On 28/06/16 17:47, Vitaly Kuznetsov wrote:
> @@ -1808,6 +1822,8 @@ static int xen_hvm_cpu_notify(struct notifier_block
> *self, unsigned long action,
> int cpu = (long)hcpu;
> switch (action) {
> case CPU_UP_PREPARE:
> + /* vLAPIC_ID == Xen's vCPU_ID * 2 for HVM guests */
> + per_cpu(xen_vcpu_id, cpu) = cpu_physical_id(cpu) / 2;
Please do not assume or propagate this brokenness. It is incorrect in
the general case, and I will be fixing in the hypervisor in due course.
Always read the APIC_ID from the LAPIC, per regular hardware.
~Andrew
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