Commit 54a8006d authored by Marc Zyngier's avatar Marc Zyngier Committed by Oliver Upton
Browse files

KVM: arm64: Fast-track kvm_mpidr_to_vcpu() when mpidr_data is available 



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

Reviewed-by: default avatarJoey Gouly <joey.gouly@arm.com>
Reviewed-by: default avatarZenghui Yu <yuzenghui@huawei.com>
Tested-by: default avatarJoey Gouly <joey.gouly@arm.com>
Tested-by: default avatarShameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230927090911.3355209-10-maz@kernel.org


Signed-off-by: default avatarOliver Upton <oliver.upton@linux.dev>
parent 5544750e

arch/arm64/kvm/arm.c

+12 −0
Original line number Diff line number Diff line
@@ -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;