[Xen-devel] [PATCH] Disable vPMU feature by default

["Shan, Haitao" <haitao.shan@xxxxxxxxx>]

Hi, Keir,

This little patch will disable vPMU (PMU passthrough to HVM guests) by default. 
If someone is really want to use this feature, he can use "vpmu=1" to turn it 
on manually.

Signed-off-by: Shan Haitao <haitao.shan@xxxxxxxxx>

diff -r 19f0e0867a18 xen/arch/x86/hvm/vmx/vpmu.c
--- a/xen/arch/x86/hvm/vmx/vpmu.c       Mon Nov 02 09:38:34 2009 +0000
+++ b/xen/arch/x86/hvm/vmx/vpmu.c       Mon Nov 02 23:16:29 2009 +0800
@@ -30,6 +30,9 @@
 #include <public/sched.h>
 #include <public/hvm/save.h>
 #include <asm/hvm/vmx/vpmu.h>
+
+static int __read_mostly opt_vpmu_enabled = 0;
+boolean_param("vpmu", opt_vpmu_enabled);
 
 int vpmu_do_wrmsr(struct cpu_user_regs *regs)
 {
@@ -79,6 +82,9 @@ void vpmu_initialise(struct vcpu *v)
 {
     struct vpmu_struct *vpmu = vcpu_vpmu(v);
 
+    if ( !opt_vpmu_enabled )
+        return;
+

Best Regards
Shan Haitao

Attachment: disable_vpmu.patch
Description: disable_vpmu.patch

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