[Xen-changelog] Update __vmread()

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User lcy@xxxxxxxxxxxxxxxxxxxxxxxx
# Node ID df589c4cf1ad7c1c9edf2ce42859ba059c3e448d
# Parent  dfaf788ab18cdd92f626380ddd97a64fa92abbcd
Update __vmread()
To make it not to break the stack.

Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>
Signed-off-by: Chengyuan Li <chengyuan.li@xxxxxxxxx>

diff -r dfaf788ab18c -r df589c4cf1ad xen/include/asm-x86/vmx.h
--- a/xen/include/asm-x86/vmx.h Fri Aug 26 20:47:16 2005
+++ b/xen/include/asm-x86/vmx.h Sun Aug 28 06:55:37 2005
@@ -275,7 +275,9 @@
     return 0;
 }
 
-static inline int __vmread (unsigned long field, void *value)
+#define __vmread(x, ptr) ___vmread((x), (ptr), sizeof(*(ptr)))
+
+static always_inline int ___vmread (const unsigned long field,  void *ptr, 
const int size)
 {
     unsigned long eflags;
     unsigned long ecx = 0;
@@ -286,7 +288,23 @@
                            : "a" (field)
                            : "memory");
 
-    *((long *) value) = ecx;
+    switch (size) {
+    case 1:
+        *((u8 *) (ptr)) = ecx;
+        break;
+    case 2:
+        *((u16 *) (ptr)) = ecx;
+        break;
+    case 4:
+        *((u32 *) (ptr)) = ecx;
+        break;
+    case 8:
+        *((u64 *) (ptr)) = ecx;
+        break;
+    default:
+        domain_crash_synchronous();
+        break;
+    }
 
     __save_flags(eflags);
     if (eflags & X86_EFLAGS_ZF || eflags & X86_EFLAGS_CF)

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