On Wed, Mar 03, 2010 at 08:12:03PM +0100, Joerg Roedel wrote: > Hi, > > here are the patches that implement nested paging support for nested > svm. They are somewhat intrusive to the soft-mmu so I post them as RFC > in the first round to get feedback about the general direction of the > changes. Nevertheless I am proud to report that with these patches the > famous kernel-compile benchmark runs only 4% slower in the l2 guest as > in the l1 guest when l2 is single-processor. With SMP guests the > situation is very different. The more vcpus the guest has the more is > the performance drop from l1 to l2. > Anyway, this post is to get feedback about the overall concept of these > patches. Please review and give feedback :-) Joerg, What perf gain does this bring ? (i'm not aware of the current overhead). Overall comments: Can't you translate l2_gpa -> l1_gpa walking the current l1 nested pagetable, and pass that to the kvm tdp fault path (with the correct context setup)? You probably need to include a flag in base_role to differentiate between l1 / l2 shadow tables (say if they use the same cr3 value). -- 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
