On 27/02/2020 14:34, Jan Beulich wrote:
> --- a/xen/drivers/passthrough/amd/iommu_init.c
> +++ b/xen/drivers/passthrough/amd/iommu_init.c
> @@ -1364,6 +1364,7 @@ static int __init amd_iommu_prepare_one(
> int __init amd_iommu_prepare(bool xt)
> {
> struct amd_iommu *iommu;
> + bool no_xt = false;
I think the logic would be easier to follow if this was has_xt, with
inverted meaning. However...
> int rc = -ENODEV;
>
> BUG_ON( !iommu_found() );
> @@ -1400,9 +1401,8 @@ int __init amd_iommu_prepare(bool xt)
> if ( rc )
> goto error_out;
>
> - rc = -ENODEV;
> - if ( xt && (!iommu->features.flds.ga_sup ||
> !iommu->features.flds.xt_sup) )
> - goto error_out;
> + if ( !iommu->features.flds.ga_sup || !iommu->features.flds.xt_sup )
> + no_xt = true;
> }
>
> for_each_amd_iommu ( iommu )
... the contents of this loop depends on the early exit path you've just
deleted.
In the case of x2apic not being available, we'll still set {ga,xt}_en to
the caller requested value.
~Andrew
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