Re: [Xen-devel] [PATCH v7 14/19] x86/VPMU: Handle PMU interrupts for PV guests

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 06/06/2014 04:40 PM, Andrew Cooper wrote:
>   
> +
>   int vpmu_do_interrupt(struct cpu_user_regs *regs)
>   {
>       struct vcpu *v = current;
> -    struct vpmu_struct *vpmu = vcpu_vpmu(v);
> +    struct vpmu_struct *vpmu;
> Perhaps an ASSERT(system_state == SYS_STATE_active) to sanity check the
> environment before we start assuming that dom0s vcpus are constructed?
I think this may not work --- if we are being suspended we first change 
state to SYS_STATE_suspend and then start pausing domains. We may get a 
PMU interrupt between these two.
-boris

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