Re: [Xen-devel] HPET enabled in BIOS, not presented as available_clocksource -- config, kernel code, &/or BIOS?

[PGNet Dev <pgnet.dev@xxxxxxxxx>]

On 5/13/17 3:15 PM, Valentin Vidic wrote:
> Try booting without 'hpet=force,verbose clocksource=hpet' and it should
> select xen by default:

Nope. Well, not quite ...

With both 

        'hpet=force,verbose clocksource=hpet'

removed, I end up with

        cat /sys/devices/system/clocksource/clocksource0/available_clocksource
                tsc xen
        cat /sys/devices/system/clocksource/clocksource0/current_clocksource
                tsc

But with 

        clocksource=xen

*explicitly* added

        cat /sys/devices/system/clocksource/clocksource0/available_clocksource
                tsc xen
        cat /sys/devices/system/clocksource/clocksource0/current_clocksourcexen
                xen

and in *console*, NOT dmesg, output,

        grep -i hpet tmp.txt
                (XEN) ACPI: HPET 9E8298F8, 0038 (r1 SUPERM SMCI--MB  1072009 
AMI.        5)
                (XEN) ACPI: HPET id: 0x8086a701 base: 0xfed00000
                (XEN) [VT-D] MSI HPET: 0000:f0:0f.0
                (XEN) Platform timer is 14.318MHz HPET
                [    0.000000] ACPI: HPET 0x000000009E8298F8 000038 (v01 SUPERM 
SMCI--MB 01072009 AMI. 000000
                [    0.000000] ACPI: HPET id: 0x8086a701 base: 0xfed00000
                [    0.000000] ACPI: HPET 0x000000009E8298F8 000038 (v01 SUPERM 
SMCI--MB 01072009 AMI. 000000
                [    0.000000] ACPI: HPET id: 0x8086a701 base: 0xfed00000
                [    8.515245] hpet_acpi_add: no address or irqs in _CRS
                [    8.515245] hpet_acpi_add: no address or irqs in _CRS
                (XEN) [2017-05-13 23:04:27] HVM1 save: HPET



and

        dmesg | grep -i clocksource | grep -v line:
                [    0.000000] clocksource: refined-jiffies: mask: 0xffffffff 
max_cycles: 0xffffffff, max_idle_ns: 7645519600211568 ns
                [    0.004000] clocksource: xen: mask: 0xffffffffffffffff 
max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns
                [    0.375709] clocksource: jiffies: mask: 0xffffffff 
max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
                [    4.656634] clocksource: Switched to clocksource xen
                [    8.912897] clocksource: tsc: mask: 0xffffffffffffffff 
max_cycles: 0x2c94dffea94, max_idle_ns: 440795361700 ns

jiffies, now? hm. no idea where that came from. and why the 'tsc' ?

So I'm still unclear -- is this^ now, correctly "all" using MSI/HPET?

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