libxl: set vuart_gfn in libxl__build_hvm

Setting vuart_gfn was missed when switching ARM guests to the PVH build.
Like libxl__build_pv, libxl__build_hvm should set state->vuart_gfn to
dom->vuart_gfn.

Without this change, xl console cannot connect to the vuart console (-t
vuart), see https://marc.info/?l=xen-devel&m=160402342101366.

Signed-off-by: Stefano Stabellini <stefano.stabell...@xilinx.com>

diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index f8661e90d4..36fe8915e7 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -1184,6 +1184,7 @@ int libxl__build_hvm(libxl__gc *gc, uint32_t domid,
         LOG(ERROR, "hvm build set params failed");
         goto out;
     }
+    state->vuart_gfn = dom->vuart_gfn;
 
     rc = hvm_build_set_xs_values(gc, domid, dom, info);
     if (rc != 0) {

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