[PATCH v6 19/26] arm64: KVM: Move stashing of x0/x1 into the vector code itself

[Andrew Jones]

On Wed, Mar 14, 2018 at 04:50:42PM +0000, Marc Zyngier wrote:
> All our useful entry points into the hypervisor are starting by
> saving x0 and x1 on the stack. Let's move those into the vectors
> by introducing macros that annotate whether a vector is valid or
> not, thus indicating whether we want to stash registers or not.
> 
> The only drawback is that we now also stash registers for el2_error,
> but this should never happen, and we pop them back right at the
> start of the handling sequence.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>
> ---
>  arch/arm64/kvm/hyp/hyp-entry.S | 56 ++++++++++++++++++++++++------------------
>  1 file changed, 32 insertions(+), 24 deletions(-)
>

Reviewed-by: Andrew Jones <drjones at redhat.com>