Re: [PATCH] Fix devmem_is_allowed for below 1MB accesses for an efimachine

[H. Peter Anvin]

On 10/02/2012 02:32 PM, T Makphaibulchoke wrote:
> Changing devmem_is_allowed so that on an EFI machine, access to physical
> address below 1 MB is allowed only to physical pages that are valid in
> the EFI memory map.  This prevents the possibility of an MCE due to
> accessing an invalid physical address.

What?

That sounds like exactly the opposite of normal /dev/mem behavior... we
allow access to non-memory resources (which really could do anything if
misused), but not memory.

You seem like you're flipping it on its head.

	-hpa

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