On Fri, 2012-09-07 at 08:43 +0100, Jan Beulich wrote:
> >>> On 06.09.12 at 17:47, Matt Fleming wrote:
> > On Thu, 2012-09-06 at 15:34 +0100, Jan Beulich wrote:
> >> >>> On 06.09.12 at 15:15, Matt Fleming wrote:
> >> > +
> >> > +pgd += i;
> >> > +save[i] = *pgd;
> >
On Fri, 2012-09-07 at 08:40 +0100, Jan Beulich wrote:
> >>> On 06.09.12 at 19:07, "H. Peter Anvin" wrote:
> > Anyone care to refresh my memory why we can't use the "global"
> > 1:1+kernel map, possibly with some improvements (which would benefit the
> > users of those maps too)? With that I mea
>>> On 06.09.12 at 17:47, Matt Fleming wrote:
> On Thu, 2012-09-06 at 15:34 +0100, Jan Beulich wrote:
>> >>> On 06.09.12 at 15:15, Matt Fleming wrote:
>> > +
>> > + pgd += i;
>> > + save[i] = *pgd;
>> > + set_pgd(pgd, efi_one_to_one_pgd[i]);
>> > + }
>>
>> Did you, as
>>> On 06.09.12 at 19:07, "H. Peter Anvin" wrote:
> Anyone care to refresh my memory why we can't use the "global"
> 1:1+kernel map, possibly with some improvements (which would benefit the
> users of those maps too)? With that I mean initial_page_map on i386 and
> trampoline_pgd on x86-64...
>>> On 06.09.12 at 17:47, Matt Fleming wrote:
> On Thu, 2012-09-06 at 15:34 +0100, Jan Beulich wrote:
>> >>> On 06.09.12 at 15:15, Matt Fleming wrote:
>> > + __flush_tlb_all();
>>
>> Is it certain you will _never_ hit a global mapping (in which case I
>> believe the above would be insufficient)
Anyone care to refresh my memory why we can't use the "global"
1:1+kernel map, possibly with some improvements (which would benefit the
users of those maps too)? With that I mean initial_page_map on i386 and
trampoline_pgd on x86-64...
-hpa
--
H. Peter Anvin, Intel Open Source Technol
On Thu, 2012-09-06 at 15:34 +0100, Jan Beulich wrote:
> >>> On 06.09.12 at 15:15, Matt Fleming wrote:
> > From: Matt Fleming
> >
> > Some firmware still needs a 1:1 (virt->phys) mapping even after we've
> > called SetVirtualAddressMap(). So install the mapping alongside our
> > existing kernel m
>>> On 06.09.12 at 15:15, Matt Fleming wrote:
> From: Matt Fleming
>
> Some firmware still needs a 1:1 (virt->phys) mapping even after we've
> called SetVirtualAddressMap(). So install the mapping alongside our
> existing kernel mapping whenever we make EFI calls in virtual mode.
>
> This bug w
From: Matt Fleming
Some firmware still needs a 1:1 (virt->phys) mapping even after we've
called SetVirtualAddressMap(). So install the mapping alongside our
existing kernel mapping whenever we make EFI calls in virtual mode.
This bug was discovered on ASUS machines where the firmware
implementat
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