KVM: arm/arm64: vgic-new: vgic_init: implement vgic_create
This patch implements the vgic_creation function which is called on CREATE_IRQCHIP VM IOCTL (v2 only) or KVM_CREATE_DEVICE Signed-off-by: Eric Auger <eric.auger@linaro.org> Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
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@ -195,6 +195,7 @@ struct vgic_cpu {
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};
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};
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int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
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int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
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int kvm_vgic_create(struct kvm *kvm, u32 type);
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int kvm_vgic_hyp_init(void);
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int kvm_vgic_hyp_init(void);
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int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
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int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
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@ -22,6 +22,90 @@
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#include <asm/kvm_mmu.h>
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#include <asm/kvm_mmu.h>
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#include "vgic.h"
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#include "vgic.h"
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/* CREATION */
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/**
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* kvm_vgic_create: triggered by the instantiation of the VGIC device by
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* user space, either through the legacy KVM_CREATE_IRQCHIP ioctl (v2 only)
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* or through the generic KVM_CREATE_DEVICE API ioctl.
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* irqchip_in_kernel() tells you if this function succeeded or not.
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*/
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int kvm_vgic_create(struct kvm *kvm, u32 type)
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{
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int i, vcpu_lock_idx = -1, ret;
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struct kvm_vcpu *vcpu;
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mutex_lock(&kvm->lock);
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if (irqchip_in_kernel(kvm)) {
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ret = -EEXIST;
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goto out;
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}
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/*
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* This function is also called by the KVM_CREATE_IRQCHIP handler,
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* which had no chance yet to check the availability of the GICv2
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* emulation. So check this here again. KVM_CREATE_DEVICE does
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* the proper checks already.
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*/
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if (type == KVM_DEV_TYPE_ARM_VGIC_V2 &&
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!kvm_vgic_global_state.can_emulate_gicv2) {
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ret = -ENODEV;
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goto out;
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}
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/*
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* Any time a vcpu is run, vcpu_load is called which tries to grab the
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* vcpu->mutex. By grabbing the vcpu->mutex of all VCPUs we ensure
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* that no other VCPUs are run while we create the vgic.
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*/
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ret = -EBUSY;
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kvm_for_each_vcpu(i, vcpu, kvm) {
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if (!mutex_trylock(&vcpu->mutex))
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goto out_unlock;
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vcpu_lock_idx = i;
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}
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kvm_for_each_vcpu(i, vcpu, kvm) {
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if (vcpu->arch.has_run_once)
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goto out_unlock;
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}
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ret = 0;
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if (type == KVM_DEV_TYPE_ARM_VGIC_V2)
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kvm->arch.max_vcpus = VGIC_V2_MAX_CPUS;
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else
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kvm->arch.max_vcpus = VGIC_V3_MAX_CPUS;
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if (atomic_read(&kvm->online_vcpus) > kvm->arch.max_vcpus) {
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ret = -E2BIG;
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goto out_unlock;
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}
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kvm->arch.vgic.in_kernel = true;
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kvm->arch.vgic.vgic_model = type;
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/*
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* kvm_vgic_global_state.vctrl_base is set on vgic probe (kvm_arch_init)
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* it is stored in distributor struct for asm save/restore purpose
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*/
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kvm->arch.vgic.vctrl_base = kvm_vgic_global_state.vctrl_base;
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kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF;
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kvm->arch.vgic.vgic_cpu_base = VGIC_ADDR_UNDEF;
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kvm->arch.vgic.vgic_redist_base = VGIC_ADDR_UNDEF;
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out_unlock:
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for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) {
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vcpu = kvm_get_vcpu(kvm, vcpu_lock_idx);
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mutex_unlock(&vcpu->mutex);
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}
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out:
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mutex_unlock(&kvm->lock);
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return ret;
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}
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/* GENERIC PROBE */
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/* GENERIC PROBE */
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static void vgic_init_maintenance_interrupt(void *info)
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static void vgic_init_maintenance_interrupt(void *info)
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