[Xen-devel] [PATCH v3 7/9] hvc/xen: Further s/MFN/GFN clean-up

[Julien Grall <julien.grall@xxxxxxxxxx>]

HVM_PARAM_CONSOLE_PFN is used to retrieved the console PFN for HVM
guest. It returns a PFN (aka GFN) and not a MFN.

Furthermore, use directly virt_to_gfn for both PV and HVM domain rather
than doing a special case for each of the them.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
Reviewed-by: David Vrabel <david.vrabel@xxxxxxxxxx>

---
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Jiri Slaby <jslaby@xxxxxxxx>
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx

    Changes in v2:
        - Add David's reviewed-by
---
 drivers/tty/hvc/hvc_xen.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c
index efe5124..10beb15 100644
--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -200,7 +200,7 @@ static int xen_hvm_console_init(void)
 {
        int r;
        uint64_t v = 0;
-       unsigned long mfn;
+       unsigned long gfn;
        struct xencons_info *info;
 
        if (!xen_hvm_domain())
@@ -217,7 +217,7 @@ static int xen_hvm_console_init(void)
        }
        /*
         * If the toolstack (or the hypervisor) hasn't set these values, the
-        * default value is 0. Even though mfn = 0 and evtchn = 0 are
+        * default value is 0. Even though gfn = 0 and evtchn = 0 are
         * theoretically correct values, in practice they never are and they
         * mean that a legacy toolstack hasn't initialized the pv console 
correctly.
         */
@@ -229,8 +229,8 @@ static int xen_hvm_console_init(void)
        r = hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &v);
        if (r < 0 || v == 0)
                goto err;
-       mfn = v;
-       info->intf = xen_remap(mfn << PAGE_SHIFT, PAGE_SIZE);
+       gfn = v;
+       info->intf = xen_remap(gfn << PAGE_SHIFT, PAGE_SIZE);
        if (info->intf == NULL)
                goto err;
        info->vtermno = HVC_COOKIE;
@@ -375,7 +375,6 @@ static int xencons_connect_backend(struct xenbus_device 
*dev,
        int ret, evtchn, devid, ref, irq;
        struct xenbus_transaction xbt;
        grant_ref_t gref_head;
-       unsigned long mfn;
 
        ret = xenbus_alloc_evtchn(dev, &evtchn);
        if (ret)
@@ -390,10 +389,6 @@ static int xencons_connect_backend(struct xenbus_device 
*dev,
                        irq, &domU_hvc_ops, 256);
        if (IS_ERR(info->hvc))
                return PTR_ERR(info->hvc);
-       if (xen_pv_domain())
-               mfn = virt_to_gfn(info->intf);
-       else
-               mfn = __pa(info->intf) >> PAGE_SHIFT;
        ret = gnttab_alloc_grant_references(1, &gref_head);
        if (ret < 0)
                return ret;
@@ -402,7 +397,7 @@ static int xencons_connect_backend(struct xenbus_device 
*dev,
        if (ref < 0)
                return ref;
        gnttab_grant_foreign_access_ref(ref, info->xbdev->otherend_id,
-                       mfn, 0);
+                                       virt_to_gfn(info->intf), 0);
 
  again:
        ret = xenbus_transaction_start(&xbt);
-- 
2.1.4


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