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[v9,26/84] KVM: x86: add .control_singlestep()

Message ID 20200721210922.7646-27-alazar@bitdefender.com (mailing list archive)
State New, archived
Headers show
Series VM introspection | expand

Commit Message

Adalbert Lazăr July 21, 2020, 9:08 p.m. UTC 
From: Nicușor Cîțu <ncitu@bitdefender.com>

This function is needed for KVMI_VCPU_CONTROL_SINGLESTEP.

Signed-off-by: Nicușor Cîțu <ncitu@bitdefender.com>
Signed-off-by: Adalbert Lazăr <alazar@bitdefender.com>
---
 arch/x86/include/asm/kvm_host.h |  1 +
 arch/x86/kvm/vmx/vmx.c          | 11 +++++++++++
 2 files changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index a905e14e4c75..487d1fa6e76d 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1294,6 +1294,7 @@  struct kvm_x86_ops {
 	u64 (*fault_gla)(struct kvm_vcpu *vcpu);
 	bool (*spt_fault)(struct kvm_vcpu *vcpu);
 	bool (*gpt_translation_fault)(struct kvm_vcpu *vcpu);
+	void (*control_singlestep)(struct kvm_vcpu *vcpu, bool enable);
 };
 
 struct kvm_x86_nested_ops {
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index a043e3e7d09a..4ef4f3c1b78a 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7923,6 +7923,16 @@  static bool vmx_gpt_translation_fault(struct kvm_vcpu *vcpu)
 	return true;
 }
 
+static void vmx_control_singlestep(struct kvm_vcpu *vcpu, bool enable)
+{
+	if (enable)
+		exec_controls_setbit(to_vmx(vcpu),
+			      CPU_BASED_MONITOR_TRAP_FLAG);
+	else
+		exec_controls_clearbit(to_vmx(vcpu),
+				CPU_BASED_MONITOR_TRAP_FLAG);
+}
+
 static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.hardware_unsetup = hardware_unsetup,
 
@@ -8063,6 +8073,7 @@  static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.fault_gla = vmx_fault_gla,
 	.spt_fault = vmx_spt_fault,
 	.gpt_translation_fault = vmx_gpt_translation_fault,
+	.control_singlestep = vmx_control_singlestep,
 };
 
 static __init int hardware_setup(void)