[RFC PATCH 3/9] KVM: PPC: Book3S 64: add hcall interrupt handler

[Fabiano Rosas]

Nicholas Piggin <npiggin at gmail.com> writes:

> Add a separate hcall entry point. This can be used to deal with the
> different calling convention.
>
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>

Reviewed-by: Fabiano Rosas <farosas at linux.ibm.com>

> ---
>  arch/powerpc/kernel/exceptions-64s.S | 4 ++--
>  arch/powerpc/kvm/book3s_64_entry.S   | 4 ++++
>  2 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
> index e6f7fc7c61a1..c25395b5921a 100644
> --- a/arch/powerpc/kernel/exceptions-64s.S
> +++ b/arch/powerpc/kernel/exceptions-64s.S
> @@ -2028,13 +2028,13 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
>  	 * Requires __LOAD_FAR_HANDLER beause kvmppc_interrupt lives
>  	 * outside the head section.
>  	 */
> -	__LOAD_FAR_HANDLER(r10, kvmppc_interrupt)
> +	__LOAD_FAR_HANDLER(r10, kvmppc_hcall)
>  	mtctr   r10
>  	ld	r10,PACA_EXGEN+EX_R10(r13)
>  	bctr
>  #else
>  	ld	r10,PACA_EXGEN+EX_R10(r13)
> -	b       kvmppc_interrupt
> +	b       kvmppc_hcall
>  #endif
>  #endif
>
> diff --git a/arch/powerpc/kvm/book3s_64_entry.S b/arch/powerpc/kvm/book3s_64_entry.S
> index 8e7216f3c3ee..3b894b90862f 100644
> --- a/arch/powerpc/kvm/book3s_64_entry.S
> +++ b/arch/powerpc/kvm/book3s_64_entry.S
> @@ -9,6 +9,10 @@
>  /*
>   * We come here from the first-level interrupt handlers.
>   */
> +.global	kvmppc_hcall
> +.balign IFETCH_ALIGN_BYTES
> +kvmppc_hcall:
> +
>  .global	kvmppc_interrupt
>  .balign IFETCH_ALIGN_BYTES
>  kvmppc_interrupt: