Re: [Xen-devel] [RFC PATCH] x86/apicv: fix RTC periodic timer and apicv issue

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 06.09.16 at 13:22, <xuquan8@xxxxxxxxxx> wrote:
> On September 06, 2016 5:05 PM, Jan Beulich <JBeulich@xxxxxxxx>
>>>>> On 06.09.16 at 10:53, <xuquan8@xxxxxxxxxx> wrote:
>>> to be honest, my fix is also a tradeoff.. w/ my patch, multiple
>>> pending pt interrupt instances may be combined as one injection of
>>> guest timer interrupt..
>>>  but as Yang said, It should be ok since it happens rarely and even
>>> native OS will encounter the same problem if it disable the interrupt for 
>>> too
>>long.
>>
>>And one OS may properly deal with that situation while another might not. For
>>example, let me remind you of issues the hypervisor had in earlier days when 
>>no
>>event/softirq processing happened for long enough, resulting in time
>>management issues due to missed platform timer overflow handling. IOW an OS
>>may avoid that situation by simply not disabling IRQs for too long a time.
>>
> Thanks for your reminding,
> Jan, do you have any suggestion to fix this PT and apicv issue?
> What do you think about Kevin's?

Kevin's suggestion sounded reasonable, iirc, and I'd rely on his
and your better VMX knowledge for the low level details.

Jan


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