From: keescook@chromium.org (Kees Cook)
To: linux-security-module@vger.kernel.org
Subject: arm64 physmap (was Re: [kernel-hardening] [PATCH 4/6] Protectable Memory)
Date: Wed, 14 Feb 2018 11:35:54 -0800 [thread overview]
Message-ID: <CAGXu5jJ2XRt3RqPPXp+CN5fhT93BpCCNUHk88aSQUWS_NJ5oxw@mail.gmail.com> (raw)
In-Reply-To: <CAGXu5j+RRiZtYfO-4Peh=FAHmUS4FThKHp-djoFgY80rebKTxQ@mail.gmail.com>
On Wed, Feb 14, 2018 at 11:29 AM, Kees Cook <keescook@chromium.org> wrote:
> Why does using finer granularity on the physmap degrade performance? I
> assume TLB pressure, but what is heavily using that area? (I must not
> be understanding what physmap actually gets used for -- I thought it
> was just a convenience to have a 1:1 virt/phys map for some lookups?)
Jann has sorted me out: it's that physmap isn't an _alias_ for the
buddy allocator memory areas; it's used directly.
-Kees
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Kees Cook
Pixel Security
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next prev parent reply other threads:[~2018-02-14 19:35 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-24 17:56 [RFC PATCH v11 0/6] mm: security: ro protection for dynamic data Igor Stoppa
2018-01-24 17:56 ` [PATCH 1/6] genalloc: track beginning of allocations Igor Stoppa
2018-01-24 17:56 ` [PATCH 2/6] genalloc: selftest Igor Stoppa
2018-01-24 17:56 ` [PATCH 3/6] struct page: add field for vm_struct Igor Stoppa
2018-01-24 17:56 ` [PATCH 4/6] Protectable Memory Igor Stoppa
2018-01-24 19:10 ` [kernel-hardening] " Jann Horn
2018-01-25 11:59 ` Igor Stoppa
2018-01-25 15:14 ` Boris Lukashev
2018-01-25 15:38 ` Jerome Glisse
2018-01-26 12:28 ` Igor Stoppa
2018-01-26 16:36 ` Boris Lukashev
2018-01-30 13:46 ` Igor Stoppa
2018-01-26 5:35 ` Matthew Wilcox
2018-01-26 11:46 ` Igor Stoppa
2018-02-02 18:39 ` Christopher Lameter
2018-02-03 15:38 ` Igor Stoppa
2018-02-03 19:57 ` Igor Stoppa
2018-02-03 20:12 ` Boris Lukashev
2018-02-03 20:32 ` Igor Stoppa
2018-02-03 22:29 ` Boris Lukashev
2018-02-04 15:05 ` Igor Stoppa
2018-02-12 23:27 ` Kees Cook
2018-02-13 0:40 ` Laura Abbott
2018-02-13 1:25 ` Kees Cook
2018-02-13 3:39 ` Jann Horn
2018-02-13 16:09 ` Laura Abbott
2018-02-13 21:43 ` Kees Cook
2018-02-14 19:06 ` arm64 physmap (was Re: [kernel-hardening] [PATCH 4/6] Protectable Memory) Laura Abbott
2018-02-14 19:28 ` Ard Biesheuvel
2018-02-14 20:13 ` Laura Abbott
2018-02-14 19:29 ` Kees Cook
2018-02-14 19:35 ` Kees Cook [this message]
2018-02-20 16:28 ` Igor Stoppa
2018-02-21 22:22 ` Kees Cook
2018-02-14 19:48 ` Kees Cook
2018-02-14 22:13 ` Tycho Andersen
2018-02-14 22:27 ` Kees Cook
[not found] ` <5a83024c.64369d0a.a1e94.cdd6SMTPIN_ADDED_BROKEN@mx.google.com>
2018-02-13 18:10 ` [kernel-hardening] [PATCH 4/6] Protectable Memory Laura Abbott
2018-02-20 17:16 ` Igor Stoppa
2018-02-21 22:37 ` Kees Cook
2018-02-05 15:40 ` Christopher Lameter
2018-02-09 11:17 ` Igor Stoppa
2018-01-26 19:41 ` Igor Stoppa
2018-01-24 17:56 ` [PATCH 5/6] Documentation for Pmalloc Igor Stoppa
2018-01-24 19:14 ` Ralph Campbell
2018-01-25 7:53 ` Igor Stoppa
2018-01-24 17:56 ` [PATCH 6/6] Pmalloc: self-test Igor Stoppa
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