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Re: [PATCH V3 3/5] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM
- To: Tianyu Lan <ltykernel@xxxxxxxxx>
- From: Wei Liu <wei.liu@xxxxxxxxxx>
- Date: Thu, 2 Dec 2021 14:43:36 +0000
- Cc: kys@xxxxxxxxxxxxx, haiyangz@xxxxxxxxxxxxx, sthemmin@xxxxxxxxxxxxx, wei.liu@xxxxxxxxxx, decui@xxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, hpa@xxxxxxxxx, jgross@xxxxxxxx, sstabellini@xxxxxxxxxx, boris.ostrovsky@xxxxxxxxxx, joro@xxxxxxxxxx, will@xxxxxxxxxx, davem@xxxxxxxxxxxxx, kuba@xxxxxxxxxx, jejb@xxxxxxxxxxxxx, martin.petersen@xxxxxxxxxx, arnd@xxxxxxxx, hch@xxxxxxxxxxxxx, m.szyprowski@xxxxxxxxxxx, robin.murphy@xxxxxxx, Tianyu.Lan@xxxxxxxxxxxxx, thomas.lendacky@xxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, michael.h.kelley@xxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, vkuznets@xxxxxxxxxx, brijesh.singh@xxxxxxx, konrad.wilk@xxxxxxxxxx, hch@xxxxxx, parri.andrea@xxxxxxxxx, dave.hansen@xxxxxxxxx
- Delivery-date: Thu, 02 Dec 2021 14:43:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Wed, Dec 01, 2021 at 11:02:54AM -0500, Tianyu Lan wrote:
[...]
> diff --git a/arch/x86/xen/pci-swiotlb-xen.c b/arch/x86/xen/pci-swiotlb-xen.c
> index 46df59aeaa06..30fd0600b008 100644
> --- a/arch/x86/xen/pci-swiotlb-xen.c
> +++ b/arch/x86/xen/pci-swiotlb-xen.c
> @@ -4,6 +4,7 @@
>
> #include <linux/dma-map-ops.h>
> #include <linux/pci.h>
> +#include <linux/hyperv.h>
> #include <xen/swiotlb-xen.h>
>
> #include <asm/xen/hypervisor.h>
> @@ -91,6 +92,6 @@ int pci_xen_swiotlb_init_late(void)
> EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late);
>
> IOMMU_INIT_FINISH(pci_xen_swiotlb_detect,
> - NULL,
> + hyperv_swiotlb_detect,
It is not immediately obvious why this is needed just by reading the
code. Please consider copying some of the text in the commit message to
a comment here.
Thanks,
Wei.
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