On 03/01/2013 03:30 PM, David Woodhouse wrote:
> On Sat, 2013-03-02 at 00:07 +0100, Borislav Petkov wrote:
>> Hmm, yeah, that's nasty. This also means option #2 can go too because
>> of the fixed addresses. Option #1 is also kinda polluting user address
>> space
>
> User address space is there to be polluted. Create a "kernel thread" for
> invoking EFI, except that this kernel thread actually has userspace page
> tables. Set up those page tables however the hell you like, and then
> just make sure you always invoke EFI runtime services from that thread.
>
Just FYI: as far as I know we already have such a "thread".
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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