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SubjectRe: [PATCH] kvm: notify host when guest panicked
At 06/12/2012 03:49 PM, Christian Borntraeger Wrote:
>>> We have three solutions to implement this feature:
>>> 1. use vmcall
>>> 2. use I/O port
>>> 3. use virtio-serial.
>>
>>> We have decided to avoid touching hypervisor. The reason why I choose
>>> choose the I/O port is:
>>> 1. it is easier to implememt
>>> 2. it does not depend any virtual device
>>> 3. it can work when startint the kernel
>
> Havent looked deeply into that, butz wouldnt kvm_hypercall0 also fulfill all of these
> points? You just have to define the number for each architecture and then it should be
> possible to write a simple panic driver that works on all architectures.
>
>>> --- a/include/linux/kvm_para.h
>>> +++ b/include/linux/kvm_para.h
>>> @@ -20,6 +20,14 @@
>>> #define KVM_HC_FEATURES 3
>>> #define KVM_HC_PPC_MAP_MAGIC_PAGE 4
>>>
>>> +#define KVM_PV_PORT (0x505UL)
>>> +
>
> ignoring the above, shouldnt a port number go into an architecture specific file?

I am not sure whether it should be put into an architecture specific file.

Thanks
Wen Congyang

>
>
> Christian
>
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