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Re: [Xen-devel] [PATCH] x86/viridian: Reword HV_X64_MSR_CRASH_CTL print message
- To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 16 Sep 2019 14:13:05 +0100
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- Cc: Wei Liu <wl@xxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 16 Sep 2019 13:13:20 +0000
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On 16/09/2019 13:56, Paul Durrant wrote:
>> -----Original Message-----
>> From: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
>> Sent: 16 September 2019 13:48
>> To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>; Xen-devel
>> <xen-devel@xxxxxxxxxxxxxxxxxxxx>
>> Cc: Jan Beulich <JBeulich@xxxxxxxx>; Wei Liu <wl@xxxxxxx>; Roger Pau Monne
>> <roger.pau@xxxxxxxxxx>
>> Subject: Re: [PATCH] x86/viridian: Reword HV_X64_MSR_CRASH_CTL print message
>>
>> On 15/09/2019 12:51, Paul Durrant wrote:
>>>> -----Original Message-----
>>>> From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>>>> Sent: 13 September 2019 17:04
>>>> To: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
>>>> Cc: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>; Jan Beulich
>>>> <JBeulich@xxxxxxxx>; Wei Liu
>> <wl@xxxxxxx>;
>>>> Roger Pau Monne <roger.pau@xxxxxxxxxx>; Paul Durrant
>>>> <Paul.Durrant@xxxxxxxxxx>
>>>> Subject: [PATCH] x86/viridian: Reword HV_X64_MSR_CRASH_CTL print message
>>>>
>>>> Message such as:
>>>>
>>>> (XEN) d3v0 VIRIDIAN CRASH: 51 1 ffff9700e146b000 1000 204
>>>>
>>>> have confused many people into thinking the the problem is a bug in the
>>>> viridian code. The prefix was intended to signify the use of the viridian
>>>> crash-reporting interface.
>>>>
>>>> Replace the VIRIDIAN prefix with 'reported' to reduce the confusion to
>>>> non-xen-developers trying to interpret the message.
>>> This is a message that is peculiar to Windows VMs, so how about "Windows VM
>>> CRASH"?
>> I presume you mean particular, but no - it isn't windows which is the
>> exclusive user of this interface. Linux has a driver to use it when
>> running under HyperV.
> Hmm, that's a bit odd. I thought the crash codes are Windows specific.
> Perhaps they can be distinguished in some way.
Linux sets its own guest OS identifier, which is some function of
HV_LINUX_VENDOR_ID.
> All the same, the log line needs to lead people to some way of decoding the
> magic numbers I think. How about:
>
> "VIRIDIAN REPORTED CRASH"
>
> ?
That is still just as confusing to read.
There is no way to decode the numbers without knowing what OS is
running, and simply saying "Viridian" doesn't help with that.
~Andrew
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