Re: [Qemu-devel] [PATCH 2/7] QEMU does not currently support host pages that are larger than guest pages, likely due to glibc using fixed mmap requests.

[Peter Maydell]

On 19 June 2016 at 19:24, Richard Henderson <address@hidden> wrote:
> On 06/19/2016 02:46 AM, Peter Maydell wrote:
>> This is supposed to work -- for instance the linux-user/mmap.c
>> code has support for host pages and target pages not being the same.
>> In particular for ARM guests TARGET_PAGE_SIZE is 1K but the
>> host page size is 4K, so the config of "host page larger than
>> guest" isn't untested.
>
>
> You're right, it isn't untested, it's completely broken.

:-(

Is there a way we can warn about this which doesn't give
unnecessary warnings for:
 (a) the ARM case
 (b) things which don't actually care (I'm thinking the
     gcc test suite and similar stuff which doesn't actually
     mess with mmap in practice)

?

thanks
-- PMM