Gregory Haskins wrote:
>>>> On Tue, Apr 10, 2007 at 11:39 AM, in message <[EMAIL PROTECTED]>,
>>>>
> Gregory Haskins wrote:
>
>> We could change the API to handle the pending condition as a tri-level
>>
>
> I just thought of a better way. Leave the return value as a boolean, but use
> the concept of the mask_reasons. It simplifies the logic, and allows the
> irqdevice to register for additional VMEXITs regardless of whether its
> currently injecting something or not. So we have:
>
> spin_lock(vcpu- >irq_lock)
> vcpu->exit_reasons = 0;
> nmi = !irq_window_open(vcpu)
> if (vcpu- >irq- >pending(nmi, &mask_reasons))
> inject(vcpu, vcpu- >irq- >read_vector(nmi))
> if (mask_reasons) {
> if (mask_reasons & MASKREASON_TPR)
> vcpu->exit_reasons &= TPR;
> /* etc */
> }
> spin_unlock(vcpu- >irq_lock)
>
It's more complex than that; you need to program the hardware to exit on
a specific threshold level of tpr values (e.g. exit when tpr <= n).
It's a little sad to encode a complex condition (wait for nmi window
opening/wait for irq window opening/wait for irq window opening with tpr
<= n) in irqdevice, then decode it in the vcpu and program the hardware
accordingly.
--
error compiling committee.c: too many arguments to function
-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys-and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________
kvm-devel mailing list
kvm-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/kvm-devel
