linux-kernel - Re: [PATCH 1/7] RISC-V: Detect XVentanaCondOps from ISA string

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Date:   Wed, 4 Oct 2023 23:49:56 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Anup Patel <apatel@...tanamicro.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Atish Patra <atishp@...shpatra.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Conor Dooley <conor@...nel.org>,
        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 1/7] RISC-V: Detect XVentanaCondOps from ISA string

On Mon, Oct 02, 2023 at 09:06:08PM +0530, Anup Patel wrote:
> > extensions?
> >
> 
> We already have few T-Head specific extensions so Linux RISC-V
> does allow vendor extensions.

Only for kernel internal operation and to actually boot the
chip.  IMHO still the wrong tradeoff, but very different from actually
user visible extensions that will lead to fragmentation of the
ecoysystem.