linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Scott Wood <scottwood@freescale.com>
To: Alexander Graf <agraf@suse.de>
Cc: Avi Kivity <avi@redhat.com>,
	Anthony Liguori <anthony@codemonkey.ws>,
	KVM list <kvm@vger.kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	qemu-devel <qemu-devel@nongnu.org>,
	kvm-ppc <kvm-ppc@vger.kernel.org>
Subject: Re: [Qemu-devel] [RFC] Next gen kvm api
Date: Wed, 15 Feb 2012 13:17:56 -0600	[thread overview]
Message-ID: <4F3C04E4.4090708@freescale.com> (raw)
In-Reply-To: <C2015C96-C4B7-4768-8C01-E41F4D8ED9FB@suse.de>

On 02/15/2012 05:57 AM, Alexander Graf wrote:
> 
> On 15.02.2012, at 12:18, Avi Kivity wrote:
> 
>> Well the real reason is we have an extra bit reported by page faults
>> that we can control.  Can't you set up a hashed pte that is configured
>> in a way that it will fault, no matter what type of access the guest
>> does, and see it in your page fault handler?
> 
> I might be able to synthesize a PTE that is !readable and might throw
> a permission exception instead of a miss exception. I might be able
> to synthesize something similar for booke. I don't however get any
> indication on why things failed.

On booke with ISA 2.06 hypervisor extensions, there's MAS8[VF] that will
trigger a DSI that gets sent to the hypervisor even if normal DSIs go
directly to the guest.  You'll still need to zero out the execute
permission bits.

For other booke, you could use one of the user bits in MAS3 (along with
zeroing out all the permission bits), which you could get to by doing a
tlbsx.

-Scott


  parent reply	other threads:[~2012-02-15 19:18 UTC|newest]

Thread overview: 89+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-02 16:09 [RFC] Next gen kvm api Avi Kivity
     [not found] ` <CAB9FdM9M2DWXBxxyG-ez_5igT61x5b7ptw+fKfgaqMBU_JS5aA@mail.gmail.com>
2012-02-02 22:16   ` [Qemu-devel] " Rob Earhart
2012-02-05 13:14   ` Avi Kivity
2012-02-06 17:41     ` Rob Earhart
2012-02-06 19:11       ` Anthony Liguori
2012-02-07 12:03         ` Avi Kivity
2012-02-07 15:17           ` Anthony Liguori
2012-02-07 16:02             ` Avi Kivity
2012-02-07 16:18               ` Jan Kiszka
2012-02-07 16:21                 ` Anthony Liguori
2012-02-07 16:29                   ` Jan Kiszka
2012-02-15 13:41                     ` Avi Kivity
2012-02-07 16:19               ` Anthony Liguori
2012-02-15 13:47                 ` Avi Kivity
2012-02-07 12:01       ` Avi Kivity
2012-02-03  2:09 ` Anthony Liguori
2012-02-04  2:08   ` Takuya Yoshikawa
2012-02-22 13:06     ` Peter Zijlstra
2012-02-05  9:24   ` Avi Kivity
2012-02-07  1:08   ` Alexander Graf
2012-02-07 12:24     ` Avi Kivity
2012-02-07 12:51       ` Alexander Graf
2012-02-07 13:16         ` Avi Kivity
2012-02-07 13:40           ` Alexander Graf
2012-02-07 14:21             ` Avi Kivity
2012-02-07 14:39               ` Alexander Graf
2012-02-15 11:18                 ` Avi Kivity
2012-02-15 11:57                   ` Alexander Graf
2012-02-15 13:29                     ` Avi Kivity
2012-02-15 13:37                       ` Alexander Graf
2012-02-15 13:57                         ` Avi Kivity
2012-02-15 14:08                           ` Alexander Graf
2012-02-16 19:24                             ` Avi Kivity
2012-02-16 19:34                               ` Alexander Graf
2012-02-16 19:38                                 ` Avi Kivity
2012-02-16 20:41                                   ` Scott Wood
2012-02-17  0:23                                     ` Alexander Graf
2012-02-17 18:27                                       ` Scott Wood
2012-02-18  9:49                                     ` Avi Kivity
2012-02-17  0:19                                   ` Alexander Graf
2012-02-18 10:00                                     ` Avi Kivity
2012-02-18 10:43                                       ` Alexander Graf
2012-02-15 19:17                     ` Scott Wood [this message]
2012-02-12  7:10               ` Takuya Yoshikawa
2012-02-15 13:32                 ` Avi Kivity
2012-02-07 15:23             ` Anthony Liguori
2012-02-07 15:28               ` Alexander Graf
2012-02-08 17:20               ` Alan Cox
2012-02-15 13:33               ` Avi Kivity
2012-02-15 22:14             ` Arnd Bergmann
2012-02-10  3:07   ` Jamie Lokier
2012-02-03 18:07 ` Eric Northup
2012-02-03 22:52   ` [Qemu-devel] " Anthony Liguori
2012-02-06 19:46     ` Scott Wood
2012-02-07  6:58       ` Michael Ellerman
2012-02-07 10:04         ` Alexander Graf
2012-02-15 22:21           ` Arnd Bergmann
2012-02-16  1:04             ` Michael Ellerman
2012-02-16 19:28               ` Avi Kivity
2012-02-17  0:09                 ` Michael Ellerman
2012-02-18 10:03                   ` Avi Kivity
2012-02-16 10:26             ` Avi Kivity
2012-02-07 12:28       ` Anthony Liguori
2012-02-07 12:40         ` Avi Kivity
2012-02-07 12:51           ` Anthony Liguori
2012-02-07 13:18             ` Avi Kivity
2012-02-07 15:15               ` Anthony Liguori
2012-02-07 18:28                 ` Chris Wright
2012-02-08 17:02         ` Scott Wood
2012-02-08 17:12           ` Alan Cox
2012-02-05  9:37 ` Gleb Natapov
2012-02-05  9:44   ` Avi Kivity
2012-02-05  9:51     ` Gleb Natapov
2012-02-05  9:56       ` Avi Kivity
2012-02-05 10:58         ` Gleb Natapov
2012-02-05 13:16           ` Avi Kivity
2012-02-05 16:36       ` [Qemu-devel] " Anthony Liguori
2012-02-06  9:34         ` Avi Kivity
2012-02-06 13:33           ` Anthony Liguori
2012-02-06 13:54             ` Avi Kivity
2012-02-06 14:00               ` Anthony Liguori
2012-02-06 14:08                 ` Avi Kivity
2012-02-07 18:12           ` Rusty Russell
2012-02-15 13:39             ` Avi Kivity
2012-02-15 21:59               ` Anthony Liguori
2012-02-16  8:57                 ` Gleb Natapov
2012-02-16 14:46                   ` Anthony Liguori
2012-02-16 19:34                     ` Avi Kivity
2012-02-15 23:08               ` Rusty Russell

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=4F3C04E4.4090708@freescale.com \
    --to=scottwood@freescale.com \
    --cc=agraf@suse.de \
    --cc=anthony@codemonkey.ws \
    --cc=avi@redhat.com \
    --cc=kvm-ppc@vger.kernel.org \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=qemu-devel@nongnu.org \
    /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;
as well as URLs for NNTP newsgroup(s).