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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [IA64] linux: privcmd_mmap() and direct_remap_pfn_range()
# HG changeset patch
# User awilliam@xxxxxxxxxxx
# Node ID e891c49c7bc003755ae8a190a654af7dc958d547
# Parent fc75a2c9835e644ec3962fb50b122173ae0b5122
[IA64] linux: privcmd_mmap() and direct_remap_pfn_range()
implemented direct_remap_pfn_range() and ia64-specific privcmd_mmap()
for foreing domain page mapping.
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
linux-2.6-xen-sparse/arch/ia64/xen/hypervisor.c | 281 +++++++++++++++++++++
linux-2.6-xen-sparse/include/asm-ia64/hypervisor.h | 13
2 files changed, 293 insertions(+), 1 deletion(-)
diff -r fc75a2c9835e -r e891c49c7bc0
linux-2.6-xen-sparse/arch/ia64/xen/hypervisor.c
--- a/linux-2.6-xen-sparse/arch/ia64/xen/hypervisor.c Tue May 09 11:42:26
2006 -0600
+++ b/linux-2.6-xen-sparse/arch/ia64/xen/hypervisor.c Tue May 09 11:44:26
2006 -0600
@@ -290,3 +290,284 @@ EXPORT_SYMBOL(balloon_update_driver_allo
struct address_space xen_ia64_foreign_dummy_mapping;
+///////////////////////////////////////////////////////////////////////////
+// foreign mapping
+
+struct xen_ia64_privcmd_entry {
+ atomic_t map_count;
+ struct page* page;
+ unsigned long mfn;
+};
+
+static void
+xen_ia64_privcmd_init_entry(struct xen_ia64_privcmd_entry* entry)
+{
+ atomic_set(&entry->map_count, 0);
+ entry->page = NULL;
+ entry->mfn = INVALID_MFN;
+}
+
+static int
+xen_ia64_privcmd_entry_mmap(struct vm_area_struct* vma,
+ unsigned long addr,
+ struct xen_ia64_privcmd_entry* entry,
+ unsigned long mfn,
+ pgprot_t prot,
+ domid_t domid)
+{
+ int error = 0;
+ struct page* page;
+ unsigned long gpfn;
+
+ BUG_ON((addr & ~PAGE_MASK) != 0);
+ BUG_ON(mfn == INVALID_MFN);
+
+ if (entry->page != NULL) {
+ error = -EBUSY;
+ goto out;
+ }
+ page = alloc_page(GFP_KERNEL);
+ if (page == NULL) {
+ error = -ENOMEM;
+ goto out;
+ }
+ gpfn = page_to_pfn(page);
+
+ error = HYPERVISOR_add_physmap(gpfn, mfn, 0/* prot:XXX */,
+ domid);
+ if (error != 0) {
+ goto out;
+ }
+
+ prot = vma->vm_page_prot;
+ error = remap_pfn_range(vma, addr, gpfn, 1 << PAGE_SHIFT, prot);
+ if (error != 0) {
+ (void)HYPERVISOR_zap_physmap(gpfn, 0);
+ error = HYPERVISOR_populate_physmap(gpfn, 0, 0);
+ if (error) {
+ BUG();//XXX
+ }
+ __free_page(page);
+ } else {
+ atomic_inc(&entry->map_count);
+ entry->page = page;
+ entry->mfn = mfn;
+ }
+
+out:
+ return error;
+}
+
+static void
+xen_ia64_privcmd_entry_munmap(struct xen_ia64_privcmd_entry* entry)
+{
+ struct page* page = entry->page;
+ unsigned long gpfn = page_to_pfn(page);
+ int error;
+
+ error = HYPERVISOR_zap_physmap(gpfn, 0);
+ if (error) {
+ BUG();//XXX
+ }
+
+ error = HYPERVISOR_populate_physmap(gpfn, 0, 0);
+ if (error) {
+ BUG();//XXX
+ }
+
+ entry->page = NULL;
+ entry->mfn = INVALID_MFN;
+ __free_page(page);
+}
+
+static int
+xen_ia64_privcmd_entry_open(struct xen_ia64_privcmd_entry* entry)
+{
+ if (entry->page != NULL) {
+ atomic_inc(&entry->map_count);
+ } else {
+ BUG_ON(atomic_read(&entry->map_count) != 0);
+ }
+}
+
+static int
+xen_ia64_privcmd_entry_close(struct xen_ia64_privcmd_entry* entry)
+{
+ if (entry->page != NULL && atomic_dec_and_test(&entry->map_count)) {
+ xen_ia64_privcmd_entry_munmap(entry);
+ }
+}
+
+struct xen_ia64_privcmd_file {
+ struct file* file;
+ atomic_t map_count;
+ unsigned long pgoff; // in PAGE_SIZE
+
+ unsigned long num_entries;
+ struct xen_ia64_privcmd_entry entries[0];
+};
+
+struct xen_ia64_privcmd_vma {
+ struct xen_ia64_privcmd_file* file;
+ unsigned long num_entries;
+ struct xen_ia64_privcmd_entry* entries;
+};
+
+static void xen_ia64_privcmd_vma_open(struct vm_area_struct* vma);
+static void xen_ia64_privcmd_vma_close(struct vm_area_struct* vma);
+
+struct vm_operations_struct xen_ia64_privcmd_vm_ops = {
+ .open = &xen_ia64_privcmd_vma_open,
+ .close = &xen_ia64_privcmd_vma_close,
+};
+
+static void
+__xen_ia64_privcmd_vma_open(struct vm_area_struct* vma,
+ struct xen_ia64_privcmd_vma* privcmd_vma)
+{
+ struct xen_ia64_privcmd_file* privcmd_file =
+ (struct xen_ia64_privcmd_file*)vma->vm_file->private_data;
+ unsigned long entry_offset = vma->vm_pgoff - privcmd_file->pgoff;
+ unsigned long num_entries = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+ unsigned long i;
+
+ BUG_ON(entry_offset < 0);
+ BUG_ON(entry_offset + num_entries > privcmd_file->num_entries);
+
+ privcmd_vma->file = privcmd_file;
+ privcmd_vma->num_entries = num_entries;
+ privcmd_vma->entries = &privcmd_file->entries[entry_offset];
+ vma->vm_private_data = privcmd_vma;
+ for (i = 0; i < privcmd_vma->num_entries; i++) {
+ xen_ia64_privcmd_entry_open(&privcmd_vma->entries[i]);
+ }
+
+ vma->vm_private_data = privcmd_vma;
+ vma->vm_ops = &xen_ia64_privcmd_vm_ops;
+}
+
+static void
+xen_ia64_privcmd_vma_open(struct vm_area_struct* vma)
+{
+ struct xen_ia64_privcmd_file* privcmd_file =
+ (struct xen_ia64_privcmd_file*)vma->vm_file->private_data;
+ struct xen_ia64_privcmd_vma* privcmd_vma;
+
+ atomic_inc(&privcmd_file->map_count);
+ // vm_op->open() can't fail.
+ privcmd_vma = kmalloc(sizeof(*privcmd_vma), GFP_KERNEL | __GFP_NOFAIL);
+
+ __xen_ia64_privcmd_vma_open(vma, privcmd_vma);
+}
+
+static void
+xen_ia64_privcmd_vma_close(struct vm_area_struct* vma)
+{
+ struct xen_ia64_privcmd_vma* privcmd_vma =
+ (struct xen_ia64_privcmd_vma*)vma->vm_private_data;
+ struct xen_ia64_privcmd_file* privcmd_file = privcmd_vma->file;
+ unsigned long i;
+
+ for (i = 0; i < privcmd_vma->num_entries; i++) {
+ xen_ia64_privcmd_entry_close(&privcmd_vma->entries[i]);
+ }
+ vma->vm_private_data = NULL;
+ kfree(privcmd_vma);
+
+ if (atomic_dec_and_test(&privcmd_file->map_count)) {
+#if 1
+ for (i = 0; i < privcmd_file->num_entries; i++) {
+ struct xen_ia64_privcmd_entry* entry =
+ &privcmd_vma->entries[i];
+ BUG_ON(atomic_read(&entry->map_count) != 0);
+ BUG_ON(entry->page != NULL);
+ }
+#endif
+ privcmd_file->file->private_data = NULL;
+ kfree(privcmd_file->file->private_data);
+ }
+}
+
+int
+privcmd_mmap(struct file * file, struct vm_area_struct * vma)
+{
+ unsigned long num_entries = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+ struct xen_ia64_privcmd_file* privcmd_file;
+ struct xen_ia64_privcmd_vma* privcmd_vma;
+ unsigned long i;
+ BUG_ON(!running_on_xen);
+
+ /* DONTCOPY is essential for Xen as copy_page_range is broken. */
+ vma->vm_flags |= VM_RESERVED | VM_IO | VM_DONTCOPY;
+
+ if (file->private_data != NULL) {
+ return -EBUSY;
+ }
+
+ privcmd_file = kmalloc(sizeof(*privcmd_file) +
+ sizeof(privcmd_file->entries[0]) * num_entries,
+ GFP_KERNEL);
+ if (privcmd_file == NULL) {
+ goto out_enomem0;
+ }
+ privcmd_vma = kmalloc(sizeof(*privcmd_vma), GFP_KERNEL);
+ if (privcmd_vma == NULL) {
+ goto out_enomem1;
+ }
+
+ atomic_set(&privcmd_file->map_count, 1);
+ privcmd_file->num_entries = num_entries;
+ for (i = 0; i < privcmd_file->num_entries; i++) {
+ xen_ia64_privcmd_init_entry(&privcmd_file->entries[i]);
+ }
+ file->private_data = privcmd_file;
+ privcmd_file->file = file;
+ privcmd_file->pgoff = vma->vm_pgoff;
+
+ __xen_ia64_privcmd_vma_open(vma, privcmd_vma);
+ return 0;
+
+out_enomem1:
+ kfree(privcmd_vma);
+out_enomem0:
+ kfree(privcmd_file);
+ return -ENOMEM;
+}
+
+int
+direct_remap_pfn_range(struct vm_area_struct *vma,
+ unsigned long address, // process virtual address
+ unsigned long mfn, // mfn, mfn + 1, ... mfn +
size/PAGE_SIZE
+ unsigned long size,
+ pgprot_t prot,
+ domid_t domid) // target domain
+{
+ struct xen_ia64_privcmd_vma* privcmd_vma =
+ (struct xen_ia64_privcmd_vma*)vma->vm_private_data;
+ unsigned long i;
+ unsigned long offset;
+ int error = 0;
+ BUG_ON(!running_on_xen);
+
+#if 0
+ if (prot != vm->vm_page_prot) {
+ return -EINVAL;
+ }
+#endif
+
+ i = (address - vma->vm_start) >> PAGE_SHIFT;
+ for (offset = 0; offset < size; offset += PAGE_SIZE) {
+ struct xen_ia64_privcmd_entry* entry =
+ &privcmd_vma->file->entries[i];
+ error = xen_ia64_privcmd_entry_mmap(vma, (address + offset) &
PAGE_MASK, entry, mfn, prot, domid);
+ if (error != 0) {
+ break;
+ }
+
+ i++;
+ mfn++;
+ }
+
+ return error;
+}
+
diff -r fc75a2c9835e -r e891c49c7bc0
linux-2.6-xen-sparse/include/asm-ia64/hypervisor.h
--- a/linux-2.6-xen-sparse/include/asm-ia64/hypervisor.h Tue May 09
11:42:26 2006 -0600
+++ b/linux-2.6-xen-sparse/include/asm-ia64/hypervisor.h Tue May 09
11:44:26 2006 -0600
@@ -118,11 +118,22 @@ HYPERVISOR_poll(
}
// for drivers/xen/privcmd/privcmd.c
-#define direct_remap_pfn_range(a,b,c,d,e,f) remap_pfn_range(a,b,c,d,e)
#define machine_to_phys_mapping 0
#ifndef CONFIG_XEN_IA64_DOM0_VP
+#define direct_remap_pfn_range(a,b,c,d,e,f) remap_pfn_range(a,b,c,d,e)
#define pfn_to_mfn(x) (x)
#define mfn_to_pfn(x) (x)
+#else
+struct vm_area_struct;
+int direct_remap_pfn_range(struct vm_area_struct *vma,
+ unsigned long address,
+ unsigned long mfn,
+ unsigned long size,
+ pgprot_t prot,
+ domid_t domid);
+struct file;
+int privcmd_mmap(struct file * file, struct vm_area_struct * vma);
+#define HAVE_ARCH_PRIVCMD_MMAP
#endif
// for drivers/xen/balloon/balloon.c
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