diff options
| author |   Mostafa Saleh <smostafa@google.com> | 2024-10-25 09:32:59 +0000 |
|---|---|---|
| committer |   Marc Zyngier <maz@kernel.org> | 2025-01-08 10:17:13 +0000 |
| commit | e8440c1e2d23a9ca5e0af1a18be637cbd5a5d44f (patch) | |
| tree | 333b870ae32617187cb96e775044ca7b5f1dbd60 | |
| parent | KVM: arm64: nv: Advertise the lack of AArch32 EL0 support (diff) | |
| download | linux-rng-e8440c1e2d23a9ca5e0af1a18be637cbd5a5d44f.tar.xz linux-rng-e8440c1e2d23a9ca5e0af1a18be637cbd5a5d44f.zip | |
Documentation: Update the behaviour of "kvm-arm.mode"
Commit 5053c3f0519c ("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>
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 3872bc6ec49d..7c870883af8e 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -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 |