linux-kernel - [PATCH 10/10] Use standard CR8 flags, and fix TPR definition

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Date:	Tue, 17 Jul 2007 23:37:17 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Avi Kivity <avi@...ranet.com>
Cc:	kvm-devel <kvm-devel@...ts.sourceforge.net>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 10/10] Use standard CR8 flags, and fix TPR definition

Intel manual (and KVM definition) say it's TPR is 4 bits wide.  Also fix
CR8_RESEVED_BITS typo.

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>

diff -r 6ef0b4c0d6f7 drivers/kvm/kvm_main.c
--- a/drivers/kvm/kvm_main.c	Tue Jul 17 18:07:48 2007 +1000
+++ b/drivers/kvm/kvm_main.c	Tue Jul 17 18:20:22 2007 +1000
@@ -92,7 +92,7 @@ static struct dentry *debugfs_dir;
 			  | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR	\
 			  | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
 
-#define CR8_RESEVED_BITS (~0x0fULL)
+#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
 
 #ifdef CONFIG_X86_64
@@ -633,7 +633,7 @@ EXPORT_SYMBOL_GPL(set_cr3);
 
 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 {
-	if ( cr8 & CR8_RESEVED_BITS) {
+	if (cr8 & CR8_RESERVED_BITS) {
 		printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
 		inject_gp(vcpu);
 		return;
diff -r 6ef0b4c0d6f7 include/asm-i386/processor-flags.h
--- a/include/asm-i386/processor-flags.h	Tue Jul 17 18:07:48 2007 +1000
+++ b/include/asm-i386/processor-flags.h	Tue Jul 17 18:12:54 2007 +1000
@@ -63,7 +63,7 @@
 /*
  * x86-64 Task Priority Register, CR8
  */
-#define X86_CR8_TPR	0x00000007 /* task priority register */
+#define X86_CR8_TPR	0x0000000F /* task priority register */
 
 /*
  * AMD and Transmeta use MSRs for configuration; see <asm/msr-index.h>


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