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Message-Id: <1228854179-23002-24-git-send-email-avi@redhat.com>
Date: Tue, 9 Dec 2008 22:22:38 +0200
From: Avi Kivity <avi@...hat.com>
To: kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Eduardo Habkost <ehabkost@...hat.com>
Subject: [PATCH 23/44] x86: cpu_emergency_vmxoff() function
From: Eduardo Habkost <ehabkost@...hat.com>
Add cpu_emergency_vmxoff() and its friends: cpu_vmx_enabled() and
__cpu_emergency_vmxoff().
Signed-off-by: Eduardo Habkost <ehabkost@...hat.com>
Signed-off-by: Avi Kivity <avi@...hat.com>
---
arch/x86/include/asm/virtext.h | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h
index 7dee5b5..6bcf0ac 100644
--- a/arch/x86/include/asm/virtext.h
+++ b/arch/x86/include/asm/virtext.h
@@ -43,4 +43,27 @@ static inline void cpu_vmxoff(void)
write_cr4(read_cr4() & ~X86_CR4_VMXE);
}
+static inline int cpu_vmx_enabled(void)
+{
+ return read_cr4() & X86_CR4_VMXE;
+}
+
+/** Disable VMX if it is enabled on the current CPU
+ *
+ * You shouldn't call this if cpu_has_vmx() returns 0.
+ */
+static inline void __cpu_emergency_vmxoff(void)
+{
+ if (cpu_vmx_enabled())
+ cpu_vmxoff();
+}
+
+/** Disable VMX if it is supported and enabled on the current CPU
+ */
+static inline void cpu_emergency_vmxoff(void)
+{
+ if (cpu_has_vmx())
+ __cpu_emergency_vmxoff();
+}
+
#endif /* _ASM_X86_VIRTEX_H */
--
1.6.0.3
--
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