Am 12.08.2011 um 05:33 schrieb David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>: > On Tue, Aug 09, 2011 at 06:31:47PM +0200, Alexander Graf wrote: >> PAPR defines hypercalls as SC1 instructions. Using these, the guest modifies >> page tables and does other privileged operations that it wouldn't be allowed >> to do in supervisor mode. >> >> This patch adds support for PR KVM to trap these instructions and route them >> through the same PAPR hypercall interface that we already use for HV style >> KVM. > > This will work on a powermac or bare metal host. Unfortunately, it's > not enough on a pSeries LPAR host - the sc 1 instruction from the > guest problem state will go direct to the hypervisor, which will > return an error rather than trapping to the guest kernel. > > The only way around this I can see is for qemu to search for and patch > up sc 1 instructions to something else. Obviously that would also > need some kernel support, and probably a capability to let it know if > it's necessary. Well I'd like to keep Qemu out of the patching business, so the guest kernel would have to patch itself. But yes, PHyP guests can't run this target yet :). I'll take a stab at that too, but one continent at a time! ;) 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
