linux-kernel - [PATCH] doc/arm: take care restore order of GICR

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Date:   Wed, 21 Jul 2021 17:20:19 +0800
From:   Jianyong Wu <jianyong.wu@....com>
To:     maz@...nel.org, james.morse@....com, andre.przywara@....com,
        lushenming@...wei.com
Cc:     kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        justin.he@....com, jianyong.wu@....com
Subject: [PATCH] doc/arm: take care restore order of GICR_* in ITS restore

When restore GIC/ITS, GICR_CTLR must be restored after GICR_PROPBASER
and GICR_PENDBASER. That is important, as both of GICR_PROPBASER and
GICR_PENDBASER will fail to be loaded when lpi has enabled yet in
GICR_CTLR. Keep the restore order above will avoid that issue.
Shout it out at the doc is very helpful that may avoid lots of debug work.

Signed-off-by: Jianyong Wu <jianyong.wu@....com>
---
 Documentation/virt/kvm/devices/arm-vgic-its.rst | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/virt/kvm/devices/arm-vgic-its.rst b/Documentation/virt/kvm/devices/arm-vgic-its.rst
index d257eddbae29..6b36de6937f8 100644
--- a/Documentation/virt/kvm/devices/arm-vgic-its.rst
+++ b/Documentation/virt/kvm/devices/arm-vgic-its.rst
@@ -126,7 +126,8 @@ ITS Restore Sequence:
 The following ordering must be followed when restoring the GIC and the ITS:
 
 a) restore all guest memory and create vcpus
-b) restore all redistributors
+b) restore all redistributors:
+   make sure restore GICR_CTLR after GICR_PROPBASER and GICR_PENDBASER
 c) provide the ITS base address
    (KVM_DEV_ARM_VGIC_GRP_ADDR)
 d) restore the ITS in the following order:
-- 
2.17.1