[PATCH v3 03/13] arm64: improve CONFIG_STRICT_DEVMEM handling
matt at console-pimps.org
Tue Nov 25 09:39:25 PST 2014
On Tue, 18 Nov, at 01:57:02PM, Ard Biesheuvel wrote:
> Improve the handling of /dev/mem mappings under CONFIG_STRICT_DEVMEM by:
> - allowing read-only access to parts of System RAM that are not
> considered memory by the kernel, this is mainly intended for exposing
> UEFI Configuration tables to userland;
> - avoid using non-cached mappings for those parts of System RAM, as it
> may result in mismatched attributes.
Is this really the best way to expose EFI config tables?
We already have parts in /sys/firmware/efi/ and in particular we expose
the runtime mappings there for kexec on x86.
Hooking this into the /dev/mem infrastructure just seems wrong to me.
Matt Fleming, Intel Open Source Technology Center
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