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Re: [XEN PATCH 11/12] xen/vpci: add defensive code
- To: Federico Serafini <federico.serafini@xxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 10 Sep 2024 16:51:31 +0200
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- Cc: consulting@xxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 10 Sep 2024 14:51:36 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 10.09.2024 12:09, Federico Serafini wrote:
> --- a/xen/drivers/vpci/msix.c
> +++ b/xen/drivers/vpci/msix.c
> @@ -364,6 +364,8 @@ static int adjacent_read(const struct domain *d, const
> struct vpci_msix *msix,
>
> default:
> ASSERT_UNREACHABLE();
> + spin_unlock(&vpci->lock);
> + return X86EMUL_UNHANDLEABLE;
> }
> spin_unlock(&vpci->lock);
>
> @@ -512,6 +514,8 @@ static int adjacent_write(const struct domain *d, const
> struct vpci_msix *msix,
>
> default:
> ASSERT_UNREACHABLE();
> + spin_unlock(&vpci->lock);
> + return X86EMUL_UNHANDLEABLE;
> }
> spin_unlock(&vpci->lock);
Both functions only ever return X86EMUL_OKAY right now. I expect your
change wants to be simple "break" insertions, yet I wonder why these
functions aren't returning void then.
Jan
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