Re: [PATCH V3 3/5] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM

Wei Liu
2021-12-02T14:43:50Z

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.