[PATCH v17 04/20] KVM: arm64: Refactor the vcpu_load to allow for VM specific callbacks

[Suzuki K Poulose <suzuki.poulose@arm.com>]

Based on a work by Marc Zyngier

To keep the VCPU load/put handling cleaner with the different kinds of VM types,
we are about to introduce VM specific callbacks to do just the right thing.
In preparation for that, make some refactoring to add the change easier.

No functional changes intended.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 arch/arm64/kvm/arm.c | 46 +++++++++++++++++++++++++++-----------------
 1 file changed, 28 insertions(+), 18 deletions(-)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 67f1ff9bc4fbe..51fc651267157 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -683,14 +683,11 @@ static bool kvm_vcpu_should_clear_twe(struct kvm_vcpu *vcpu)
 	return single_task_running();
 }
 
-void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+static void vcpu_prepare_mmu(struct kvm_vcpu *vcpu)
 {
 	struct kvm_s2_mmu *mmu;
 	int *last_ran;
 
-	if (is_protected_kvm_enabled())
-		goto nommu;
-
 	if (vcpu_has_nv(vcpu))
 		kvm_vcpu_load_hw_mmu(vcpu);
 
@@ -720,10 +717,33 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 		kvm_call_hyp(__kvm_flush_cpu_context, mmu);
 		*last_ran = vcpu->vcpu_idx;
 	}
+}
+
+static void vcpu_set_wfx_traps(struct kvm_vcpu *vcpu)
+{
+	if (kvm_vcpu_should_clear_twe(vcpu))
+		vcpu->arch.hcr_el2 &= ~HCR_TWE;
+	else
+		vcpu->arch.hcr_el2 |= HCR_TWE;
+
+	if (kvm_vcpu_should_clear_twi(vcpu))
+		vcpu->arch.hcr_el2 &= ~HCR_TWI;
+	else
+		vcpu->arch.hcr_el2 |= HCR_TWI;
+}
+
+static void vcpu_load_pvtime(struct kvm_vcpu *vcpu)
+{
+	if (kvm_arm_is_pvtime_enabled(&vcpu->arch))
+		kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu);
+}
+
+void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+	if (!is_protected_kvm_enabled())
+		vcpu_prepare_mmu(vcpu);
 
-nommu:
 	vcpu->cpu = cpu;
-
 	/*
 	 * The timer must be loaded before the vgic to correctly set up physical
 	 * interrupt deactivation in nested state (e.g. timer interrupt).
@@ -736,19 +756,9 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 		kvm_vcpu_load_vhe(vcpu);
 	kvm_arch_vcpu_load_fp(vcpu);
 	kvm_vcpu_pmu_restore_guest(vcpu);
-	if (kvm_arm_is_pvtime_enabled(&vcpu->arch))
-		kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu);
-
-	if (kvm_vcpu_should_clear_twe(vcpu))
-		vcpu->arch.hcr_el2 &= ~HCR_TWE;
-	else
-		vcpu->arch.hcr_el2 |= HCR_TWE;
-
-	if (kvm_vcpu_should_clear_twi(vcpu))
-		vcpu->arch.hcr_el2 &= ~HCR_TWI;
-	else
-		vcpu->arch.hcr_el2 |= HCR_TWI;
 
+	vcpu_load_pvtime(vcpu);
+	vcpu_set_wfx_traps(vcpu);
 	vcpu_set_pauth_traps(vcpu);
 
 	if (is_protected_kvm_enabled()) {
-- 
2.43.0