On 15/09/2016 18:04, Kani, Toshimitsu wrote: > 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 <pbonzini@xxxxxxxxxx> >>>> 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. This one seems more generic but very slow. Paolo -- 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
