On 1/12/18 12:37 PM, Andrew Cooper wrote: > Adjust handle_ldt_mapping_fault() exclude the use of this fixup path for > non-PV guests. Well-formed code shouldn't reference the LDT while in HVM vcpu > context, but currently on a context switch from PV to HVM context, there may > be a stale LDT selector loaded, over an unmapped region. > > By explicitly excluding HVM context at this point, we avoid erroneous > hypervisor execution resulting in a cascade failure, by falling into > pv_map_ldt_shadow_page(). > > Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Obviously a behavior change here but the rationale behind it seems clear to me and well worth doing for the net positive result: Reviewed-by: Doug Goldstein <car...@cardoe.com> -- Doug Goldstein
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