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FROMGIT: arm64: Make kvm-arm.mode={nvhe, protected} an alias of id_aa64mmfr1.vh=0

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Admitedly, passing id_aa64mmfr1.vh=0 on the command-line isn't
that easy to understand, and it is likely that users would much
prefer write "kvm-arm.mode=nvhe", or "...=protected".

So here you go. This has the added advantage that we can now
always honor the "kvm-arm.mode=protected" option, even when
booting on a VHE system.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: David Brazdil <dbrazdil@google.com>
Link: https://lore.kernel.org/r/20210208095732.3267263-18-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
(cherry picked from commit 1945a067f351debcd2518d9f6039b1835de08dfd
 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/cpufeature)
Signed-off-by: Will Deacon <willdeacon@google.com>
Bug: 175544340
Change-Id: I66d4a5bdb341db7ac6017bd6af97cdddb694d6c3
This commit is contained in:
Marc Zyngier
2021-02-08 09:57:26 +00:00
committed by Will Deacon
parent 77ecc9a1fc
commit 2163159d76
3 changed files with 8 additions and 0 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
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@@ -2274,6 +2274,9 @@
kvm-arm.mode=
[KVM,ARM] Select one of KVM/arm64's modes of operation.
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.
Not valid if the kernel is running in EL2.