Re: [Xen-devel] [PATCH 14/24] PVH xen: interrupt/event-channel delivery to PVH

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Jul 17, 2013 at 07:32:58PM -0700, Mukesh Rathor wrote:
> PVH uses HVMIRQ_callback_vector for interrupt delivery. Also, change
> hvm_vcpu_has_pending_irq() as PVH doesn't use vlapic emulation, so we

FYI. Yet. It could in the future if we want to use that and the callback
together. But that is a seperate discussion and you can avoid that for now.

> can skip vlapic checks in the function. Moreover, a PVH guest installs IDT
> natively, and sets callback via for interrupt delivery during boot. Once

The 'sets callback via for' does not make much sense. Did you mean:

"and sets a callback vector for interrupt delivery during boot"?

> that is done, it receives interrupts via the callback.
> 
> Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>

You can add
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

with the change I mentioned above.
> ---
>  xen/arch/x86/hvm/irq.c       |    3 +++
>  xen/arch/x86/hvm/vmx/intr.c  |    8 ++++++--
>  xen/include/asm-x86/domain.h |    2 +-
>  xen/include/asm-x86/event.h  |    2 +-
>  4 files changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/xen/arch/x86/hvm/irq.c b/xen/arch/x86/hvm/irq.c
> index 9eae5de..92fb245 100644
> --- a/xen/arch/x86/hvm/irq.c
> +++ b/xen/arch/x86/hvm/irq.c
> @@ -405,6 +405,9 @@ struct hvm_intack hvm_vcpu_has_pending_irq(struct vcpu *v)
>           && vcpu_info(v, evtchn_upcall_pending) )
>          return hvm_intack_vector(plat->irq.callback_via.vector);
>  
> +    if ( is_pvh_vcpu(v) )
> +        return hvm_intack_none;
> +
>      if ( vlapic_accept_pic_intr(v) && plat->vpic[0].int_output )
>          return hvm_intack_pic(0);
>  
> diff --git a/xen/arch/x86/hvm/vmx/intr.c b/xen/arch/x86/hvm/vmx/intr.c
> index e376f3c..ce42950 100644
> --- a/xen/arch/x86/hvm/vmx/intr.c
> +++ b/xen/arch/x86/hvm/vmx/intr.c
> @@ -165,6 +165,9 @@ static int nvmx_intr_intercept(struct vcpu *v, struct 
> hvm_intack intack)
>  {
>      u32 ctrl;
>  
> +    if ( is_pvh_vcpu(v) )
> +        return 0;
> +
>      if ( nvmx_intr_blocked(v) != hvm_intblk_none )
>      {
>          enable_intr_window(v, intack);
> @@ -219,8 +222,9 @@ void vmx_intr_assist(void)
>          return;
>      }
>  
> -    /* Crank the handle on interrupt state. */
> -    pt_vector = pt_update_irq(v);
> +    if ( !is_pvh_vcpu(v) )
> +        /* Crank the handle on interrupt state. */
> +        pt_vector = pt_update_irq(v);
>  
>      do {
>          intack = hvm_vcpu_has_pending_irq(v);
> diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
> index 22a72df..21a9954 100644
> --- a/xen/include/asm-x86/domain.h
> +++ b/xen/include/asm-x86/domain.h
> @@ -16,7 +16,7 @@
>  #define is_pv_32on64_domain(d) (is_pv_32bit_domain(d))
>  #define is_pv_32on64_vcpu(v)   (is_pv_32on64_domain((v)->domain))
>  
> -#define is_hvm_pv_evtchn_domain(d) (is_hvm_domain(d) && \
> +#define is_hvm_pv_evtchn_domain(d) (!is_pv_domain(d) && \
>          d->arch.hvm_domain.irq.callback_via_type == HVMIRQ_callback_vector)
>  #define is_hvm_pv_evtchn_vcpu(v) (is_hvm_pv_evtchn_domain(v->domain))
>  
> diff --git a/xen/include/asm-x86/event.h b/xen/include/asm-x86/event.h
> index 06057c7..7ed5812 100644
> --- a/xen/include/asm-x86/event.h
> +++ b/xen/include/asm-x86/event.h
> @@ -18,7 +18,7 @@ int hvm_local_events_need_delivery(struct vcpu *v);
>  static inline int local_events_need_delivery(void)
>  {
>      struct vcpu *v = current;
> -    return (is_hvm_vcpu(v) ? hvm_local_events_need_delivery(v) :
> +    return (!is_pv_vcpu(v) ? hvm_local_events_need_delivery(v) :
>              (vcpu_info(v, evtchn_upcall_pending) &&
>               !vcpu_info(v, evtchn_upcall_mask)));
>  }
> -- 
> 1.7.2.3
> 
> 
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