[PATCH v1] KVM: arm64: pkvm: Clear GICv3 LRs in the hypervisor

[Vincent Donnefort]

On Wed, Oct 21, 2026 at 01:22:28PM +0100, Marc Zyngier wrote:
> On Wed, 21 Oct 2026 12:00:00 +0100,
> Vincent Donnefort <vdonnefort at google.com> wrote:
> > 
> > The LR registers are architecturally UNKNOWN when the CPU boots or
> > resumes. However, in protected mode, only the used ones are reset.
> > During boot the HVC __vgic_v3_init_lrs() is never called because
> > vgic_present is only set in init_subsystems(), after cpu_hyp_init() was
> > called.
> 
> Why don't you fix this rather than making the init even more
> different?

Ack, I'll make a patch to fix that first.

> 
> > Also, the PM notifier isn't registered for pKVM and the HVC
> > becomes unavailable after the host is deprivileged.
> 
> Sanitising the LRs on PSCI_ON is probably the right thing to do, but I
> don't understand why resetting the LRs is out of reach from the host,
> given that the host is fully in charge of the interrupt injection, and
> therefore controls the LRs.

I suppose I could reinstantiate the pm callbacks for pkvm to at least reset the
LRs?

-- 
Vincent

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