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Re: [RFC PATCH 1/5] x86/xen: disable swiotlb for xen pvh
- To: Huang Rui <ray.huang@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 13 Mar 2023 09:56:55 +0100
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- Cc: Alex Deucher <alexander.deucher@xxxxxxx>, Christian König <christian.koenig@xxxxxxx>, Stewart Hildebrand <Stewart.Hildebrand@xxxxxxx>, Xenia Ragiadakou <burzalodowa@xxxxxxxxx>, Honglei Huang <honglei1.huang@xxxxxxx>, Julia Zhang <julia.zhang@xxxxxxx>, Chen Jiqian <Jiqian.Chen@xxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, amd-gfx@xxxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 13 Mar 2023 08:57:11 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12.03.2023 13:01, Huang Rui wrote:
> Xen PVH is the paravirtualized mode and takes advantage of hardware
> virtualization support when possible. It will using the hardware IOMMU
> support instead of xen-swiotlb, so disable swiotlb if current domain is
> Xen PVH.
But the kernel has no way (yet) to drive the IOMMU, so how can it get
away without resorting to swiotlb in certain cases (like I/O to an
address-restricted device)?
Jan
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