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

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Message-ID: <YsXg10vCMBMaOM9V@Asurada-Nvidia>
Date:   Wed, 6 Jul 2022 12:21:59 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     <kwankhede@...dia.com>, <corbet@....net>, <hca@...ux.ibm.com>,
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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

> > +	vfio_unpin_pages(&vgpu->vfio_device, gfn << PAGE_SHIFT,
> > +			 roundup(size, PAGE_SIZE) / PAGE_SIZE);
> 
> These maths are DIV_ROUND_UP()

Actually I see two places in this file doing the same roundup.
So I am going to add a prep patch in v3 to fix them separately.