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Re: [Xen-devel] [PATCH] x86/viridian: Reword HV_X64_MSR_CRASH_CTL print message
- To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>, 'Wei Liu' <wl@xxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 17 Sep 2019 17:31:08 +0100
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 17 Sep 2019 16:31:27 +0000
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On 16/09/2019 14:56, Paul Durrant wrote:
>> -----Original Message-----
>> From: Wei Liu <wl@xxxxxxx>
>> Sent: 16 September 2019 14:29
>> To: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
>> Cc: Paul Durrant <Paul.Durrant@xxxxxxxxxx>; Xen-devel
>> <xen-devel@xxxxxxxxxxxxxxxxxxxx>; 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 Mon, 16 Sep 2019 at 14:13, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> wrote:
>> [...]
>>>>>>> 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.
>>>
>> Would it make sense to call dump_guest_os_id here as well? Seeing that
>> it is only printed when it was first set.
> Yes, that's not a bad idea.
This is as maybe, but still doesn't help with ambiguity because you
can't expect people to recognise guest-id's by their hex value. It also
doesn't help with the confusion of having the word viridian in the
printed string.
~Andrew
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