commit 32e364c4e72157f144574796ac9ea021e3417d47
Author: Jan Beulich <
[hidden email]>
AuthorDate: Tue Dec 12 14:40:52 2017 +0100
Commit: Jan Beulich <
[hidden email]>
CommitDate: Tue Dec 12 14:40:52 2017 +0100
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 <
[hidden email]>
Reviewed-by: Andrew Cooper <
[hidden email]>
master commit: b4d0218cff66b7eaa9c9b8dc9bd71e7b089b016d
master date: 2017-12-12 14:30:17 +0100
---
xen/arch/x86/mm/paging.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/xen/arch/x86/mm/paging.c b/xen/arch/x86/mm/paging.c
index 75f5fc0..b0037c4 100644
--- a/xen/arch/x86/mm/paging.c
+++ b/xen/arch/x86/mm/paging.c
@@ -274,7 +274,7 @@ void paging_mark_pfn_dirty(struct domain *d, pfn_t pfn)
return;
/* Shared MFNs should NEVER be marked dirty */
- BUG_ON(SHARED_M2P(pfn_x(pfn)));
+ BUG_ON(paging_mode_translate(d) && SHARED_M2P(pfn_x(pfn)));
/*
* Values with the MSB set denote MFNs that aren't really part of the
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.9
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