linux-kernel - Re: aio: compat

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Date:	Mon, 08 Mar 2010 17:25:24 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	linux-aio@...ck.org, Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: aio: compat_ioctl issue?

Michael Tokarev <mjt@....msk.ru> writes:

> Jeff Moyer wrote:
>> Michael Tokarev <mjt@....msk.ru> writes:
>> 
>>> Hello.
>>>
>>> I just come across a situation (next in a long row :)
>>> when on x86, 32bit userspace does not work with 64bit
>>> kernel.  This time this is about aio requests.
>>>
>>> An application submits some aio job, and it is returned
>>> immediately (from io_getevents()) with EINVAL error.
> []
>> Can you post the program, please?
>
> The program which I'm trying is quite big - it's qemu-kvm
> v. 0.12.3 compiled with --enable-linux-aio.  I bugged
> kvm folks about non-working aio support but immediately
> realized it's 32/64bit issue in the kernel, since 64bit
> kvm works just fine on the same kernel (which is 64bits).
> So I added 2 printfs into its linux-aio.c and re-run it.

[snip]

Well, I'm not experiencing such problems.  I can run a 32bit aio
application on a 64bit kernel just fine with 2.6.31, 2.6.32 and
2.6.34-rc1.

Could you maybe print out the values that are passed to io_getevents?

Thanks,
Jeff
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