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Re: [PATCH v4 26/30] xen/riscv: add minimal stuff to mm.h to build full Xen
- To: Oleksii <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 19 Feb 2024 09:07:22 +0100
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- Cc: Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 19 Feb 2024 08:07:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.02.2024 12:03, Oleksii wrote:
>>
>>> + } free;
>>> + } u;
>>> +
>>> + union {
>>> + /* Page is in use, but not as a shadow. */
>>
>> I'm also pretty sure I asked before what shadow this comment alludes
>> to.
> I missed your request about 'shadow' before.
>
> The comment arrived from Arm.
>
> I tried to find out the answer by investigation how 'inuse' is used,
> and, unfortunately, I couldn't find an answer what 'shadow' alludes to.
That's from x86'es shadow paging, where a page can serve as a "shadow" of
a guest page table page.
Jan
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