[Xen-devel] [PATCH v7 02/17] xen/grant-table: Move xlated_setup_gnttab_pages to common place

[Shannon Zhao <shannon.zhao@xxxxxxxxxx>]

Move xlated_setup_gnttab_pages to common place, so it can be reused by
ARM to setup grant table.

Rename it to xen_xlate_map_ballooned_pages.

Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 arch/x86/xen/grant-table.c | 57 +++++--------------------------------------
 drivers/xen/xlate_mmu.c    | 61 ++++++++++++++++++++++++++++++++++++++++++++++
 include/xen/xen-ops.h      |  2 ++
 3 files changed, 69 insertions(+), 51 deletions(-)

diff --git a/arch/x86/xen/grant-table.c b/arch/x86/xen/grant-table.c
index e079500..de4144c 100644
--- a/arch/x86/xen/grant-table.c
+++ b/arch/x86/xen/grant-table.c
@@ -111,63 +111,18 @@ int arch_gnttab_init(unsigned long nr_shared)
 }
 
 #ifdef CONFIG_XEN_PVH
-#include <xen/balloon.h>
 #include <xen/events.h>
-#include <linux/slab.h>
-static int __init xlated_setup_gnttab_pages(void)
-{
-       struct page **pages;
-       xen_pfn_t *pfns;
-       void *vaddr;
-       int rc;
-       unsigned int i;
-       unsigned long nr_grant_frames = gnttab_max_grant_frames();
-
-       BUG_ON(nr_grant_frames == 0);
-       pages = kcalloc(nr_grant_frames, sizeof(pages[0]), GFP_KERNEL);
-       if (!pages)
-               return -ENOMEM;
-
-       pfns = kcalloc(nr_grant_frames, sizeof(pfns[0]), GFP_KERNEL);
-       if (!pfns) {
-               kfree(pages);
-               return -ENOMEM;
-       }
-       rc = alloc_xenballooned_pages(nr_grant_frames, pages);
-       if (rc) {
-               pr_warn("%s Couldn't balloon alloc %ld pfns rc:%d\n", __func__,
-                       nr_grant_frames, rc);
-               kfree(pages);
-               kfree(pfns);
-               return rc;
-       }
-       for (i = 0; i < nr_grant_frames; i++)
-               pfns[i] = page_to_pfn(pages[i]);
-
-       vaddr = vmap(pages, nr_grant_frames, 0, PAGE_KERNEL);
-       if (!vaddr) {
-               pr_warn("%s Couldn't map %ld pfns rc:%d\n", __func__,
-                       nr_grant_frames, rc);
-               free_xenballooned_pages(nr_grant_frames, pages);
-               kfree(pages);
-               kfree(pfns);
-               return -ENOMEM;
-       }
-       kfree(pages);
-
-       xen_auto_xlat_grant_frames.pfn = pfns;
-       xen_auto_xlat_grant_frames.count = nr_grant_frames;
-       xen_auto_xlat_grant_frames.vaddr = vaddr;
-
-       return 0;
-}
-
+#include <xen/xen-ops.h>
 static int __init xen_pvh_gnttab_setup(void)
 {
        if (!xen_pvh_domain())
                return -ENODEV;
 
-       return xlated_setup_gnttab_pages();
+       xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
+
+       return xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
+                                            &xen_auto_xlat_grant_frames.vaddr,
+                                            xen_auto_xlat_grant_frames.count);
 }
 /* Call it _before_ __gnttab_init as we need to initialize the
  * xen_auto_xlat_grant_frames first. */
diff --git a/drivers/xen/xlate_mmu.c b/drivers/xen/xlate_mmu.c
index 5063c5e..9692656 100644
--- a/drivers/xen/xlate_mmu.c
+++ b/drivers/xen/xlate_mmu.c
@@ -29,6 +29,8 @@
  */
 #include <linux/kernel.h>
 #include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
 
 #include <asm/xen/hypercall.h>
 #include <asm/xen/hypervisor.h>
@@ -37,6 +39,7 @@
 #include <xen/page.h>
 #include <xen/interface/xen.h>
 #include <xen/interface/memory.h>
+#include <xen/balloon.h>
 
 typedef void (*xen_gfn_fn_t)(unsigned long gfn, void *data);
 
@@ -185,3 +188,61 @@ int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
        return 0;
 }
 EXPORT_SYMBOL_GPL(xen_xlate_unmap_gfn_range);
+
+/**
+ * xen_xlate_map_ballooned_pages - map a new set of ballooned pages
+ * @gfns: returns the array of corresponding GFNs
+ * @virt: returns the virtual address of the mapped region
+ * @nr_grant_frames: number of GFNs
+ * @return 0 on success, error otherwise
+ *
+ * This allocates a set of ballooned pages and maps them into the
+ * kernel's address space.
+ */
+int __init xen_xlate_map_ballooned_pages(xen_pfn_t **gfns, void **virt,
+                                        unsigned long nr_grant_frames)
+{
+       struct page **pages;
+       xen_pfn_t *pfns;
+       void *vaddr;
+       int rc;
+       unsigned int i;
+
+       BUG_ON(nr_grant_frames == 0);
+       pages = kcalloc(nr_grant_frames, sizeof(pages[0]), GFP_KERNEL);
+       if (!pages)
+               return -ENOMEM;
+
+       pfns = kcalloc(nr_grant_frames, sizeof(pfns[0]), GFP_KERNEL);
+       if (!pfns) {
+               kfree(pages);
+               return -ENOMEM;
+       }
+       rc = alloc_xenballooned_pages(nr_grant_frames, pages);
+       if (rc) {
+               pr_warn("%s Couldn't balloon alloc %ld pfns rc:%d\n", __func__,
+                       nr_grant_frames, rc);
+               kfree(pages);
+               kfree(pfns);
+               return rc;
+       }
+       for (i = 0; i < nr_grant_frames; i++)
+               pfns[i] = page_to_pfn(pages[i]);
+
+       vaddr = vmap(pages, nr_grant_frames, 0, PAGE_KERNEL);
+       if (!vaddr) {
+               pr_warn("%s Couldn't map %ld pfns rc:%d\n", __func__,
+                       nr_grant_frames, rc);
+               free_xenballooned_pages(nr_grant_frames, pages);
+               kfree(pages);
+               kfree(pfns);
+               return -ENOMEM;
+       }
+       kfree(pages);
+
+       *gfns = pfns;
+       *virt = vaddr;
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(xen_xlate_map_ballooned_pages);
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index 86abe07..072be1c 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -85,6 +85,8 @@ int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
                              struct page **pages);
 int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
                              int nr, struct page **pages);
+int xen_xlate_map_ballooned_pages(xen_pfn_t **pfns, void **vaddr,
+                                 unsigned long nr_grant_frames);
 
 bool xen_running_on_version_or_later(unsigned int major, unsigned int minor);
 
-- 
2.1.4


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