[RFC PATCH 5/5] KVM: arm64: Make sure pinned vmid is released on VM exit
From: Shameer Kolothum <hidden>
Date: 2021-02-22 15:56:20
Also in:
kvmarm, linux-iommu
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
Since the pinned VMID space is not recycled, we need to make sure that we release the vmid back into the pool when we are done with it. Signed-off-by: Shameer Kolothum <redacted> --- arch/arm64/kvm/arm.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 8955968be49f..d9900ffb88f4 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c@@ -181,8 +181,16 @@ void kvm_arch_destroy_vm(struct kvm *kvm) kvm_vgic_destroy(kvm); for (i = 0; i < KVM_MAX_VCPUS; ++i) { - if (kvm->vcpus[i]) { - kvm_vcpu_destroy(kvm->vcpus[i]); + struct kvm_vcpu *vcpu = kvm->vcpus[i]; + + if (vcpu) { + struct kvm_vmid *vmid = &vcpu->arch.hw_mmu->vmid; + + if (refcount_read(&vmid->pinned)) { + ida_free(&kvm_pinned_vmids, vmid->vmid); + refcount_set(&vmid->pinned, 0); + } + kvm_vcpu_destroy(vcpu); kvm->vcpus[i] = NULL; } }
--
2.17.1
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