[RFC PATCH v2 26/38] KVM: arm64: Add macros to support the virtual EL2 with VHE

Jintack Lim
2017-07-18T16:58:52Z

These macros will be used to support the virtual EL2 with VHE.

Signed-off-by: Jintack Lim <jintack.lim@linaro.org>
---
arch/arm64/include/asm/kvm_emulate.h | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 3017234..68aafbd 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -173,6 +173,30 @@ static inline bool vcpu_mode_el2(const struct kvm_vcpu *vcpu)
return mode == PSR_MODE_EL2h || mode == PSR_MODE_EL2t;
}

+static inline bool vcpu_el2_e2h_is_set(const struct kvm_vcpu *vcpu)
+{
+ return (vcpu_sys_reg(vcpu, HCR_EL2) & HCR_E2H);
+}
+
+static inline bool vcpu_el2_tge_is_set(const struct kvm_vcpu *vcpu)
+{
+ return (vcpu_sys_reg(vcpu, HCR_EL2) & HCR_TGE);
+}
+
+static inline bool is_hyp_ctxt(const struct kvm_vcpu *vcpu)
+{
+ /*
+ * We are in a hypervisor context if the vcpu mode is EL2 or
+ * E2H and TGE bits are set. The latter means we are in the user space
+ * of the VHE kernel. ARMv8.1 ARM describes this as 'InHost'
+ */
+ if (vcpu_mode_el2(vcpu) ||
+ (vcpu_el2_e2h_is_set(vcpu) && vcpu_el2_tge_is_set(vcpu)))
+ return true;
+
+ return false;
+}
+
static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu)
{
return vcpu->arch.fault.esr_el2;
--
1.9.1