From: "Woodhouse, David" <dwmw@amazon.co.uk>
To: "torvalds@linux-foundation.org" <torvalds@linux-foundation.org>,
"konrad.wilk@oracle.com" <konrad.wilk@oracle.com>
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Subject: Re: Redoing eXclusive Page Frame Ownership (XPFO) with isolated CPUs in mind (for KVM to isolate its guests per CPU)
Date: Mon, 20 Aug 2018 21:52:19 +0000 [thread overview]
Message-ID: <1534801939.10027.24.camel@amazon.co.uk> (raw)
In-Reply-To: <CA+55aFxZCyVZc4ZpRyZ3uDyakRSOG_=2XvnwMo4oejpsieF9=A@mail.gmail.com>
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On Mon, 2018-08-20 at 14:48 -0700, Linus Torvalds wrote:
>
> Of course, after the long (and entirely unrelated) discussion about
> the TLB flushing bug we had, I'm starting to worry about my own
> competence, and maybe I'm missing something really fundamental, and
> the XPFO patches do something else than what I think they do, or my
> "hey, let's use our Meltdown code" idea has some fundamental weakness
> that I'm missing.
The interesting part is taking the user (and other) pages out of the
kernel's 1:1 physmap.
It's the *kernel* we don't want being able to access those pages,
because of the multitude of unfixable cache load gadgets.
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Amazon Development Centre (London) Ltd. Registered in England and Wales with registration number 04543232 with its registered office at 1 Principal Place, Worship Street, London EC2A 2FA, United Kingdom.
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next prev parent reply other threads:[~2018-08-20 22:02 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-20 21:25 Redoing eXclusive Page Frame Ownership (XPFO) with isolated CPUs in mind (for KVM to isolate its guests per CPU) Konrad Rzeszutek Wilk
2018-08-20 21:48 ` Linus Torvalds
2018-08-20 21:52 ` Woodhouse, David [this message]
2018-08-20 22:18 ` Kees Cook
2018-08-20 22:27 ` Linus Torvalds
2018-08-20 22:35 ` Tycho Andersen
2018-08-20 22:59 ` Dave Hansen
2018-08-20 23:14 ` David Woodhouse
2018-08-20 23:26 ` Dave Hansen
2018-08-20 23:38 ` Linus Torvalds
2018-08-21 9:57 ` David Woodhouse
2018-08-21 14:01 ` Liran Alon
2018-08-21 14:22 ` David Woodhouse
2018-08-21 23:04 ` Liran Alon
2018-08-30 16:00 ` Julian Stecklina
2018-08-31 15:26 ` Tycho Andersen
2018-09-01 21:38 ` Linus Torvalds
2018-09-01 22:33 ` Wes Turner
2018-09-03 15:36 ` Andi Kleen
2018-09-03 14:51 ` Julian Stecklina
2018-09-12 15:37 ` Julian Stecklina
2018-09-13 6:11 ` Juerg Haefliger
2018-09-17 10:01 ` Julian Stecklina
2018-09-17 10:19 ` Tycho Andersen
2018-09-17 13:27 ` Christoph Hellwig
2018-09-14 17:06 ` Khalid Aziz
2018-09-17 9:51 ` Julian Stecklina
2018-09-18 23:00 ` Khalid Aziz
2018-09-24 14:45 ` Stecklina, Julian
2018-10-15 8:07 ` Khalid Aziz
2018-10-24 11:00 ` Khalid Aziz
2018-10-24 15:00 ` Tycho Andersen
2018-09-03 15:26 ` Andi Kleen
2018-09-04 9:37 ` Julian Stecklina
2018-09-07 21:30 ` Khalid Aziz
2018-08-31 8:43 ` James Bottomley
2018-09-19 1:03 ` Balbir Singh
2018-09-19 15:34 ` Jonathan Adams
2018-09-19 15:38 ` Jonathan Adams
2018-09-19 15:43 ` Jonathan Adams
2018-09-23 2:33 ` Balbir Singh
2018-09-25 14:12 ` Stecklina, Julian
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