From: Toshi Kani <toshi.kani@hpe.com>
To: mingo@kernel.org, bp@suse.de, hpa@zytor.com, tglx@linutronix.de
Cc: mcgrof@suse.com, jgross@suse.com, paul.gortmaker@windriver.com,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 0/2] Refactor MTRR and PAT initializations
Date: Thu, 10 Mar 2016 21:45:44 -0700 [thread overview]
Message-ID: <1457671546-13486-1-git-send-email-toshi.kani@hpe.com> (raw)
Since 'commit 9cd25aac1f44 ("x86/mm/pat: Emulate PAT when it
is disabled")', we emulate a PAT table when PAT is disabled.
This requires pat_init() be called even if PAT is disabled,
which revealed a long standing issue that PAT is left enabled
without calling pat_init() at all.
pat_init() is called from MTRR code since it relies on MTRR's
rendezvous handler to initialize PAT for all APs . However,
when CPU does not support MTRR, ex. qemu32's virtual CPU, MTRR
is set disabled and does not call pat_init(). There is no
interface available for MTRR to disable PAT, either.
This patch-set refactors MTRR and PAT initializations to make
sure that PAT is properly initialized in all cases.
---
Toshi Kani (2):
1/2 x86/mm/pat: Change pat_disable() to emulate PAT table
2/2 x86/mtrr: Refactor PAT initialization code
---
arch/x86/include/asm/mtrr.h | 6 ++-
arch/x86/include/asm/pat.h | 1 +
arch/x86/kernel/cpu/mtrr/generic.c | 24 ++++++-----
arch/x86/kernel/cpu/mtrr/main.c | 13 +++++-
arch/x86/kernel/cpu/mtrr/mtrr.h | 1 +
arch/x86/mm/pat.c | 84 +++++++++++++++++++++++---------------
6 files changed, 84 insertions(+), 45 deletions(-)
next reply other threads:[~2016-03-11 3:53 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-11 4:45 Toshi Kani [this message]
2016-03-11 4:45 ` [PATCH 1/2] x86/mm/pat: Change pat_disable() to emulate PAT table Toshi Kani
2016-03-11 9:12 ` Borislav Petkov
2016-03-11 16:27 ` Toshi Kani
2016-03-11 15:54 ` Borislav Petkov
2016-03-11 19:28 ` Toshi Kani
2016-03-12 11:55 ` Borislav Petkov
2016-03-14 21:37 ` Toshi Kani
2016-03-15 11:00 ` Borislav Petkov
2016-03-15 22:02 ` Toshi Kani
2016-03-15 0:29 ` Luis R. Rodriguez
2016-03-15 3:11 ` Toshi Kani
2016-03-15 3:11 ` Toshi Kani
2016-03-15 11:01 ` Borislav Petkov
2016-03-15 15:43 ` Toshi Kani
2016-03-15 15:43 ` Toshi Kani
2016-03-15 15:47 ` Borislav Petkov
2016-03-15 15:47 ` Borislav Petkov
2016-03-15 17:11 ` Toshi Kani
2016-03-15 16:33 ` Borislav Petkov
2016-03-15 16:33 ` Borislav Petkov
2016-03-15 17:11 ` Toshi Kani
2016-03-15 11:01 ` Borislav Petkov
2016-03-15 21:31 ` Luis R. Rodriguez
2016-03-15 21:31 ` Luis R. Rodriguez
2016-03-15 0:29 ` Luis R. Rodriguez
2016-03-11 4:45 ` [PATCH 2/2] x86/mtrr: Refactor PAT initialization code Toshi Kani
2016-03-11 9:01 ` Ingo Molnar
2016-03-11 9:13 ` Ingo Molnar
2016-03-11 18:34 ` Toshi Kani
2016-03-12 16:18 ` Ingo Molnar
2016-03-14 19:47 ` Toshi Kani
2016-03-14 22:50 ` Luis R. Rodriguez
2016-03-15 0:37 ` Toshi Kani
2016-03-15 15:56 ` Borislav Petkov
2016-03-16 15:44 ` Joe Lawrence
2016-03-11 9:24 ` Borislav Petkov
2016-03-11 18:57 ` Toshi Kani
2016-03-11 22:17 ` Luis R. Rodriguez
2016-03-11 23:56 ` Toshi Kani
2016-03-11 23:34 ` Luis R. Rodriguez
2016-03-12 1:16 ` Toshi Kani
2016-03-15 0:15 ` Luis R. Rodriguez
2016-03-15 23:48 ` Toshi Kani
2016-03-15 23:29 ` Luis R. Rodriguez
2016-03-17 21:56 ` Toshi Kani
2016-03-18 0:06 ` Luis R. Rodriguez
2016-03-18 21:35 ` Toshi Kani
2016-03-29 17:14 ` Luis R. Rodriguez
2016-03-29 21:46 ` Toshi Kani
2016-03-29 22:12 ` Luis R. Rodriguez
2016-03-30 0:16 ` Toshi Kani
2016-03-29 23:43 ` Luis R. Rodriguez
2016-03-30 1:07 ` Toshi Kani
2016-03-30 0:34 ` Luis R. Rodriguez
2016-04-09 2:04 ` Luis R. Rodriguez
2016-04-11 14:30 ` Toshi Kani
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