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

[Joao Martins <joao.m.martins@xxxxxxxxxx>]

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?

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