On Sun, 2008-02-03 at 19:56 -0600, Anthony Liguori wrote:
> Hi Izik,
Hi
>
> Anthony Liguori wrote:
> > Index: qemu/cpu-all.h
> > ===================================================================
> > --- qemu.orig/cpu-all.h 2008-02-01 15:24:45.000000000 -0600
> > +++ qemu/cpu-all.h 2008-02-01 15:28:48.000000000 -0600
> > @@ -695,7 +695,7 @@
> >
> > /* page related stuff */
> >
> > -#define TARGET_PAGE_SIZE (1 << TARGET_PAGE_BITS)
> > +#define TARGET_PAGE_SIZE (1ul << TARGET_PAGE_BITS)
> > #define TARGET_PAGE_MASK ~(TARGET_PAGE_SIZE - 1)
> > #define TARGET_PAGE_ALIGN(addr) (((addr) + TARGET_PAGE_SIZE - 1) &
> > TARGET_PAGE_MASK
>
> Do you recall what this change fixed? As Paul pointed out in IRC, using
> the host type here doesn't really fix the problem (target_ulong would be
> more appropriate). However, we're both curious what problem it's
> actually fixing since sign extending the int should just work.
ok the commit say:
kvm: qemu: change the type of the various page masks to unsigned long
prevents truncation with >=4GB of guest physical memory
as far as i remember it was used to address something with
cpu_physical_memory_rw() probably related to &TARGET_PAGE_SIZE
or ~TARGET_PAGE_SIZE,
the fact is that i dont know if it ever fixed anything
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