Re: [PATCH 0/2 v3] kvm: notify host when guest panicked

[Wen Congyang]

This is a multi-part message in MIME format.At 03/20/2012 11:45 PM, Gleb Natapov Wrote:
> On Tue, Mar 20, 2012 at 05:59:16PM +0800, Wen Congyang wrote:
>> At 03/19/2012 03:33 PM, Wen Congyang Wrote:
>>> At 03/08/2012 03:57 PM, Wen Congyang Wrote:
>>>> We can know the guest is paniced when the guest runs on xen.
>>>> But we do not have such feature on kvm.
>>>>
>>>> Another purpose of this feature is: management app(for example:
>>>> libvirt) can do auto dump when the guest is crashed. If management
>>>> app does not do auto dump, the guest's user can do dump by hand if
>>>> he sees the guest is paniced.
>>>>
>>>> I touch the hypervisor instead of using virtio-serial, because
>>>> 1. it is simple
>>>> 2. the virtio-serial is an optional device, and the guest may
>>>>    not have such device.
>>>>
>>>> Changes from v2 to v3:
>>>> 1. correct spelling
>>>>
>>>> Changes from v1 to v2:
>>>> 1. split up host and guest-side changes
>>>> 2. introduce new request flag to avoid changing return values.
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>>>
>>>
>>> Hi all:
>>>
>>> we neet this feature, but we don't decide how to implement it.
>>> We have two solution:
>>> 1. use vmcall
>>> 2. use virtio-serial.
>>>
>>> I will not change this patch set before we decide how to do it.
>>> Can we make a decision recent days?
>>
>> Anybody can decide which solution to use?
>>
> To make an informed decision we need to have at least raw idea how
> virtio-serial variant will look.

We have three solutions now:
1. use vmcall
2. use I/O port
3. use virtio-serial

I write a sample patch of solution 2 and 3:
    patch 1: solution 2
    patch 2: solution 3

Note, ther are only sample patches, and it can work. I send them, so we
can decide which solution will be used.

Thanks
Wen Congyang



> 
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> 			Gleb.
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