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: <20170513202811.j5mhumhvow3gadms@gavran.carpriv.carnet.hr>
Date:   Sat, 13 May 2017 22:28:11 +0200
From:   Valentin Vidic <Valentin.Vidic@...Net.hr>
To:     PGNet Dev <pgnet.dev@...il.com>
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 Sat, May 13, 2017 at 01:05:22PM -0700, PGNet Dev wrote:
> back to the error at hand ...
> 
>  xl dmesg | grep -i hpet
>   [    1.365876] hpet_acpi_add: no address or irqs in _CRS
>   [    1.365876] hpet_acpi_add: no address or irqs in _CRS
> 
> again, only present when booting with Xen.
> 
> same kernel, no Xen, no such error.

Are you sure this is `xl dmesg` and not `dmesg` output?

On Debian jessie it looks like the hypervisor is using
HPET by default as expected:

# xl dmesg | grep -i hpet
(XEN) ACPI: HPET 7986E860, 0038 (r1 SUPERM SMCI--MB        1 INTL 20091013)
(XEN) Platform timer is 14.318MHz HPET

# dmesg | grep -i hpet
[    0.000000] ACPI: HPET id: 0x8086a701 base: 0xfed00000
[   64.157167] hpet_acpi_add: no address or irqs in _CRS

-- 
Valentin