Messages in this thread | | | From | Leyfoon Tan <> | Subject | RE: arch/riscv: SV48 patch series questions | Date | Thu, 2 Jun 2022 05:43:42 +0000 |
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> -----Original Message----- > From: Palmer Dabbelt <palmer@dabbelt.com> > Sent: Thursday, 2 June, 2022 11:44 AM > To: Leyfoon Tan <leyfoon.tan@starfivetech.com> > Cc: alexandre.ghiti@canonical.com; linux-riscv@lists.infradead.org; linux- > kernel@vger.kernel.org > Subject: Re: arch/riscv: SV48 patch series questions > > On Fri, 27 May 2022 02:37:34 PDT (-0700), leyfoon.tan@starfivetech.com > wrote: > > Hi Palmer > > > > Alex's "Introduce sv48 support without relocatable kernel" patch series in > [1] was partially merged to Linux v5.17. But there are 4 patches are not > merged (Patch-10 to 13). > > > > May I know what is the plan for these patches? Will them merged to next > v5.19 merging window? Or do you expect any changes for these patches or > Alex needs resend with rebase to latest kernel version? > > I just saw this as I was digging up Alex's old email to reply to, all but #13 are > now on for-next. > > > Note, we would like to use the Patch-13 in this series. > > Is your use case a CPU errata? If so I think we should just go ahead and add > that errata via the existing errata mechanism. If you've got some other use > case, do you mind elaborating? From that other thread it sounds like a > command-line argument is the way to go for folks who want to turn this off > more dynamically, but happy to hear if you've got something different in > mind. It is not CPU errata. RISC-V cpu can have sv39, sv48 or even sv57. If it is a heterogenous system, cpu cores in the system might have different sv. Eg: one cpu can be sv39 and another core is sv48. In this case, auto detection is not work. So, Patch-13 can help in this use case.
> > > Patches not merged: > > [v3,10/13] riscv: Improve virtual kernel memory layout dump [v3,11/13] > > Documentation: riscv: Add sv48 description to VM layout [v3,12/13] > > riscv: Initialize thread pointer before calling C functions [v3,13/13] > > riscv: Allow user to downgrade to sv39 when hw supports sv48 if !KASAN > > > > [1]: > > https://patchwork.kernel.org/project/linux-riscv/cover/20211206104657. > > 433304-1-alexandre.ghiti@canonical.com/ > >
Thanks.
Regards Ley Foon
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