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Re: [Qemu-devel] [PATCH v2] exec.c: Fix subpage memory access to RAM Mem

From: Andreas Färber
Subject: Re: [Qemu-devel] [PATCH v2] exec.c: Fix subpage memory access to RAM MemoryRegion
Date: Fri, 09 Dec 2011 13:32:31 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111105 Thunderbird/8.0

Am 01.12.2011 10:29, schrieb Avi Kivity:
> On 11/30/2011 05:26 PM, Andreas Färber wrote:
>> Commit 95c318f5e1f88d7e5bcc6deac17330fd4806a2d3 (Fix segfault in mmio
>> subpage handling code.) prevented a segfault by making all subpage
>> registrations over an existing memory page perform an unassigned access.
>> Symptoms were writes not taking effect and reads returning zero.
>> Very small page sizes are not currently supported either,
>> so subpage memory areas cannot fully be avoided.
>> Therefore change the previous fix to use a new IO_MEM_SUBPAGE_RAM
>> instead of IO_MEM_UNASSIGNED. Suggested by Avi.
> Looks reasonable.  Should go into 1.1.

A formal Reviewed-by or Acked-by may help. :)

> Should we backport it to
> 1.0.blah?  From 95c318f's description, it doesn't happen in normal
> circumstances.

We feel it should be backported to both 1.0.x and 0.15.x, please.


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