From: Dave McCracken <dcm@mccr.org>
To: Keir Fraser <keir.fraser@eu.citrix.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
Xen Developers List <xen-devel@lists.xensource.com>
Subject: Re: [PATCH xen-unstable] Remove PSE flag from guest CR4
Date: Mon, 14 Sep 2009 12:53:38 -0500 [thread overview]
Message-ID: <200909141253.38621.dcm@mccr.org> (raw)
In-Reply-To: <C6D43F08.14B08%keir.fraser@eu.citrix.com>
On Monday 14 September 2009, Keir Fraser wrote:
> If you hide PSE in CR4 and CPUID, how does the guest know it can use
> superpages?
Linux assumes it will just work.
Since hugepages in Linux are an optional feature the kernel will boot even on
a machine that doesn't support PSE. Applications that use hugepages will get
a nasty error.
With the PSE bit set in CPUID Linux tries to do things like map the entire
kernel in hugepages.
Dave McCracken
next prev parent reply other threads:[~2009-09-14 17:53 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-14 17:27 [PATCH xen-unstable] Remove PSE flag from guest CR4 Dave McCracken
2009-09-14 17:42 ` Keir Fraser
2009-09-14 17:53 ` Dave McCracken [this message]
2009-09-14 19:07 ` Jeremy Fitzhardinge
2009-09-14 19:47 ` Dave McCracken
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=200909141253.38621.dcm@mccr.org \
--to=dcm@mccr.org \
--cc=jeremy@goop.org \
--cc=keir.fraser@eu.citrix.com \
--cc=xen-devel@lists.xensource.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.