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Re: [PATCH v3 3/8] x86/iommu: snoop control is allowed only by Intel VT-d
- To: Xenia Ragiadakou <burzalodowa@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 16 Jan 2023 17:39:45 +0100
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- Cc: Paul Durrant <paul@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 16 Jan 2023 16:39:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.01.2023 08:04, Xenia Ragiadakou wrote:
> The AMD-Vi driver forces coherent accesses by hardwiring the FC bit to 1.
> Therefore, given that iommu_snoop is used only when the iommu is enabled,
> when Xen is configured with only the AMD iommu enabled, iommu_snoop can be
> reduced to a #define to true.
>
> No functional change intended.
>
> Signed-off-by: Xenia Ragiadakou <burzalodowa@xxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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