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

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Date:   Sun, 14 May 2017 19:13:56 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Andrew Cooper <andrew.cooper3@...rix.com>, pgnet.dev@...il.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
Cc:     Jan Beulich <JBeulich@...e.com>
Subject: Re: [Xen-devel] HPET enabled in BIOS, not presented as
 available_clocksource -- config, kernel code, &/or BIOS?

On 13/05/17 22:16, Andrew Cooper wrote:
> On 13/05/2017 21:05, PGNet Dev wrote:
>> On 5/13/17 12:59 PM, Andrew Cooper wrote:
>>> Ok.  Lack of a clocksource is to be expected.
>>>
>>> The reason why the HPETs are unavailable is that dom0 is not a position
>>> to program them; dom0 doesn't know what Xen has set up in the IDT.
>>>
>>> Use `xl dmesg` to get to the hypervisor dmesg log.  You should see
>>> mention of the HPET in there if Xen has found it.
>>
>> 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.
> 
> We don't have code like that in upstream Xen.  No function with that
> name, or a string which looks like that error message.

This is a Linux kernel message.


Juergen