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Linux/virt/kvm/irqchip.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * irqchip.c: Common API for in kernel interrupt controllers
  4  * Copyright (c) 2007, Intel Corporation.
  5  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
  6  * Copyright (c) 2013, Alexander Graf <agraf@suse.de>
  7  *
  8  * This file is derived from virt/kvm/irq_comm.c.
  9  *
 10  * Authors:
 11  *   Yaozu (Eddie) Dong <Eddie.dong@intel.com>
 12  *   Alexander Graf <agraf@suse.de>
 13  */
 14 
 15 #include <linux/kvm_host.h>
 16 #include <linux/slab.h>
 17 #include <linux/srcu.h>
 18 #include <linux/export.h>
 19 #include <trace/events/kvm.h>
 20 #include "irq.h"
 21 
 22 int kvm_irq_map_gsi(struct kvm *kvm,
 23                     struct kvm_kernel_irq_routing_entry *entries, int gsi)
 24 {
 25         struct kvm_irq_routing_table *irq_rt;
 26         struct kvm_kernel_irq_routing_entry *e;
 27         int n = 0;
 28 
 29         irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
 30                                         lockdep_is_held(&kvm->irq_lock));
 31         if (irq_rt && gsi < irq_rt->nr_rt_entries) {
 32                 hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
 33                         entries[n] = *e;
 34                         ++n;
 35                 }
 36         }
 37 
 38         return n;
 39 }
 40 
 41 int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin)
 42 {
 43         struct kvm_irq_routing_table *irq_rt;
 44 
 45         irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
 46         return irq_rt->chip[irqchip][pin];
 47 }
 48 
 49 int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi)
 50 {
 51         struct kvm_kernel_irq_routing_entry route;
 52 
 53         if (!irqchip_in_kernel(kvm) || (msi->flags & ~KVM_MSI_VALID_DEVID))
 54                 return -EINVAL;
 55 
 56         route.msi.address_lo = msi->address_lo;
 57         route.msi.address_hi = msi->address_hi;
 58         route.msi.data = msi->data;
 59         route.msi.flags = msi->flags;
 60         route.msi.devid = msi->devid;
 61 
 62         return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1, false);
 63 }
 64 
 65 /*
 66  * Return value:
 67  *  < 0   Interrupt was ignored (masked or not delivered for other reasons)
 68  *  = 0   Interrupt was coalesced (previous irq is still pending)
 69  *  > 0   Number of CPUs interrupt was delivered to
 70  */
 71 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
 72                 bool line_status)
 73 {
 74         struct kvm_kernel_irq_routing_entry irq_set[KVM_NR_IRQCHIPS];
 75         int ret = -1, i, idx;
 76 
 77         trace_kvm_set_irq(irq, level, irq_source_id);
 78 
 79         /* Not possible to detect if the guest uses the PIC or the
 80          * IOAPIC.  So set the bit in both. The guest will ignore
 81          * writes to the unused one.
 82          */
 83         idx = srcu_read_lock(&kvm->irq_srcu);
 84         i = kvm_irq_map_gsi(kvm, irq_set, irq);
 85         srcu_read_unlock(&kvm->irq_srcu, idx);
 86 
 87         while (i--) {
 88                 int r;
 89                 r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level,
 90                                    line_status);
 91                 if (r < 0)
 92                         continue;
 93 
 94                 ret = r + ((ret < 0) ? 0 : ret);
 95         }
 96 
 97         return ret;
 98 }
 99 
100 static void free_irq_routing_table(struct kvm_irq_routing_table *rt)
101 {
102         int i;
103 
104         if (!rt)
105                 return;
106 
107         for (i = 0; i < rt->nr_rt_entries; ++i) {
108                 struct kvm_kernel_irq_routing_entry *e;
109                 struct hlist_node *n;
110 
111                 hlist_for_each_entry_safe(e, n, &rt->map[i], link) {
112                         hlist_del(&e->link);
113                         kfree(e);
114                 }
115         }
116 
117         kfree(rt);
118 }
119 
120 void kvm_free_irq_routing(struct kvm *kvm)
121 {
122         /* Called only during vm destruction. Nobody can use the pointer
123            at this stage */
124         struct kvm_irq_routing_table *rt = rcu_access_pointer(kvm->irq_routing);
125         free_irq_routing_table(rt);
126 }
127 
128 static int setup_routing_entry(struct kvm *kvm,
129                                struct kvm_irq_routing_table *rt,
130                                struct kvm_kernel_irq_routing_entry *e,
131                                const struct kvm_irq_routing_entry *ue)
132 {
133         struct kvm_kernel_irq_routing_entry *ei;
134         int r;
135         u32 gsi = array_index_nospec(ue->gsi, KVM_MAX_IRQ_ROUTES);
136 
137         /*
138          * Do not allow GSI to be mapped to the same irqchip more than once.
139          * Allow only one to one mapping between GSI and non-irqchip routing.
140          */
141         hlist_for_each_entry(ei, &rt->map[gsi], link)
142                 if (ei->type != KVM_IRQ_ROUTING_IRQCHIP ||
143                     ue->type != KVM_IRQ_ROUTING_IRQCHIP ||
144                     ue->u.irqchip.irqchip == ei->irqchip.irqchip)
145                         return -EINVAL;
146 
147         e->gsi = gsi;
148         e->type = ue->type;
149         r = kvm_set_routing_entry(kvm, e, ue);
150         if (r)
151                 return r;
152         if (e->type == KVM_IRQ_ROUTING_IRQCHIP)
153                 rt->chip[e->irqchip.irqchip][e->irqchip.pin] = e->gsi;
154 
155         hlist_add_head(&e->link, &rt->map[e->gsi]);
156 
157         return 0;
158 }
159 
160 void __attribute__((weak)) kvm_arch_irq_routing_update(struct kvm *kvm)
161 {
162 }
163 
164 bool __weak kvm_arch_can_set_irq_routing(struct kvm *kvm)
165 {
166         return true;
167 }
168 
169 int kvm_set_irq_routing(struct kvm *kvm,
170                         const struct kvm_irq_routing_entry *ue,
171                         unsigned nr,
172                         unsigned flags)
173 {
174         struct kvm_irq_routing_table *new, *old;
175         struct kvm_kernel_irq_routing_entry *e;
176         u32 i, j, nr_rt_entries = 0;
177         int r;
178 
179         for (i = 0; i < nr; ++i) {
180                 if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES)
181                         return -EINVAL;
182                 nr_rt_entries = max(nr_rt_entries, ue[i].gsi);
183         }
184 
185         nr_rt_entries += 1;
186 
187         new = kzalloc(struct_size(new, map, nr_rt_entries), GFP_KERNEL_ACCOUNT);
188         if (!new)
189                 return -ENOMEM;
190 
191         new->nr_rt_entries = nr_rt_entries;
192         for (i = 0; i < KVM_NR_IRQCHIPS; i++)
193                 for (j = 0; j < KVM_IRQCHIP_NUM_PINS; j++)
194                         new->chip[i][j] = -1;
195 
196         for (i = 0; i < nr; ++i) {
197                 r = -ENOMEM;
198                 e = kzalloc(sizeof(*e), GFP_KERNEL_ACCOUNT);
199                 if (!e)
200                         goto out;
201 
202                 r = -EINVAL;
203                 switch (ue->type) {
204                 case KVM_IRQ_ROUTING_MSI:
205                         if (ue->flags & ~KVM_MSI_VALID_DEVID)
206                                 goto free_entry;
207                         break;
208                 default:
209                         if (ue->flags)
210                                 goto free_entry;
211                         break;
212                 }
213                 r = setup_routing_entry(kvm, new, e, ue);
214                 if (r)
215                         goto free_entry;
216                 ++ue;
217         }
218 
219         mutex_lock(&kvm->irq_lock);
220         old = rcu_dereference_protected(kvm->irq_routing, 1);
221         rcu_assign_pointer(kvm->irq_routing, new);
222         kvm_irq_routing_update(kvm);
223         kvm_arch_irq_routing_update(kvm);
224         mutex_unlock(&kvm->irq_lock);
225 
226         kvm_arch_post_irq_routing_update(kvm);
227 
228         synchronize_srcu_expedited(&kvm->irq_srcu);
229 
230         new = old;
231         r = 0;
232         goto out;
233 
234 free_entry:
235         kfree(e);
236 out:
237         free_irq_routing_table(new);
238 
239         return r;
240 }
241 

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