[RFC PATCH v2 3/7] KVM: arm64: Add interfaces for pinned VMID support

[Shameer Kolothum]

Provide interfaces to get/put pinned VMIDs from KVM VMID allocator.
This will be used by SMMUv3 driver in subsequent patch.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi at huawei.com>
---
 arch/arm64/kvm/Kconfig |  1 +
 arch/arm64/kvm/arm.c   | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index 6c3c8ca73e7f..29ff79f112ba 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -40,6 +40,7 @@ menuconfig KVM
 	select SCHED_INFO
 	select GUEST_PERF_EVENTS if PERF_EVENTS
 	select XARRAY_MULTI
+	select HAVE_KVM_PINNED_VMID
 	help
 	  Support hosting virtualized guest machines.
 
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index a25265aca432..ed905da6e9ab 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -711,6 +711,20 @@ int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu)
 	return ret;
 }
 
+int kvm_arch_pinned_vmid_get(struct kvm *kvm)
+{
+	int vmid;
+
+	vmid = kvm_arm_pinned_vmid_get(&kvm->arch.mmu.vmid);
+
+	return (vmid == 0) ? -EINVAL : vmid;
+}
+
+void kvm_arch_pinned_vmid_put(struct kvm *kvm)
+{
+	kvm_arm_pinned_vmid_put(&kvm->arch.mmu.vmid);
+}
+
 bool kvm_arch_intc_initialized(struct kvm *kvm)
 {
 	return vgic_initialized(kvm);
-- 
2.34.1