Re: [PATCH v4 02/48] irqchip/gic-v5: Provide OF IRS config frame attrs to KVM

[Marc Zyngier <maz@kernel.org>]

On Fri, 24 Jul 2026 11:48:56 +0100,
Sascha Bischoff <Sascha.Bischoff@arm.com> wrote:
> 
> KVM needs to interact with the host IRS in order to, for example, make
> VMs or VPEs valid. There are two potential approaches here. Either the
> host irqchip driver can provide an interface, or KVM can interact
> directly with the host IRS. The latter of these two is chosen as the
> set of MMIO registers that KVM needs to interact with is orthogonal to
> the set used by the host irqchip driver (with the exception of some of
> the read-only IRS_IDRx registers).
> 
> Pass KVM a pointer to an IRS config frame - the config frame belonging
> to ANY IRS is fine as long as one IRS's config frame is used
> consistently - in struct gic_kvm_info. Additionally, include a flag
> telling KVM whether the IRS is coherent or non-coherent in order to
> make sure that KVM can do the correct cache state management, if
> required.
> 
> Only OF (Device Tree) is supported with this change. ACPI is not.

From what I can see, the ACPI support has completely ignored the KVM
setup. This would need to be addressed quickly.

Lorenzo, what's the status of ACPI support?

	M.

-- 
Jazz isn't dead. It just smells funny.