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

From PGNet Dev <pgnet.dev@gmail.com>
Newsgroups linux.kernel
Subject Re: [Xen-devel] HPET enabled in BIOS, not presented as available_clocksource -- config, kernel code, &/or BIOS?
Date 2017-05-13 21:50 +0200
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On 5/13/17 12:38 PM, Andrew Cooper wrote:
> What is the issue here?
> 
> Xen owns (and may use) any HPETs in the system.  They are purposefully
> unavailable to even dom0.

The issue is that, when booting to Xen, hpet is not advertised as an available clocksource, AND reports the hpet boot error pointed out by Randy.

Following 

  https://wiki.xen.org/wiki/Xen_power_management#HPET_as_broadcast_timer_source_.28clocksource.29_.3D

there's discussion there re: 'if HPET is available / not missing'.

It appears to be available only booting to non-Xen.

What specific indication does one look for that Xen's using available hpet?

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HPET enabled in BIOS, not presented as available_clocksource --  config, kernel code, &/or BIOS? PGNet Dev <pgnet.dev@gmail.com> - 2017-05-13 04:40 +0200
  Re: HPET enabled in BIOS, not presented as available_clocksource --  config, kernel code, &/or BIOS? Randy Dunlap <rdunlap@infradead.org> - 2017-05-13 19:50 +0200
    Re: HPET enabled in BIOS, not presented as available_clocksource --  config, kernel code, &/or BIOS? PGNet Dev <pgnet.dev@gmail.com> - 2017-05-13 20:30 +0200
      Re: HPET enabled in BIOS, not presented as available_clocksource --  config, kernel code, &/or BIOS? Randy Dunlap <rdunlap@infradead.org> - 2017-05-13 21:30 +0200
        Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? PGNet Dev <pgnet.dev@gmail.com> - 2017-05-13 21:50 +0200
          Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? Andrew Cooper <andrew.cooper3@citrix.com> - 2017-05-13 22:00 +0200
            Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? PGNet Dev <pgnet.dev@gmail.com> - 2017-05-13 22:10 +0200
              Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? Andrew Cooper <andrew.cooper3@citrix.com> - 2017-05-13 22:20 +0200
                Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? PGNet Dev <pgnet.dev@gmail.com> - 2017-05-13 23:10 +0200
                Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? Juergen Gross <jgross@suse.com> - 2017-05-14 19:20 +0200
              Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? Valentin Vidic <Valentin.Vidic@CARNet.hr> - 2017-05-13 22:30 +0200
                Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? PGNet Dev <pgnet.dev@gmail.com> - 2017-05-13 23:10 +0200
                Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? Valentin Vidic <Valentin.Vidic@CARNet.hr> - 2017-05-13 23:40 +0200
                Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? PGNet Dev <pgnet.dev@gmail.com> - 2017-05-14 00:00 +0200
                Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? Valentin Vidic <Valentin.Vidic@CARNet.hr> - 2017-05-14 00:20 +0200
                Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? PGNet Dev <pgnet.dev@gmail.com> - 2017-05-14 01:20 +0200
                Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? Andrew Cooper <andrew.cooper3@citrix.com> - 2017-05-14 17:50 +0200
                Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? Randy Dunlap <rdunlap@infradead.org> - 2017-05-14 19:50 +0200
                Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2017-05-15 20:10 +0200
                Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? PGNet Dev <pgnet.dev@gmail.com> - 2017-05-17 02:20 +0200
        Re: [Xen-devel] HPET enabled in BIOS, not presented as  available_clocksource -- config, kernel code, &/or BIOS? Andrew Cooper <andrew.cooper3@citrix.com> - 2017-05-13 22:10 +0200
    Re: HPET enabled in BIOS, not presented as available_clocksource --  config, kernel code, &/or BIOS? PGNet Dev <pgnet.dev@gmail.com> - 2017-05-13 22:00 +0200
    Re: HPET enabled in BIOS, not presented as available_clocksource --  config, kernel code, &/or BIOS? Clemens Ladisch <clemens@ladisch.de> - 2017-05-13 22:00 +0200

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