linux

iv/linux

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Suresh Siddha b27a43c1e9 x86, cpa: make the kernel physical mapping initialization a two pass sequence, fix

Jeremy Fitzhardinge wrote:

> I'd noticed that current tip/master hasn't been booting under Xen, and I
> just got around to bisecting it down to this change.
>
> commit 065ae73c5462d42e9761afb76f2b52965ff45bd6
> Author: Suresh Siddha <suresh.b.siddha@intel.com>
>
>    x86, cpa: make the kernel physical mapping initialization a two pass sequence
>
> This patch is causing Xen to fail various pagetable updates because it
> ends up remapping pagetables to RW, which Xen explicitly prohibits (as
> that would allow guests to make arbitrary changes to pagetables, rather
> than have them mediated by the hypervisor).

Instead of making init a two pass sequence, to satisfy the Intel's TLB
Application note (developer.intel.com/design/processor/applnots/317080.pdf
Section 6 page 26), we preserve the original page permissions
when fragmenting the large mappings and don't touch the existing memory
mapping (which satisfies Xen's requirements).

Only open issue is: on a native linux kernel, we will go back to mapping
the first 0-1GB kernel identity mapping as executable (because of the
static mapping setup in head_64.S). We can fix this in a different
patch if needed.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2008-10-10 19:29:21 +02:00

alpha

[PATCH] fix osf_getdirents()

2008-08-25 01:18:06 -04:00

arm

Merge master.kernel.org:/home/rmk/linux-2.6-arm

2008-09-08 15:50:19 -07:00

avr32

avr32: pm_standby low-power ram bug fix

2008-09-01 13:04:09 +02:00

blackfin

Blackfin arch: Fix PM building on BF52x: No ROTWE on BF52x, add USBWE