linux-kernel - Re: [PATCH v2 0/9] KVM RISC-V Conditional Operations

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Message-ID: <20230925-reappear-unkind-7f31acdd82de@spud>
Date:   Mon, 25 Sep 2023 16:36:56 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Anup Patel <apatel@...tanamicro.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Atish Patra <atishp@...shpatra.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shuah Khan <shuah@...nel.org>,
        Andrew Jones <ajones@...tanamicro.com>,
        Mayuresh Chitale <mchitale@...tanamicro.com>,
        devicetree@...r.kernel.org, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 0/9] KVM RISC-V Conditional Operations

On Mon, Sep 25, 2023 at 04:33:15PM +0100, Conor Dooley wrote:
> On Mon, Sep 25, 2023 at 07:08:50PM +0530, Anup Patel wrote:
> > This series extends KVM RISC-V to allow Guest/VM discover and use
> > conditional operations related ISA extensions (namely XVentanaCondOps
> > and Zicond).
> > 
> > To try these patches, use KVMTOOL from riscv_zbx_zicntr_smstateen_condops_v1
> > branch at: https://github.com/avpatel/kvmtool.git
> > 
> > These patches are based upon the latest riscv_kvm_queue and can also be
> > found in the riscv_kvm_condops_v2 branch at:
> > https://github.com/avpatel/linux.git
> > 
> > Changes since v1:
> >  - Rebased the series on riscv_kvm_queue
> >  - Split PATCH1 and PATCH2 of v1 series into two patches
> >  - Added separate test configs for XVentanaCondOps and Zicond in PATCH7
> >    of v1 series.
> > 
> > Anup Patel (9):
> >   dt-bindings: riscv: Add XVentanaCondOps extension entry
> >   RISC-V: Detect XVentanaCondOps from ISA string
> >   dt-bindings: riscv: Add Zicond extension entry
> >   RISC-V: Detect Zicond from ISA string
> 
> For these 4:
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

Actually, now that I think of it, I'm going to temporarily un-review this.
From patch-acceptance.rst:
| Additionally, the RISC-V specification allows implementers to create
| their own custom extensions.  These custom extensions aren't required
| to go through any review or ratification process by the RISC-V
| Foundation.  To avoid the maintenance complexity and potential
| performance impact of adding kernel code for implementor-specific
| RISC-V extensions, we'll only consider patches for extensions that either:
| 
| - Have been officially frozen or ratified by the RISC-V Foundation, or
| - Have been implemented in hardware that is widely available, per standard
|   Linux practice.

The xventanacondops bits don't qualify under the first entry, and I
don't think they qualify under the second yet. Am I wrong?

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