linux-kernel - PATCH: Fix SVM MSR indexes for 32bit kernel

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Date:	Fri, 29 Jun 2007 08:38:15 -0700
From:	"H. J. Lu" <hjl@...on.org>
To:	joerg.roedel@....com
Cc:	linux kernel <linux-kernel@...r.kernel.org>
Subject: PATCH: Fix SVM MSR indexes for 32bit kernel

Hi,

MSR index is 32bit not 64bit. All other MSR indexes are defined
without the ULL suffix. Otherwise, you will get

[hjl@...-5 tmp]$ cat foo.c
typedef unsigned long long u64;

int is_disabled(void)
{
 u64 vm_cr;

 do { unsigned long l__,h__; __asm__ __volatile__("rdmsr" : "=a" (l__),
"=d" (h__) : "c" (0xc0010114ULL)); vm_cr = l__; vm_cr |=
((u64)h__<<32); } while(0);
 if (vm_cr & (1 << 4))
  return 1;

 return 0;
}
[hjl@...-5 tmp]$ gcc -m32 -S foo.c
foo.c: In function â_disabledâfoo.c:7: error: impossible register
constraint in âmâoo.c:12: confused by earlier errors, bailing out
[hjl@...-5 tmp]$

on 32bit. This patch removes the ULL suffix in SVM MSR indexes.


H.J.
--- linux-2.6.21.i686/drivers/kvm/svm.h.msr	2007-06-28 22:42:12.000000000 -0700
+++ linux-2.6.21.i686/drivers/kvm/svm.h	2007-06-29 08:03:09.000000000 -0700
@@ -175,8 +175,8 @@ struct __attribute__ ((__packed__)) vmcb
 #define SVM_CPUID_FUNC 0x8000000a
 
 #define MSR_EFER_SVME_MASK (1ULL << 12)
-#define MSR_VM_CR       0xc0010114ULL
-#define MSR_VM_HSAVE_PA 0xc0010117ULL
+#define MSR_VM_CR       0xc0010114
+#define MSR_VM_HSAVE_PA 0xc0010117
 
 #define SVM_VM_CR_SVM_DISABLE 4
 
-
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