*
* Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
* Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com>
+ * Copyright 2016 Alexey Kardashevskiy, IBM Corporation <aik@au1.ibm.com>
*/
#include <linux/types.h>
#include <asm/ppc-opcode.h>
#include <asm/kvm_host.h>
#include <asm/udbg.h>
+#include <asm/iommu.h>
+#include <asm/tce.h>
-#define TCES_PER_PAGE (PAGE_SIZE / sizeof(u64))
+static unsigned long kvmppc_tce_pages(unsigned long iommu_pages)
+{
+ return ALIGN(iommu_pages * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
+}
-static long kvmppc_stt_npages(unsigned long window_size)
+static unsigned long kvmppc_stt_pages(unsigned long tce_pages)
{
- return ALIGN((window_size >> SPAPR_TCE_SHIFT)
- * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
+ unsigned long stt_bytes = sizeof(struct kvmppc_spapr_tce_table) +
+ (tce_pages * sizeof(struct page *));
+
+ return tce_pages + ALIGN(stt_bytes, PAGE_SIZE) / PAGE_SIZE;
}
-static void release_spapr_tce_table(struct kvmppc_spapr_tce_table *stt)
+static long kvmppc_account_memlimit(unsigned long stt_pages, bool inc)
{
- struct kvm *kvm = stt->kvm;
- int i;
+ long ret = 0;
- mutex_lock(&kvm->lock);
- list_del(&stt->list);
- for (i = 0; i < kvmppc_stt_npages(stt->window_size); i++)
+ if (!current || !current->mm)
+ return ret; /* process exited */
+
+ down_write(¤t->mm->mmap_sem);
+
+ if (inc) {
+ unsigned long locked, lock_limit;
+
+ locked = current->mm->locked_vm + stt_pages;
+ lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+ if (locked > lock_limit && !capable(CAP_IPC_LOCK))
+ ret = -ENOMEM;
+ else
+ current->mm->locked_vm += stt_pages;
+ } else {
+ if (WARN_ON_ONCE(stt_pages > current->mm->locked_vm))
+ stt_pages = current->mm->locked_vm;
+
+ current->mm->locked_vm -= stt_pages;
+ }
+
+ pr_debug("[%d] RLIMIT_MEMLOCK KVM %c%ld %ld/%ld%s\n", current->pid,
+ inc ? '+' : '-',
+ stt_pages << PAGE_SHIFT,
+ current->mm->locked_vm << PAGE_SHIFT,
+ rlimit(RLIMIT_MEMLOCK),
+ ret ? " - exceeded" : "");
+
+ up_write(¤t->mm->mmap_sem);
+
+ return ret;
+}
+
+static void release_spapr_tce_table(struct rcu_head *head)
+{
+ struct kvmppc_spapr_tce_table *stt = container_of(head,
+ struct kvmppc_spapr_tce_table, rcu);
+ unsigned long i, npages = kvmppc_tce_pages(stt->size);
+
+ for (i = 0; i < npages; i++)
__free_page(stt->pages[i]);
- kfree(stt);
- mutex_unlock(&kvm->lock);
- kvm_put_kvm(kvm);
+ kfree(stt);
}
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))
+ if (vmf->pgoff >= kvmppc_tce_pages(stt->size))
return VM_FAULT_SIGBUS;
page = stt->pages[vmf->pgoff];
{
struct kvmppc_spapr_tce_table *stt = filp->private_data;
- release_spapr_tce_table(stt);
+ list_del_rcu(&stt->list);
+
+ kvm_put_kvm(stt->kvm);
+
+ kvmppc_account_memlimit(
+ kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false);
+ call_rcu(&stt->rcu, release_spapr_tce_table);
+
return 0;
}
};
long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
- struct kvm_create_spapr_tce *args)
+ struct kvm_create_spapr_tce_64 *args)
{
struct kvmppc_spapr_tce_table *stt = NULL;
- long npages;
+ unsigned long npages, size;
int ret = -ENOMEM;
int i;
+ if (!args->size)
+ return -EINVAL;
+
/* 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);
+ size = args->size;
+ npages = kvmppc_tce_pages(size);
+ ret = kvmppc_account_memlimit(kvmppc_stt_pages(npages), true);
+ if (ret) {
+ stt = NULL;
+ goto fail;
+ }
stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *),
GFP_KERNEL);
goto fail;
stt->liobn = args->liobn;
- stt->window_size = args->window_size;
+ stt->page_shift = args->page_shift;
+ stt->offset = args->offset;
+ stt->size = size;
stt->kvm = kvm;
for (i = 0; i < npages; i++) {
kvm_get_kvm(kvm);
mutex_lock(&kvm->lock);
- list_add(&stt->list, &kvm->arch.spapr_tce_tables);
+ list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables);
mutex_unlock(&kvm->lock);
}
return ret;
}
+
+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, tce;
+
+ stt = kvmppc_find_table(vcpu, 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_gpa_to_ua(vcpu->kvm, tce_list, &ua, NULL)) {
+ 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;
+
+ kvmppc_tce_put(stt, entry + i, tce);
+ }
+
+unlock_exit:
+ srcu_read_unlock(&vcpu->kvm->srcu, idx);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(kvmppc_h_put_tce_indirect);
projects / karo-tx-linux.git / blobdiff