On Thu, 2016-09-15 at 08:22 +0200, Paolo Bonzini wrote: > > On 15/09/2016 07:54, Raslan, KarimAllah wrote: > > > > > > > > > > On Jun 22, 2016, at 3:41 PM, Paolo Bonzini <pbonz...@redhat.com> > > > wrote: > > > > > > > > > > > > On 22/06/2016 04:34, KarimAllah Ahmed wrote: > > > > > > > > pfn_valid check is not sufficient because it only checks if a > > > > page has a struct page or not, if for example "mem=" was passed > > > > to the kernel some valid pages won't have a struct page. This > > > > means that if guests were assigned valid memory that lies after > > > > the mem= boundary it will be passed uncached to the guest no > > > > matter what the guest caching attributes are for this memory. > > > > > > How can you pass memory after the mem= boundary to the guest? > > > > Does my previous reply answer your question? > > Yes, but I'm not sure it's the right way to do it. Looking at the > e820 memory map seems pretty hacky.
Can you use region_intersects() for this check? See memremap() as an example using this interface. -Toshi
