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Subject[PATCH 13/16] kvm: vmx: crash_hardware_disable function
Date
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@redhat.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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