linux-kernel - [PATCH 13/16] kvm: vmx: crash_hardware

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Date:	Tue,  4 Nov 2008 12:52:41 -0200
From:	Eduardo Habkost <ehabkost@...hat.com>
To:	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Simon Horman <horms@...ge.net.au>,
	Andrew Morton <akpm@...l.org>, Vivek Goyal <vgoyal@...hat.com>,
	Haren Myneni <hbabu@...ibm.com>,
	Andrey Borzenkov <arvidjaar@...l.ru>, mingo@...hat.com,
	"Rafael J. Wysocki" <rjw@...k.pl>, kexec@...ts.infradead.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Eduardo Habkost <ehabkost@...hat.com>
Subject: [PATCH 13/16] kvm: vmx: crash_hardware_disable function

We need to first check if virtualization was enabled. We do this by
checking CR4.VMXE. If it is set, run vmxoff and clear CR4.VMXE.

Signed-off-by: Eduardo Habkost <ehabkost@...hat.com>
---
 arch/x86/kvm/vmx.c |   16 ++++++++++++++--
 1 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index ece9cb7..0f4e191 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1091,13 +1091,24 @@ static void vmclear_local_vcpus(void)
 		__vcpu_clear(vmx);
 }
 
-static void hardware_disable(void *garbage)
+static void __hardware_disable(void)
 {
-	vmclear_local_vcpus();
 	asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
 	write_cr4(read_cr4() & ~X86_CR4_VMXE);
 }
 
+static void hardware_disable(void *garbage)
+{
+	vmclear_local_vcpus();
+	__hardware_disable();
+}
+
+static void crash_hardware_disable(void *garbage)
+{
+	if (read_cr4() & X86_CR4_VMXE)
+		__hardware_disable();
+}
+
 static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
 				      u32 msr, u32 *result)
 {
@@ -3589,6 +3600,7 @@ static struct kvm_x86_ops vmx_x86_ops = {
 	.check_processor_compatibility = vmx_check_processor_compat,
 	.hardware_enable = hardware_enable,
 	.hardware_disable = hardware_disable,
+	.crash_hardware_disable = crash_hardware_disable,
 	.cpu_has_accelerated_tpr = cpu_has_vmx_virtualize_apic_accesses,
 
 	.vcpu_create = vmx_create_vcpu,
-- 
1.5.5.GIT

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