| |
|
 |
|
 |
|
|
|
| |
|
|
xen-devel
Re: [Xen-devel] How EPT translates an X86_32 guest physical address?
On Wed, 2010-11-17 at 10:32 +0000, George Dunlap wrote:
> The exact implementation of 32-bit mode on a 64-bit capable processor
> is something only the engineers at Intel know; but logically yes,
> whatever it does is equivalent to first zero-extending the 32-bit
> value.
Even on x86_32 physical addresses are >32 bit (think PAE). cr3 is a
physical address, even if the register which exposes it happens to be
limited to 32 bits. cr3 has probably already been expanded to a full
physical address by the time EPT sees it and I don't think there's any
difference between 32 and 64 bit (at least in this aspect) in how EPT
handles the translation from physical address to machine address.
Ian.
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
|
|
| |
|
Home