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

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Message-ID: <5c0c01ae-775f-55b0-934e-90f81eae8ea3@gmail.com>
Date:   Sat, 13 May 2017 16:17:57 -0700
From:   PGNet Dev <pgnet.dev@...il.com>
To:     Valentin Vidic <Valentin.Vidic@...Net.hr>
Cc:     Andrew Cooper <andrew.cooper3@...rix.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Clemens Ladisch <clemens@...isch.de>,
        xen-devel@...ts.xenproject.org
Subject: Re: [Xen-devel] HPET enabled in BIOS, not presented as
 available_clocksource -- config, kernel code, &/or BIOS?

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?