Re: [RFC PATCH] KVM: arm64: Set irqfd->producer to enable vLPI routing updates

[Marc Zyngier]

+ Eric

On Tue, 23 Jun 2026 09:14:33 +0100,
leixiang <leixiang@xxxxxxxxxx> wrote:
> 
> ARM64's kvm_arch_irq_bypass_add_producer() never sets irqfd->producer,
> so kvm_irq_routing_update() never calls the ARM64 routing hook.  That
> hook unmaps the vLPI and falls back to software injection when an
> irqfd's MSI routing changes; with it dead, the vLPI stays bound to the
> old translation.

/confused. Why should userspace be in control of anything? There is no
real "routing" involved (that's the guest's responsibility), and we
are really trying to hide the fact that VLPIs are used to deliver
guest-visible LPIs.

Can you explain what this is achieving?

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.