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

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Message-ID: <CAK9=C2XyQtHy3__i+fahbi49=j5Z3Z_Bv5s3Ptqjmuaa5q18LA@mail.gmail.com>
Date:   Mon, 2 Oct 2023 21:06:08 +0530
From:   Anup Patel <apatel@...tanamicro.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     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 2, 2023 at 11:57 AM Christoph Hellwig <hch@...radead.org> wrote:
>
> On Tue, Sep 19, 2023 at 09:23:37AM +0530, Anup Patel wrote:
> > The Veyron-V1 CPU supports custom conditional arithmetic and
> > conditional-select/move operations referred to as XVentanaCondOps
> > extension. In fact, QEMU RISC-V also has support for emulating
> > XVentanaCondOps extension.
> >
> > Let us detect XVentanaCondOps extension from ISA string available
> > through DT or ACPI.
>
> Umm, I though Linux/riscv would never support vendor specific
> extensions?
>

We already have few T-Head specific extensions so Linux RISC-V
does allow vendor extensions.

Regards,
Anup