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UPSTREAM: Documentation: admin-guide: Document side effects when pKVM is enabled

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Recent changes to KVM for arm64 has made it impossible for the host to
hibernate or use kexec when protected mode is enabled via the kernel
command line.

There are people who rely on kexec (for example, developers who use kexec
as a quick way to test a new kernel), let's document this change in
behaviour, so it doesn't catch them by surprise and we have a place to
point people to if it does.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211011153835.291147-1-alexandru.elisei@arm.com
(cherry picked from commit 53e8ce137f)
Bug: 204960018
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: I674520b73423e9a7c705788853ad7d9e8f1be2e2
This commit is contained in:
Alexandru Elisei
2021-10-11 16:38:35 +01:00
committed by Will Deacon
parent 785107d23e
commit 54e3c184e4
1 changed files with 3 additions and 1 deletions
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4
Documentation/admin-guide/kernel-parameters.txt
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@@ -2378,7 +2378,9 @@
state is kept private from the host.
Not valid if the kernel is running in EL2.
Defaults to VHE/nVHE based on hardware support.
Defaults to VHE/nVHE based on hardware support. Setting
mode to "protected" will disable kexec and hibernation
for the host.
kvm-arm.vgic_v3_group0_trap=
[KVM,ARM] Trap guest accesses to GICv3 group-0