Re: [PATCH] libxl: tooling expects wrong errno

[Ian Jackson <ian.jackson@citrix.com>]

Grzegorz Uriasz writes ("[PATCH] libxl: tooling expects wrong errno"):
> When iommu is not enabled for a given domain then pci passthrough
> hypercalls such as xc_test_assign_device return EOPNOTSUPP.
> The code responsible for this is in "iommu_do_domctl" inside
> xen/drivers/passthrough/iommu.c
> This patch fixes the error message reported by libxl when assigning
> pci devices to domains without iommu.
> 
> Signed-off-by: Grzegorz Uriasz <gorbak25@gmail.com>
> Tested-by: Grzegorz Uriasz <gorbak25@gmail.com>
> ---
>  tools/libxl/libxl_pci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/libxl/libxl_pci.c b/tools/libxl/libxl_pci.c
> index 957ff5c8e9..bc5843b137 100644
> --- a/tools/libxl/libxl_pci.c
> +++ b/tools/libxl/libxl_pci.c
> @@ -1561,7 +1561,7 @@ void libxl__device_pci_add(libxl__egc *egc, uint32_t domid,
>              LOGD(ERROR, domid,
>                   "PCI device %04x:%02x:%02x.%u %s?",
>                   pcidev->domain, pcidev->bus, pcidev->dev, pcidev->func,
> -                 errno == ENOSYS ? "cannot be assigned - no IOMMU"
> +                 errno == EOPNOTSUPP ? "cannot be assigned - no IOMMU"
>                   : "already assigned to a different guest");
>              goto out;
>          }

Thanks.  I have addressed some Xen IOMMU maintainers.  Can you confirm
whether this is right ?

Regards,
Ian.