Re: [kvm-devel] [PATCH 3/3] KVM - add hypercall nr to kvm_run

[Anthony Liguori <anthony@codemonkey.ws>]

Jeff Dike wrote:
> On Tue, Jul 17, 2007 at 09:15:51AM -0500, Anthony Liguori wrote:
>   
>> I'm planning on breaking this interface again since the new hypercall 
>> API only takes 4 arguments instead of 6.
>>     
>
> Is anything written anywhere about this hypercall interface?
>   

I've posted patches.  I'll post more in the near future since we decided 
to make some rather drastic changes.  With the new patchset, guest's 
will use vmcall directly with a couple bytes of padding.  The hypervisor 
may or may not patch the calling site to use something different (like 
vmmcall).

> The thing which would make me happy (which the current code comes
> close to) is for the guest to be able to pass out Linux system calls
> with VMCALL.
>   

Within the kernel right (VMCALL is only usable in ring 1).  Is it 
terribly important to be able to pass through the syscall arguments in 
registers verses packing them in a data structure and passing a pointer 
to that structure?

Regards,

Anthony Liguori

> 				Jeff
>
>