mirror of
https://git.freebsd.org/ports.git
synced 2025-06-24 06:00:30 -04:00
989d8dbb27
This includes a band-aid for running 64bit PV guests without compromising the whole system. MFH: 2018Q1 Sponsored by: Citrix Systems R&D
21 lines
666 B
Diff
21 lines
666 B
Diff
From: Jan Beulich <jbeulich@suse.com>
|
|
Subject: x86/paging: don't unconditionally BUG() on finding SHARED_M2P_ENTRY
|
|
|
|
PV guests can fully control the values written into the P2M.
|
|
|
|
This is XSA-251.
|
|
|
|
Signed-off-by: Jan Beulich <jbeulich@suse.com>
|
|
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
|
|
|
|
--- a/xen/arch/x86/mm/paging.c
|
|
+++ b/xen/arch/x86/mm/paging.c
|
|
@@ -276,7 +276,7 @@ void paging_mark_pfn_dirty(struct domain
|
|
return;
|
|
|
|
/* Shared MFNs should NEVER be marked dirty */
|
|
- BUG_ON(SHARED_M2P(pfn));
|
|
+ BUG_ON(paging_mode_translate(d) && SHARED_M2P(pfn));
|
|
|
|
/*
|
|
* Values with the MSB set denote MFNs that aren't really part of the
|