On Sun, May 8, 2011 at 7:00 AM, Christoffer Dall <cdall at cs.columbia.edu> wrote:
> Hi Catalin.
>
> This patch contains the KVM code including the simple version of the
> initialization API that we discussed.
I missed the discussion, so I'm not really sure what the context is,
but just a quick question:
> +/*
> + * Change the current processor mode to Hyp mode.
> + * You should never return to user space or enable interrupts before calling
> + * kvm_arm_hyp_return.
> + */
> +static inline void kvm_arm_hyp_mode(void)
> +{
> + ? ? ? __asm__ (
> + ? ? ? ? ? ? ? "push ? {lr}\n\t"
> + ? ? ? ? ? ? ? "hvc ? ?#0\n\t"
> + ? ? ? ? ? ? ? "pop ? ?{lr}\n\t");
> +}
> +
> +/*
> + * Return from Hyp mode to Svc mode.
> + */
> +static inline void kvm_arm_hyp_return(void)
> +{
> + ? ? ? __asm__ (
> + ? ? ? ? ? ? ? "push ? {lr}\n\t"
> + ? ? ? ? ? ? ? "hvc ? ?#0\n\t"
> + ? ? ? ? ? ? ? "pop ? ?{lr}\n\t");
> +}
Are these hypercalls that return in a new processor privilege level?
(Also, I don't see them being used anywhere.)
Is the A15 ISA documentation available anywhere yet?
-Hollis
