On 19.11.2013, at 07:12, Liu Ping Fan <kernelfans@xxxxxxxxx> wrote:
> In some scene, e.g openstack CI, PR guest can trigger "sc 1" frequently,
> this patch optimizes the path by directly delivering BOOK3S_INTERRUPT_SYSCALL
> to HV guest, so powernv can return to HV guest without heavy exit, i.e,
> no need to swap TLB, HTAB,.. etc
>
> Signed-off-by: Liu Ping Fan <pingfank@xxxxxxxxxxxxxxxxxx>
> ---
> v3: add some document
This is v4 I think
> ---
> arch/powerpc/kvm/book3s_hv.c | 10 ++++------
> arch/powerpc/kvm/book3s_hv_rmhandlers.S | 19 ++++++++++++++++++-
> 2 files changed, 22 insertions(+), 7 deletions(-)
>
> diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> index 62a2b5a..1addb1a 100644
> --- a/arch/powerpc/kvm/book3s_hv.c
> +++ b/arch/powerpc/kvm/book3s_hv.c
> @@ -628,12 +628,10 @@ static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
> /* hcall - punt to userspace */
> int i;
>
> - if (vcpu->arch.shregs.msr & MSR_PR) {
> - /* sc 1 from userspace - reflect to guest syscall */
> - kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_SYSCALL);
> - r = RESUME_GUEST;
> - break;
> - }
> + /* hypercall with MSR_PR has already been handled in rmode,
> + * and never reaches here.
> + */
It would've been nice to also mention the real mode hypercall handling, but I can just post a follow-up patch for that one.
Thanks, applied to kvm-ppc-queue.
Alex
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