On Wed, Feb 03, 2016 at 06:00:16PM +0000, Marc Zyngier wrote: > Having both VHE and non-VHE capable CPUs in the same system > is likely to be a recipe for disaster. > > If the boot CPU has VHE, but a secondary is not, we won't be > able to downgrade and run the kernel at EL1. Add CPU hotplug > to the mix, and this produces a terrifying mess. > > Let's solve the problem once and for all. If you mix VHE and > non-VHE CPUs in the same system, you deserve to loose, and this > patch makes sure you don't get a chance. > > This is implemented by storing the kernel execution level in > a global variable. Secondaries will park themselves in a > WFI loop if they observe a mismatch. Also, the primary CPU > will detect that the secondary CPU has died on a mismatched > execution level. Panic will follow. > > Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx> Reviewed-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx> -- 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
