Re: [PATCH 3/4] x86, efi: Add an efi= kernel command line parameter

From: Borislav Petkov
Date: Thu Jun 06 2013 - 16:07:44 EST

On Thu, Jun 06, 2013 at 08:54:50PM +0100, Matthew Garrett wrote:
> We want both to be available when we're making the call, but I think
> we should probably enter via the high addresses. The only reason we're
> doing this at all is that some systems don't update all of their
> pointers from physical mode, and we'd prefer them to work rather than
> fault...

Actually, we do the 1:1 thing so that EFI runtime works in a kexec
kernel too. Which won't work if we use the high addresses.

However, if we can use the 1:1 map *after* SetVirtualAddressMap() has
been called with the high mappings, then my issue is solved - we drop
to using 1:1 in the kexec kernel only. But I don't think that is the


Sent from a fat crate under my desk. Formatting is fine.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at