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Subject[PATCH 49 of 55] xen64: implement 64-bit update_descriptor
Date
From
64-bit hypercall interface can pass a maddr in one argument rather
than splitting it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
include/asm-x86/xen/hypercall.h | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/include/asm-x86/xen/hypercall.h b/include/asm-x86/xen/hypercall.h
--- a/include/asm-x86/xen/hypercall.h
+++ b/include/asm-x86/xen/hypercall.h
@@ -466,10 +466,15 @@
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



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