[PATCH 02/20] arm64: KVM: Implement HVC_RESET_VECTORS stub hypercall
James Morse
james.morse at arm.com
Mon Feb 20 08:54:30 PST 2017
Hi Marc,
On 17/02/17 15:44, Marc Zyngier wrote:
> In order to restore HYP mode to its original condition, KVM currently
> implements __kvm_hyp_reset(). As we're moving towards a hyp-stub
> defined API, it becomes necessary to implement HVC_RESET_VECTORS.
>
> This patch adds the HVC_RESET_VECTORS hypercall to the KVM init
> code, which so far lacked any form of hypercall support.
> diff --git a/arch/arm64/kvm/hyp-init.S b/arch/arm64/kvm/hyp-init.S
> index 6b29d3d9e1f2..948f331c7f32 100644
> --- a/arch/arm64/kvm/hyp-init.S
> +++ b/arch/arm64/kvm/hyp-init.S
> @@ -58,6 +59,9 @@ __invalid:
> * x2: HYP vectors
> */
> __do_hyp_init:
> + /* Check for a stub HVC call */
> + cmp x2, #HVC_STUB_HCALL_NR
Nit: x2 -> x0?
> + b.lo __kvm_handle_stub_hvc
>
> msr ttbr0_el2, x0
>
> @@ -119,6 +123,9 @@ __do_hyp_init:
> eret
> ENDPROC(__kvm_hyp_init)
>
> +ENTRY(__kvm_handle_stub_hvc)
> + cmp x0, #HVC_RESET_VECTORS
> + b.ne 1f
> /*
> * Reset kvm back to the hyp stub.
> */
Thanks,
James
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