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

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