xen64: implement 64-bit update_descriptor

64-bit hypercall interface can pass a maddr in one argument rather
than splitting it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 9 insertions, 4 deletions

diff --git a/include/asm-x86/xen/hypercall.h b/include/asm-x86/xen/hypercall.h
index d9e4cf7b23ac..91cb7fd5c123 100644
--- a/include/asm-x86/xen/hypercall.h
+++ b/include/asm-x86/xen/hypercall.h
@@ -466,10 +466,15 @@ MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
                         struct desc_struct desc)
 {
         mcl->op = __HYPERVISOR_update_descriptor;
-        mcl->args[0] = maddr;
-        mcl->args[1] = maddr >> 32;
-        mcl->args[2] = desc.a;
-        mcl->args[3] = desc.b;
+        if (sizeof(maddr) == sizeof(long)) {
+                mcl->args[0] = maddr;
+                mcl->args[1] = *(unsigned long *)&desc;
+        } else {
+                mcl->args[0] = maddr;
+                mcl->args[1] = maddr >> 32;
+                mcl->args[2] = desc.a;
+                mcl->args[3] = desc.b;
+        }
 }
 
 static inline void