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768717cce7
Preparatory change in order to import a newer Xen version while keeping the previous one. Reviewed by: bapt Sponsored by: Citrix Systems R&D Differential Revision: https://reviews.freebsd.org/D16416
21 lines
666 B
Diff
21 lines
666 B
Diff
From: Jan Beulich <jbeulich@suse.com>
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Subject: x86/paging: don't unconditionally BUG() on finding SHARED_M2P_ENTRY
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PV guests can fully control the values written into the P2M.
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This is XSA-251.
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Signed-off-by: Jan Beulich <jbeulich@suse.com>
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Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
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--- a/xen/arch/x86/mm/paging.c
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+++ b/xen/arch/x86/mm/paging.c
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@@ -276,7 +276,7 @@ void paging_mark_pfn_dirty(struct domain
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return;
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/* Shared MFNs should NEVER be marked dirty */
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- BUG_ON(SHARED_M2P(pfn));
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+ BUG_ON(paging_mode_translate(d) && SHARED_M2P(pfn));
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/*
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* Values with the MSB set denote MFNs that aren't really part of the
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