Libguestfs - Jan 2017 - [PATCH] aarch64: launch: direct: Use virtio-pci devices.

As discussed yesterday:
https://www.redhat.com/archives/libguestfs/2017-January/msg00040.html
qemu and the kernel now support virtio-pci on aarch64.

It turns out that no changes are required for the libvirt backend,
since with libvirt 3.0.0 the same XML will switch to using virtio-pci
over virtio-mmio.  I have tested this on Fedora 25 with a
self-compiled libvirt 3.0.0 rc2.

However for the direct backend we do need a small change to stop using
virtio-mmio devices.  In fact this simply makes aarch64 more like
x86_64.

I have mostly tested this by running 'make check-release' but I found
a few (unconnected) problems with that so I'm still running the checks
on this one.  However it's a pretty simple and obvious change.  I did
check that the max-disks test passes.

Rich.

qemu-system-aarch64 -M virt now supports virtio-pci devices.  These
are considerably faster than virtio-mmio so use them by default.
---
 src/guestfs-internal.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/guestfs-internal.h b/src/guestfs-internal.h
index 40dad35..24a248e 100644
--- a/src/guestfs-internal.h
+++ b/src/guestfs-internal.h
@@ -145,17 +145,17 @@
 /* Differences in device names on ARM (virtio-mmio) vs normal
  * hardware with PCI.
  */
-#if !defined(__arm__) && !defined(__aarch64__)
+#if !defined(__arm__)
 #define VIRTIO_BLK "virtio-blk-pci"
 #define VIRTIO_SCSI "virtio-scsi-pci"
 #define VIRTIO_SERIAL "virtio-serial-pci"
 #define VIRTIO_NET "virtio-net-pci"
-#else /* ARM */
+#else /* ARMv7 */
 #define VIRTIO_BLK "virtio-blk-device"
 #define VIRTIO_SCSI "virtio-scsi-device"
 #define VIRTIO_SERIAL "virtio-serial-device"
 #define VIRTIO_NET "virtio-net-device"
-#endif /* ARM */
+#endif /* ARMv7 */
 
 /* Machine types. */
 #ifdef __arm__
-- 
2.9.3