Re: [Qemu-devel] [PATCH 28/35] kvm: x86: Introduce kvmclock device to save/restore its state

[Jan Kiszka]

Am 11.01.2011 00:04, Anthony Liguori wrote:
>>>   kvmclock should be created with
>>> kvm_state as a parameter and kvm_vm_ioctl() is passed the stored
>>> reference.   Taking a global reference to kvm_state in machine_init is
>>> not a bad thing, obviously the machine initialization function needs
>>> access to the kvm_state.
>>>      
>> This would also require changing sysbus interfaces for the sake of KVM's
>> "abstraction". If this is the only way forward, I could look into this.
>>
>> Still, I do not see any benefit for the affected code. You then either
>> need to "steal" a kvm_state reference from the first cpu or introduce a
>> marvelous interface like kvm_get_state() to make this work from outside
>> of the KVM core.
>>    
> 
> Or move kvm_init() to pc_init() and then pc_init() has the kvm_state
> reference.

Or pass the reference to the machine_init service to avoid duplicating
kvm_init logic for every KVM arch.

That alone would still be consistent. But as long as we do not pass a
kvm_state to each and every memory registration (for
kvm_setup_guest_memory), this all is like putting a fence around half of
your yard and only declaring it closed.

Jan

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