On 05/21/2012 01:35 PM, Hao, Xudong wrote: > > > > That doesn't answer the question. An atomic operation is now non-atomic. > > > > You can calculate shadow_accessed_bit and keep on using clear_bit(), or > > switch to cmpxchg64(), but don't just drop the dirty bit here. > > > > I know your meaning. How about this changes: > > ... > young = 1; > + if (enable_ept_ad_bits) > + clear_bit(ffs(shadow_accessed_mask), (unsigned long *)spte); ffs() returns an off-by-one result, so this needs to be adjusted. IIRC bsfl is slow, but this shouldn't be a problem here. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
