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-rw-r--r--drivers/xen/privcmd.c117
-rw-r--r--drivers/xen/xlate_mmu.c46
2 files changed, 110 insertions, 53 deletions
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 59ac71c4a043..5a296161d843 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -159,6 +159,40 @@ static int traverse_pages(unsigned nelem, size_t size,
return ret;
}
+/*
+ * Similar to traverse_pages, but use each page as a "block" of
+ * data to be processed as one unit.
+ */
+static int traverse_pages_block(unsigned nelem, size_t size,
+ struct list_head *pos,
+ int (*fn)(void *data, int nr, void *state),
+ void *state)
+{
+ void *pagedata;
+ unsigned pageidx;
+ int ret = 0;
+
+ BUG_ON(size > PAGE_SIZE);
+
+ pageidx = PAGE_SIZE;
+
+ while (nelem) {
+ int nr = (PAGE_SIZE/size);
+ struct page *page;
+ if (nr > nelem)
+ nr = nelem;
+ pos = pos->next;
+ page = list_entry(pos, struct page, lru);
+ pagedata = page_address(page);
+ ret = (*fn)(pagedata, nr, state);
+ if (ret)
+ break;
+ nelem -= nr;
+ }
+
+ return ret;
+}
+
struct mmap_mfn_state {
unsigned long va;
struct vm_area_struct *vma;
@@ -274,39 +308,25 @@ struct mmap_batch_state {
/* auto translated dom0 note: if domU being created is PV, then mfn is
* mfn(addr on bus). If it's auto xlated, then mfn is pfn (input to HAP).
*/
-static int mmap_batch_fn(void *data, void *state)
+static int mmap_batch_fn(void *data, int nr, void *state)
{
xen_pfn_t *mfnp = data;
struct mmap_batch_state *st = state;
struct vm_area_struct *vma = st->vma;
struct page **pages = vma->vm_private_data;
- struct page *cur_page = NULL;
+ struct page **cur_pages = NULL;
int ret;
if (xen_feature(XENFEAT_auto_translated_physmap))
- cur_page = pages[st->index++];
+ cur_pages = &pages[st->index];
- ret = xen_remap_domain_mfn_range(st->vma, st->va & PAGE_MASK, *mfnp, 1,
- st->vma->vm_page_prot, st->domain,
- &cur_page);
+ BUG_ON(nr < 0);
+ ret = xen_remap_domain_mfn_array(st->vma, st->va & PAGE_MASK, mfnp, nr,
+ (int *)mfnp, st->vma->vm_page_prot,
+ st->domain, cur_pages);
- /* Store error code for second pass. */
- if (st->version == 1) {
- if (ret < 0) {
- /*
- * V1 encodes the error codes in the 32bit top nibble of the
- * mfn (with its known limitations vis-a-vis 64 bit callers).
- */
- *mfnp |= (ret == -ENOENT) ?
- PRIVCMD_MMAPBATCH_PAGED_ERROR :
- PRIVCMD_MMAPBATCH_MFN_ERROR;
- }
- } else { /* st->version == 2 */
- *((int *) mfnp) = ret;
- }
-
- /* And see if it affects the global_error. */
- if (ret < 0) {
+ /* Adjust the global_error? */
+ if (ret != nr) {
if (ret == -ENOENT)
st->global_error = -ENOENT;
else {
@@ -315,23 +335,35 @@ static int mmap_batch_fn(void *data, void *state)
st->global_error = 1;
}
}
- st->va += PAGE_SIZE;
+ st->va += PAGE_SIZE * nr;
+ st->index += nr;
return 0;
}
-static int mmap_return_errors(void *data, void *state)
+static int mmap_return_error(int err, struct mmap_batch_state *st)
{
- struct mmap_batch_state *st = state;
+ int ret;
if (st->version == 1) {
- xen_pfn_t mfnp = *((xen_pfn_t *) data);
- if (mfnp & PRIVCMD_MMAPBATCH_MFN_ERROR)
- return __put_user(mfnp, st->user_mfn++);
- else
+ if (err) {
+ xen_pfn_t mfn;
+
+ ret = get_user(mfn, st->user_mfn);
+ if (ret < 0)
+ return ret;
+ /*
+ * V1 encodes the error codes in the 32bit top
+ * nibble of the mfn (with its known
+ * limitations vis-a-vis 64 bit callers).
+ */
+ mfn |= (err == -ENOENT) ?
+ PRIVCMD_MMAPBATCH_PAGED_ERROR :
+ PRIVCMD_MMAPBATCH_MFN_ERROR;
+ return __put_user(mfn, st->user_mfn++);
+ } else
st->user_mfn++;
} else { /* st->version == 2 */
- int err = *((int *) data);
if (err)
return __put_user(err, st->user_err++);
else
@@ -341,6 +373,21 @@ static int mmap_return_errors(void *data, void *state)
return 0;
}
+static int mmap_return_errors(void *data, int nr, void *state)
+{
+ struct mmap_batch_state *st = state;
+ int *errs = data;
+ int i;
+ int ret;
+
+ for (i = 0; i < nr; i++) {
+ ret = mmap_return_error(errs[i], st);
+ if (ret < 0)
+ return ret;
+ }
+ return 0;
+}
+
/* Allocate pfns that are then mapped with gmfns from foreign domid. Update
* the vma with the page info to use later.
* Returns: 0 if success, otherwise -errno
@@ -472,8 +519,8 @@ static long privcmd_ioctl_mmap_batch(void __user *udata, int version)
state.version = version;
/* mmap_batch_fn guarantees ret == 0 */
- BUG_ON(traverse_pages(m.num, sizeof(xen_pfn_t),
- &pagelist, mmap_batch_fn, &state));
+ BUG_ON(traverse_pages_block(m.num, sizeof(xen_pfn_t),
+ &pagelist, mmap_batch_fn, &state));
up_write(&mm->mmap_sem);
@@ -481,8 +528,8 @@ static long privcmd_ioctl_mmap_batch(void __user *udata, int version)
/* Write back errors in second pass. */
state.user_mfn = (xen_pfn_t *)m.arr;
state.user_err = m.err;
- ret = traverse_pages(m.num, sizeof(xen_pfn_t),
- &pagelist, mmap_return_errors, &state);
+ ret = traverse_pages_block(m.num, sizeof(xen_pfn_t),
+ &pagelist, mmap_return_errors, &state);
} else
ret = 0;
diff --git a/drivers/xen/xlate_mmu.c b/drivers/xen/xlate_mmu.c
index 7724d90fc697..58a5389aec89 100644
--- a/drivers/xen/xlate_mmu.c
+++ b/drivers/xen/xlate_mmu.c
@@ -62,13 +62,15 @@ static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
}
struct remap_data {
- xen_pfn_t fgmfn; /* foreign domain's gmfn */
+ xen_pfn_t *fgmfn; /* foreign domain's gmfn */
pgprot_t prot;
domid_t domid;
struct vm_area_struct *vma;
int index;
struct page **pages;
struct xen_remap_mfn_info *info;
+ int *err_ptr;
+ int mapped;
};
static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
@@ -80,38 +82,46 @@ static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
pte_t pte = pte_mkspecial(pfn_pte(pfn, info->prot));
int rc;
- rc = map_foreign_page(pfn, info->fgmfn, info->domid);
- if (rc < 0)
- return rc;
- set_pte_at(info->vma->vm_mm, addr, ptep, pte);
+ rc = map_foreign_page(pfn, *info->fgmfn, info->domid);
+ *info->err_ptr++ = rc;
+ if (!rc) {
+ set_pte_at(info->vma->vm_mm, addr, ptep, pte);
+ info->mapped++;
+ }
+ info->fgmfn++;
return 0;
}
-int xen_xlate_remap_gfn_range(struct vm_area_struct *vma,
+int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
unsigned long addr,
- xen_pfn_t gfn, int nr,
- pgprot_t prot, unsigned domid,
+ xen_pfn_t *mfn, int nr,
+ int *err_ptr, pgprot_t prot,
+ unsigned domid,
struct page **pages)
{
int err;
struct remap_data data;
+ unsigned long range = nr << PAGE_SHIFT;
- /* TBD: Batching, current sole caller only does page at a time */
- if (nr > 1)
- return -EINVAL;
+ /* Kept here for the purpose of making sure code doesn't break
+ x86 PVOPS */
+ BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_IO)) == (VM_PFNMAP | VM_IO)));
- data.fgmfn = gfn;
- data.prot = prot;
+ data.fgmfn = mfn;
+ data.prot = prot;
data.domid = domid;
- data.vma = vma;
- data.index = 0;
+ data.vma = vma;
data.pages = pages;
- err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT,
+ data.index = 0;
+ data.err_ptr = err_ptr;
+ data.mapped = 0;
+
+ err = apply_to_page_range(vma->vm_mm, addr, range,
remap_pte_fn, &data);
- return err;
+ return err < 0 ? err : data.mapped;
}
-EXPORT_SYMBOL_GPL(xen_xlate_remap_gfn_range);
+EXPORT_SYMBOL_GPL(xen_xlate_remap_gfn_array);
int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
int nr, struct page **pages)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-21 14:41:31 +0000