linux-kernel - 答复: [PATCH v1 01/14] vfio: Create vfio_fs

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Date:   Mon, 12 Apr 2021 04:09:46 +0000
From:   "Zengtao (B)" <prime.zeng@...ilicon.com>
To:     Alex Williamson <alex.williamson@...hat.com>
CC:     "cohuck@...hat.com" <cohuck@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "peterx@...hat.com" <peterx@...hat.com>
Subject: 答复: [PATCH v1 01/14] vfio: Create vfio_fs_type with inode per device

> -----邮件原件-----
> 发件人: Alex Williamson [mailto:alex.williamson@...hat.com]
> 发送时间: 2021年4月9日 22:24
> 收件人: Zengtao (B) <prime.zeng@...ilicon.com>
> 抄送: cohuck@...hat.com; kvm@...r.kernel.org;
> linux-kernel@...r.kernel.org; jgg@...dia.com; peterx@...hat.com
> 主题: Re: [PATCH v1 01/14] vfio: Create vfio_fs_type with inode per device
> 
> On Fri, 9 Apr 2021 04:54:23 +0000
> "Zengtao (B)" <prime.zeng@...ilicon.com> wrote:
> 
> > > -----邮件原件-----
> > > 发件人: Alex Williamson [mailto:alex.williamson@...hat.com]
> > > 发送时间: 2021年3月9日 5:47
> > > 收件人: alex.williamson@...hat.com
> > > 抄送: cohuck@...hat.com; kvm@...r.kernel.org;
> > > linux-kernel@...r.kernel.org; jgg@...dia.com; peterx@...hat.com
> > > 主题: [PATCH v1 01/14] vfio: Create vfio_fs_type with inode per device
> > >
> > > By linking all the device fds we provide to userspace to an address
> > > space through a new pseudo fs, we can use tools like
> > > unmap_mapping_range() to zap all vmas associated with a device.
> > >
> > > Suggested-by: Jason Gunthorpe <jgg@...dia.com>
> > > Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> > > ---
> > >  drivers/vfio/vfio.c |   54
> > > +++++++++++++++++++++++++++++++++++++++++++++++++++
> > >  1 file changed, 54 insertions(+)
> > >
> > > diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index
> > > 38779e6fd80c..abdf8d52a911 100644
> > > --- a/drivers/vfio/vfio.c
> > > +++ b/drivers/vfio/vfio.c
> > > @@ -32,11 +32,18 @@
> > >  #include <linux/vfio.h>
> > >  #include <linux/wait.h>
> > >  #include <linux/sched/signal.h>
> > > +#include <linux/pseudo_fs.h>
> > > +#include <linux/mount.h>
> > Minor: keep the headers in alphabetical order.
> 
> They started out that way, but various tree-wide changes ignoring that, and
> likely oversights on my part as well, has left us with numerous breaks in that
> rule already.
> 
> > >
> > >  #define DRIVER_VERSION	"0.3"
> > >  #define DRIVER_AUTHOR	"Alex Williamson
> <alex.williamson@...hat.com>"
> > >  #define DRIVER_DESC	"VFIO - User Level meta-driver"
> > >
> > > +#define VFIO_MAGIC 0x5646494f /* "VFIO" */
> > Move to include/uapi/linux/magic.h ?
> 
> Hmm, yeah, I suppose it probably should go there.  Thanks.
> 
> FWIW, I'm still working on a next version of this series, currently struggling
> how to handle an arbitrary number of vmas per user DMA mapping.  Thanks,
> 

Will do some testing on our platform, and want to make sure the issue
 I reported is included : 
 https://patchwork.kernel.org/project/kvm/patch/1615201890-887-1-git-send-email-prime.zeng@hisilicon.com/
 
 Thanks
 zengtao


> Alex