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

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.


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