Gautham R. Shenoy's on March 31, 2020 10:10 pm: > From: "Gautham R. Shenoy" <ego@xxxxxxxxxxxxxxxxxx> > > If a guest executes a stop instruction when the hypervisor has set the > PSSCR[ESL|EC] bits, the processor will throw an Hypervisor Facility > Unavailable exception. Currently when we receive this exception, we > only check if the exeception is generated due to a doorbell > instruction, in which case we emulate it. For all other cases, > including the case when the guest executes a stop-instruction, the > hypervisor sends a PROGILL to the guest program, which results in a > guest crash. > > This patch adds code to handle the case when the hypervisor receives a > H_FAC_UNAVAIL exception due to guest executing the stop > instruction. The hypervisor increments the pc to the next instruction > and resumes the guest as expected by the semantics of the > PSSCR[ESL|EC] = 0 stop instruction. This seems reasonable, I don't think we need to crash the guest here. Thanks, Nick
