Re: [Xen-devel] [PATCH v2 03/16] Xen: xlate: Use page_to_xen_pfn instead of page_to_pfn

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On 2016/1/19 22:59, Stefano Stabellini wrote:
On Mon, 18 Jan 2016, Shannon Zhao wrote:
On 2016/1/16 1:08, Stefano Stabellini wrote:
On Fri, 15 Jan 2016, Shannon Zhao wrote:
From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Use page_to_xen_pfn in case of 64KB page.

Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
  drivers/xen/xlate_mmu.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/xlate_mmu.c b/drivers/xen/xlate_mmu.c
index 9692656..b9fcc2c 100644
--- a/drivers/xen/xlate_mmu.c
+++ b/drivers/xen/xlate_mmu.c
@@ -227,7 +227,7 @@ int __init xen_xlate_map_ballooned_pages(xen_pfn_t **gfns, void **virt,
  		return rc;
  	}
  	for (i = 0; i < nr_grant_frames; i++)
-		pfns[i] = page_to_pfn(pages[i]);
+		pfns[i] = page_to_xen_pfn(pages[i]);

Shannon, thanks for the patch.

Keeping in mind that in the 64K case, kernel pages are 64K but xen pages
are still 4K, I think you also need to allocate
(nr_grant_frames/XEN_PFN_PER_PAGE) kernel pages (assuming that they are
allocated contiguously): nr_grant_frames refers to 4K pages, while
xen_xlate_map_ballooned_pages is allocating pages on a 64K granularity
(sizeof(pages[0]) == 64K).

Be careful that alloc_xenballooned_pages deals with 64K pages (because
it deals with kernel pages), while xen_pfn_t is always 4K based (because
it deals with Xen pfns).

Please test it with and without CONFIG_ARM64_64K_PAGES. Thanks!

Stefano, thanks for your explanation. How about below patch?

Good work, it looks like you covered all bases, I think it should work,
but I haven't tested it myself. Just one note below.


diff --git a/drivers/xen/xlate_mmu.c b/drivers/xen/xlate_mmu.c
index 9692656..e1f7c95 100644
--- a/drivers/xen/xlate_mmu.c
+++ b/drivers/xen/xlate_mmu.c
@@ -207,9 +207,12 @@ int __init xen_xlate_map_ballooned_pages(xen_pfn_t
**gfns, void **virt,
         void *vaddr;
         int rc;
         unsigned int i;
+       unsigned long nr_pages;
+       xen_pfn_t xen_pfn = 0;

         BUG_ON(nr_grant_frames == 0);
-       pages = kcalloc(nr_grant_frames, sizeof(pages[0]), GFP_KERNEL);
+       nr_pages = DIV_ROUND_UP(nr_grant_frames, XEN_PFN_PER_PAGE);
+       pages = kcalloc(nr_pages, sizeof(pages[0]), GFP_KERNEL);
         if (!pages)
                 return -ENOMEM;

@@ -218,22 +221,25 @@ int __init xen_xlate_map_ballooned_pages(xen_pfn_t
**gfns, void **virt,
                 kfree(pages);
                 return -ENOMEM;
         }
-       rc = alloc_xenballooned_pages(nr_grant_frames, pages);
+       rc = alloc_xenballooned_pages(nr_pages, pages);
         if (rc) {
-               pr_warn("%s Couldn't balloon alloc %ld pfns rc:%d\n",
__func__,
-                       nr_grant_frames, rc);
+               pr_warn("%s Couldn't balloon alloc %ld pages rc:%d\n",
__func__,
+                       nr_pages, rc);
                 kfree(pages);
                 kfree(pfns);
                 return rc;
         }
-       for (i = 0; i < nr_grant_frames; i++)
-               pfns[i] = page_to_pfn(pages[i]);
+       for (i = 0; i < nr_grant_frames; i++) {
+               if ((i % XEN_PFN_PER_PAGE) == 0)
+                       xen_pfn = page_to_xen_pfn(pages[i /
XEN_PFN_PER_PAGE]);
+               pfns[i] = xen_pfn++;
+       }

We might want to:

   pfns[i] = pfn_to_gfn(xen_pfn++);

for consistency, even though for autotranslate guests pfn_to_gfn always
returns pfn.

Ok, will add. Thanks.


-       vaddr = vmap(pages, nr_grant_frames, 0, PAGE_KERNEL);
+       vaddr = vmap(pages, nr_pages, 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);
+               pr_warn("%s Couldn't map %ld pages rc:%d\n", __func__,
+                       nr_pages, rc);
+               free_xenballooned_pages(nr_pages, pages);
                 kfree(pages);
                 kfree(pfns);
                 return -ENOMEM;

--
Shannon


--
Shannon
--
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