[PATCH] MSR related clean up

[Sheng Yang <sheng@linux.intel.com>]

rdmsr_safe() is used to access MSR unknown to Xen, and is not safe... I think
it is legacy.

Also let msr_write be parity with msr_read on MSR_IA32_MISC_ENABLE.

CC: Eddie Dong <eddie.dong@intel.com>
Signed-off-by: Sheng Yang <sheng@linux.intel.com>

diff -r c30742011bb8 -r 64dc4510484e xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c	Thu Mar 12 18:48:09 2009 +0000
+++ b/xen/arch/x86/hvm/vmx/vmx.c	Thu Jun 18 17:10:22 2009 +0800
@@ -1836,8 +1836,7 @@
         }
 
         if ( rdmsr_viridian_regs(ecx, &eax, &edx) ||
-             rdmsr_hypervisor_regs(ecx, &eax, &edx) ||
-             rdmsr_safe(ecx, eax, edx) == 0 )
+             rdmsr_hypervisor_regs(ecx, &eax, &edx) )
         {
             regs->eax = eax;
             regs->edx = edx;
@@ -2008,6 +2007,9 @@
     }
     case MSR_IA32_VMX_BASIC...MSR_IA32_VMX_PROCBASED_CTLS2:
         goto gp_fault;
+    /* Ignore writing to these MSRs */
+    case MSR_IA32_MISC_ENABLE:
+        break;
     default:
         if ( vpmu_do_wrmsr(regs) )
             return X86EMUL_OKAY;