On Sat, Jan 27, 2018 at 12:56:47AM -0800, Dexuan-BSD Cui wrote:
> Hi,
> Today I found the KPTI patch broke FreeBSD VM running on Hyper-V: the VM
> can't boot due to:
>
> vmbus0: cannot find free IDT vector
>
> This is the related snippet:
>
> dev/hyperv/vmbus/vmbus.c: vmbus_intr_setup() -> lapic_ipi_alloc() fails:
>
> /*
> * All Hyper-V ISR required resources are setup, now let's find a
> * free IDT vector for Hyper-V ISR and set it up.
> */
> sc->vmbus_idtvec = lapic_ipi_alloc(pti ? IDTVEC(vmbus_isr_pti) :
> IDTVEC(vmbus_isr));
> if (sc->vmbus_idtvec < 0) {
> device_printf(sc->vmbus_dev, "cannot find free IDT
> vector\n");
> return ENXIO;
> }
>
> Luckily for now I can work around this boot failure by adding vm.pmap.pti=0
> into /boot/loader.conf.
>
> Any suggestion?
Try r328468.
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