Re: [Xen-devel] Clock interrupts + hypervisor calls

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 21 Feb 2006, at 07:39, sowmya dayanand wrote:

> Hi All,
>  
> I wanted to know if a clock interrupt from any of the guest OS  
> interrupt/preempt a hypervisor call in xen?
>  
> Eg: say the disk access hy per call is in progress and a guest OS on 
> another domain generates a clock interrupt, can this interrupt be 
> handled in the middle of the hypervisor call or does it have to wait?
There is no disc access hypercall as Xen does not do I/O itself. 
Long-lived hypercalls can be voluntarily preempted by events. The 
hypercall is resumed without the guest needing to do anything special.
 -- Keir


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