[Xen-devel] Requesting for freeze exception for altp2m

["Sahita, Ravi" <ravi.sahita@xxxxxxxxx>]

Hi Wei,

I had already requested the freeze exception already for altp2m[0] - I'm 
reposting that request with updates for v4 of patch series, and other updates:

1. clarify the state of patch series / feature.

Reviewed        Acked   altp2m series v4
Y       N       [PATCH v3 01/15] common/domain: Helpers to pause a domain while 
in context
Status if not acked:            Good? - Jan has commented that he is ok with 
this patch
Y       Y       [PATCH v3 02/15] VMX: VMFUNC and #VE definitions and detection.
Y       Y       [PATCH v3 03/15] VMX: implement suppress #VE.
Y       N       [PATCH v3 04/15] x86/HVM: Hardware alternate p2m support 
detection
Status if not acked:            Good? no pending comments
Y       N       [PATCH v3 05/15] x86/altp2m: basic data structures and support 
routines
Status if not acked:            Working on some remaining comments from Jan. 
George ok with documentation to be added to mm-locks.h
Y       Y       [PATCH v3 06/15] VMX/altp2m: add code to support EPTP switching 
and #VE
Y       N       [PATCH v3 07/15] VMX: add VMFUNC leaf 0 (EPTP switching) to 
emulator
Status if not acked:            Some straightforward comments from Jan to be 
addressed - ack with those addressed?
Y       N       [PATCH v3 08/15] x86/altp2m: add control of suppress_ve
Status if not acked:            George's suggested patch seems acceptable - ack?
Y       Y       [PATCH v3 09/15] x86/altp2m: alternate p2m memory events
Y       N       [PATCH v3 10/15] x86/altp2m: add remaining support routines
Status if not acked:            Some things could be moved around for 'future 
patch series' - ack with that status?
Y       N       [PATCH v3 11/15] x86/altp2m: define and implement alternate p2m 
HVMOP types
Status if not acked:            main hvm op reword done - other comments being 
addressed (no major changes expected)
Y       Y       [PATCH v3 12/15] x86/altp2m: Add altp2mhvm HVM domain parameter
Y       Y       [PATCH v3 13/15] x86/altp2m: XSM hooks for altp2m HVM ops
Y       Y       [PATCH v4 14/15] tools/libxc: add support to altp2m hvmops
Y       N       [PATCH v4 15/15] tools/xen-access: altp2m testcases
Status if not acked:            Ian's questions seem answered - ack?

2. explain why it needs to be in this release (benefits).
Altp2m is a novel functionality for VM introspection with benefits for many use 
cases and consumers - see design doc at For further details:
http://lists.xenproject.org/archives/html/xen-devel/2015-06/msg01319.html

3. explain why it doesn't break things (risks).
Altp2m is default off globally, and additionally can be enabled per domain when 
opted in.
It has been tested for inter-domain and intro-domain (on legacy and new Intel 
CPUs) with support from community.
Other feedback from maintainers also suggests it is low risk:
http://lists.xen.org/archives/html/xen-devel/2015-07/msg01793.html

4. CC relevant maintainers and release manager.
Done

Per the general rules of thumb of granting freeze exception:
1. the patch series is in shape, only pending a few minor tweaks.
2. the patch series is endorsed by maintainer(s).

See previous messages from discussions stating good health of the patch series 
and low impact:
http://lists.xen.org/archives/html/xen-devel/2015-07/msg01793.html
http://lists.xen.org/archives/html/xen-devel/2015-07/msg01849.html

Cheers,
Ravi

[0] http://lists.xen.org/archives/html/xen-devel/2015-07/msg01601.html




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