Re: [RESEND 2][PATCH 4/4] Modify KVM to update guest time accounting.

Christian Borntraeger
2007-10-15T11:33:35Z

Am Montag, 15. Oktober 2007 schrieb Avi Kivity:
> We can clear it a bit later, after local_irq_enable() in __vcpu_run().
> However we need a nop instruction first because "sti" keeps interrupts
> disabled for one more instruction.

Ah, I see. The host interrupt behaves different and instead of running the
interrupt handler, it exits the vmrun on x86? The interrupt handler will be
called some cycles after the sti?
That is different to s390. We can run the guest code for a long time and the
host instruction pointer stays on the sie instruction. That means, we can
interrupt sie and continue by simply setting the instrution pointer (PSW)
back to the sie instruction.

Any idea how to make this proper on all architectures? I will have a look.

Christian