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kvm/ppc/mpic: add KVM_CAP_IRQ_MPIC
Enabling this capability connects the vcpu to the designated in-kernel MPIC. Using explicit connections between vcpus and irqchips allows for flexibility, but the main benefit at the moment is that it simplifies the code -- KVM doesn't need vm-global state to remember which MPIC object is associated with this vm, and it doesn't need to care about ordering between irqchip creation and vcpu creation. Signed-off-by: Scott Wood <scottwood@freescale.com> [agraf: add stub functions for kvmppc_mpic_{dis,}connect_vcpu] Signed-off-by: Alexander Graf <agraf@suse.de>
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@ -2744,3 +2744,11 @@ to receive the topmost interrupt vector.
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When disabled (args[0] == 0), behavior is as if this facility is unsupported.
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When this capability is enabled, KVM_EXIT_EPR can occur.
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6.6 KVM_CAP_IRQ_MPIC
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Architectures: ppc
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Parameters: args[0] is the MPIC device fd
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args[1] is the MPIC CPU number for this vcpu
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This capability connects the vcpu to an in-kernel MPIC device.
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@ -377,6 +377,11 @@ struct kvmppc_booke_debug_reg {
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u64 dac[KVMPPC_BOOKE_MAX_DAC];
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};
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#define KVMPPC_IRQ_DEFAULT 0
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#define KVMPPC_IRQ_MPIC 1
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struct openpic;
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struct kvm_vcpu_arch {
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ulong host_stack;
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u32 host_pid;
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@ -558,6 +563,10 @@ struct kvm_vcpu_arch {
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unsigned long magic_page_pa; /* phys addr to map the magic page to */
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unsigned long magic_page_ea; /* effect. addr to map the magic page to */
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int irq_type; /* one of KVM_IRQ_* */
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int irq_cpu_id;
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struct openpic *mpic; /* KVM_IRQ_MPIC */
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#ifdef CONFIG_KVM_BOOK3S_64_HV
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struct kvm_vcpu_arch_shared shregs;
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@ -248,7 +248,6 @@ int kvmppc_set_one_reg(struct kvm_vcpu *vcpu, u64 id, union kvmppc_one_reg *);
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void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid);
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struct openpic;
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void kvmppc_mpic_put(struct openpic *opp);
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#ifdef CONFIG_KVM_BOOK3S_64_HV
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static inline void kvmppc_set_xics_phys(int cpu, unsigned long addr)
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@ -278,6 +277,9 @@ static inline void kvmppc_set_epr(struct kvm_vcpu *vcpu, u32 epr)
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#ifdef CONFIG_KVM_MPIC
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void kvmppc_mpic_set_epr(struct kvm_vcpu *vcpu);
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int kvmppc_mpic_connect_vcpu(struct kvm_device *dev, struct kvm_vcpu *vcpu,
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u32 cpu);
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void kvmppc_mpic_disconnect_vcpu(struct openpic *opp, struct kvm_vcpu *vcpu);
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#else
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@ -285,6 +287,17 @@ static inline void kvmppc_mpic_set_epr(struct kvm_vcpu *vcpu)
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{
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}
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static inline int kvmppc_mpic_connect_vcpu(struct kvm_device *dev,
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struct kvm_vcpu *vcpu, u32 cpu)
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{
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return -EINVAL;
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}
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static inline void kvmppc_mpic_disconnect_vcpu(struct openpic *opp,
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struct kvm_vcpu *vcpu)
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{
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}
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#endif /* CONFIG_KVM_MPIC */
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int kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu *vcpu,
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@ -430,6 +430,10 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,
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if (update_epr == true) {
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if (vcpu->arch.epr_flags & KVMPPC_EPR_USER)
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kvm_make_request(KVM_REQ_EPR_EXIT, vcpu);
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else if (vcpu->arch.epr_flags & KVMPPC_EPR_KERNEL) {
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BUG_ON(vcpu->arch.irq_type != KVMPPC_IRQ_MPIC);
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kvmppc_mpic_set_epr(vcpu);
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}
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}
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new_msr &= msr_mask;
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@ -115,7 +115,7 @@ static int get_current_cpu(void)
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{
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#if defined(CONFIG_KVM) && defined(CONFIG_BOOKE)
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struct kvm_vcpu *vcpu = current->thread.kvm_vcpu;
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return vcpu ? vcpu->vcpu_id : -1;
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return vcpu ? vcpu->arch.irq_cpu_id : -1;
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#else
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/* XXX */
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return -1;
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@ -249,7 +249,7 @@ static void mpic_irq_raise(struct openpic *opp, struct irq_dest *dst,
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return;
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}
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pr_debug("%s: cpu %d output %d\n", __func__, dst->vcpu->vcpu_id,
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pr_debug("%s: cpu %d output %d\n", __func__, dst->vcpu->arch.irq_cpu_id,
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output);
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if (output != ILR_INTTGT_INT) /* TODO */
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@ -267,7 +267,7 @@ static void mpic_irq_lower(struct openpic *opp, struct irq_dest *dst,
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return;
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}
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pr_debug("%s: cpu %d output %d\n", __func__, dst->vcpu->vcpu_id,
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pr_debug("%s: cpu %d output %d\n", __func__, dst->vcpu->arch.irq_cpu_id,
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output);
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if (output != ILR_INTTGT_INT) /* TODO */
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@ -1165,6 +1165,20 @@ static uint32_t openpic_iack(struct openpic *opp, struct irq_dest *dst,
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return retval;
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}
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void kvmppc_mpic_set_epr(struct kvm_vcpu *vcpu)
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{
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struct openpic *opp = vcpu->arch.mpic;
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int cpu = vcpu->arch.irq_cpu_id;
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unsigned long flags;
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spin_lock_irqsave(&opp->lock, flags);
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if ((opp->gcr & opp->mpic_mode_mask) == GCR_MODE_PROXY)
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kvmppc_set_epr(vcpu, openpic_iack(opp, &opp->dst[cpu], cpu));
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spin_unlock_irqrestore(&opp->lock, flags);
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}
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static int openpic_cpu_read_internal(void *opaque, gpa_t addr,
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u32 *ptr, int idx)
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{
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@ -1431,10 +1445,10 @@ static void map_mmio(struct openpic *opp)
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static void unmap_mmio(struct openpic *opp)
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{
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BUG_ON(opp->mmio_mapped);
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opp->mmio_mapped = false;
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kvm_io_bus_unregister_dev(opp->kvm, KVM_MMIO_BUS, &opp->mmio);
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if (opp->mmio_mapped) {
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opp->mmio_mapped = false;
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kvm_io_bus_unregister_dev(opp->kvm, KVM_MMIO_BUS, &opp->mmio);
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}
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}
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static int set_base_addr(struct openpic *opp, struct kvm_device_attr *attr)
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@ -1693,3 +1707,57 @@ struct kvm_device_ops kvm_mpic_ops = {
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.get_attr = mpic_get_attr,
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.has_attr = mpic_has_attr,
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};
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int kvmppc_mpic_connect_vcpu(struct kvm_device *dev, struct kvm_vcpu *vcpu,
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u32 cpu)
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{
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struct openpic *opp = dev->private;
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int ret = 0;
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if (dev->ops != &kvm_mpic_ops)
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return -EPERM;
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if (opp->kvm != vcpu->kvm)
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return -EPERM;
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if (cpu < 0 || cpu >= MAX_CPU)
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return -EPERM;
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spin_lock_irq(&opp->lock);
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if (opp->dst[cpu].vcpu) {
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ret = -EEXIST;
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goto out;
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}
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if (vcpu->arch.irq_type) {
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ret = -EBUSY;
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goto out;
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}
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opp->dst[cpu].vcpu = vcpu;
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opp->nb_cpus = max(opp->nb_cpus, cpu + 1);
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vcpu->arch.mpic = opp;
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vcpu->arch.irq_cpu_id = cpu;
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vcpu->arch.irq_type = KVMPPC_IRQ_MPIC;
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/* This might need to be changed if GCR gets extended */
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if (opp->mpic_mode_mask == GCR_MODE_PROXY)
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vcpu->arch.epr_flags |= KVMPPC_EPR_KERNEL;
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kvm_device_get(dev);
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out:
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spin_unlock_irq(&opp->lock);
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return ret;
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}
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/*
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* This should only happen immediately before the mpic is destroyed,
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* so we shouldn't need to worry about anything still trying to
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* access the vcpu pointer.
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*/
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void kvmppc_mpic_disconnect_vcpu(struct openpic *opp, struct kvm_vcpu *vcpu)
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{
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BUG_ON(!opp->dst[vcpu->arch.irq_cpu_id].vcpu);
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opp->dst[vcpu->arch.irq_cpu_id].vcpu = NULL;
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kvm_device_put(opp->dev);
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}
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@ -25,6 +25,7 @@
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#include <linux/hrtimer.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/file.h>
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#include <asm/cputable.h>
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#include <asm/uaccess.h>
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#include <asm/kvm_ppc.h>
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@ -326,6 +327,9 @@ int kvm_dev_ioctl_check_extension(long ext)
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case KVM_CAP_PPC_GET_PVINFO:
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#if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
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case KVM_CAP_SW_TLB:
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#endif
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#ifdef CONFIG_KVM_MPIC
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case KVM_CAP_IRQ_MPIC:
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#endif
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r = 1;
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break;
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@ -460,6 +464,13 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
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tasklet_kill(&vcpu->arch.tasklet);
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kvmppc_remove_vcpu_debugfs(vcpu);
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switch (vcpu->arch.irq_type) {
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case KVMPPC_IRQ_MPIC:
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kvmppc_mpic_disconnect_vcpu(vcpu->arch.mpic, vcpu);
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break;
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}
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kvmppc_core_vcpu_free(vcpu);
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}
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@ -786,6 +797,25 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
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r = kvm_vcpu_ioctl_config_tlb(vcpu, &cfg);
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break;
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}
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#endif
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#ifdef CONFIG_KVM_MPIC
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case KVM_CAP_IRQ_MPIC: {
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struct file *filp;
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struct kvm_device *dev;
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r = -EBADF;
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filp = fget(cap->args[0]);
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if (!filp)
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break;
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r = -EPERM;
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dev = kvm_device_from_filp(filp);
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if (dev)
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r = kvmppc_mpic_connect_vcpu(dev, vcpu, cap->args[1]);
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fput(filp);
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break;
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}
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#endif
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default:
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r = -EINVAL;
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@ -667,6 +667,7 @@ struct kvm_ppc_smmu_info {
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#define KVM_CAP_ARM_PSCI 87
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#define KVM_CAP_ARM_SET_DEVICE_ADDR 88
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#define KVM_CAP_DEVICE_CTRL 89
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#define KVM_CAP_IRQ_MPIC 90
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#ifdef KVM_CAP_IRQ_ROUTING
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