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head/emulators/xen-kernel47/files/xsa251-4.8.patch
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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 |