From: Dave Hansen <dave.hansen@intel.com>
To: Kiryl Shutsemau <kas@kernel.org>
Cc: lsf-pc@lists.linux-foundation.org, linux-mm@kvack.org,
x86@kernel.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Mike Rapoport <rppt@kernel.org>,
Matthew Wilcox <willy@infradead.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Usama Arif <usama.arif@linux.dev>
Subject: Re: [LSF/MM/BPF TOPIC] 64k (or 16k) base page size on x86
Date: Thu, 19 Feb 2026 14:21:16 -0800 [thread overview]
Message-ID: <a6ff6568-0a97-4db1-a33c-4a42075d1f13@intel.com> (raw)
In-Reply-To: <aZeJP-GhoqeTtjRe@thinkstation>
On 2/19/26 14:14, Kiryl Shutsemau wrote:
>> Others mentioned this, but I think this essentially gates what you are
>> doing behind a full tree conversion over to ptdescs.
> I have not followed ptdescs closely. Need to catch up.
>
> For PoC, I will just waste full order-0 page for page table. Packing is
> not required for correctness.
Yeah, I guess padding it out is ugly but effective.
I was trying to figure out how it would apply to the KPTI pgd because we
just flip bit 12 to switch between user and kernel PGDs. But I guess the
8k of PGDs in the current allocation will fit fine in 128k, so it's
weird but functional.
next prev parent reply other threads:[~2026-02-19 22:21 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-19 15:08 Kiryl Shutsemau
2026-02-19 15:17 ` Peter Zijlstra
2026-02-19 15:20 ` Peter Zijlstra
2026-02-19 15:27 ` Kiryl Shutsemau
2026-02-19 15:33 ` Pedro Falcato
2026-02-19 15:50 ` Kiryl Shutsemau
2026-02-19 15:53 ` David Hildenbrand (Arm)
2026-02-19 19:31 ` Pedro Falcato
2026-02-19 15:39 ` David Hildenbrand (Arm)
2026-02-19 15:54 ` Kiryl Shutsemau
2026-02-19 16:09 ` David Hildenbrand (Arm)
2026-02-20 2:55 ` Zi Yan
2026-02-19 17:09 ` Kiryl Shutsemau
2026-02-20 10:24 ` David Hildenbrand (Arm)
2026-02-20 12:07 ` Kiryl Shutsemau
2026-02-20 16:30 ` David Hildenbrand (Arm)
2026-02-20 19:33 ` Kalesh Singh
2026-02-19 23:24 ` Kalesh Singh
2026-02-20 12:10 ` Kiryl Shutsemau
2026-02-20 19:21 ` Kalesh Singh
2026-02-19 17:08 ` Dave Hansen
2026-02-19 22:05 ` Kiryl Shutsemau
2026-02-20 3:28 ` Liam R. Howlett
2026-02-20 12:33 ` Kiryl Shutsemau
2026-02-20 15:17 ` Liam R. Howlett
2026-02-20 15:50 ` Kiryl Shutsemau
2026-02-19 17:30 ` Dave Hansen
2026-02-19 22:14 ` Kiryl Shutsemau
2026-02-19 22:21 ` Dave Hansen [this message]
2026-02-19 17:47 ` Matthew Wilcox
2026-02-19 22:26 ` Kiryl Shutsemau
2026-02-20 9:04 ` David Laight
2026-02-20 12:12 ` Kiryl Shutsemau
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=a6ff6568-0a97-4db1-a33c-4a42075d1f13@intel.com \
--to=dave.hansen@intel.com \
--cc=Liam.Howlett@oracle.com \
--cc=akpm@linux-foundation.org \
--cc=bp@alien8.de \
--cc=dave.hansen@linux.intel.com \
--cc=david@kernel.org \
--cc=hannes@cmpxchg.org \
--cc=kas@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=lorenzo.stoakes@oracle.com \
--cc=lsf-pc@lists.linux-foundation.org \
--cc=mingo@redhat.com \
--cc=rppt@kernel.org \
--cc=tglx@linutronix.de \
--cc=usama.arif@linux.dev \
--cc=willy@infradead.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox