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From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Joao Martins <joao.m.martins@oracle.com>
Cc: Jan Beulich <JBeulich@suse.com>, Xen-devel <xen-devel@lists.xen.org>
Subject: Re: [PATCH v3 15/28] x86/cpu: Sysctl and common infrastructure for levelling context switching
Date: Tue, 15 Mar 2016 19:29:43 +0000	[thread overview]
Message-ID: <56E862A7.6020609@citrix.com> (raw)
In-Reply-To: <56E847D7.1010103@oracle.com>

On 15/03/16 17:35, Joao Martins wrote:
>
> On 03/15/2016 03:35 PM, Andrew Cooper wrote:
>> A toolstack needs to know how much control Xen has over the visible cpuid
>> values in PV guests.  Provide an explicit mechanism to query what Xen is
>> capable of.
>>
>> This interface will currently report no capabilities.  This change is
>> scaffolding for future patches, which will introduce detection and switching
>> logic, after which the interface will report hardware capabilities correctly.
>>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
>> ---
>> CC: Jan Beulich <JBeulich@suse.com>
>>
>> v3:
>>  * Reintroduce XEN_SYSCTL_get_levelling_caps (requested by Joao for some
>>    libvirt development he has planned).
> Hey Andrew,
>
> Perhaps we got mixed in between threads but just to clarify: the exposure of
> XEN_SYSCTL_get_levelling_caps isn't related to libvirt but rather related to
> libxc cpuid policy[0] for supporting CPU topology on PV guests in the purpose of
> the series I proposed here[1]. The libvirt related one was about the exposure of
> featuresets (Patch 21) and/or stabilization of hw_caps format (Patch 2). My
> apologies, if there was something I said that lead you into error.
>
> Joao
>
> [0] http://lists.xenproject.org/archives/html/xen-devel/2016-03/msg00397.html
> [1] http://lists.xenproject.org/archives/html/xen-devel/2016-02/msg03115.html

Sorry - my mistake.  Either way, you still need this hypercall and
hopefully it is in a suitable form for you to use.

~Andrew

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  reply	other threads:[~2016-03-15 19:29 UTC|newest]

Thread overview: 88+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-15 15:34 [PATCH RFC v3 00/28] x86: Improvements to cpuid handling for guests Andrew Cooper
2016-03-15 15:34 ` [PATCH v3 01/28] xen/x86: Drop unused and non-useful feature definitions Andrew Cooper
2016-03-16  7:53   ` Konrad Rzeszutek Wilk
2016-03-16  9:49     ` Andrew Cooper
2016-03-22 14:06   ` Doug Goldstein
2016-03-22 14:38     ` Jan Beulich
2016-03-15 15:34 ` [PATCH v3 02/28] xen/x86: Rename features to be closer to the vendor definitions Andrew Cooper
2016-03-16  8:01   ` Konrad Rzeszutek Wilk
2016-03-17 19:46     ` Andrew Cooper
2016-03-15 15:34 ` [PATCH v3 03/28] xen/public: Export cpu featureset information in the public API Andrew Cooper
2016-03-16  8:32   ` Konrad Rzeszutek Wilk
2016-03-22 10:39     ` Andrew Cooper
2016-03-18 15:52   ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 04/28] xen/x86: Script to automatically process featureset information Andrew Cooper
2016-03-16  8:41   ` Konrad Rzeszutek Wilk
2016-03-15 15:35 ` [PATCH v3 05/28] xen/x86: Collect more cpuid feature leaves Andrew Cooper
2016-03-16  8:50   ` Konrad Rzeszutek Wilk
2016-03-15 15:35 ` [PATCH v3 06/28] xen/x86: Mask out unknown features from Xen's capabilities Andrew Cooper
2016-03-16 18:01   ` Konrad Rzeszutek Wilk
2016-03-15 15:35 ` [PATCH v3 07/28] xen/x86: Annotate special features Andrew Cooper
2016-03-16 18:04   ` Konrad Rzeszutek Wilk
2016-03-18 16:29   ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 08/28] xen/x86: Annotate VM applicability in featureset Andrew Cooper
2016-03-16 18:15   ` Konrad Rzeszutek Wilk
2016-03-18 16:57   ` Jan Beulich
2016-03-18 18:56     ` Andrew Cooper
2016-03-21 11:53       ` Jan Beulich
2016-03-21 13:39         ` Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 09/28] xen/x86: Calculate maximum host and guest featuresets Andrew Cooper
2016-03-16 18:24   ` Konrad Rzeszutek Wilk
2016-03-18 17:09   ` Jan Beulich
2016-03-22 11:23     ` Andrew Cooper
2016-03-22 12:39       ` Jan Beulich
2016-03-22 14:37         ` Andrew Cooper
2016-03-22 14:52           ` Jan Beulich
2016-03-22 15:01             ` Andrew Cooper
2016-03-22 16:10               ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 10/28] xen/x86: Generate deep dependencies of features Andrew Cooper
2016-03-17 19:45   ` Konrad Rzeszutek Wilk
2016-03-17 20:14     ` Andrew Cooper
2016-03-17 20:32       ` Konrad Rzeszutek Wilk
2016-03-21 15:41   ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 11/28] xen/x86: Clear dependent features when clearing a cpu cap Andrew Cooper
2016-03-17 19:51   ` Konrad Rzeszutek Wilk
2016-03-17 19:56     ` Andrew Cooper
2016-03-28 15:02       ` Konrad Rzeszutek Wilk
2016-03-21 15:45   ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 12/28] xen/x86: Improve disabling of features which have dependencies Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 13/28] xen/x86: Improvements to in-hypervisor cpuid sanity checks Andrew Cooper
2016-03-21 16:11   ` Jan Beulich
2016-03-22 15:30     ` Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 14/28] x86/cpu: Move set_cpumask() calls into c_early_init() Andrew Cooper
2016-03-21 16:16   ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 15/28] x86/cpu: Sysctl and common infrastructure for levelling context switching Andrew Cooper
2016-03-15 17:35   ` Joao Martins
2016-03-15 19:29     ` Andrew Cooper [this message]
2016-03-15 19:34       ` Joao Martins
2016-03-21 16:23   ` Jan Beulich
2016-03-22 15:57     ` Andrew Cooper
2016-03-22 16:16       ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 16/28] x86/cpu: Rework AMD masking MSR setup Andrew Cooper
2016-03-21 16:51   ` Jan Beulich
2016-03-21 16:55     ` Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 17/28] x86/cpu: Rework Intel masking/faulting setup Andrew Cooper
2016-03-21 16:44   ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 18/28] x86/cpu: Context switch cpuid masks and faulting state in context_switch() Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 19/28] x86/pv: Provide custom cpumasks for PV domains Andrew Cooper
2016-03-21 16:53   ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 20/28] x86/domctl: Update PV domain cpumasks when setting cpuid policy Andrew Cooper
2016-03-21 17:06   ` Jan Beulich
2016-03-22 16:37     ` Andrew Cooper
2016-03-22 16:51       ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 21/28] xen+tools: Export maximum host and guest cpu featuresets via SYSCTL Andrew Cooper
2016-03-16 18:23   ` Wei Liu
2016-03-16 20:38     ` David Scott
2016-03-22  8:43   ` Jan Beulich
2016-03-22 20:39     ` Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 22/28] tools/libxc: Modify bitmap operations to take void pointers Andrew Cooper
2016-03-16 15:24   ` Andrew Cooper
2016-03-17 12:17   ` Wei Liu
2016-03-15 15:35 ` [PATCH v3 23/28] tools/libxc: Use public/featureset.h for cpuid policy generation Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 24/28] tools/libxc: Expose the automatically generated cpu featuremask information Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 25/28] tools: Utility for dealing with featuresets Andrew Cooper
2016-03-16 18:23   ` Wei Liu
2016-03-15 15:35 ` [PATCH v3 26/28] tools/libxc: Wire a featureset through to cpuid policy logic Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 27/28] tools/libxc: Use featuresets rather than guesswork Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 28/28] tools/libxc: Calculate xstate cpuid leaf from guest information Andrew Cooper
2016-03-16 18:23   ` Wei Liu

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