linux-kernel - [PATCH] KVM: AMD SVM: Avoid three more new instructions

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Message-Id: <20061128131345.2356525015E@cleopatra.q>
Date:	Tue, 28 Nov 2006 13:13:45 -0000
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, mingo@...e.hu
Subject: [PATCH] KVM: AMD SVM: Avoid three more new instructions

The clgi, stgi, and invlpga instructions are all too new to unleash on
the world's assemblers.  Replace them with the opcode sequences.

Signed-off-by: Avi Kivity <avi@...ranet.com>

diff -X /home/avi/kvm/linux-2.6/Documentation/dontdiff --exclude=Makefile -ru /home/avi/kvm/linux-2.6/drivers/kvm/svm.c /home/avi/kvm-release/kernel/svm.c
--- linux-2.6/drivers/kvm/svm.c	2006-11-28 14:31:03.000000000 +0200
+++ linux-2.6/drivers/kvm/svm.c	2006-11-28 15:08:19.000000000 +0200
@@ -102,17 +102,17 @@
 
 static inline void clgi(void)
 {
-	asm volatile ("clgi");
+	asm volatile (SVM_CLGI);
 }
 
 static inline void stgi(void)
 {
-	asm volatile ("stgi");
+	asm volatile (SVM_STGI);
 }
 
 static inline void invlpga(unsigned long addr, u32 asid)
 {
-	asm volatile ("invlpga" :: "a"(addr), "c"(asid));
+	asm volatile (SVM_INVLPGA :: "a"(addr), "c"(asid));
 }
 
 static inline unsigned long read_cr2(void)
diff -X /home/avi/kvm/linux-2.6/Documentation/dontdiff --exclude=Makefile -ru /home/avi/kvm/linux-2.6/drivers/kvm/svm.h /home/avi/kvm-release/kernel/svm.h
--- linux-2.6/drivers/kvm/svm.h	2006-11-28 14:14:17.000000000 +0200
+++ linux-2.6/drivers/kvm/svm.h	2006-11-28 15:09:17.000000000 +0200
@@ -307,6 +307,9 @@
 #define SVM_VMLOAD ".byte 0x0f, 0x01, 0xda"
 #define SVM_VMRUN  ".byte 0x0f, 0x01, 0xd8"
 #define SVM_VMSAVE ".byte 0x0f, 0x01, 0xdb"
+#define SVM_CLGI   ".byte 0x0f, 0x01, 0xdd"
+#define SVM_STGI   ".byte 0x0f, 0x01, 0xdc"
+#define SVM_INVLPGA ".byte 0x0f, 0x01, 0xdf"
 
 #endif
 
-
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