On Thu, May 20, 2021 at 03:34:28PM +0200, Jan Beulich wrote:
> The SDM specifically allows for earlier writes to fully overlapping
> ranges to be dropped. If a guest did so, hvmemul_phys_mmio_access()
> would crash it if varying data was written to the same address. Detect
> overlaps early, as doing so in hvmemul_{linear,phys}_mmio_access() would
> be quite a bit more difficult. To maintain proper faulting behavior,
> instead of dropping earlier write instances of fully overlapping slots
> altogether, write the data of the final of these slots multiple times.Is it possible for a later (non duplicated slot) to cause a fault ending the instruction without reaching that final slot that contains the written data? Thanks, Roger.
