linux-kernel - [PATCH] kvm-intel: Auto-load on CPUs with VMX.

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Message-ID: <20120321063350.GA3468@leaf>
Date:	Tue, 20 Mar 2012 23:33:51 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] kvm-intel: Auto-load on CPUs with VMX.

Enable x86 feature-based autoloading for the kvm-intel module on CPUs
with X86_FEATURE_VMX.

Signed-off-by: Josh Triplett <josh@...htriplett.org>
---

I've tested this and it works correctly.  I can also supply the obvious
equivalent patch for kvm-amd on AMD CPUs with SVM, but I don't have any
such CPUs to test that on.

 arch/x86/kvm/vmx.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 3b4c8d8..bb3bcff 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -27,6 +27,7 @@
 #include <linux/highmem.h>
 #include <linux/sched.h>
 #include <linux/moduleparam.h>
+#include <linux/mod_devicetable.h>
 #include <linux/ftrace_event.h>
 #include <linux/slab.h>
 #include <linux/tboot.h>
@@ -51,6 +52,12 @@
 MODULE_AUTHOR("Qumranet");
 MODULE_LICENSE("GPL");
 
+static const struct x86_cpu_id vmx_cpu_id[] = {
+	X86_FEATURE_MATCH(X86_FEATURE_VMX),
+	{}
+};
+MODULE_DEVICE_TABLE(x86cpu, vmx_cpu_id);
+
 static bool __read_mostly enable_vpid = 1;
 module_param_named(vpid, enable_vpid, bool, 0444);
 
-- 
1.7.9.1

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