Messages in this thread | | | Date | Thu, 04 Apr 2013 09:17:27 +0800 | From | Simon Jeons <> | Subject | Re: [PATCH] x86: add phys addr validity check for /dev/mem mmap |
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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 >
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