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.
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.
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.
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>
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>
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>
40 #include <asm/iommu.h>
43 static unsigned long kvmppc_tce_pages(unsigned long iommu_pages)
45 return ALIGN(iommu_pages * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
48 static unsigned long kvmppc_stt_pages(unsigned long tce_pages)
50 unsigned long stt_bytes = sizeof(struct kvmppc_spapr_tce_table) +
51 (tce_pages * sizeof(struct page *));
53 return tce_pages + ALIGN(stt_bytes, PAGE_SIZE) / PAGE_SIZE;
56 static long kvmppc_account_memlimit(unsigned long stt_pages, bool inc)
60 if (!current || !current->mm)
61 return ret; /* process exited */
63 down_write(¤t->mm->mmap_sem);
66 unsigned long locked, lock_limit;
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))
73 current->mm->locked_vm += stt_pages;
75 if (WARN_ON_ONCE(stt_pages > current->mm->locked_vm))
76 stt_pages = current->mm->locked_vm;
78 current->mm->locked_vm -= stt_pages;
81 pr_debug("[%d] RLIMIT_MEMLOCK KVM %c%ld %ld/%ld%s\n", current->pid,
83 stt_pages << PAGE_SHIFT,
84 current->mm->locked_vm << PAGE_SHIFT,
85 rlimit(RLIMIT_MEMLOCK),
86 ret ? " - exceeded" : "");
88 up_write(¤t->mm->mmap_sem);
93 static void release_spapr_tce_table(struct rcu_head *head)
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);
99 for (i = 0; i < npages; i++)
100 __free_page(stt->pages[i]);
105 static int kvm_spapr_tce_fault(struct vm_fault *vmf)
107 struct kvmppc_spapr_tce_table *stt = vmf->vma->vm_file->private_data;
110 if (vmf->pgoff >= kvmppc_tce_pages(stt->size))
111 return VM_FAULT_SIGBUS;
113 page = stt->pages[vmf->pgoff];
119 static const struct vm_operations_struct kvm_spapr_tce_vm_ops = {
120 .fault = kvm_spapr_tce_fault,
123 static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma)
125 vma->vm_ops = &kvm_spapr_tce_vm_ops;
129 static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
131 struct kvmppc_spapr_tce_table *stt = filp->private_data;
133 list_del_rcu(&stt->list);
135 kvm_put_kvm(stt->kvm);
137 kvmppc_account_memlimit(
138 kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false);
139 call_rcu(&stt->rcu, release_spapr_tce_table);
144 static const struct file_operations kvm_spapr_tce_fops = {
145 .mmap = kvm_spapr_tce_mmap,
146 .release = kvm_spapr_tce_release,
149 long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
150 struct kvm_create_spapr_tce_64 *args)
152 struct kvmppc_spapr_tce_table *stt = NULL;
153 unsigned long npages, size;
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)
167 npages = kvmppc_tce_pages(size);
168 ret = kvmppc_account_memlimit(kvmppc_stt_pages(npages), true);
175 stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *),
180 stt->liobn = args->liobn;
181 stt->page_shift = args->page_shift;
182 stt->offset = args->offset;
186 for (i = 0; i < npages; i++) {
187 stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
194 mutex_lock(&kvm->lock);
195 list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables);
197 mutex_unlock(&kvm->lock);
199 return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
200 stt, O_RDWR | O_CLOEXEC);
204 for (i = 0; i < npages; i++)
206 __free_page(stt->pages[i]);
213 long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
214 unsigned long ioba, unsigned long tce)
216 struct kvmppc_spapr_tce_table *stt = kvmppc_find_table(vcpu, liobn);
219 /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
220 /* liobn, ioba, tce); */
225 ret = kvmppc_ioba_validate(stt, ioba, 1);
226 if (ret != H_SUCCESS)
229 ret = kvmppc_tce_validate(stt, tce);
230 if (ret != H_SUCCESS)
233 kvmppc_tce_put(stt, ioba >> stt->page_shift, tce);
237 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce);
239 long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
240 unsigned long liobn, unsigned long ioba,
241 unsigned long tce_list, unsigned long npages)
243 struct kvmppc_spapr_tce_table *stt;
244 long i, ret = H_SUCCESS, idx;
245 unsigned long entry, ua = 0;
249 stt = kvmppc_find_table(vcpu, liobn);
253 entry = ioba >> stt->page_shift;
255 * SPAPR spec says that the maximum size of the list is 512 TCEs
256 * so the whole table fits in 4K page
261 if (tce_list & (SZ_4K - 1))
264 ret = kvmppc_ioba_validate(stt, ioba, npages);
265 if (ret != H_SUCCESS)
268 idx = srcu_read_lock(&vcpu->kvm->srcu);
269 if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, NULL)) {
273 tces = (u64 __user *) ua;
275 for (i = 0; i < npages; ++i) {
276 if (get_user(tce, tces + i)) {
280 tce = be64_to_cpu(tce);
282 ret = kvmppc_tce_validate(stt, tce);
283 if (ret != H_SUCCESS)
286 kvmppc_tce_put(stt, entry + i, tce);
290 srcu_read_unlock(&vcpu->kvm->srcu, idx);
294 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect);
296 long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
297 unsigned long liobn, unsigned long ioba,
298 unsigned long tce_value, unsigned long npages)
300 struct kvmppc_spapr_tce_table *stt;
303 stt = kvmppc_find_table(vcpu, liobn);
307 ret = kvmppc_ioba_validate(stt, ioba, npages);
308 if (ret != H_SUCCESS)
311 /* Check permission bits only to allow userspace poison TCE for debug */
312 if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ))
315 for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
316 kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value);
320 EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce);