On 09/19/2011 04:23 AM, Alexander Graf wrote: > > On 15.09.2011, at 20:26, Scott Wood wrote: > >> However, I think it could work reasonably well to use this as the >> backing store instead of vcpu->arch.sprg4-7. The guest would still see >> inconsistency if it writes to paravirt and then reads from the hw reg >> without an intervening exit, so that restriction on use still applies, >> but qemu would see the right thing in sregs, and we wouldn't have the >> duplication. > > Yes, also guest user space would still be fine when guest kernel space writes to the PV reg. We'd be relying on the fact that there's always an intervening exit to do rfi without E.HV, and that the guest has direct read/write access (thus no paravirt) with E.HV. Will make a note of that in the comments. -Scott -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
