linux-kernel - Re: [RFT 1/2] RISC-V: handle missing "no-map" properties for OpenSBI's PMP protected regions

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Message-ID: <20231219-fernlike-device-4d7186aa4deb@spud>
Date: Tue, 19 Dec 2023 17:18:19 +0000
From: Conor Dooley <conor@...nel.org>
To: Conor Dooley <conor.dooley@...rochip.com>
Cc: "Lad, Prabhakar" <prabhakar.csengg@...il.com>,
	Palmer Dabbelt <palmer@...belt.com>, geert+renesas@...der.be,
	Atish Patra <atishp@...osinc.com>,
	Paul Walmsley <paul.walmsley@...ive.com>, apatel@...tanamicro.com,
	alexghiti@...osinc.com, Bjorn Topel <bjorn@...osinc.com>,
	suagrfillet@...il.com, jeeheng.sia@...rfivetech.com,
	petrtesarik@...weicloud.com, linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	prabhakar.mahadev-lad.rj@...renesas.com
Subject: Re: [RFT 1/2] RISC-V: handle missing "no-map" properties for
 OpenSBI's PMP protected regions

Hey,

On Thu, Dec 07, 2023 at 01:11:23PM +0000, Conor Dooley wrote:
> On Thu, Dec 07, 2023 at 01:02:00PM +0000, Lad, Prabhakar wrote:
> > On Wed, Dec 6, 2023 at 2:26 PM Conor Dooley <conor@...nel.org> wrote:
> > > On Wed, Dec 06, 2023 at 04:52:11AM -0800, Palmer Dabbelt wrote:
> > > > On Thu, 10 Aug 2023 02:07:10 PDT (-0700), Conor Dooley wrote:
> 
> > > > > I'm perfectly happy to drop this series though, if people generally are
> > > > > of the opinion that this sort of firmware workaround is ill-advised.
> > > > > We are unaffected by it, so I certainly have no pressure to have
> > > > > something working here. It's my desire not to be user-hostile that
> > > > > motivated this patch.
> > > >
> > > > IIUC you guys and Reneas are the only ones who have hardware that might be
> > > > in a spot where users aren't able to update the firmware (ie, it's out in
> > > > production somewhere).
> > >
> > > I dunno if we can really keep thinking like that though. In terms of
> > > people who have devicetrees in the kernel and stuff available in western
> > > catalog distribution, sure.
> > > I don't think we can assume that that covers all users though, certainly
> > > the syntacore folks pop up every now and then, and I sure hope that
> > > Andes etc have larger customer bases than the in-kernel users would
> > > suggest.
> > >
> > > > So I'm adding Geert, though he probably saw this
> > > > months ago...
> > >
> > > Prabhakar might be a good call on that front. I'm not sure if the
> > > Renesas stuff works on affected versions of OpenSBI though, guess it
> > > depends on the sequencing of the support for the non-coherent stuff and
> > > when this bug was fixed.
> > >
> > ATM, I dont think there are any users who are using the upstream
> > kernel + OpenSBI (apart from me and Geert!). Currently the customers
> > are using the BSP releases.
> 
> That doesn't really answer whether or not you (and your customers) are
> using an affected version of the vendor OpenSBI?
> The affected range for OpenSBI itself is [v0.8 to v1.3).

Did you perhaps miss this mail Prabhakar?

Cheers,
Conor.

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