KVM: arm64: Stop save/restoring ACTLR_EL1

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KVM sets HCR_EL2.TACR via HCR_GUEST_FLAGS. This means ACTLR* accesses
from the guest are always trapped, and always return the value in the
sys_regs array.

The guest can't change the value of these registers, so we are
save restoring the reset value, which came from the host.

Stop save/restoring this register. Keep the storage for this register
in sys_regs[] as this is how the value is exposed to user-space,
removing it would break migration.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200529150656.7339-4-james.morse@arm.com

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James Morse 2020-05-29 15:06:56 +00:00 • committed by Marc Zyngier

parent ef5a294be8

commit e8679fedd0

2 changed files with 0 additions and 4 deletions

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arch/arm64/kvm/hyp/sysreg-sr.c

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2

arch/arm64/kvm/sys_regs.c

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