/* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License, version 2, as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> * Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com> */ #include <linux/types.h> #include <linux/string.h> #include <linux/kvm.h> #include <linux/kvm_host.h> #include <linux/highmem.h> #include <linux/gfp.h> #include <linux/slab.h> #include <linux/hugetlb.h> #include <linux/list.h> #include <linux/anon_inodes.h> #include <asm/tlbflush.h> #include <asm/kvm_ppc.h> #include <asm/kvm_book3s.h> #include <asm/mmu-hash64.h> #include <asm/hvcall.h> #include <asm/synch.h> #include <asm/ppc-opcode.h> #include <asm/kvm_host.h> #include <asm/udbg.h> #define TCES_PER_PAGE (PAGE_SIZE / sizeof(u64)) static long kvmppc_stt_npages(unsigned long window_size) { return ALIGN((window_size >> SPAPR_TCE_SHIFT) * sizeof(u64), PAGE_SIZE) / PAGE_SIZE; } static void release_spapr_tce_table(struct kvmppc_spapr_tce_table *stt) { struct kvm *kvm = stt->kvm; int i; mutex_lock(&kvm->lock); list_del(&stt->list); for (i = 0; i < kvmppc_stt_npages(stt->window_size); i++) __free_page(stt->pages[i]); kfree(stt); mutex_unlock(&kvm->lock); kvm_put_kvm(kvm); } static int kvm_spapr_tce_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { struct kvmppc_spapr_tce_table *stt = vma->vm_file->private_data; struct page *page; if (vmf->pgoff >= kvmppc_stt_npages(stt->window_size)) return VM_FAULT_SIGBUS; page = stt->pages[vmf->pgoff]; get_page(page); vmf->page = page; return 0; } static const struct vm_operations_struct kvm_spapr_tce_vm_ops = { .fault = kvm_spapr_tce_fault, }; static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma) { vma->vm_ops = &kvm_spapr_tce_vm_ops; return 0; } static int kvm_spapr_tce_release(struct inode *inode, struct file *filp) { struct kvmppc_spapr_tce_table *stt = filp->private_data; release_spapr_tce_table(stt); return 0; } static const struct file_operations kvm_spapr_tce_fops = { .mmap = kvm_spapr_tce_mmap, .release = kvm_spapr_tce_release, }; long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, struct kvm_create_spapr_tce *args) { struct kvmppc_spapr_tce_table *stt = NULL; long npages; int ret = -ENOMEM; int i; /* Check this LIOBN hasn't been previously allocated */ list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) { if (stt->liobn == args->liobn) return -EBUSY; } npages = kvmppc_stt_npages(args->window_size); stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *), GFP_KERNEL); if (!stt) goto fail; stt->liobn = args->liobn; stt->window_size = args->window_size; stt->kvm = kvm; for (i = 0; i < npages; i++) { stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO); if (!stt->pages[i]) goto fail; } kvm_get_kvm(kvm); mutex_lock(&kvm->lock); list_add(&stt->list, &kvm->arch.spapr_tce_tables); mutex_unlock(&kvm->lock); return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, stt, O_RDWR); fail: if (stt) { for (i = 0; i < npages; i++) if (stt->pages[i]) __free_page(stt->pages[i]); kfree(stt); } return ret; }