the
> max pages sizes for all backends, even ones that aren't backed
> by hugepages.
> Cc: address@hidden
> Signed-off-by: Michael Roth <address@hidden>

Reviewed-by: David Gibson <address@hidden>

David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!

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