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From: Andrew Scull <ascull@google.com>
To: Bin Meng <bmeng.cn@gmail.com>
Cc: "U-Boot Mailing List" <u-boot@lists.denx.de>,
	"Simon Glass" <sjg@chromium.org>,
	"Alistair Delva" <adelva@google.com>,
	"Keir Fraser" <keirf@google.com>,
	"Pierre-Clément Tosi" <ptosi@google.com>
Subject: Re: [PATCH 09/11] pci: Add function to validate PCI address range
Date: Fri, 25 Mar 2022 10:26:21 +0000	[thread overview]
Message-ID: <CADcWuH3Jdc3C=ECLn7V1y3ySdBys8JE3F92JumYKE18gxepRDQ@mail.gmail.com> (raw)
In-Reply-To: <CAEUhbmXF_RmsYH_Xot5inn6f2cVnZFz+tEoj378iShnWiep=Aw@mail.gmail.com>

On Fri, 25 Mar 2022 at 07:14, Bin Meng <bmeng.cn@gmail.com> wrote:
>
> On Sun, Mar 20, 2022 at 7:42 PM Andrew Scull <ascull@google.com> wrote:
> >
> > Add a function to convert a PCI address range to a physical address
> > range. The address range is validated to ensure it is contained within
> > one of the PCI address regions and that the whole range can be indexed
> > from the resulting physical address.
>
> I am not sure if we need to provide such an API given there is already
> dm_pci_bus_to_phys() and friends. Not sure we really need this new API
> to add a check against the range.
...
> If we really need this, I believe we can do some refactoring on the
> existing _dm_pci_bus_to_phys() to provide the new capability you
> wanted.

A big reason is to check the range fits in the region, not just a
single pointer. It looks like evolving the existing API might not be
too tricky for that.

The bit that really caused me trouble was that the PCI driver adds
system memory as identity mapped regions. But that system memory
hasn't been declared as part of the PCI bus so why is it being added?
I want to remove that but don't know the background, or have the
ability to test PCI will still work properly.

We can't allow a virtio device to claim it has buffers in the middle
of system memory and then have the driver blindly corrupt that region
of memory, so there'll need to be a way to prevent that.

> > + * @size:      Size of the addressrange
>
> need a space before 'range'

Ack.

> Please add a test case in test/dm/pci.c to cover this new API.

I was just learning about the sandbox testing, I'll take a look.

  reply	other threads:[~2022-03-25 10:26 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-20 11:41 [PATCH 00/11] virtio: pci: Add and fix consistency checks Andrew Scull
2022-03-20 11:41 ` [PATCH 01/11] virtio: pci: Fix discovery of device config length Andrew Scull
2022-03-24  9:32   ` Bin Meng
2022-03-20 11:41 ` [PATCH 02/11] virtio: pci: Bounds check device config access Andrew Scull
2022-03-24 14:07   ` Bin Meng
2022-03-20 11:41 ` [PATCH 03/11] virtio: pci: Bounds check notification writes Andrew Scull
2022-03-24 14:18   ` Bin Meng
2022-03-24 16:24     ` Andrew Scull
2022-03-25  1:41       ` Bin Meng
2022-03-20 11:41 ` [PATCH 04/11] virtio: pci: Check virtio common config size Andrew Scull
2022-03-24 14:22   ` Bin Meng
2022-03-20 11:41 ` [PATCH 05/11] virtio: pci: Check virtio capability is in bounds Andrew Scull
2022-03-24 15:24   ` Bin Meng
2022-03-24 16:27     ` Andrew Scull
2022-03-25  1:27       ` Bin Meng
2022-03-20 11:41 ` [PATCH 06/11] virtio: pci: Read entire capability into memory Andrew Scull
2022-03-25  4:31   ` Bin Meng
2022-03-25  7:03     ` Andrew Scull
2022-03-25  7:51       ` Bin Meng
2022-03-25  9:18         ` Andrew Scull
2022-03-25 10:25           ` Bin Meng
2022-03-28 14:28             ` Andrew Scull
2022-03-20 11:41 ` [PATCH 07/11] virtio: pci: Check virtio configs are mapped Andrew Scull
2022-03-25  4:38   ` Bin Meng
2022-03-25  7:07     ` Andrew Scull
2022-03-25  7:19       ` Bin Meng
2022-03-20 11:41 ` [PATCH 08/11] pci: Check region ranges are addressable Andrew Scull
2022-03-25  7:14   ` Bin Meng
2022-03-20 11:41 ` [PATCH 09/11] pci: Add function to validate PCI address range Andrew Scull
2022-03-25  7:14   ` Bin Meng
2022-03-25 10:26     ` Andrew Scull [this message]
2022-03-20 11:41 ` [PATCH 10/11] virtio: pci: Check mapped range is in a PCI region Andrew Scull
2022-03-25  7:14   ` Bin Meng
2022-03-20 11:41 ` [PATCH 11/11] virtio: pci: Allow exclusion of legacy driver Andrew Scull
2022-03-25  7:14   ` Bin Meng

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