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Message-ID: <20230726113349.3dc1382c.alex.williamson@redhat.com>
Date: Wed, 26 Jul 2023 11:33:49 -0600
From: Alex Williamson <alex.williamson@...hat.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: <jgg@...dia.com>, <kevin.tian@...el.com>, <yi.l.liu@...el.com>,
<joro@...tes.org>, <will@...nel.org>, <robin.murphy@....com>,
<shuah@...nel.org>, <linux-kernel@...r.kernel.org>,
<iommu@...ts.linux.dev>, <kvm@...r.kernel.org>,
<linux-kselftest@...r.kernel.org>, <mjrosato@...ux.ibm.com>,
<farman@...ux.ibm.com>
Subject: Re: [PATCH v8 1/4] vfio: Do not allow !ops->dma_unmap in
vfio_pin/unpin_pages()
On Mon, 24 Jul 2023 12:47:04 -0700
Nicolin Chen <nicolinc@...dia.com> wrote:
> A driver that doesn't implement ops->dma_unmap shouldn't be allowed to do
> vfio_pin/unpin_pages(), though it can use vfio_dma_rw() to access an iova
> range. Deny !ops->dma_unmap cases in vfio_pin/unpin_pages().
>
> Suggested-by: Kevin Tian <kevin.tian@...el.com>
> Reviewed-by: Kevin Tian <kevin.tian@...el.com>
> Reviewed-by: Yi Liu <yi.l.liu@...el.com>
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> ---
> drivers/vfio/vfio_main.c | 4 ++++
> 1 file changed, 4 insertions(+)
I assume these go through iommufd.
Reviewed-by: Alex Williamson <alex.williamson@...hat.com>
>
> diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
> index 902f06e52c48..0da8ed81a97d 100644
> --- a/drivers/vfio/vfio_main.c
> +++ b/drivers/vfio/vfio_main.c
> @@ -1483,6 +1483,8 @@ int vfio_pin_pages(struct vfio_device *device, dma_addr_t iova,
> /* group->container cannot change while a vfio device is open */
> if (!pages || !npage || WARN_ON(!vfio_assert_device_open(device)))
> return -EINVAL;
> + if (!device->ops->dma_unmap)
> + return -EINVAL;
> if (vfio_device_has_container(device))
> return vfio_device_container_pin_pages(device, iova,
> npage, prot, pages);
> @@ -1520,6 +1522,8 @@ void vfio_unpin_pages(struct vfio_device *device, dma_addr_t iova, int npage)
> {
> if (WARN_ON(!vfio_assert_device_open(device)))
> return;
> + if (WARN_ON(!device->ops->dma_unmap))
> + return;
>
> if (vfio_device_has_container(device)) {
> vfio_device_container_unpin_pages(device, iova, npage);
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