[Xen-devel] [PATCH v13 15/19] xen/grant-table: Refactor gnttab_init

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

We have this odd scenario of where for PV paths we take a shortcut
but for the HVM paths we first ioremap xen_hvm_resume_frames, then
assign it to gnttab_shared.addr. This is needed because gnttab_map
uses gnttab_shared.addr.

Instead of having:
        if (pv)
                return gnttab_map
        if (hvm)
                ...

        gnttab_map

Lets move the HVM part before the gnttab_map and remove the
first call to gnttab_map.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Reviewed-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 drivers/xen/grant-table.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 99399cb..cc1b4fa 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -1173,22 +1173,17 @@ static int gnttab_setup(void)
        if (max_nr_gframes < nr_grant_frames)
                return -ENOSYS;
 
-       if (xen_pv_domain())
-               return gnttab_map(0, nr_grant_frames - 1);
-
-       if (gnttab_shared.addr == NULL) {
+       if (xen_feature(XENFEAT_auto_translated_physmap) && gnttab_shared.addr 
== NULL)
+       {
                gnttab_shared.addr = xen_remap(xen_hvm_resume_frames,
-                                               PAGE_SIZE * max_nr_gframes);
+                                              PAGE_SIZE * max_nr_gframes);
                if (gnttab_shared.addr == NULL) {
                        pr_warn("Failed to ioremap gnttab share frames 
(addr=0x%08lx)!\n",
                                        xen_hvm_resume_frames);
                        return -ENOMEM;
                }
        }
-
-       gnttab_map(0, nr_grant_frames - 1);
-
-       return 0;
+       return gnttab_map(0, nr_grant_frames - 1);
 }
 
 int gnttab_resume(void)
-- 
1.8.3.1


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