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| author | Simon Leiner <simon@leiner.me> | 2020-08-25 12:31:52 +0300 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2020-08-27 09:58:48 +0300 |
| commit | d742db70033c745e410523e00522ee0cfe2aa416 (patch) | |
| tree | fa7839e4a938daccf8f881ea913926950bd31e8f /drivers/xen | |
| parent | c330fb1ddc0a922f044989492b7fcca77ee1db46 (diff) | |
| download | linux-d742db70033c745e410523e00522ee0cfe2aa416.tar.xz | |
xen/xenbus: Fix granting of vmalloc'd memory
On some architectures (like ARM), virt_to_gfn cannot be used for
vmalloc'd memory because of its reliance on virt_to_phys. This patch
introduces a check for vmalloc'd addresses and obtains the PFN using
vmalloc_to_pfn in that case.
Signed-off-by: Simon Leiner <simon@leiner.me>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Link: https://lore.kernel.org/r/20200825093153.35500-1-simon@leiner.me
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/xenbus/xenbus_client.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c index 786fbb7d8be0..907bcbb93afb 100644 --- a/drivers/xen/xenbus/xenbus_client.c +++ b/drivers/xen/xenbus/xenbus_client.c @@ -379,8 +379,14 @@ int xenbus_grant_ring(struct xenbus_device *dev, void *vaddr, int i, j; for (i = 0; i < nr_pages; i++) { - err = gnttab_grant_foreign_access(dev->otherend_id, - virt_to_gfn(vaddr), 0); + unsigned long gfn; + + if (is_vmalloc_addr(vaddr)) + gfn = pfn_to_gfn(vmalloc_to_pfn(vaddr)); + else + gfn = virt_to_gfn(vaddr); + + err = gnttab_grant_foreign_access(dev->otherend_id, gfn, 0); if (err < 0) { xenbus_dev_fatal(dev, err, "granting access to ring page"); |