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

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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@arm.com>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Tested-by: Joey Gouly <joey.gouly@arm.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230927090911.3355209-10-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Marc Zyngier 2023-09-27 10:09:09 +01:00 • committed by Oliver Upton
parent 5544750efd
commit 54a8006d0b
1 changed files with 12 additions and 0 deletions
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12
arch/arm64/kvm/arm.c
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@ -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;