Re: [Xen-devel] Re: [PATCH 3/5] x86/pvclock: add vsyscall implementation

Avi Kivity
2009-10-07T21:09:42Z

On 10/07/2009 10:48 PM, Dan Magenheimer wrote:
>> We can support them by falling back to the kernel. I'm a bit worried
>> about the kernel playing with the hypervisor's version field. It's
>> better to introduce yet a new version for the kernel, and check both.
>>
> On Nehalem, apps that need timestamp information at a high
> frequency will likely use rdtsc/rdtscp directly.
>
>

Then they will get incorrect timing once they are live migrated.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.