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xen.10697
5a2fd9e9-x86-paging-dont-wrongly-BUG-finding-SH...
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File 5a2fd9e9-x86-paging-dont-wrongly-BUG-finding-SHARED_M2P_ENTRY.patch of Package xen.10697
# Commit b4d0218cff66b7eaa9c9b8dc9bd71e7b089b016d # Date 2017-12-12 14:30:17 +0100 # Author Jan Beulich <jbeulich@suse.com> # Committer Jan Beulich <jbeulich@suse.com> 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_dirty(struct domain *d, /* We /really/ mean PFN here, even for non-translated guests. */ pfn = get_gpfn_from_mfn(mfn_x(gmfn)); /* 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
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