[Xen-devel] [PATCH v4 4/7] DO NOT APPLY: x86/hyperv: issue an hypercall

[Wei Liu <wl@xxxxxxx>]

Test if the infrastructure works.

Signed-off-by: Wei Liu <liuwe@xxxxxxxxxxxxx>
---
 xen/arch/x86/guest/hyperv/hyperv.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/xen/arch/x86/guest/hyperv/hyperv.c 
b/xen/arch/x86/guest/hyperv/hyperv.c
index f986c1a805..536ce0d0dd 100644
--- a/xen/arch/x86/guest/hyperv/hyperv.c
+++ b/xen/arch/x86/guest/hyperv/hyperv.c
@@ -23,6 +23,7 @@
 
 #include <asm/fixmap.h>
 #include <asm/guest.h>
+#include <asm/guest/hyperv-hcall.h>
 #include <asm/guest/hyperv-tlfs.h>
 #include <asm/processor.h>
 
@@ -107,6 +108,15 @@ static void __init setup_hypercall_page(void)
     }
 
     set_fixmap_x(FIX_X_HYPERV_HCALL, mfn << PAGE_SHIFT);
+
+    /* XXX Wei: Issue an hypercall here to make sure things are set up
+     * correctly.  When there is actual use of the hypercall facility,
+     * this can be removed.
+     */
+    {
+        uint16_t r = hv_do_hypercall(0xffff, 0, 0);
+        BUG_ON(r != HV_STATUS_INVALID_HYPERCALL_CODE);
+    }
 }
 
 static void __init setup(void)
-- 
2.20.1


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