[RFC PATCH v1 03/34] KVM: x86: add kvm_get_ept_view()

[Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>]

From: Ștefan Șicleru <ssicleru@xxxxxxxxxxxxxxx>

This function returns the EPT view of the current vCPU
or 0 if the hardware support is missing.

Signed-off-by: Ștefan Șicleru <ssicleru@xxxxxxxxxxxxxxx>
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
 arch/x86/include/asm/kvm_host.h |  3 +++
 arch/x86/kvm/vmx/vmx.c          |  8 ++++++++
 arch/x86/kvm/vmx/vmx.h          |  3 +++
 arch/x86/kvm/x86.c              | 10 ++++++++++
 4 files changed, 24 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 5eb26135e81b..0acc21087caf 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1302,6 +1302,7 @@ struct kvm_x86_ops {
 	void (*control_singlestep)(struct kvm_vcpu *vcpu, bool enable);
 	bool (*get_vmfunc_status)(void);
 	bool (*get_eptp_switching_status)(void);
+	u16 (*get_ept_view)(struct kvm_vcpu *vcpu);
 };
 
 struct kvm_x86_nested_ops {
@@ -1773,4 +1774,6 @@ static inline int kvm_cpu_get_apicid(int mps_cpu)
 #define GET_SMSTATE(type, buf, offset)		\
 	(*(type *)((buf) + (offset) - 0x7e00))
 
+u16 kvm_get_ept_view(struct kvm_vcpu *vcpu);
+
 #endif /* _ASM_X86_KVM_HOST_H */
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index ccbf561b0fc4..0256c3a93c87 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -8002,6 +8002,13 @@ static bool vmx_get_eptp_switching_status(void)
 	return kvm_eptp_switching_supported;
 }
 
+static u16 vmx_get_ept_view(struct kvm_vcpu *vcpu)
+{
+	const struct vcpu_vmx *vmx = to_vmx(vcpu);
+
+	return vmx->view;
+}
+
 static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.hardware_unsetup = hardware_unsetup,
 
@@ -8145,6 +8152,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.control_singlestep = vmx_control_singlestep,
 	.get_vmfunc_status = vmx_get_vmfunc_status,
 	.get_eptp_switching_status = vmx_get_eptp_switching_status,
+	.get_ept_view = vmx_get_ept_view,
 };
 
 static __init int hardware_setup(void)
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index aa0c7ffd588b..14f0b9102d58 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -296,6 +296,9 @@ struct vcpu_vmx {
 	u64 ept_pointer;
 
 	struct pt_desc pt_desc;
+
+	/* The view this vcpu operates on. */
+	u16 view;
 };
 
 enum ept_pointers_status {
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b16b018c74cc..2e2c56a37bdb 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10869,6 +10869,16 @@ u64 kvm_spec_ctrl_valid_bits(struct kvm_vcpu *vcpu)
 }
 EXPORT_SYMBOL_GPL(kvm_spec_ctrl_valid_bits);
 
+u16 kvm_get_ept_view(struct kvm_vcpu *vcpu)
+{
+	if (!kvm_x86_ops.get_ept_view)
+		return 0;
+
+	return kvm_x86_ops.get_ept_view(vcpu);
+}
+EXPORT_SYMBOL_GPL(kvm_get_ept_view);
+
+
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_fast_mmio);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);