Re: [Qemu-devel] BUG: QEMU aborts when setting breakpoint in gdb (bisected)

[Michael S. Tsirkin]

On Wed, Nov 06, 2013 at 06:50:05PM +0100, Paolo Bonzini wrote:
> Il 06/11/2013 18:48, Michael S. Tsirkin ha scritto:
> > This just makes the symproms go away.
> 
> That's correct.
> 
> > The real bug is exec ignores high address bits during page
> > lookups. It should fail on invalid address not access
> > a random page.
> > I'll send a patch.
> 
> The real real bug is that all address spaces should be 2^64, which you
> said you consider too intrusive a patch.

Because this will affect performance in unpredicatable way.
We can't make such changes in 1.7 IMHO:
it would need much more than just a quick "works for me".

>  I don't feel confident
> changing phys_page_find, even if it's just 2 lines.
> 
> Paolo

Well it's *obviously* broken if address is outside target address
space.
Take a look at the patch first, then argue.


-- 
MST