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Re: [Xen-devel] [PATCH v3 15/16] x86/VPMU: NMI-based VPMU support
On 01/16/2014 04:35 AM, Jan Beulich wrote:
+/* Process the softirq set by PMU NMI handler */
+static void pmu_softnmi(void)
+{
+ struct cpu_user_regs *regs;
+ struct vcpu *v, *sampled = per_cpu(sampled_vcpu, smp_processor_id());
+
+ if ( vpmu_mode & XENPMU_MODE_PRIV ||
+ sampled->domain->domain_id >= DOMID_FIRST_RESERVED )
+ v = dom0->vcpu[smp_processor_id()];
+ else
+ v = sampled;
+
+ regs = &v->arch.vpmu.xenpmu_data->pmu.regs;
+ if ( is_hvm_domain(sampled->domain) )
+ {
+ struct segment_register cs;
+
+ hvm_get_segment_register(sampled, x86_seg_cs, &cs);
+ regs->cs = cs.attr.fields.dpl;
+ }
+
+ send_guest_vcpu_virq(v, VIRQ_XENPMU);
+}
Perhaps I should have asked this on an earlier patch already:
How is this supposed to work for a 32-bit HVM guest?
struct cpu_user_regs is clearly different for it than what the
hypervisor or a 64-bit HVM guest would use.
Right, I need to XLAT_cpu_user_regs() for 32-bit HVM guest in
vpmu_interrupt() (I already do it for a PV guest).
Thanks.
-boris
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