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Documentation: Update the behaviour of "kvm-arm.mode"

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Commit 5053c3f051 ("KVM: arm64: Use hVHE in pKVM by default on CPUs with
VHE support") modified the behaviour of "kvm-arm.mode=protected" without
the updating the kernel parameters doc.

Update it to match the current implementation.

Also, update required architecture version for nested virtualization as
suggested by Marc.

Cc: Will Deacon <will@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>

Signed-off-by: Mostafa Saleh <smostafa@google.com>
Link: https://lore.kernel.org/r/20241025093259.2216093-1-smostafa@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Mostafa Saleh 2024-10-25 09:32:59 +00:00 committed by Marc Zyngier
parent e891432cf7
commit e8440c1e2d
1 changed files with 10 additions and 6 deletions
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16
Documentation/admin-guide/kernel-parameters.txt
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@ -2748,17 +2748,21 @@
nvhe: Standard nVHE-based mode, without support for
protected guests.
protected: nVHE-based mode with support for guests whose
state is kept private from the host.
protected: Mode with support for guests whose state is
kept private from the host, using VHE or
nVHE depending on HW support.
nested: VHE-based mode with support for nested
virtualization. Requires at least ARMv8.3
hardware.
virtualization. Requires at least ARMv8.4
hardware (with FEAT_NV2).
Defaults to VHE/nVHE based on hardware support. Setting
mode to "protected" will disable kexec and hibernation
for the host. "nested" is experimental and should be
used with extreme caution.
for the host. To force nVHE on VHE hardware, add
"arm64_sw.hvhe=0 id_aa64mmfr1.vh=0" to the
command-line.
"nested" is experimental and should be used with
extreme caution.
kvm-arm.vgic_v3_group0_trap=
[KVM,ARM,EARLY] Trap guest accesses to GICv3 group-0