[PATCH v3 09/11] KVM: arm64: Fast-track kvm_mpidr_to_vcpu() when mpidr_data is available

[Marc Zyngier]

If our fancy little table is present when calling kvm_mpidr_to_vcpu(),
use it to recover the corresponding vcpu.

Reviewed-by: Joey Gouly <joey.gouly at arm.com>
Reviewed-by: Zenghui Yu <yuzenghui at huawei.com>
Tested-by: Joey Gouly <joey.gouly at arm.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi at huawei.com>
Signed-off-by: Marc Zyngier <maz at kernel.org>
---
 arch/arm64/kvm/arm.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index b02e28f76083..e3d667feecaf 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -2388,6 +2388,18 @@ struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
 	unsigned long i;
 
 	mpidr &= MPIDR_HWID_BITMASK;
+
+	if (kvm->arch.mpidr_data) {
+		u16 idx = kvm_mpidr_index(kvm->arch.mpidr_data, mpidr);
+
+		vcpu = kvm_get_vcpu(kvm,
+				    kvm->arch.mpidr_data->cmpidr_to_idx[idx]);
+		if (mpidr != kvm_vcpu_get_mpidr_aff(vcpu))
+			vcpu = NULL;
+
+		return vcpu;
+	}
+
 	kvm_for_each_vcpu(i, vcpu, kvm) {
 		if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
 			return vcpu;
-- 
2.34.1