Re: [Xen-ia64-devel] [rfc 13/15] Kexec: offsets for EFI runtime regions

[Tristan Gingold <tgingold@xxxxxxx>]

On Fri, Aug 17, 2007 at 03:50:55PM +0900, Simon Horman wrote:
> This is used by paches that move the EFI runtime regions into what is
> normally guest space.  A description of why this mapping is made is
> included in the patch that makes the mapping.
[...]
> +/* In order for Kexec between Xen and Linux to work EFI needs
> + * to be mapped into the same place by both. It seems most convenient
> + * to make Xen do the dirty work here */
> +#define __IA64_EFI_UNCACHED_OFFSET   0xc000000000000000UL
> +#define __IA64_EFI_CACHED_OFFSET     0xf000000000000000UL

Hi,

sorry or this late comment but doesn't this code creates a security hole ?
EFI_UNCACHED_OFFSET area will be visible inside vti domains as its virtual
address is valid in these domains.

Tristan.

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