Re: [Xen-devel] Xen not running the pmtimer's timer on VCPUs different from VCPU#0

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 03/03/2011 11:45, "Paolo Bonzini" <pbonzini@xxxxxxxxxx> wrote:

> Hi,
> 
> in order to support kdump/kexec on multiprocessor HVM guests, the patch at
> http://xenbits.xensource.com/xen-unstable.hg/rev/19907 was committed.
> The patch migrates all timers (via the pt infrastructure) to a VCPU whose
> LAPIC is configured to receive the legacy 8259 interrupts.
> 
> In doing this, however, the pmtimer is left out.  Its timer won't ever
> move away from VCPU#0.  Is there a reason for this, or is it just an
> oversight?

The pmtimer emulation isn't hooked into the vpt infrastructure, hence I
don't think its essential for it to be using pt_global_vcpu_target(). That
said it might still be a good for consistency. Something to consider after
4.1.0 is released, however.

 -- Keir

> Thanks in advance,
> 
> Paolo
> 
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