[PATCH v3 0/4] KVM: arm64: vgic: Fix IGROUPR writability and IIDR revision control

[David Woodhouse]

On Mon, 2026-05-11 at 12:30 +0100, David Woodhouse wrote:
> Maintaining precise guest compatibility across host kernel upgrades —
> and even downgrades, since rollback is sometimes necessary — is not 
> optional. That *shouldn't* need saying, but maybe it does:
> https://lore.kernel.org/all/6856b269d2af706eae397e0cf9c1231f89d9a932.camel@infradead.org/
> 
> This series fixes the GICv2/v3 IGROUPR writability model to be
> consistently controlled by the GICD_IIDR implementation revision,
> replacing the ad-hoc v2_groups_user_writable flag.

The more generic question of whether KVM should actually maintain guest
compatibility from one version of the host kernel to another is being
discussed in that other thread.

Setting that aside, is there any *technical* feedback on this series? I
believe I've dealt with all of Marc's feedback on v1 (thanks).

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