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Re: [PATCH v3] xen: move per-cpu area management into common code
- To: oleksii.kurochko@xxxxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 30 Sep 2024 17:58:27 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 30 Sep 2024 15:58:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30.09.2024 17:56, oleksii.kurochko@xxxxxxxxx wrote:
> On Mon, 2024-09-30 at 17:50 +0200, oleksii.kurochko@xxxxxxxxx wrote:
>> On Mon, 2024-09-30 at 15:25 +0200, Jan Beulich wrote:
>>> On 26.09.2024 18:54, Oleksii Kurochko wrote:
>>>> --- /dev/null
>>>> +++ b/xen/arch/x86/include/asm/percpu.h
>>>> @@ -0,0 +1,14 @@
>>>> +#ifndef __X86_PERCPU_H__
>>>> +#define __X86_PERCPU_H__
>>>> +
>>>> +#define PARK_OFFLINE_CPUS
>>>> +
>>>> +/*
>>>> + * Force uses of per_cpu() with an invalid area to attempt to
>>>> access the
>>>> + * middle of the non-canonical address space resulting in a #GP,
>>>> rather than a
>>>> + * possible #PF at (NULL + a little) which has security
>>>> implications in the
>>>> + * context of PV guests.
>>>> + */
>>>> +#define INVALID_PERCPU_AREA (0x8000000000000000UL - (unsigned
>>>> long)__per_cpu_start)
>>>> +
>>>> +#endif /* __X86_PERCPU_H__ */
>>>
>>> With this file appearing, doesn't arch/x86/include/asm/Makefile
>>> want
>>> the
>>> respective line removed?
>> For sure, it should be removed ( as it was done in previous patch
>> series:
>> https://lore.kernel.org/xen-devel/e573f9d46e7af0806381f6a41af00dc415bf87bb.1727185495.git.oleksii.kurochko@xxxxxxxxx/#Z31xen:arch:x86:include:asm:Makefile
>> ).
> Actually there is the same removing in this version:
> https://lore.kernel.org/xen-devel/183f0be3788bd281067d32d35d7aedfe07bf84ab.camel@xxxxxxxxx/T/#Z2e.:..:d52cd7cddb09c3b87bc4c66458f619dbf7ac214f.1727365499.git.oleksii.kurochko::40gmail.com:1xen:arch:x86:include:asm:Makefile
Hmm, you're right. I checked more than once before writing that part of the
reply, and still got that checking wrong. I'm sorry.
Jan
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