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

[Tianyu Lan]

On 12/2/2021 10:43 PM, Wei Liu wrote:
> 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 for suggestion. Will update.