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

[Avi Kivity <avi@redhat.com>]

On 12/01/2011 07:18 PM, Andreas Färber wrote:
> Am 01.12.2011 11:06, schrieb Gleb Natapov:
> > On Thu, Dec 01, 2011 at 11:54:33AM +0200, Avi Kivity wrote:
> >> On 12/01/2011 11:47 AM, Gleb Natapov wrote:
> >>> On Thu, Dec 01, 2011 at 11:41:52AM +0200, Avi Kivity wrote:
> >>>> On 12/01/2011 11:37 AM, Gleb Natapov wrote:
> >>>>>>
> >>>>>> Looks reasonable.  Should go into 1.1.  Should we backport it to
> >>>>>> 1.0.blah?  From 95c318f's description, it doesn't happen in normal
> >>>>>> circumstances.
> >>>>>>
> >>>>> To reproduce that I mappped subpage PCI bar over RAM IIRC. 
> >>>>
> >>>> In qemu 1.0, you can no longer do that (the pci bridge will not let the
> >>>> BAR override the RAM).
> >>>>
> >>>
> >>> Hmm, if this is how real HW work then problem solved :) (different HW can
> >>> behave differently, but it is reasonable to assume that on a PC memory
> >>> access below TOM will be redirected to memory controller no matter what)
>
> Ah, glad to know that x86_64 is no longer affected. What about 0.15.1?

In 0.15 this can still happen, 1.0 was fixed by the memory API.  Note
the fix is actually a side effect of a different change, and the issue
can still happen for other reasons (as in your case).


-- 
error compiling committee.c: too many arguments to function