Re: [Qemu-devel] [PATCH v3 7/7] virtio/vhost.c: vhost-pci needs remote gpa

[Stefan Hajnoczi]

On Tue, Dec 05, 2017 at 11:33:16AM +0800, Wei Wang wrote:
> The vhost-pci driver uses the remote guest physical address to send/receive
> packets from the remote guest, so when sending the ving info to the vhost-pci
> device, send the guest physical adress directly.
> 
> Signed-off-by: Wei Wang <address@hidden>
> ---
>  hw/virtio/vhost.c | 56 
> +++++++++++++++++++++++++++++++++++--------------------
>  1 file changed, 36 insertions(+), 20 deletions(-)

Can you do it inside vhost_memory_map()/vhost_memory_unmap() instead of
modifying callers?

Looks like vhost_dev_has_iommu() already takes this approach:

  static void *vhost_memory_map(struct vhost_dev *dev, hwaddr addr,
                                hwaddr *plen, int is_write)
  {
      if (!vhost_dev_has_iommu(dev)) {
          return cpu_physical_memory_map(addr, plen, is_write);
      } else {
          return (void *)(uintptr_t)addr;
      }
  }

  static void vhost_memory_unmap(struct vhost_dev *dev, void *buffer,
                                 hwaddr len, int is_write,
                                 hwaddr access_len)
  {
      if (!vhost_dev_has_iommu(dev)) {
          cpu_physical_memory_unmap(buffer, len, is_write, access_len);
      }
  }

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