KVM: arm64: Stash OSLSR_EL1 in the cpu context

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An upcoming change to KVM will emulate the OS Lock from the PoV of the
guest. Add OSLSR_EL1 to the cpu context and handle reads using the
stored value. Define some mnemonics for for handling the OSLM field and
use them to make the reset value of OSLSR_EL1 more readable.

Wire up a custom handler for writes from userspace and prevent any of
the invariant bits from changing. Note that the OSLK bit is not
invariant and will be made writable by the aforementioned change.

Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Oliver Upton <oupton@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220203174159.2887882-3-oupton@google.com

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Oliver Upton 2022-02-03 17:41:55 +00:00 • committed by Marc Zyngier

parent e2ffceaae5

commit d42e26716d

3 changed files with 30 additions and 7 deletions

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1

arch/arm64/include/asm/kvm_host.h

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arch/arm64/include/asm/sysreg.h

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31

arch/arm64/kvm/sys_regs.c

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