From: "Egger, Christoph" <chegger@amazon.de>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
Ed White <edmund.h.white@intel.com>,
xen-devel@lists.xen.org
Cc: keir@xen.org, ian.campbell@citrix.com, tim@xen.org,
ian.jackson@eu.citrix.com, jbeulich@suse.com,
Tamas K Lengyel <tamas.lengyel@zentific.com>
Subject: Re: [PATCH 00/11] Alternate p2m: support multiple copies of host p2m
Date: Thu, 5 Mar 2015 14:45:49 +0100 [thread overview]
Message-ID: <54F85E0D.6070108@amazon.de> (raw)
In-Reply-To: <54B583FC.4060800@citrix.com>
On 2015/01/13 21:45, Andrew Cooper wrote:
> On 13/01/15 20:02, Ed White wrote:
>> On 01/13/2015 11:01 AM, Andrew Cooper wrote:
>>
>>> I can't think of any reasonable case where the alternate p2m would want
>>> mappings different to the host p2m. That is to say, an altp2m will map
>>> the same set of mfns to make a guest physical address space, but may
>>> differ in page permissions and possibly p2m types.
>>>
>> The set of mfn's is the same, but I do allow gfn->mfn mappings to be
>> modified under certain circumstances. One use of this is to point the
>> same VA to different physical pages (with different access permissions)
>> in different p2m's to hide memory changes.
>
> What is the practical use of being able to play paging tricks like this
> behind a VMs back?
>
I can imagine to reduce overhead for PV frontend/backend driver
communication by saying the "mfn" is dom0's "gmfn".
Christoph
next prev parent reply other threads:[~2015-03-05 13:45 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 [this message]
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
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
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