[PATCH 1/4] arm: kvm: move kvm_vgic_global_state out of .text section

[Marc Zyngier]

On 10/02/17 17:16, Ard Biesheuvel wrote:
> The kvm_vgic_global_state struct contains a static key which is
> written to by jump_label_init() at boot time. So in preparation of
> making .text regions truly (well, almost truly) read-only, mark
> kvm_vgic_global_state __ro_after_init so it moves to the .rodata
> section instead.
> 
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
> ---
>  virt/kvm/arm/vgic/vgic.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
> index 6440b56ec90e..2f373455ed4e 100644
> --- a/virt/kvm/arm/vgic/vgic.c
> +++ b/virt/kvm/arm/vgic/vgic.c
> @@ -29,7 +29,9 @@
>  #define DEBUG_SPINLOCK_BUG_ON(p)
>  #endif
>  
> -struct vgic_global __section(.hyp.text) kvm_vgic_global_state = {.gicv3_cpuif = STATIC_KEY_FALSE_INIT,};
> +struct vgic_global kvm_vgic_global_state __ro_after_init = {
> +	.gicv3_cpuif = STATIC_KEY_FALSE_INIT,
> +};
>  
>  /*
>   * Locking order is always:
> 

I guess that's a nice way to find out if someone is playing with this
structure (which indeed shouldn't change once KVM has initialized).

Acked-by: Marc Zyngier <marc.zyngier at arm.com>

	M.
-- 
Jazz is not dead. It just smells funny...