linux-kernel - Re: [RFC PATCH 0/6] Add support for shared PTEs across processes

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Date:   Tue, 18 Jan 2022 13:41:40 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Khalid Aziz <khalid.aziz@...cle.com>, akpm@...ux-foundation.org,
        willy@...radead.org, longpeng2@...wei.com, arnd@...db.de,
        dave.hansen@...ux.intel.com, david@...hat.com, rppt@...nel.org,
        surenb@...gle.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC PATCH 0/6] Add support for shared PTEs across processes

On 1/18/22 1:19 PM, Khalid Aziz wrote:
> - Starting address must be aligned to pgdir size (512GB on x86_64)

How does this work on systems with 5-level paging where a top-level page
table entry covers 256TB?  Is the alignment requirement 512GB or 256TB?
 How does userspace figure out which alignment requirement it is subject to?