[PATCH 4.15 122/163] xen: Fix {set,clear}_foreign_p2m_mapping on autotranslating guests

Greg Kroah-Hartman
2018-02-21T12:49:11Z

From: Simon Gaiser <simon@invisiblethingslab.com>

commit 781198f1f373c3e350dbeb3af04a7d4c81c1b8d7 upstream.

Commit 82616f9599a7 ("xen: remove tests for pvh mode in pure pv paths")
removed the check for autotranslation from {set,clear}_foreign_p2m_mapping
but those are called by grant-table.c also on PVH/HVM guests.

Cc: <stable@vger.kernel.org> # 4.14
Fixes: 82616f9599a7 ("xen: remove tests for pvh mode in pure pv paths")
Signed-off-by: Simon Gaiser <simon@invisiblethingslab.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/x86/xen/p2m.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -694,6 +694,9 @@ int set_foreign_p2m_mapping(struct gntta
int i, ret = 0;
pte_t *pte;

+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return 0;
+
if (kmap_ops) {
ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref,
kmap_ops, count);
@@ -736,6 +739,9 @@ int clear_foreign_p2m_mapping(struct gnt
{
int i, ret = 0;

+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return 0;
+
for (i = 0; i < count; i++) {
unsigned long mfn = __pfn_to_mfn(page_to_pfn(pages[i]));
unsigned long pfn = page_to_pfn(pages[i]);