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From: Joao Martins <joao.m.martins@oracle.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>, Tim Deegan <tim@xen.org>,
	Keir Fraser <keir@xen.org>, Jan Beulich <jbeulich@suse.com>,
	xen-devel@lists.xen.org
Subject: Re: [PATCH 1/5] public/xen.h: add flags field to vcpu_time_info
Date: Mon, 21 Mar 2016 11:42:36 +0000	[thread overview]
Message-ID: <56EFDE2C.5000800@oracle.com> (raw)
In-Reply-To: <56EC611C.1030504@citrix.com>



On 03/18/2016 08:12 PM, Andrew Cooper wrote:
> On 17/03/16 16:12, Joao Martins wrote:
>> This field has two possible flags (as of latest pvclock ABI
>> shared with KVM).
>>
>> flags: bits in this field indicate extended capabilities
>> coordinated between the guest and the hypervisor.  Specifically
>> on KVM, availability of specific flags has to be checked in
>> 0x40000001 cpuid leaf. On Xen, we don't have that but we can
>> still check some of the flags after registering the time info
>> page since a force_update_vcpu_system_time is performed.
>>
>> Current flags are:
>>
>>  flag bit   | cpuid bit    | meaning
>> -------------------------------------------------------------
>>             |              | time measures taken across
>>      0      |      24      | multiple cpus are guaranteed to
>>             |              | be monotonic
>> -------------------------------------------------------------
>>             |              | guest vcpu has been paused by
>>      1      |     N/A      | the host
>>             |              |
>> -------------------------------------------------------------
>>
>> Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
>> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> 
> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
> 
Thanks!

> Has the Linux maintainers file been patched to include xen-devel, to
> avoid them altering our ABI unnoticed in the future?
> 
Not yet, but I had planned to do so when sending the v2 of the linux side. But
perhaps you want it beforehand?

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  reply	other threads:[~2016-03-21 11:42 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-17 16:12 [PATCH 0/5] x86/time: PVCLOCK_TSC_STABLE_BIT support Joao Martins
2016-03-17 16:12 ` [PATCH 1/5] public/xen.h: add flags field to vcpu_time_info Joao Martins
2016-03-18 20:12   ` Andrew Cooper
2016-03-21 11:42     ` Joao Martins [this message]
2016-03-21 11:43       ` Andrew Cooper
2016-03-21 11:51         ` Joao Martins
2016-03-21 15:10   ` Jan Beulich
2016-03-21 15:27     ` Andrew Cooper
2016-03-21 15:40       ` Joao Martins
2016-03-17 16:12 ` [PATCH 2/5] x86/time: implement tsc as clocksource Joao Martins
2016-03-18 20:21   ` Andrew Cooper
2016-03-21 11:43     ` Joao Martins
2016-03-22 12:41     ` Joao Martins
2016-03-22 12:46       ` Jan Beulich
2016-03-22 15:51         ` Joao Martins
2016-03-22 16:02           ` Jan Beulich
2016-03-22 20:40             ` Joao Martins
2016-03-23  7:28               ` Jan Beulich
2016-03-23 12:05                 ` Joao Martins
2016-03-23 14:05                   ` Jan Beulich
2016-03-17 16:12 ` [PATCH 3/5] x86/time: streamline platform time init on plt_init() Joao Martins
2016-03-18 20:32   ` Andrew Cooper
2016-03-21 11:45     ` Joao Martins
2016-03-17 16:12 ` [PATCH 4/5] x86/time: refactor read_platform_stime() Joao Martins
2016-03-18 20:34   ` Andrew Cooper
2016-03-21 11:45     ` Joao Martins
2016-03-21 13:08       ` Andrew Cooper
2016-03-17 16:12 ` [PATCH 5/5] x86/time: implement PVCLOCK_TSC_STABLE_BIT Joao Martins
2016-03-18 20:58   ` Andrew Cooper
2016-03-21 11:50     ` Joao Martins

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