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![Wang Wensheng](/assets/img/avatar_default.png)
Build the kernel with `C=2`: arch/powerpc/kvm/book3s_hv_nested.c:572:25: warning: symbol 'kvmhv_alloc_nested' was not declared. Should it be static? arch/powerpc/kvm/book3s_64_mmu_radix.c:350:6: warning: symbol 'kvmppc_radix_set_pte_at' was not declared. Should it be static? arch/powerpc/kvm/book3s_hv.c:3568:5: warning: symbol 'kvmhv_p9_guest_entry' was not declared. Should it be static? arch/powerpc/kvm/book3s_hv_rm_xics.c:767:15: warning: symbol 'eoi_rc' was not declared. Should it be static? arch/powerpc/kvm/book3s_64_vio_hv.c:240:13: warning: symbol 'iommu_tce_kill_rm' was not declared. Should it be static? arch/powerpc/kvm/book3s_64_vio.c:492:6: warning: symbol 'kvmppc_tce_iommu_do_map' was not declared. Should it be static? arch/powerpc/kvm/book3s_pr.c:572:6: warning: symbol 'kvmppc_set_pvr_pr' was not declared. Should it be static? Those symbols are used only in the files that define them so make them static to fix the warnings. Signed-off-by: Wang Wensheng <wangwensheng4@huawei.com> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
755 lines
18 KiB
C
755 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
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* Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com>
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* Copyright 2016 Alexey Kardashevskiy, IBM Corporation <aik@au1.ibm.com>
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*/
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kvm.h>
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#include <linux/kvm_host.h>
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#include <linux/highmem.h>
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#include <linux/gfp.h>
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#include <linux/slab.h>
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#include <linux/sched/signal.h>
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#include <linux/hugetlb.h>
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#include <linux/list.h>
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#include <linux/anon_inodes.h>
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#include <linux/iommu.h>
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#include <linux/file.h>
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#include <linux/mm.h>
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#include <asm/kvm_ppc.h>
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#include <asm/kvm_book3s.h>
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#include <asm/book3s/64/mmu-hash.h>
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#include <asm/hvcall.h>
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#include <asm/synch.h>
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#include <asm/ppc-opcode.h>
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#include <asm/udbg.h>
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#include <asm/iommu.h>
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#include <asm/tce.h>
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#include <asm/mmu_context.h>
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static unsigned long kvmppc_tce_pages(unsigned long iommu_pages)
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{
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return ALIGN(iommu_pages * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
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}
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static unsigned long kvmppc_stt_pages(unsigned long tce_pages)
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{
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unsigned long stt_bytes = sizeof(struct kvmppc_spapr_tce_table) +
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(tce_pages * sizeof(struct page *));
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return tce_pages + ALIGN(stt_bytes, PAGE_SIZE) / PAGE_SIZE;
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}
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static void kvm_spapr_tce_iommu_table_free(struct rcu_head *head)
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{
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struct kvmppc_spapr_tce_iommu_table *stit = container_of(head,
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struct kvmppc_spapr_tce_iommu_table, rcu);
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iommu_tce_table_put(stit->tbl);
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kfree(stit);
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}
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static void kvm_spapr_tce_liobn_put(struct kref *kref)
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{
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struct kvmppc_spapr_tce_iommu_table *stit = container_of(kref,
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struct kvmppc_spapr_tce_iommu_table, kref);
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list_del_rcu(&stit->next);
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call_rcu(&stit->rcu, kvm_spapr_tce_iommu_table_free);
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}
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extern void kvm_spapr_tce_release_iommu_group(struct kvm *kvm,
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struct iommu_group *grp)
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{
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int i;
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struct kvmppc_spapr_tce_table *stt;
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struct kvmppc_spapr_tce_iommu_table *stit, *tmp;
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struct iommu_table_group *table_group = NULL;
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rcu_read_lock();
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list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) {
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table_group = iommu_group_get_iommudata(grp);
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if (WARN_ON(!table_group))
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continue;
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list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) {
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for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
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if (table_group->tables[i] != stit->tbl)
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continue;
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kref_put(&stit->kref, kvm_spapr_tce_liobn_put);
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}
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}
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cond_resched_rcu();
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}
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rcu_read_unlock();
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}
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extern long kvm_spapr_tce_attach_iommu_group(struct kvm *kvm, int tablefd,
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struct iommu_group *grp)
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{
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struct kvmppc_spapr_tce_table *stt = NULL;
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bool found = false;
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struct iommu_table *tbl = NULL;
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struct iommu_table_group *table_group;
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long i;
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struct kvmppc_spapr_tce_iommu_table *stit;
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struct fd f;
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f = fdget(tablefd);
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if (!f.file)
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return -EBADF;
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rcu_read_lock();
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list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) {
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if (stt == f.file->private_data) {
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found = true;
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break;
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}
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}
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rcu_read_unlock();
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fdput(f);
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if (!found)
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return -EINVAL;
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table_group = iommu_group_get_iommudata(grp);
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if (WARN_ON(!table_group))
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return -EFAULT;
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for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
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struct iommu_table *tbltmp = table_group->tables[i];
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if (!tbltmp)
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continue;
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/* Make sure hardware table parameters are compatible */
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if ((tbltmp->it_page_shift <= stt->page_shift) &&
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(tbltmp->it_offset << tbltmp->it_page_shift ==
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stt->offset << stt->page_shift) &&
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(tbltmp->it_size << tbltmp->it_page_shift >=
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stt->size << stt->page_shift)) {
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/*
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* Reference the table to avoid races with
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* add/remove DMA windows.
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*/
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tbl = iommu_tce_table_get(tbltmp);
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break;
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}
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}
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if (!tbl)
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return -EINVAL;
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rcu_read_lock();
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list_for_each_entry_rcu(stit, &stt->iommu_tables, next) {
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if (tbl != stit->tbl)
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continue;
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if (!kref_get_unless_zero(&stit->kref)) {
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/* stit is being destroyed */
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iommu_tce_table_put(tbl);
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rcu_read_unlock();
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return -ENOTTY;
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}
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/*
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* The table is already known to this KVM, we just increased
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* its KVM reference counter and can return.
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*/
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rcu_read_unlock();
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return 0;
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}
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rcu_read_unlock();
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stit = kzalloc(sizeof(*stit), GFP_KERNEL);
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if (!stit) {
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iommu_tce_table_put(tbl);
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return -ENOMEM;
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}
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stit->tbl = tbl;
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kref_init(&stit->kref);
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list_add_rcu(&stit->next, &stt->iommu_tables);
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return 0;
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}
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static void release_spapr_tce_table(struct rcu_head *head)
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{
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struct kvmppc_spapr_tce_table *stt = container_of(head,
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struct kvmppc_spapr_tce_table, rcu);
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unsigned long i, npages = kvmppc_tce_pages(stt->size);
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for (i = 0; i < npages; i++)
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if (stt->pages[i])
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__free_page(stt->pages[i]);
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kfree(stt);
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}
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static struct page *kvm_spapr_get_tce_page(struct kvmppc_spapr_tce_table *stt,
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unsigned long sttpage)
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{
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struct page *page = stt->pages[sttpage];
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if (page)
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return page;
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mutex_lock(&stt->alloc_lock);
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page = stt->pages[sttpage];
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if (!page) {
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page = alloc_page(GFP_KERNEL | __GFP_ZERO);
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WARN_ON_ONCE(!page);
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if (page)
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stt->pages[sttpage] = page;
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}
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mutex_unlock(&stt->alloc_lock);
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return page;
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}
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static vm_fault_t kvm_spapr_tce_fault(struct vm_fault *vmf)
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{
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struct kvmppc_spapr_tce_table *stt = vmf->vma->vm_file->private_data;
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struct page *page;
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if (vmf->pgoff >= kvmppc_tce_pages(stt->size))
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return VM_FAULT_SIGBUS;
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page = kvm_spapr_get_tce_page(stt, vmf->pgoff);
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if (!page)
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return VM_FAULT_OOM;
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get_page(page);
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vmf->page = page;
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return 0;
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}
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static const struct vm_operations_struct kvm_spapr_tce_vm_ops = {
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.fault = kvm_spapr_tce_fault,
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};
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static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma)
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{
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vma->vm_ops = &kvm_spapr_tce_vm_ops;
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return 0;
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}
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static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
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{
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struct kvmppc_spapr_tce_table *stt = filp->private_data;
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struct kvmppc_spapr_tce_iommu_table *stit, *tmp;
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struct kvm *kvm = stt->kvm;
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mutex_lock(&kvm->lock);
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list_del_rcu(&stt->list);
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mutex_unlock(&kvm->lock);
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list_for_each_entry_safe(stit, tmp, &stt->iommu_tables, next) {
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WARN_ON(!kref_read(&stit->kref));
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while (1) {
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if (kref_put(&stit->kref, kvm_spapr_tce_liobn_put))
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break;
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}
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}
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account_locked_vm(kvm->mm,
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kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false);
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kvm_put_kvm(stt->kvm);
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call_rcu(&stt->rcu, release_spapr_tce_table);
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return 0;
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}
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static const struct file_operations kvm_spapr_tce_fops = {
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.mmap = kvm_spapr_tce_mmap,
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.release = kvm_spapr_tce_release,
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};
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long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
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struct kvm_create_spapr_tce_64 *args)
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{
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struct kvmppc_spapr_tce_table *stt = NULL;
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struct kvmppc_spapr_tce_table *siter;
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struct mm_struct *mm = kvm->mm;
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unsigned long npages, size = args->size;
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int ret;
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if (!args->size || args->page_shift < 12 || args->page_shift > 34 ||
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(args->offset + args->size > (ULLONG_MAX >> args->page_shift)))
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return -EINVAL;
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npages = kvmppc_tce_pages(size);
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ret = account_locked_vm(mm, kvmppc_stt_pages(npages), true);
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if (ret)
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return ret;
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ret = -ENOMEM;
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stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *),
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GFP_KERNEL);
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if (!stt)
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goto fail_acct;
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stt->liobn = args->liobn;
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stt->page_shift = args->page_shift;
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stt->offset = args->offset;
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stt->size = size;
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stt->kvm = kvm;
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mutex_init(&stt->alloc_lock);
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INIT_LIST_HEAD_RCU(&stt->iommu_tables);
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mutex_lock(&kvm->lock);
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/* Check this LIOBN hasn't been previously allocated */
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ret = 0;
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list_for_each_entry(siter, &kvm->arch.spapr_tce_tables, list) {
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if (siter->liobn == args->liobn) {
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ret = -EBUSY;
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break;
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}
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}
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kvm_get_kvm(kvm);
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if (!ret)
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ret = anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
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stt, O_RDWR | O_CLOEXEC);
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if (ret >= 0)
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list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables);
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else
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kvm_put_kvm_no_destroy(kvm);
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mutex_unlock(&kvm->lock);
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if (ret >= 0)
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return ret;
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kfree(stt);
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fail_acct:
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account_locked_vm(mm, kvmppc_stt_pages(npages), false);
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return ret;
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}
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static long kvmppc_tce_to_ua(struct kvm *kvm, unsigned long tce,
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unsigned long *ua)
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{
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unsigned long gfn = tce >> PAGE_SHIFT;
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struct kvm_memory_slot *memslot;
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memslot = search_memslots(kvm_memslots(kvm), gfn);
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if (!memslot)
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return -EINVAL;
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*ua = __gfn_to_hva_memslot(memslot, gfn) |
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(tce & ~(PAGE_MASK | TCE_PCI_READ | TCE_PCI_WRITE));
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return 0;
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}
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static long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *stt,
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unsigned long tce)
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{
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unsigned long gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE);
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enum dma_data_direction dir = iommu_tce_direction(tce);
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struct kvmppc_spapr_tce_iommu_table *stit;
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unsigned long ua = 0;
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/* Allow userspace to poison TCE table */
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if (dir == DMA_NONE)
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return H_SUCCESS;
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if (iommu_tce_check_gpa(stt->page_shift, gpa))
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return H_TOO_HARD;
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if (kvmppc_tce_to_ua(stt->kvm, tce, &ua))
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return H_TOO_HARD;
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rcu_read_lock();
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list_for_each_entry_rcu(stit, &stt->iommu_tables, next) {
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unsigned long hpa = 0;
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struct mm_iommu_table_group_mem_t *mem;
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long shift = stit->tbl->it_page_shift;
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mem = mm_iommu_lookup(stt->kvm->mm, ua, 1ULL << shift);
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if (!mem || mm_iommu_ua_to_hpa(mem, ua, shift, &hpa)) {
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rcu_read_unlock();
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return H_TOO_HARD;
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}
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}
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rcu_read_unlock();
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return H_SUCCESS;
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}
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/*
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* Handles TCE requests for emulated devices.
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* Puts guest TCE values to the table and expects user space to convert them.
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* Cannot fail so kvmppc_tce_validate must be called before it.
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*/
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static void kvmppc_tce_put(struct kvmppc_spapr_tce_table *stt,
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unsigned long idx, unsigned long tce)
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{
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struct page *page;
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u64 *tbl;
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unsigned long sttpage;
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idx -= stt->offset;
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sttpage = idx / TCES_PER_PAGE;
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page = stt->pages[sttpage];
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if (!page) {
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/* We allow any TCE, not just with read|write permissions */
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if (!tce)
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return;
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page = kvm_spapr_get_tce_page(stt, sttpage);
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if (!page)
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return;
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}
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tbl = page_to_virt(page);
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tbl[idx % TCES_PER_PAGE] = tce;
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}
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static void kvmppc_clear_tce(struct mm_struct *mm, struct iommu_table *tbl,
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unsigned long entry)
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{
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unsigned long hpa = 0;
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enum dma_data_direction dir = DMA_NONE;
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iommu_tce_xchg_no_kill(mm, tbl, entry, &hpa, &dir);
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}
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static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm,
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struct iommu_table *tbl, unsigned long entry)
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{
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struct mm_iommu_table_group_mem_t *mem = NULL;
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const unsigned long pgsize = 1ULL << tbl->it_page_shift;
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__be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry);
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if (!pua)
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return H_SUCCESS;
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mem = mm_iommu_lookup(kvm->mm, be64_to_cpu(*pua), pgsize);
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if (!mem)
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return H_TOO_HARD;
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mm_iommu_mapped_dec(mem);
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*pua = cpu_to_be64(0);
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return H_SUCCESS;
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}
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static long kvmppc_tce_iommu_do_unmap(struct kvm *kvm,
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struct iommu_table *tbl, unsigned long entry)
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{
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enum dma_data_direction dir = DMA_NONE;
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unsigned long hpa = 0;
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long ret;
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if (WARN_ON_ONCE(iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa,
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&dir)))
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return H_TOO_HARD;
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if (dir == DMA_NONE)
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return H_SUCCESS;
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ret = kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry);
|
|
if (ret != H_SUCCESS)
|
|
iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static long kvmppc_tce_iommu_unmap(struct kvm *kvm,
|
|
struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl,
|
|
unsigned long entry)
|
|
{
|
|
unsigned long i, ret = H_SUCCESS;
|
|
unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift);
|
|
unsigned long io_entry = entry * subpages;
|
|
|
|
for (i = 0; i < subpages; ++i) {
|
|
ret = kvmppc_tce_iommu_do_unmap(kvm, tbl, io_entry + i);
|
|
if (ret != H_SUCCESS)
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static long kvmppc_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl,
|
|
unsigned long entry, unsigned long ua,
|
|
enum dma_data_direction dir)
|
|
{
|
|
long ret;
|
|
unsigned long hpa;
|
|
__be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
|
|
struct mm_iommu_table_group_mem_t *mem;
|
|
|
|
if (!pua)
|
|
/* it_userspace allocation might be delayed */
|
|
return H_TOO_HARD;
|
|
|
|
mem = mm_iommu_lookup(kvm->mm, ua, 1ULL << tbl->it_page_shift);
|
|
if (!mem)
|
|
/* This only handles v2 IOMMU type, v1 is handled via ioctl() */
|
|
return H_TOO_HARD;
|
|
|
|
if (WARN_ON_ONCE(mm_iommu_ua_to_hpa(mem, ua, tbl->it_page_shift, &hpa)))
|
|
return H_TOO_HARD;
|
|
|
|
if (mm_iommu_mapped_inc(mem))
|
|
return H_TOO_HARD;
|
|
|
|
ret = iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir);
|
|
if (WARN_ON_ONCE(ret)) {
|
|
mm_iommu_mapped_dec(mem);
|
|
return H_TOO_HARD;
|
|
}
|
|
|
|
if (dir != DMA_NONE)
|
|
kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry);
|
|
|
|
*pua = cpu_to_be64(ua);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long kvmppc_tce_iommu_map(struct kvm *kvm,
|
|
struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl,
|
|
unsigned long entry, unsigned long ua,
|
|
enum dma_data_direction dir)
|
|
{
|
|
unsigned long i, pgoff, ret = H_SUCCESS;
|
|
unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift);
|
|
unsigned long io_entry = entry * subpages;
|
|
|
|
for (i = 0, pgoff = 0; i < subpages;
|
|
++i, pgoff += IOMMU_PAGE_SIZE(tbl)) {
|
|
|
|
ret = kvmppc_tce_iommu_do_map(kvm, tbl,
|
|
io_entry + i, ua + pgoff, dir);
|
|
if (ret != H_SUCCESS)
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
|
|
unsigned long ioba, unsigned long tce)
|
|
{
|
|
struct kvmppc_spapr_tce_table *stt;
|
|
long ret, idx;
|
|
struct kvmppc_spapr_tce_iommu_table *stit;
|
|
unsigned long entry, ua = 0;
|
|
enum dma_data_direction dir;
|
|
|
|
/* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
|
|
/* liobn, ioba, tce); */
|
|
|
|
stt = kvmppc_find_table(vcpu->kvm, liobn);
|
|
if (!stt)
|
|
return H_TOO_HARD;
|
|
|
|
ret = kvmppc_ioba_validate(stt, ioba, 1);
|
|
if (ret != H_SUCCESS)
|
|
return ret;
|
|
|
|
idx = srcu_read_lock(&vcpu->kvm->srcu);
|
|
|
|
ret = kvmppc_tce_validate(stt, tce);
|
|
if (ret != H_SUCCESS)
|
|
goto unlock_exit;
|
|
|
|
dir = iommu_tce_direction(tce);
|
|
|
|
if ((dir != DMA_NONE) && kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) {
|
|
ret = H_PARAMETER;
|
|
goto unlock_exit;
|
|
}
|
|
|
|
entry = ioba >> stt->page_shift;
|
|
|
|
list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
|
|
if (dir == DMA_NONE)
|
|
ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt,
|
|
stit->tbl, entry);
|
|
else
|
|
ret = kvmppc_tce_iommu_map(vcpu->kvm, stt, stit->tbl,
|
|
entry, ua, dir);
|
|
|
|
iommu_tce_kill(stit->tbl, entry, 1);
|
|
|
|
if (ret != H_SUCCESS) {
|
|
kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, entry);
|
|
goto unlock_exit;
|
|
}
|
|
}
|
|
|
|
kvmppc_tce_put(stt, entry, tce);
|
|
|
|
unlock_exit:
|
|
srcu_read_unlock(&vcpu->kvm->srcu, idx);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvmppc_h_put_tce);
|
|
|
|
long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
|
|
unsigned long liobn, unsigned long ioba,
|
|
unsigned long tce_list, unsigned long npages)
|
|
{
|
|
struct kvmppc_spapr_tce_table *stt;
|
|
long i, ret = H_SUCCESS, idx;
|
|
unsigned long entry, ua = 0;
|
|
u64 __user *tces;
|
|
u64 tce;
|
|
struct kvmppc_spapr_tce_iommu_table *stit;
|
|
|
|
stt = kvmppc_find_table(vcpu->kvm, liobn);
|
|
if (!stt)
|
|
return H_TOO_HARD;
|
|
|
|
entry = ioba >> stt->page_shift;
|
|
/*
|
|
* SPAPR spec says that the maximum size of the list is 512 TCEs
|
|
* so the whole table fits in 4K page
|
|
*/
|
|
if (npages > 512)
|
|
return H_PARAMETER;
|
|
|
|
if (tce_list & (SZ_4K - 1))
|
|
return H_PARAMETER;
|
|
|
|
ret = kvmppc_ioba_validate(stt, ioba, npages);
|
|
if (ret != H_SUCCESS)
|
|
return ret;
|
|
|
|
idx = srcu_read_lock(&vcpu->kvm->srcu);
|
|
if (kvmppc_tce_to_ua(vcpu->kvm, tce_list, &ua)) {
|
|
ret = H_TOO_HARD;
|
|
goto unlock_exit;
|
|
}
|
|
tces = (u64 __user *) ua;
|
|
|
|
for (i = 0; i < npages; ++i) {
|
|
if (get_user(tce, tces + i)) {
|
|
ret = H_TOO_HARD;
|
|
goto unlock_exit;
|
|
}
|
|
tce = be64_to_cpu(tce);
|
|
|
|
ret = kvmppc_tce_validate(stt, tce);
|
|
if (ret != H_SUCCESS)
|
|
goto unlock_exit;
|
|
}
|
|
|
|
for (i = 0; i < npages; ++i) {
|
|
/*
|
|
* This looks unsafe, because we validate, then regrab
|
|
* the TCE from userspace which could have been changed by
|
|
* another thread.
|
|
*
|
|
* But it actually is safe, because the relevant checks will be
|
|
* re-executed in the following code. If userspace tries to
|
|
* change this dodgily it will result in a messier failure mode
|
|
* but won't threaten the host.
|
|
*/
|
|
if (get_user(tce, tces + i)) {
|
|
ret = H_TOO_HARD;
|
|
goto invalidate_exit;
|
|
}
|
|
tce = be64_to_cpu(tce);
|
|
|
|
if (kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) {
|
|
ret = H_PARAMETER;
|
|
goto invalidate_exit;
|
|
}
|
|
|
|
list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
|
|
ret = kvmppc_tce_iommu_map(vcpu->kvm, stt,
|
|
stit->tbl, entry + i, ua,
|
|
iommu_tce_direction(tce));
|
|
|
|
if (ret != H_SUCCESS) {
|
|
kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl,
|
|
entry);
|
|
goto invalidate_exit;
|
|
}
|
|
}
|
|
|
|
kvmppc_tce_put(stt, entry + i, tce);
|
|
}
|
|
|
|
invalidate_exit:
|
|
list_for_each_entry_lockless(stit, &stt->iommu_tables, next)
|
|
iommu_tce_kill(stit->tbl, entry, npages);
|
|
|
|
unlock_exit:
|
|
srcu_read_unlock(&vcpu->kvm->srcu, idx);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect);
|
|
|
|
long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
|
|
unsigned long liobn, unsigned long ioba,
|
|
unsigned long tce_value, unsigned long npages)
|
|
{
|
|
struct kvmppc_spapr_tce_table *stt;
|
|
long i, ret;
|
|
struct kvmppc_spapr_tce_iommu_table *stit;
|
|
|
|
stt = kvmppc_find_table(vcpu->kvm, liobn);
|
|
if (!stt)
|
|
return H_TOO_HARD;
|
|
|
|
ret = kvmppc_ioba_validate(stt, ioba, npages);
|
|
if (ret != H_SUCCESS)
|
|
return ret;
|
|
|
|
/* Check permission bits only to allow userspace poison TCE for debug */
|
|
if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ))
|
|
return H_PARAMETER;
|
|
|
|
list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
|
|
unsigned long entry = ioba >> stt->page_shift;
|
|
|
|
for (i = 0; i < npages; ++i) {
|
|
ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt,
|
|
stit->tbl, entry + i);
|
|
|
|
if (ret == H_SUCCESS)
|
|
continue;
|
|
|
|
if (ret == H_TOO_HARD)
|
|
goto invalidate_exit;
|
|
|
|
WARN_ON_ONCE(1);
|
|
kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, entry);
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
|
|
kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value);
|
|
|
|
invalidate_exit:
|
|
list_for_each_entry_lockless(stit, &stt->iommu_tables, next)
|
|
iommu_tce_kill(stit->tbl, ioba >> stt->page_shift, npages);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce);
|