Patch "xen: Fix {set,clear}_foreign_p2m_mapping on autotranslating guests" has been added to the 4.14-stable tree

Patch "xen: Fix {set,clear}_foreign_p2m_mapping on autotranslating guests" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    xen: Fix {set,clear}_foreign_p2m_mapping on autotranslating guests

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     xen-fix-set-clear-_foreign_p2m_mapping-on-autotranslating-guests.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 781198f1f373c3e350dbeb3af04a7d4c81c1b8d7 Mon Sep 17 00:00:00 2001
From: Simon Gaiser <simon@invisiblethingslab.com>
Date: Wed, 7 Feb 2018 21:47:40 +0100
Subject: xen: Fix {set,clear}_foreign_p2m_mapping on autotranslating guests

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]);


Patches currently in stable-queue which might be from simon@invisiblethingslab.com are

queue-4.14/xen-fix-set-clear-_foreign_p2m_mapping-on-autotranslating-guests.patch