linux-kernel - Re: [RFT][PATCH v2 4/9] vfio: Pass in starting IOVA to vfio_pin/unpin

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Message-ID: <YsXNWEanlfb+XliN@Asurada-Nvidia>
Date:   Wed, 6 Jul 2022 10:58:48 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     <kwankhede@...dia.com>, <corbet@....net>, <hca@...ux.ibm.com>,
        <gor@...ux.ibm.com>, <agordeev@...ux.ibm.com>,
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        <intel-gvt-dev@...ts.freedesktop.org>,
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Subject: Re: [RFT][PATCH v2 4/9] vfio: Pass in starting IOVA to
 vfio_pin/unpin_pages API

On Wed, Jul 06, 2022 at 02:49:23PM -0300, Jason Gunthorpe wrote:
> On Tue, Jul 05, 2022 at 11:27:54PM -0700, Nicolin Chen wrote:
> 
> >  These functions call back into the back-end IOMMU module by using the pin_pages
> > diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
> > index 8c67c9aba82d..ea6041fa48ac 100644
> > --- a/drivers/gpu/drm/i915/gvt/kvmgt.c
> > +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
> > @@ -231,16 +231,8 @@ static void intel_gvt_cleanup_vgpu_type_groups(struct intel_gvt *gvt)
> >  static void gvt_unpin_guest_page(struct intel_vgpu *vgpu, unsigned long gfn,
> >  		unsigned long size)
> >  {
> > -	int total_pages;
> > -	int npage;
> > -
> > -	total_pages = roundup(size, PAGE_SIZE) / PAGE_SIZE;
> > -
> > -	for (npage = 0; npage < total_pages; npage++) {
> > -		unsigned long cur_gfn = gfn + npage;
> > -
> > -		vfio_unpin_pages(&vgpu->vfio_device, &cur_gfn, 1);
> > -	}
> > +	vfio_unpin_pages(&vgpu->vfio_device, gfn << PAGE_SHIFT,
> > +			 roundup(size, PAGE_SIZE) / PAGE_SIZE);
> 
> These maths are DIV_ROUND_UP()

Will change in v3.

> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Thanks!