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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next prev parent 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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