On Tue, Sep 22, 2020 at 09:49:04PM +0100, David Brazdil wrote:

this_cpu_ptr is meant for use in kernel proper because it selects between
TPIDR_EL1/2 based on nVHE/VHE. __hyp_this_cpu_ptr was used in hyp to always
select TPIDR_EL2. Unify all users behind this_cpu_ptr and friends by
selecting _EL2 register under __KVM_NVHE_HYPERVISOR__. VHE continues
selecting the register using alternatives.

Under CONFIG_DEBUG_PREEMPT, the kernel helpers perform a preemption check
which is omitted by the hyp helpers. Preserve the behavior for nVHE by
overriding the corresponding macros under __KVM_NVHE_HYPERVISOR__. Extend
the checks into VHE hyp code.

Acked-by: Andrew Scull <redacted>
Signed-off-by: David Brazdil <redacted>
---
 arch/arm64/include/asm/kvm_asm.h          | 20 ----------------
 arch/arm64/include/asm/percpu.h           | 28 +++++++++++++++++++++--
 arch/arm64/kvm/hyp/include/hyp/debug-sr.h |  4 ++--
 arch/arm64/kvm/hyp/include/hyp/switch.h   |  8 +++----
 arch/arm64/kvm/hyp/nvhe/switch.c          |  2 +-
 arch/arm64/kvm/hyp/vhe/switch.c           |  2 +-
 arch/arm64/kvm/hyp/vhe/sysreg-sr.c        |  4 ++--
 7 files changed, 36 insertions(+), 32 deletions(-)

Looks good, thanks for the respin!

Acked-by: Will Deacon <will@kernel.org>

Will

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