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    SubjectRe: [PATCH] kvm: notify host when guest panicked
    >> 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?


    Christian



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