Hollis Blanchard wrote:
> On Mon, Dec 21, 2009 at 10:13 AM, Hollis Blanchard
> <hollis@xxxxxxxxxxxxxx> wrote:
>
>> void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
>> {
>> unsigned long dec_nsec;
>>
>> pr_debug("mtDEC: %x\n", vcpu->arch.dec);
>> #ifdef CONFIG_PPC64
>> /* POWER4+ triggers a dec interrupt if the value is < 0 */
>> if (vcpu->arch.dec & 0x80000000) {
>> hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
>> kvmppc_core_queue_dec(vcpu);
>> + /* keep queuing interrupts until guest clears high MSR bit */
>> + hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, 100),
>> + HRTIMER_MODE_REL);
>> return;
>> }
>> #endif
>>
>
> Of course, removing the hardcoded 100-ns timer would be better, and
> indeed we can do that. What we *really* want is to key off of MSR[EE]
> changes (there's no point in queuing anything until then).
Yes. mtmsr with EE=1 triggers a #VMEXIT which then goes off into a VM
entry which on entering checks that the DEC interrupt is still active
and fires it.
> So why not
> move your "AGGRESSIVE_DEC" check into Book 3S's kvmppc_set_msr()?
>
The idea was to get rid of AGGRESSIVE_DEC :-).
Alex
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