Re: [Xen-devel] [PATCH 1/5] public/xen.h: add flags field to vcpu_time_info

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 21/03/16 11:42, Joao Martins wrote:
>
> 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@xxxxxxxxxx>
>>> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
>> Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>>
> 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?

Just so long as it doesn't get lost.

~Andrew

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