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

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Date: Tue, 19 Dec 2023 17:27:42 +0000
From: Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
To: Conor Dooley <conor@...nel.org>, Conor Dooley <conor.dooley@...rochip.com>
CC: "Lad, Prabhakar" <prabhakar.csengg@...il.com>, Palmer Dabbelt
	<palmer@...belt.com>, "geert+renesas@...der.be" <geert+renesas@...der.be>,
	Atish Patra <atishp@...osinc.com>, Paul Walmsley <paul.walmsley@...ive.com>,
	"apatel@...tanamicro.com" <apatel@...tanamicro.com>, "alexghiti@...osinc.com"
	<alexghiti@...osinc.com>, Bjorn Topel <bjorn@...osinc.com>,
	"suagrfillet@...il.com" <suagrfillet@...il.com>,
	"jeeheng.sia@...rfivetech.com" <jeeheng.sia@...rfivetech.com>,
	"petrtesarik@...weicloud.com" <petrtesarik@...weicloud.com>,
	"linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [RFT 1/2] RISC-V: handle missing "no-map" properties for
 OpenSBI's PMP protected regions

Hi Conor,

> -----Original Message-----
> From: Conor Dooley <conor@...nel.org>
> Sent: Tuesday, December 19, 2023 5:18 PM
> 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
> <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?
> 
Oops sorry for that.

I can confirm the BSP version used by the customers is v1.0 [0].

[0] https://github.com/renesas-rz/rz_opensbi/commits/work/OpenSBI-PMA/

Cheers,
Prabhakar