[PATCH v2 15/36] KVM: arm64: gic-v5: Implement GICv5 load/put and save/restore

[Sascha Bischoff]

On Wed, 2026-01-07 at 12:28 +0000, Jonathan Cameron wrote:
> On Fri, 19 Dec 2025 15:52:41 +0000
> Sascha Bischoff <Sascha.Bischoff at arm.com> wrote:
> 
> > This change introduces GICv5 load/put. Additionally, it plumbs in
> > save/restore for:
> > 
> > * PPIs (ICH_PPI_x_EL2 regs)
> > * ICH_VMCR_EL2
> > * ICH_APR_EL2
> > * ICC_ICSR_EL1
> > 
> > A GICv5-specific enable bit is added to struct vgic_vmcr as this
> > differs from previous GICs. On GICv5-native systems, the VMCR only
> > contains the enable bit (driven by the guest via ICC_CR0_EL1.EN)
> > and
> > the priority mask (PCR).
> > 
> > A struct gicv5_vpe is also introduced. This currently only contains
> > a
> > single field - bool resident - which is used to track if a VPE is
> > currently running or not, and is used to avoid a case of double
> > load
> > or double put on the WFI path for a vCPU. This struct will be
> > extended
> > as additional GICv5 support is merged, specifically for VPE
> > doorbells.
> > 
> > Co-authored-by: Timothy Hayes <timothy.hayes at arm.com>
> > Signed-off-by: Timothy Hayes <timothy.hayes at arm.com>
> > Signed-off-by: Sascha Bischoff <sascha.bischoff at arm.com>
> 
> 
> > diff --git a/arch/arm64/kvm/vgic/vgic-v5.c
> > b/arch/arm64/kvm/vgic/vgic-v5.c
> > index 1fe1790f1f874..168447ee3fbed 100644
> > --- a/arch/arm64/kvm/vgic/vgic-v5.c
> > +++ b/arch/arm64/kvm/vgic/vgic-v5.c
> > @@ -1,4 +1,7 @@
> >  // SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * Copyright (C) 2025 Arm Ltd.
> > + */
> 
> Why in this patch?  It's trivial enough that maybe it doesn't need to
> be
> on it's own, but the first patch touching this file seems like a more
> logical place to find it.

I wholeheartedly agree, but it was unintentionally omitted when the
GICv5 compat mode changes were introduced. It was originally in the
first commit in this series to touch the file, but then things got re-
worked so it became the second. I'll make sure that it lives in the
first commit of this series to touch the file.

Sascha