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@@ -1,7 +1,7 @@
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/*
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* handling kvm guest interrupts
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*
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- * Copyright IBM Corp. 2008
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+ * Copyright IBM Corp. 2008,2014
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (version 2 only)
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@@ -13,6 +13,7 @@
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#include <linux/interrupt.h>
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#include <linux/kvm_host.h>
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#include <linux/hrtimer.h>
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+#include <linux/mmu_context.h>
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#include <linux/signal.h>
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#include <linux/slab.h>
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#include <asm/asm-offsets.h>
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@@ -1054,6 +1055,171 @@ static int enqueue_floating_irq(struct kvm_device *dev,
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return r;
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}
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+static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
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+{
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+ if (id >= MAX_S390_IO_ADAPTERS)
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+ return NULL;
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+ return kvm->arch.adapters[id];
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+}
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+
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+static int register_io_adapter(struct kvm_device *dev,
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+ struct kvm_device_attr *attr)
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+{
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+ struct s390_io_adapter *adapter;
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+ struct kvm_s390_io_adapter adapter_info;
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+
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+ if (copy_from_user(&adapter_info,
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+ (void __user *)attr->addr, sizeof(adapter_info)))
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+ return -EFAULT;
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+
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+ if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
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+ (dev->kvm->arch.adapters[adapter_info.id] != NULL))
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+ return -EINVAL;
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+
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+ adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
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+ if (!adapter)
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+ return -ENOMEM;
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+
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+ INIT_LIST_HEAD(&adapter->maps);
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+ init_rwsem(&adapter->maps_lock);
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+ atomic_set(&adapter->nr_maps, 0);
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+ adapter->id = adapter_info.id;
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+ adapter->isc = adapter_info.isc;
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+ adapter->maskable = adapter_info.maskable;
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+ adapter->masked = false;
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+ adapter->swap = adapter_info.swap;
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+ dev->kvm->arch.adapters[adapter->id] = adapter;
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+
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+ return 0;
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+}
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+
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+int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
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+{
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+ int ret;
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+ struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
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+
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+ if (!adapter || !adapter->maskable)
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+ return -EINVAL;
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+ ret = adapter->masked;
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+ adapter->masked = masked;
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+ return ret;
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+}
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+
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+static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
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+{
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+ struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
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+ struct s390_map_info *map;
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+ int ret;
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+
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+ if (!adapter || !addr)
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+ return -EINVAL;
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+
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+ map = kzalloc(sizeof(*map), GFP_KERNEL);
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+ if (!map) {
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+ ret = -ENOMEM;
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+ goto out;
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+ }
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+ INIT_LIST_HEAD(&map->list);
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+ map->guest_addr = addr;
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+ map->addr = gmap_translate(addr, kvm->arch.gmap);
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+ if (map->addr == -EFAULT) {
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+ ret = -EFAULT;
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+ goto out;
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+ }
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+ ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
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+ if (ret < 0)
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+ goto out;
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+ BUG_ON(ret != 1);
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+ down_write(&adapter->maps_lock);
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+ if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
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+ list_add_tail(&map->list, &adapter->maps);
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+ ret = 0;
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+ } else {
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+ put_page(map->page);
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+ ret = -EINVAL;
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+ }
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+ up_write(&adapter->maps_lock);
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+out:
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+ if (ret)
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+ kfree(map);
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+ return ret;
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+}
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+
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+static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
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+{
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+ struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
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+ struct s390_map_info *map, *tmp;
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+ int found = 0;
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+
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+ if (!adapter || !addr)
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+ return -EINVAL;
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+
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+ down_write(&adapter->maps_lock);
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+ list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
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+ if (map->guest_addr == addr) {
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+ found = 1;
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+ atomic_dec(&adapter->nr_maps);
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+ list_del(&map->list);
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+ put_page(map->page);
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+ kfree(map);
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+ break;
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+ }
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+ }
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+ up_write(&adapter->maps_lock);
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+
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+ return found ? 0 : -EINVAL;
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+}
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+
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+void kvm_s390_destroy_adapters(struct kvm *kvm)
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+{
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+ int i;
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+ struct s390_map_info *map, *tmp;
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+
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+ for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
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+ if (!kvm->arch.adapters[i])
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+ continue;
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+ list_for_each_entry_safe(map, tmp,
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+ &kvm->arch.adapters[i]->maps, list) {
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+ list_del(&map->list);
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+ put_page(map->page);
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+ kfree(map);
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+ }
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+ kfree(kvm->arch.adapters[i]);
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+ }
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+}
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+
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+static int modify_io_adapter(struct kvm_device *dev,
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+ struct kvm_device_attr *attr)
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+{
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+ struct kvm_s390_io_adapter_req req;
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+ struct s390_io_adapter *adapter;
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+ int ret;
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+
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+ if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
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+ return -EFAULT;
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+
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+ adapter = get_io_adapter(dev->kvm, req.id);
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+ if (!adapter)
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+ return -EINVAL;
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+ switch (req.type) {
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+ case KVM_S390_IO_ADAPTER_MASK:
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+ ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
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+ if (ret > 0)
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+ ret = 0;
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+ break;
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+ case KVM_S390_IO_ADAPTER_MAP:
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+ ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
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+ break;
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+ case KVM_S390_IO_ADAPTER_UNMAP:
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+ ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
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+ break;
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+ default:
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+ ret = -EINVAL;
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+ }
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+
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+ return ret;
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+}
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+
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static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
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{
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int r = 0;
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@@ -1082,6 +1248,12 @@ static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
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kvm_for_each_vcpu(i, vcpu, dev->kvm)
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kvm_clear_async_pf_completion_queue(vcpu);
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break;
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+ case KVM_DEV_FLIC_ADAPTER_REGISTER:
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+ r = register_io_adapter(dev, attr);
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+ break;
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+ case KVM_DEV_FLIC_ADAPTER_MODIFY:
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+ r = modify_io_adapter(dev, attr);
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+ break;
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default:
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r = -EINVAL;
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}
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@@ -1113,3 +1285,123 @@ struct kvm_device_ops kvm_flic_ops = {
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.create = flic_create,
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.destroy = flic_destroy,
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};
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+
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+static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
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+{
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+ unsigned long bit;
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+
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+ bit = bit_nr + (addr % PAGE_SIZE) * 8;
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+
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+ return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
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+}
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+
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+static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
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+ u64 addr)
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+{
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+ struct s390_map_info *map;
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+
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+ if (!adapter)
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+ return NULL;
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+
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+ list_for_each_entry(map, &adapter->maps, list) {
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+ if (map->guest_addr == addr)
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+ return map;
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+ }
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+ return NULL;
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+}
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+
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+static int adapter_indicators_set(struct kvm *kvm,
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+ struct s390_io_adapter *adapter,
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+ struct kvm_s390_adapter_int *adapter_int)
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+{
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+ unsigned long bit;
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+ int summary_set, idx;
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+ struct s390_map_info *info;
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+ void *map;
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+
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+ info = get_map_info(adapter, adapter_int->ind_addr);
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+ if (!info)
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+ return -1;
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+ map = page_address(info->page);
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+ bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
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+ set_bit(bit, map);
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+ idx = srcu_read_lock(&kvm->srcu);
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+ mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
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+ set_page_dirty_lock(info->page);
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+ info = get_map_info(adapter, adapter_int->summary_addr);
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+ if (!info) {
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+ srcu_read_unlock(&kvm->srcu, idx);
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+ return -1;
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+ }
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+ map = page_address(info->page);
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+ bit = get_ind_bit(info->addr, adapter_int->summary_offset,
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+ adapter->swap);
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+ summary_set = test_and_set_bit(bit, map);
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+ mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
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+ set_page_dirty_lock(info->page);
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+ srcu_read_unlock(&kvm->srcu, idx);
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+ return summary_set ? 0 : 1;
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+}
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+
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+/*
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+ * < 0 - not injected due to error
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+ * = 0 - coalesced, summary indicator already active
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+ * > 0 - injected interrupt
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+ */
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+static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
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+ struct kvm *kvm, int irq_source_id, int level,
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+ bool line_status)
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+{
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+ int ret;
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+ struct s390_io_adapter *adapter;
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+
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+ /* We're only interested in the 0->1 transition. */
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+ if (!level)
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+ return 0;
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+ adapter = get_io_adapter(kvm, e->adapter.adapter_id);
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+ if (!adapter)
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+ return -1;
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+ down_read(&adapter->maps_lock);
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+ ret = adapter_indicators_set(kvm, adapter, &e->adapter);
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+ up_read(&adapter->maps_lock);
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+ if ((ret > 0) && !adapter->masked) {
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+ struct kvm_s390_interrupt s390int = {
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+ .type = KVM_S390_INT_IO(1, 0, 0, 0),
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+ .parm = 0,
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+ .parm64 = (adapter->isc << 27) | 0x80000000,
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+ };
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+ ret = kvm_s390_inject_vm(kvm, &s390int);
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+ if (ret == 0)
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+ ret = 1;
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+ }
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+ return ret;
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+}
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+
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+int kvm_set_routing_entry(struct kvm_irq_routing_table *rt,
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+ struct kvm_kernel_irq_routing_entry *e,
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+ const struct kvm_irq_routing_entry *ue)
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+{
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+ int ret;
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+
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+ switch (ue->type) {
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+ case KVM_IRQ_ROUTING_S390_ADAPTER:
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+ e->set = set_adapter_int;
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+ e->adapter.summary_addr = ue->u.adapter.summary_addr;
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+ e->adapter.ind_addr = ue->u.adapter.ind_addr;
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+ e->adapter.summary_offset = ue->u.adapter.summary_offset;
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+ e->adapter.ind_offset = ue->u.adapter.ind_offset;
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+ e->adapter.adapter_id = ue->u.adapter.adapter_id;
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+ ret = 0;
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+ break;
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+ default:
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+ ret = -EINVAL;
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+ }
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+
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+ return ret;
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+}
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+
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+int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
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+ int irq_source_id, int level, bool line_status)
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+{
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+ return -EINVAL;
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+}
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Paolo Bonzini