RE: [Xen-devel] [RFC] Hypercalls from HVM guests

["Yu, Ke" <ke.yu@xxxxxxxxx>]

Hi Steve, 

Nice to see you work on this item. I am implementing the HVM  guest 
para-driver(VBD/VNIF). The hypercall is part of the necessary infrastructure. 
It will be good to see your modified patch and have more discussion. 

Best Regards
Yu Ke
Intel Open Source Technology Center

Steve Ofsthun wrote:
> Hi,
> 
> I am currently working on hypercalls from HVM guests.  I started with
> a set of Intel patches posted to xen-devel last September.  I
> currently have code running for both 32-bit and 64-bit HVM guests
> running on a 64-bit hypervisor. 
> 
> I am curious why none of the original patches were accepted, and what
> I might need to do to make them acceptable.
> 
> Is other work being done in this area that hasn't been submitted?
> 
> Should I submit my version of the modified patches as is?
> 
> The following list summarizes the changes.
> 
> Hypervisor changes:
> 
> o Add vmexit handling for the VMCALL instruction.  This includes
>    adjustments to hypercall arguments due to 32-bit vs. 64-bit
> calling conventions. 
> 
> o Modify copy_to_user/copy_from_user to use hvm_copy for HVM guests.
> 
> o Modify grant table setup to properly map the grant table shared
>    data for hvm guests.
> 
> o Provide alternate headers for compiling 32-bit HVM guest code to
>    interface with a 64-bit hypervisor.  Many of the hypervisor
>    structures used for hypercalls vary between 32-bit and 64-bit
> guests. 
> 
> Dom 0 changes:
> 
> o Modify HVM building to properly map in a xen start info page and
>    the shared info page for event channel notifications.
> 
> o Add a virtual PCI device to QEMU to facilitate event channel
> handling. 
> 
> Dom U (HVM) driver changes:
> 
> o Modify grant table setup for HVM guest code.
> 
> o Modify event channel handling to interface with an unmodified Linux
>    kernel running as an HVM guest.
> 
> o Make misc xen support available as a loadable module.
> 
> Steve

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