From 0df4f266b3af90442bbeb5e685a84a80745beba0 Mon Sep 17 00:00:00 2001 From: Julien Grall Date: Fri, 7 Aug 2015 17:34:37 +0100 Subject: xen: Use correctly the Xen memory terminologies Based on include/xen/mm.h [1], Linux is mistakenly using MFN when GFN is meant, I suspect this is because the first support for Xen was for PV. This resulted in some misimplementation of helpers on ARM and confused developers about the expected behavior. For instance, with pfn_to_mfn, we expect to get an MFN based on the name. Although, if we look at the implementation on x86, it's returning a GFN. For clarity and avoid new confusion, replace any reference to mfn with gfn in any helpers used by PV drivers. The x86 code will still keep some reference of pfn_to_mfn which may be used by all kind of guests No changes as been made in the hypercall field, even though they may be invalid, in order to keep the same as the defintion in xen repo. Note that page_to_mfn has been renamed to xen_page_to_gfn to avoid a name to close to the KVM function gfn_to_page. Take also the opportunity to simplify simple construction such as pfn_to_mfn(page_to_pfn(page)) into xen_page_to_gfn. More complex clean up will come in follow-up patches. [1] http://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=e758ed14f390342513405dd766e874934573e6cb Signed-off-by: Julien Grall Reviewed-by: Stefano Stabellini Acked-by: Dmitry Torokhov Acked-by: Wei Liu Signed-off-by: David Vrabel --- drivers/input/misc/xen-kbdfront.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/input/misc') diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c index 95599e478e19..23d0549539d4 100644 --- a/drivers/input/misc/xen-kbdfront.c +++ b/drivers/input/misc/xen-kbdfront.c @@ -232,7 +232,7 @@ static int xenkbd_connect_backend(struct xenbus_device *dev, struct xenbus_transaction xbt; ret = gnttab_grant_foreign_access(dev->otherend_id, - virt_to_mfn(info->page), 0); + virt_to_gfn(info->page), 0); if (ret < 0) return ret; info->gref = ret; @@ -255,7 +255,7 @@ static int xenkbd_connect_backend(struct xenbus_device *dev, goto error_irqh; } ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu", - virt_to_mfn(info->page)); + virt_to_gfn(info->page)); if (ret) goto error_xenbus; ret = xenbus_printf(xbt, dev->nodename, "page-gref", "%u", info->gref); -- cgit v1.2.3