[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [XEN PATCH v3 07/11] xen: arm: vgic: allow delivery of PPIs to guests





On Tue, 26 Nov 2019, 23:18 Stefano Stabellini, <sstabellini@xxxxxxxxxx> wrote:
On Fri, 15 Nov 2019, Stewart Hildebrand wrote:
> Allow vgic_get_hw_irq_desc to be called with a vcpu argument.
>
> Use vcpu argument in vgic_connect_hw_irq.
>
> vgic_connect_hw_irq is called for PPIs and SPIs, not SGIs. Enforce with
> ASSERTs.
>
> Signed-off-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxxxxxxxxxx>
>
> ---
> v3: new patch
>
> ---
> Note: I have only modified the old vgic to allow delivery of PPIs.
> ---
>  xen/arch/arm/gic-vgic.c | 24 ++++++++++++++++--------
>  xen/arch/arm/vgic.c     |  6 +++---
>  2 files changed, 19 insertions(+), 11 deletions(-)
>
> diff --git a/xen/arch/arm/gic-vgic.c b/xen/arch/arm/gic-vgic.c
> index 98c021f1a8..2c66a8fa92 100644
> --- a/xen/arch/arm/gic-vgic.c
> +++ b/xen/arch/arm/gic-vgic.c
> @@ -418,7 +418,7 @@ struct irq_desc *vgic_get_hw_irq_desc(struct domain *d, struct vcpu *v,
>  {
>      struct pending_irq *p;

> -    ASSERT(!v && virq >= 32);
> +    ASSERT((!v && (virq >= 32)) || (!d && v && (virq >= 16) && (virq < 32)));

I don't think !d is necessary for this to work as intended so I would
limit the ASSERT to

  ASSERT((!v && (virq >= 32)) || (v && (virq >= 16) && (virq < 32)));

the caller can always pass v->domain

But then you have the risk to run into d != v->domain. So at least with the ASSERT you document the expectation.

Cheers,



>      if ( !v )
>          v = d->vcpu[0];

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel

 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.