On 05/28/13 12:18, Matt Wilson wrote:
> VCPUOP_set_singleshot_timer returns -EINVAL when:
> 
> 1) the specified vCPU ID is out of range (<0 or >MAX_VIRT_CPUS)
> 2) the specified vCPU ID doesn't match the running vCPU.
> 
> It seems that there is a confusion between the logical vCPU ID and the
> local APIC physical ID.
> [...]
> (XEN) Domain 1 (vcpu#16) VCPUOP_set_singleshot_timer specified vcpuid 1
> [...]
> APIC: CPU 1 has ACPI ID 16

Thanks Matt!  Looks like we need to pass our acpi_id to the Xen hypercall
instead of our cpuid.

Roger, changing the line
        int cpu = PCPU_GET(cpuid);
to
        int cpu = PCPU_GET(acpi_id);
in xentimer_et_start and xentimer_et_stop fixes this panic and gets me
slightly further; the following lines are now added to the console output
prior to the system appearing to hang:
> ioapic0: routing intpin 1 (ISA IRQ 1) to lapic 1 vector 48
> ioapic0: routing intpin 4 (ISA IRQ 4) to lapic 2 vector 48
> ioapic0: routing intpin 9 (ISA IRQ 9) to lapic 3 vector 48
> ioapic0: routing intpin 12 (ISA IRQ 12) to lapic 4 vector 48
> ioapic0: routing intpin 14 (ISA IRQ 14) to lapic 5 vector 48
> ioapic0: routing intpin 15 (ISA IRQ 15) to lapic 6 vector 48
> ioapic0: routing intpin 28 (PCI IRQ 28) to lapic 7 vector 48
> TSC timecounter discards lower 1 bit(s)
> Timecounter "TSC-low" frequency 1300024860 Hz quality -100
> WARNING: WITNESS option enabled, expect reduced performance.

On a cc2.8xlarge EC2 instance, the lines which come after this are
> GEOM: new disk xbd1
> GEOM: new disk xbd2
> GEOM: new disk xbd3
> GEOM: new disk xbd4
> Trying to mount root from ufs:/dev/ad0a [rw]...
> start_init: trying /sbin/init
and then the userland boot process; have you made any bug fixes after
your pvhvm_v7 which would explain why tasting disks was hanging?

-- 
Colin Percival
Security Officer Emeritus, FreeBSD | The power to serve
Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid

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