Commit e8440c1e authored by Mostafa Saleh's avatar Mostafa Saleh Committed by Marc Zyngier
Browse files

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



Commit 5053c3f0 ("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: default avatarMostafa Saleh <smostafa@google.com>
Link: https://lore.kernel.org/r/20241025093259.2216093-1-smostafa@google.com


Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
parent e891432c

Documentation/admin-guide/kernel-parameters.txt

+10 −6
Original line number Diff line number Diff line
@@ -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