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Linux/arch/powerpc/kvm/book3s_64_vio.c

Version: ~ [ linux-5.18 ] ~ [ linux-5.17.9 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.41 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.117 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.195 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.244 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.280 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.315 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * This program is free software; you can redistribute it and/or modify
  3  * it under the terms of the GNU General Public License, version 2, as
  4  * published by the Free Software Foundation.
  5  *
  6  * This program is distributed in the hope that it will be useful,
  7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  9  * GNU General Public License for more details.
 10  *
 11  * You should have received a copy of the GNU General Public License
 12  * along with this program; if not, write to the Free Software
 13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 14  *
 15  * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
 16  * Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com>
 17  * Copyright 2016 Alexey Kardashevskiy, IBM Corporation <aik@au1.ibm.com>
 18  */
 19 
 20 #include <linux/types.h>
 21 #include <linux/string.h>
 22 #include <linux/kvm.h>
 23 #include <linux/kvm_host.h>
 24 #include <linux/highmem.h>
 25 #include <linux/gfp.h>
 26 #include <linux/slab.h>
 27 #include <linux/hugetlb.h>
 28 #include <linux/list.h>
 29 #include <linux/anon_inodes.h>
 30 
 31 #include <asm/tlbflush.h>
 32 #include <asm/kvm_ppc.h>
 33 #include <asm/kvm_book3s.h>
 34 #include <asm/book3s/64/mmu-hash.h>
 35 #include <asm/hvcall.h>
 36 #include <asm/synch.h>
 37 #include <asm/ppc-opcode.h>
 38 #include <asm/kvm_host.h>
 39 #include <asm/udbg.h>
 40 #include <asm/iommu.h>
 41 #include <asm/tce.h>
 42 
 43 static unsigned long kvmppc_tce_pages(unsigned long iommu_pages)
 44 {
 45         return ALIGN(iommu_pages * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
 46 }
 47 
 48 static unsigned long kvmppc_stt_pages(unsigned long tce_pages)
 49 {
 50         unsigned long stt_bytes = sizeof(struct kvmppc_spapr_tce_table) +
 51                         (tce_pages * sizeof(struct page *));
 52 
 53         return tce_pages + ALIGN(stt_bytes, PAGE_SIZE) / PAGE_SIZE;
 54 }
 55 
 56 static long kvmppc_account_memlimit(unsigned long stt_pages, bool inc)
 57 {
 58         long ret = 0;
 59 
 60         if (!current || !current->mm)
 61                 return ret; /* process exited */
 62 
 63         down_write(&current->mm->mmap_sem);
 64 
 65         if (inc) {
 66                 unsigned long locked, lock_limit;
 67 
 68                 locked = current->mm->locked_vm + stt_pages;
 69                 lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
 70                 if (locked > lock_limit && !capable(CAP_IPC_LOCK))
 71                         ret = -ENOMEM;
 72                 else
 73                         current->mm->locked_vm += stt_pages;
 74         } else {
 75                 if (WARN_ON_ONCE(stt_pages > current->mm->locked_vm))
 76                         stt_pages = current->mm->locked_vm;
 77 
 78                 current->mm->locked_vm -= stt_pages;
 79         }
 80 
 81         pr_debug("[%d] RLIMIT_MEMLOCK KVM %c%ld %ld/%ld%s\n", current->pid,
 82                         inc ? '+' : '-',
 83                         stt_pages << PAGE_SHIFT,
 84                         current->mm->locked_vm << PAGE_SHIFT,
 85                         rlimit(RLIMIT_MEMLOCK),
 86                         ret ? " - exceeded" : "");
 87 
 88         up_write(&current->mm->mmap_sem);
 89 
 90         return ret;
 91 }
 92 
 93 static void release_spapr_tce_table(struct rcu_head *head)
 94 {
 95         struct kvmppc_spapr_tce_table *stt = container_of(head,
 96                         struct kvmppc_spapr_tce_table, rcu);
 97         unsigned long i, npages = kvmppc_tce_pages(stt->size);
 98 
 99         for (i = 0; i < npages; i++)
100                 __free_page(stt->pages[i]);
101 
102         kfree(stt);
103 }
104 
105 static int kvm_spapr_tce_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
106 {
107         struct kvmppc_spapr_tce_table *stt = vma->vm_file->private_data;
108         struct page *page;
109 
110         if (vmf->pgoff >= kvmppc_tce_pages(stt->size))
111                 return VM_FAULT_SIGBUS;
112 
113         page = stt->pages[vmf->pgoff];
114         get_page(page);
115         vmf->page = page;
116         return 0;
117 }
118 
119 static const struct vm_operations_struct kvm_spapr_tce_vm_ops = {
120         .fault = kvm_spapr_tce_fault,
121 };
122 
123 static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma)
124 {
125         vma->vm_ops = &kvm_spapr_tce_vm_ops;
126         return 0;
127 }
128 
129 static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
130 {
131         struct kvmppc_spapr_tce_table *stt = filp->private_data;
132 
133         list_del_rcu(&stt->list);
134 
135         kvm_put_kvm(stt->kvm);
136 
137         kvmppc_account_memlimit(
138                 kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false);
139         call_rcu(&stt->rcu, release_spapr_tce_table);
140 
141         return 0;
142 }
143 
144 static const struct file_operations kvm_spapr_tce_fops = {
145         .mmap           = kvm_spapr_tce_mmap,
146         .release        = kvm_spapr_tce_release,
147 };
148 
149 long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
150                                    struct kvm_create_spapr_tce_64 *args)
151 {
152         struct kvmppc_spapr_tce_table *stt = NULL;
153         unsigned long npages, size;
154         int ret = -ENOMEM;
155         int i;
156 
157         if (!args->size)
158                 return -EINVAL;
159 
160         /* Check this LIOBN hasn't been previously allocated */
161         list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
162                 if (stt->liobn == args->liobn)
163                         return -EBUSY;
164         }
165 
166         size = args->size;
167         npages = kvmppc_tce_pages(size);
168         ret = kvmppc_account_memlimit(kvmppc_stt_pages(npages), true);
169         if (ret) {
170                 stt = NULL;
171                 goto fail;
172         }
173 
174         stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *),
175                       GFP_KERNEL);
176         if (!stt)
177                 goto fail;
178 
179         stt->liobn = args->liobn;
180         stt->page_shift = args->page_shift;
181         stt->offset = args->offset;
182         stt->size = size;
183         stt->kvm = kvm;
184 
185         for (i = 0; i < npages; i++) {
186                 stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
187                 if (!stt->pages[i])
188                         goto fail;
189         }
190 
191         kvm_get_kvm(kvm);
192 
193         mutex_lock(&kvm->lock);
194         list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables);
195 
196         mutex_unlock(&kvm->lock);
197 
198         return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
199                                 stt, O_RDWR | O_CLOEXEC);
200 
201 fail:
202         if (stt) {
203                 for (i = 0; i < npages; i++)
204                         if (stt->pages[i])
205                                 __free_page(stt->pages[i]);
206 
207                 kfree(stt);
208         }
209         return ret;
210 }
211 
212 long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
213                       unsigned long ioba, unsigned long tce)
214 {
215         struct kvmppc_spapr_tce_table *stt = kvmppc_find_table(vcpu, liobn);
216         long ret;
217 
218         /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
219         /*          liobn, ioba, tce); */
220 
221         if (!stt)
222                 return H_TOO_HARD;
223 
224         ret = kvmppc_ioba_validate(stt, ioba, 1);
225         if (ret != H_SUCCESS)
226                 return ret;
227 
228         ret = kvmppc_tce_validate(stt, tce);
229         if (ret != H_SUCCESS)
230                 return ret;
231 
232         kvmppc_tce_put(stt, ioba >> stt->page_shift, tce);
233 
234         return H_SUCCESS;
235 }
236 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce);
237 
238 long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
239                 unsigned long liobn, unsigned long ioba,
240                 unsigned long tce_list, unsigned long npages)
241 {
242         struct kvmppc_spapr_tce_table *stt;
243         long i, ret = H_SUCCESS, idx;
244         unsigned long entry, ua = 0;
245         u64 __user *tces, tce;
246 
247         stt = kvmppc_find_table(vcpu, liobn);
248         if (!stt)
249                 return H_TOO_HARD;
250 
251         entry = ioba >> stt->page_shift;
252         /*
253          * SPAPR spec says that the maximum size of the list is 512 TCEs
254          * so the whole table fits in 4K page
255          */
256         if (npages > 512)
257                 return H_PARAMETER;
258 
259         if (tce_list & (SZ_4K - 1))
260                 return H_PARAMETER;
261 
262         ret = kvmppc_ioba_validate(stt, ioba, npages);
263         if (ret != H_SUCCESS)
264                 return ret;
265 
266         idx = srcu_read_lock(&vcpu->kvm->srcu);
267         if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, NULL)) {
268                 ret = H_TOO_HARD;
269                 goto unlock_exit;
270         }
271         tces = (u64 __user *) ua;
272 
273         for (i = 0; i < npages; ++i) {
274                 if (get_user(tce, tces + i)) {
275                         ret = H_TOO_HARD;
276                         goto unlock_exit;
277                 }
278                 tce = be64_to_cpu(tce);
279 
280                 ret = kvmppc_tce_validate(stt, tce);
281                 if (ret != H_SUCCESS)
282                         goto unlock_exit;
283 
284                 kvmppc_tce_put(stt, entry + i, tce);
285         }
286 
287 unlock_exit:
288         srcu_read_unlock(&vcpu->kvm->srcu, idx);
289 
290         return ret;
291 }
292 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect);
293 
294 long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
295                 unsigned long liobn, unsigned long ioba,
296                 unsigned long tce_value, unsigned long npages)
297 {
298         struct kvmppc_spapr_tce_table *stt;
299         long i, ret;
300 
301         stt = kvmppc_find_table(vcpu, liobn);
302         if (!stt)
303                 return H_TOO_HARD;
304 
305         ret = kvmppc_ioba_validate(stt, ioba, npages);
306         if (ret != H_SUCCESS)
307                 return ret;
308 
309         /* Check permission bits only to allow userspace poison TCE for debug */
310         if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ))
311                 return H_PARAMETER;
312 
313         for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
314                 kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value);
315 
316         return H_SUCCESS;
317 }
318 EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce);
319 

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