Am 12.08.2011 um 05:35 schrieb David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>: > On Tue, Aug 09, 2011 at 06:31:45PM +0200, Alexander Graf wrote: >> When running a PAPR guest, we need to handle a few hypercalls in kernel space, >> most prominently the page table invalidation (to sync the shadows). >> >> So this patch adds handling for a few PAPR hypercalls to PR mode KVM. I tried >> to share the code with HV mode, but it ended up being a lot easier this way >> around, as the two differ too much in those details. > > Are these strictly necessary, or just an optimization? Because you're > using the space allocated by qemu for the guest hash table, it seems > to be you could just let h_enter fall through to qemu which will put > the right thing into the guest hash table which you can then walk in > the kernel translation code. Every time a PTE can be invalidated, we need to do so in kvm to keep the SPT in sync. IIRC h_enter can evict/overwrite a previous entry, so we need to handle it in kvm as well :). Removal definitely needs to happin in-kernel. Alex > -- 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
