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Subject: Re: [Qemu-devel] [virtio-dev] [PATCH v3 0/7] Vhost-pci for inter-VM communication

Hi Stefan,

On 12/13/2017 09:08 PM, Stefan Hajnoczi wrote:
On Wed, Dec 13, 2017 at 3:01 PM, Michael S. Tsirkin <mst@redhat.com> wrote:
On Wed, Dec 13, 2017 at 12:35:21PM +0000, Stefan Hajnoczi wrote:
I'm not saying that DPDK should use libvhost-user.  I'm saying that it's
easy to add vfio vhost-pci support (for the PCI adapter I described) to
DPDK.  This patch series would require writing a completely new slave
for vhost-pci because the device interface is so different from

The main question is how appropriate is the vhost user protocol
for passing to guests. And I am not sure at this point.

Someone should go over vhost user messages and see whether they are safe
to pass to guest. If most are then we can try the transparent approach.
If most aren't then we can't and might as well use the proposed protocol
which at least has code behind it.

I have done that:


    Set up BARs before sending a VHOST_USER_SET_MEM_TABLE to the guest.

It would require to filter out userspace_addr from the payload not to
leak other QEMU process VAs to the guest.


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