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

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.

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