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.
kvm_hypercall0? Avi said that we should avoid touching hypercall. Thanks Wen Congyang > >>> --- 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 > >
