[PATCH 24/37] KVM: arm64: Prepare to handle traps on deferred EL0 sysregs

[Julien Thierry]

On 12/10/17 11:41, Christoffer Dall wrote:
> We can trap access to ACTLR_EL1 which we can later defer to only
> save/restore during vcpu_load and vcpu_put, so let's read the value
> directly from the CPU when necessary.
> 
> Signed-off-by: Christoffer Dall <christoffer.dall at linaro.org>
> ---
>   arch/arm64/kvm/sys_regs_generic_v8.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kvm/sys_regs_generic_v8.c b/arch/arm64/kvm/sys_regs_generic_v8.c
> index 969ade1..348f227 100644
> --- a/arch/arm64/kvm/sys_regs_generic_v8.c
> +++ b/arch/arm64/kvm/sys_regs_generic_v8.c
> @@ -38,7 +38,10 @@ static bool access_actlr(struct kvm_vcpu *vcpu,
>   	if (p->is_write)
>   		return ignore_write(vcpu, p);
>   
> -	p->regval = vcpu_sys_reg(vcpu, ACTLR_EL1);
> +	if (vcpu->arch.sysregs_loaded_on_cpu)
> +		read_sysreg(actlr_el1);

Did you mean "p->regval = read_sysreg(actlr_el1);" ?

> +	else
> +		p->regval = vcpu_sys_reg(vcpu, ACTLR_EL1);
>   	return true;
>   }
>   
> 

-- 
Julien Thierry