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Re: [Xen-devel] [PATCH v3] x86: use a read-only IDT alias on all CPUs
- To: Andi Kleen <andi@xxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>
- From: "H. Peter Anvin" <hpa@xxxxxxxxx>
- Date: Thu, 11 Apr 2013 06:03:50 -0700
- Cc: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Alex Shi <alex.shi@xxxxxxxxx>, Will Drewry <wad@xxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Julien Tinnes <jln@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Frederic Weisbecker <fweisbec@xxxxxxxxx>, Dan Rosenberg <drosenberg@xxxxxxxxxxxxx>, x86@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Steven Rostedt <rostedt@xxxxxxxxxxx>, Borislav Petkov <borislav.petkov@xxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, kernel-hardening@xxxxxxxxxxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 11 Apr 2013 13:07:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
Kees posted that one too.
Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:
>Ingo Molnar <mingo@xxxxxxxxxx> writes:
>>
>> This looks very nice to me now. Peter, any objections?
>
>it seems pointless without randomized main kernel text location,
>because
>the IDT will be still at a known per kernel fixed writable location in
>the direct mapping.
>
>As long as such randomization is not there it just wastes a TLB entry.
>
>-Andi
--
Sent from my mobile phone. Please excuse brevity and lack of formatting.
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