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. -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson -- 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
