From: Ed White <edmund.h.white@intel.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: keir@xen.org, ian.campbell@citrix.com,
Andrew Cooper <andrew.cooper3@citrix.com>,
Tim Deegan <tim@xen.org>,
xen-devel@lists.xen.org, ian.jackson@eu.citrix.com
Subject: Re: [PATCH 00/11] Alternate p2m: support multiple copies of host p2m
Date: Tue, 20 Jan 2015 10:43:41 -0800 [thread overview]
Message-ID: <54BEA1DD.70507@intel.com> (raw)
In-Reply-To: <54BE242D0200007800056CD6@mail.emea.novell.com>
On 01/20/2015 12:47 AM, Jan Beulich wrote:
>>>> On 19.01.15 at 22:54, <edmund.h.white@intel.com> wrote:
>> There's also the issue that access permissions
>> are soft state and can be reverted to default in certain cases.
>
> Some instances of which have got removed during the 4.5 cycle,
> and at least some of the remaining ones are deemed at least
> questionable too. I.e. if this reverting to default permissions
> stands in the way, propose (separate!) patches to eliminate it.
The less frequently changed state disappears the better, but it
seems there isn't any way to prevent all such events, which is
a new problem for the software these patches are meant to
enable.
So, there has to be a mechanism to notify the agent that
a piece of its state is no longer valid. I think the
challenge is figuring out how fine-grained the notification
should be.
One idea I had since yesterday is to track the minimum and
maximum mfn's ever subject to any altp2m-type modification
in a p2m. That shouldn't be very expensive, and would likely
avoid a lot of unnecessary p2m invalidation.
Ed
next prev parent reply other threads:[~2015-01-20 18:43 UTC|newest]
Thread overview: 135+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-09 21:26 [PATCH 00/11] Alternate p2m: support multiple copies of host p2m Ed White
2015-01-09 21:26 ` [PATCH 01/11] VMX: VMFUNC and #VE definitions and detection Ed White
2015-01-12 13:06 ` Andrew Cooper
2015-01-13 18:50 ` Ed White
2015-01-14 14:38 ` Andrew Cooper
2015-01-09 21:26 ` [PATCH 02/11] VMX: implement suppress #VE Ed White
2015-01-12 16:43 ` Andrew Cooper
2015-01-12 17:45 ` Ed White
2015-01-13 18:36 ` Ed White
2015-01-15 16:25 ` Tim Deegan
2015-01-15 18:46 ` Ed White
2015-01-16 17:22 ` Tim Deegan
2015-03-25 17:30 ` Ed White
2015-03-26 10:15 ` Tim Deegan
2015-01-09 21:26 ` [PATCH 03/11] x86/HVM: Hardware alternate p2m support detection Ed White
2015-01-12 17:08 ` Andrew Cooper
2015-01-12 17:46 ` Ed White
2015-01-15 16:32 ` Tim Deegan
2015-01-09 21:26 ` [PATCH 04/11] x86/MM: Improve p2m type checks Ed White
2015-01-12 17:48 ` Andrew Cooper
2015-01-13 19:39 ` Ed White
2015-01-15 16:36 ` Tim Deegan
2015-01-09 21:26 ` [PATCH 05/11] x86/altp2m: basic data structures and support routines Ed White
2015-01-13 11:28 ` Andrew Cooper
2015-01-13 19:49 ` Ed White
2015-03-25 20:59 ` Ed White
2015-03-26 10:48 ` Tim Deegan
2015-03-26 18:00 ` Ed White
2015-01-15 16:48 ` Tim Deegan
2015-01-15 16:53 ` Jan Beulich
2015-01-15 18:49 ` Ed White
2015-01-16 7:37 ` Jan Beulich
2015-01-16 17:23 ` Tim Deegan
2015-01-09 21:26 ` [PATCH 06/11] VMX/altp2m: add code to support EPTP switching and #VE Ed White
2015-01-13 11:58 ` Andrew Cooper
2015-01-15 16:56 ` Tim Deegan
2015-01-15 18:55 ` Ed White
2015-01-16 17:50 ` Tim Deegan
2015-01-16 17:57 ` Ed White
2015-01-09 21:26 ` [PATCH 07/11] x86/altp2m: introduce p2m_ram_rw_ve type Ed White
2015-01-15 17:03 ` Tim Deegan
2015-01-15 20:38 ` Ed White
2015-01-16 8:20 ` Jan Beulich
2015-01-16 17:14 ` Ed White
2015-01-19 8:49 ` Jan Beulich
2015-01-19 19:53 ` Ed White
2015-01-16 17:52 ` Tim Deegan
2015-01-16 18:35 ` Ed White
2015-01-17 9:37 ` Tim Deegan
2015-01-09 21:26 ` [PATCH 08/11] x86/altp2m: add remaining support routines Ed White
2015-01-15 17:25 ` Tim Deegan
2015-01-15 20:57 ` Ed White
2015-01-16 18:04 ` Tim Deegan
2015-01-15 17:33 ` Tim Deegan
2015-01-15 21:00 ` Ed White
2015-01-16 8:24 ` Jan Beulich
2015-01-16 17:17 ` Ed White
2015-01-19 8:52 ` Jan Beulich
2015-01-16 18:09 ` Tim Deegan
2015-01-09 21:26 ` [PATCH 09/11] x86/altp2m: define and implement alternate p2m HVMOP types Ed White
2015-01-15 17:09 ` Tim Deegan
2015-01-15 20:43 ` Ed White
2015-01-16 17:57 ` Tim Deegan
2015-01-09 21:26 ` [PATCH 10/11] x86/altp2m: fix log-dirty handling Ed White
2015-01-15 17:20 ` Tim Deegan
2015-01-15 20:49 ` Ed White
2015-01-16 17:59 ` Tim Deegan
2015-01-09 21:26 ` [PATCH 11/11] x86/altp2m: alternate p2m memory events Ed White
2015-01-09 22:06 ` [PATCH 00/11] Alternate p2m: support multiple copies of host p2m Andrew Cooper
2015-01-09 22:21 ` Ed White
2015-01-09 22:41 ` Andrew Cooper
2015-01-09 23:04 ` Ed White
2015-01-12 10:00 ` Jan Beulich
2015-01-12 17:36 ` Ed White
2015-01-13 8:56 ` Jan Beulich
2015-01-13 11:28 ` Ian Jackson
2015-01-13 17:42 ` Ed White
2015-01-12 12:17 ` Ian Jackson
2015-01-12 17:39 ` Ed White
2015-01-12 17:43 ` Ian Jackson
2015-01-12 17:50 ` Ed White
2015-01-12 18:00 ` Ian Jackson
2015-01-12 18:31 ` Ed White
2015-01-13 10:21 ` Tamas K Lengyel
2015-01-13 18:25 ` Ed White
2015-01-13 11:16 ` Ian Jackson
2015-01-12 17:51 ` Andrew Cooper
2015-01-13 19:01 ` Andrew Cooper
2015-01-13 20:02 ` Ed White
2015-01-13 20:45 ` Andrew Cooper
2015-01-13 21:30 ` Ed White
2015-01-14 7:04 ` Jan Beulich
2015-01-14 10:31 ` Tamas K Lengyel
2015-01-14 11:09 ` Jan Beulich
2015-01-14 11:28 ` Tamas K Lengyel
2015-01-14 17:35 ` Ed White
2015-01-15 8:16 ` Jan Beulich
2015-01-15 17:28 ` Ed White
2015-01-15 17:45 ` Tim Deegan
2015-01-15 18:44 ` Ed White
2015-03-04 23:06 ` Tamas K Lengyel
2015-03-04 23:41 ` Ed White
2015-03-05 10:51 ` Tamas K Lengyel
2015-03-13 17:38 ` Ed White
2015-03-05 10:36 ` Tim Deegan
2015-03-05 10:58 ` Tamas K Lengyel
2015-03-05 11:13 ` Tim Deegan
2015-01-16 7:35 ` Jan Beulich
2015-01-16 16:54 ` Ed White
2015-01-15 10:39 ` Tamas K Lengyel
2015-01-15 17:31 ` Ed White
2015-01-16 10:43 ` Tamas K Lengyel
2015-01-16 17:21 ` Ed White
2015-03-05 13:45 ` Egger, Christoph
2015-01-14 7:01 ` Jan Beulich
2015-01-15 16:15 ` Tim Deegan
2015-01-15 18:23 ` Ed White
2015-01-16 8:12 ` Jan Beulich
2015-01-16 17:01 ` Ed White
2015-01-16 18:33 ` Tim Deegan
2015-01-16 20:32 ` Ed White
2015-01-17 9:34 ` Tim Deegan
2015-01-16 21:43 ` Ed White
2015-01-17 9:49 ` Tim Deegan
2015-01-19 19:35 ` Ed White
2015-01-17 9:31 ` Tim Deegan
2015-01-17 15:01 ` Andrew Cooper
2015-01-19 12:17 ` Tim Deegan
2015-01-19 21:54 ` Ed White
2015-01-20 8:47 ` Jan Beulich
2015-01-20 18:43 ` Ed White [this message]
2015-01-22 15:42 ` Tim Deegan
2015-01-22 19:15 ` Ed White
2015-03-25 17:41 ` Ed White
2015-03-26 10:40 ` Tim Deegan
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=54BEA1DD.70507@intel.com \
--to=edmund.h.white@intel.com \
--cc=JBeulich@suse.com \
--cc=andrew.cooper3@citrix.com \
--cc=ian.campbell@citrix.com \
--cc=ian.jackson@eu.citrix.com \
--cc=keir@xen.org \
--cc=tim@xen.org \
--cc=xen-devel@lists.xen.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 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.