[PATCH v5 05/12] KVM: arm: introduce kvm_arm_init/setup/clear_debug

[Christoffer Dall]

On Fri, May 29, 2015 at 10:30:21AM +0100, Alex Bennée wrote:
> This is a precursor for later patches which will need to do more to
> setup debug state before entering the hyp.S switch code. The existing
> functionality for setting mdcr_el2 has been moved out of hyp.S and now
> uses the value kept in vcpu->arch.mdcr_el2.
> 
> As the assembler used to previously mask and preserve MDCR_EL2.HPMN I've
> had to add a mechanism to save the value of mdcr_el2 as a per-cpu
> variable during the initialisation code. The kernel never sets this
> number so we are assuming the bootcode has set up the correct value
> here.
> 
> This also moves the conditional setting of the TDA bit from the hyp code
> into the C code which is currently used for the lazy debug register
> context switch code.
> 
> Signed-off-by: Alex Bennée <alex.bennee at linaro.org>
> 
Reviewed-by: Christoffer Dall <christoffer.dall at linaro.org>