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Re: [Qemu-ppc] [Qemu-devel] [PATCH] linux-user: Tell guest about big hos

From: Richard Henderson
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH] linux-user: Tell guest about big host page sizes
Date: Thu, 05 Jun 2014 09:06:20 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

On 06/05/2014 02:43 AM, Alexander Graf wrote:
> We tell the guest its page size via AUX vectors. The guest process then uses
> this page size as information on which boundaries it can mmap() things.
> However, if the host has a bigger page size granularity than the guest, it can
> not fulfill these mmap() requests - which falls apart when MAP_FIXED is passed
> to mmap.
> So in that case, let the guest know that we're running on a bigger page size
> granularity than the target would require.
> This fixes running qemu-ppc (TARGET_PAGE_SIZE=4k) on a 64k page size ppc64 
> host
> for me.
> Signed-off-by: Alexander Graf <address@hidden>
> ---
>  linux-user/elfload.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Woot.  Obviously this won't fix all guests, only those that expect a variable
page size to begin.  But it's certainly a step forward.

Reviewed-by: Richard Henderson <address@hidden>


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