On Wed, Jul 05, 2017 at 07:29:46PM +0300, Dmitry Osipenko wrote: > Due to a bug, multiple devices may try to map the same IOVA region. We can > catch that case by checking that 'VALID' bit of the GART's page entry is > unset prior to mapping of the page. Due to what bug? Sounds to me like access to the GART should be exclusive, so that only a single driver can ever access it. Thierry
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