Hi Christoffer, On 03/11/17 12:49, Christoffer Dall wrote: > Does a non-secure esb() cause the error to be delivered to firmware on > the secure side if anything is pending?
Yes, the ESB-instruction causes 'synchronisable' errors to become pending as an SError. They then follow the normal SError rules. > I'm not sure I fully understand the interaction between issuing an > esb() in non-secure and firmware handling a RAS error; I thought there > would be none, and that this was only for kernel-first ? To implement firmware-first, EL3 has to set SCR_EL3.EA to route external-aborts and physical SError to EL3. So an ESB-instruction, even in a guest, may cause an SError to be taken to EL3 for firmware-first handling. This is why RAS is causing so much noise for KVM, any notification could also interrupt a guest, so firmware has to emulate an exception taken to EL2 correctly and KVM will have to plumb the notification across to the host APEI code. Thanks, James _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
