Re: [PATCH] x86: add phys addr validity check for /dev/mem mmap

[Simon Jeons]

Hi H.Peter,
On 04/04/2013 09:13 AM, H. Peter Anvin wrote:
> On 04/03/2013 06:11 PM, Simon Jeons wrote:
> > Why we consider boot_cpu_data.x86_phys_bits instead of e820 map here?
> Because x86_phys_bits is what controls how much address space the
> processor has.  e820 tells us how much *RAM* the machine has, or
> specifically, how much RAM the machine had on boot.

e820 also contain mmio, correct? So cpu should not access address beyond 
e820 map(RAM+MMIO).

> 	-hpa

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/