[RFC PATCH v7 25/78] KVM: x86: add .control_singlestep()

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From: Nicușor Cîțu <ncitu@xxxxxxxxxxxxxxx>

This function is needed for KVMI_VCPU_CONTROL_SINGLESTEP
and KVMI_EVENT_SINGLESTEP.

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

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index e05569a5da10..6927a6044e26 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1257,6 +1257,7 @@ 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_arch_async_pf {
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 83f047fe6bc1..475f5eb6c4c2 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7837,6 +7837,16 @@ 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 __ro_after_init = {
 	.cpu_has_kvm_support = cpu_has_kvm_support,
 	.disabled_by_bios = vmx_disabled_by_bios,
@@ -7998,6 +8008,7 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
 	.fault_gla = vmx_fault_gla,
 	.spt_fault = vmx_spt_fault,
 	.gpt_translation_fault = vmx_gpt_translation_fault,
+	.control_singlestep = vmx_control_singlestep,
 };
 
 static void vmx_cleanup_l1d_flush(void)
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