xen: make grant table arch portable
Isaku Yamahata [Wed, 2 Apr 2008 17:54:00 +0000 (10:54 -0700)]
split out x86 specific part from grant-table.c and
allow ia64/xen specific initialization.
ia64/xen grant table is based on pseudo physical address
(guest physical address) unlike x86/xen. On ia64 init_mm
doesn't map identity straight mapped area.
ia64/xen specific grant table initialization is necessary.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/xen/Makefile
arch/x86/xen/grant-table.c [new file with mode: 0644]
drivers/xen/grant-table.c
include/xen/grant_table.h

index 95c5926..3d8df98 100644 (file)
@@ -1,4 +1,4 @@
 obj-y          := enlighten.o setup.o multicalls.o mmu.o \
-                       time.o manage.o xen-asm.o
+                       time.o manage.o xen-asm.o grant-table.o
 
 obj-$(CONFIG_SMP)      += smp.o
diff --git a/arch/x86/xen/grant-table.c b/arch/x86/xen/grant-table.c
new file mode 100644 (file)
index 0000000..49ba9b5
--- /dev/null
@@ -0,0 +1,91 @@
+/******************************************************************************
+ * grant_table.c
+ * x86 specific part
+ *
+ * Granting foreign access to our memory reservation.
+ *
+ * Copyright (c) 2005-2006, Christopher Clark
+ * Copyright (c) 2004-2005, K A Fraser
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan. Split out x86 specific part.
+ *
+ * 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; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+
+#include <xen/interface/xen.h>
+#include <xen/page.h>
+#include <xen/grant_table.h>
+
+#include <asm/pgtable.h>
+
+static int map_pte_fn(pte_t *pte, struct page *pmd_page,
+                     unsigned long addr, void *data)
+{
+       unsigned long **frames = (unsigned long **)data;
+
+       set_pte_at(&init_mm, addr, pte, mfn_pte((*frames)[0], PAGE_KERNEL));
+       (*frames)++;
+       return 0;
+}
+
+static int unmap_pte_fn(pte_t *pte, struct page *pmd_page,
+                       unsigned long addr, void *data)
+{
+
+       set_pte_at(&init_mm, addr, pte, __pte(0));
+       return 0;
+}
+
+int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
+                          unsigned long max_nr_gframes,
+                          struct grant_entry **__shared)
+{
+       int rc;
+       struct grant_entry *shared = *__shared;
+
+       if (shared == NULL) {
+               struct vm_struct *area =
+                       xen_alloc_vm_area(PAGE_SIZE * max_nr_gframes);
+               BUG_ON(area == NULL);
+               shared = area->addr;
+               *__shared = shared;
+       }
+
+       rc = apply_to_page_range(&init_mm, (unsigned long)shared,
+                                PAGE_SIZE * nr_gframes,
+                                map_pte_fn, &frames);
+       return rc;
+}
+
+void arch_gnttab_unmap_shared(struct grant_entry *shared,
+                             unsigned long nr_gframes)
+{
+       apply_to_page_range(&init_mm, (unsigned long)shared,
+                           PAGE_SIZE * nr_gframes, unmap_pte_fn, NULL);
+}
index 3e02808..52b6b41 100644 (file)
@@ -439,24 +439,6 @@ static inline unsigned int max_nr_grant_frames(void)
        return xen_max;
 }
 
-static int map_pte_fn(pte_t *pte, struct page *pmd_page,
-                     unsigned long addr, void *data)
-{
-       unsigned long **frames = (unsigned long **)data;
-
-       set_pte_at(&init_mm, addr, pte, mfn_pte((*frames)[0], PAGE_KERNEL));
-       (*frames)++;
-       return 0;
-}
-
-static int unmap_pte_fn(pte_t *pte, struct page *pmd_page,
-                       unsigned long addr, void *data)
-{
-
-       set_pte_at(&init_mm, addr, pte, __pte(0));
-       return 0;
-}
-
 static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
 {
        struct gnttab_setup_table setup;
@@ -480,17 +462,9 @@ static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
 
        BUG_ON(rc || setup.status);
 
-       if (shared == NULL) {
-               struct vm_struct *area;
-               area = xen_alloc_vm_area(PAGE_SIZE * max_nr_grant_frames());
-               BUG_ON(area == NULL);
-               shared = area->addr;
-       }
-       rc = apply_to_page_range(&init_mm, (unsigned long)shared,
-                                PAGE_SIZE * nr_gframes,
-                                map_pte_fn, &frames);
+       rc = arch_gnttab_map_shared(frames, nr_gframes, max_nr_grant_frames(),
+                                   &shared);
        BUG_ON(rc);
-       frames -= nr_gframes; /* adjust after map_pte_fn() */
 
        kfree(frames);
 
@@ -506,10 +480,7 @@ static int gnttab_resume(void)
 
 static int gnttab_suspend(void)
 {
-       apply_to_page_range(&init_mm, (unsigned long)shared,
-                           PAGE_SIZE * nr_grant_frames,
-                           unmap_pte_fn, NULL);
-
+       arch_gnttab_unmap_shared(shared, nr_grant_frames);
        return 0;
 }
 
index d282292..4662048 100644 (file)
@@ -103,6 +103,12 @@ void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
 void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
                                       unsigned long pfn);
 
+int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
+                          unsigned long max_nr_gframes,
+                          struct grant_entry **__shared);
+void arch_gnttab_unmap_shared(struct grant_entry *shared,
+                             unsigned long nr_gframes);
+
 #define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))
 
 #endif /* __ASM_GNTTAB_H__ */