From: Borislav Petkov <bp@suse.de>
To: Toshi Kani <toshi.kani@hpe.com>,
Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Richard Purdie <richard.purdie@linuxfoundation.org>,
Toshi Kani <toshi.kani@hp.com>,
Bruce Ashfield <bruce.ashfield@windriver.com>,
"Hart, Darren" <darren.hart@intel.com>,
"saul.wold" <saul.wold@intel.com>,
linux-kernel@vger.kernel.org
Subject: Re: runtime regression with "x86/mm/pat: Emulate PAT when it is disabled"
Date: Thu, 10 Mar 2016 18:20:29 +0100 [thread overview]
Message-ID: <20160310172029.GA2194@pd.tnic> (raw)
In-Reply-To: <1457628591.15454.542.camel@hpe.com>
On Thu, Mar 10, 2016 at 09:49:51AM -0700, Toshi Kani wrote:
> This confirms the issue - QEMU's virtual Intel CPU does not support MTRR.
>
> When MTRR is disabled, the kernel does not call pat_init(). pat_enabled()
> is still set to true when CONFIG_X86_PAT is set. CONFIG_X86_PAT depends on
> CONFIG_MTRR, and assumes that MTRR is enabled.
Aha, so "qemu32" model doesn't support MTRRs but "kvm32" does, for
example. And so do the majority of the other CPU types.
Paul, can you guys run with something else besides "qemu32"? You can
even take a 64-bit one and run a 32-bit guest on it.
:-)
--
Regards/Gruss,
Boris.
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--
next prev parent reply other threads:[~2016-03-10 17:20 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-03 20:59 runtime regression with "x86/mm/pat: Emulate PAT when it is disabled" Paul Gortmaker
2016-03-03 21:18 ` Paul Gortmaker
2016-03-04 5:02 ` Toshi Kani
2016-03-04 18:37 ` Paul Gortmaker
2016-03-04 22:12 ` Toshi Kani
2016-03-07 0:35 ` Paul Gortmaker
2016-03-07 16:03 ` Toshi Kani
[not found] ` <20160307210852.GC26051@windriver.com>
2016-03-07 23:38 ` Toshi Kani
2016-03-07 23:53 ` Paul Gortmaker
2016-03-08 0:56 ` Toshi Kani
2016-03-08 1:35 ` Toshi Kani
2016-03-08 3:28 ` Paul Gortmaker
2016-03-08 16:38 ` Toshi Kani
2016-03-10 14:42 ` Paul Gortmaker
2016-03-10 16:49 ` Toshi Kani
2016-03-10 17:20 ` Borislav Petkov [this message]
2016-03-10 19:04 ` Paul Gortmaker
2016-03-10 19:19 ` Borislav Petkov
2016-03-11 13:23 ` One Thousand Gnomes
2016-03-11 13:40 ` Borislav Petkov
2016-03-11 19:18 ` Paolo Bonzini
2016-03-11 22:16 ` Borislav Petkov
2016-03-11 22:28 ` Bruce Ashfield
2016-03-11 23:29 ` Richard Purdie
2016-03-12 12:03 ` Borislav Petkov
2016-03-10 20:12 ` Toshi Kani
2016-03-10 20:04 ` Toshi Kani
2016-03-10 19:20 ` Borislav Petkov
2016-03-10 20:24 ` Toshi Kani
2016-03-10 21:07 ` Borislav Petkov
2016-03-10 23:17 ` Toshi Kani
2016-03-08 3:16 ` Paul Gortmaker
2016-03-08 16:13 ` Toshi Kani
2016-03-08 16:03 ` Paul Gortmaker
2016-03-08 17:01 ` Toshi Kani
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=20160310172029.GA2194@pd.tnic \
--to=bp@suse.de \
--cc=bruce.ashfield@windriver.com \
--cc=darren.hart@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=paul.gortmaker@windriver.com \
--cc=richard.purdie@linuxfoundation.org \
--cc=saul.wold@intel.com \
--cc=toshi.kani@hp.com \
--cc=toshi.kani@hpe.com \
/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