From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pj1-x102c.google.com (mail-pj1-x102c.google.com [IPv6:2607:f8b0:4864:20::102c]) by sourceware.org (Postfix) with ESMTPS id 35C7A3858D28 for ; Fri, 31 Mar 2023 21:03:09 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 35C7A3858D28 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=rivosinc.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=rivosinc.com Received: by mail-pj1-x102c.google.com with SMTP id x15so21760413pjk.2 for ; Fri, 31 Mar 2023 14:03:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20210112.gappssmtp.com; s=20210112; t=1680296588; h=content-transfer-encoding:mime-version:message-id:to:from:cc :in-reply-to:subject:date:from:to:cc:subject:date:message-id :reply-to; bh=eRoG/++uv8vB5WI3ZofR660MT2DfsM48Wit3qg1eqQ4=; b=UgO5tP2NJ9WNYE/6cP2FLrFyW0vGA0i4xd7qnZyTm8LIt/cjieAMvQNcLqWyMBLe9F OMKjUSKy5HhFp+Z/IOpnGS2d5KMd0msCqwDFxXJet4KrC0Dk2//gsVSGqLyPsxrbyVTC 2gSGc3VeZDtaPSlVbnd2zEmhtmyuurOoc88j7YbX8iKyI5v0bNrKnRGZ9Qfv1hM4OLYS zwmOMzIAMyQlTKW2lN5I1ceszFUXwU+C6UK5AvAEIb+L5jkx5PBb+31LewLUeyS8IrYp y6Jl7v/NI6Hwk4VBsxHTWH2TaoSn003T6iHTgqRWKXu3TQpmK2WT53yWbH8rbWzhgSJO c9gw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680296588; h=content-transfer-encoding:mime-version:message-id:to:from:cc :in-reply-to:subject:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=eRoG/++uv8vB5WI3ZofR660MT2DfsM48Wit3qg1eqQ4=; b=gATX+OgtnRVKewlcTvwhT5PyKVHv9whiUVYZ9l0du4Q3a3Bz0We+ITCRzidJ8/J3DC UjPgdRVeN29QKKrbY0L5o+kCGiyYkmlGC2JndLq2Wn2wAvO/lqDCHfKKPHJqm0z908Um ZXJ6iE/ZT6m6tkSmq1SbutRKQ37BfHfVvU0S3rmJ/+WVvtizJWh4UT788+UlVSZ8Ha5U ahmg+H6mjhLhlffZnhoiUsv3V2kh1AoSW17Nc2hPt+nmh9QvUp8mvGfaYJ2dv9ksJ+14 Y6pTulgm9LgGuzB9JD0VPtB1vJSKG81KKlXwwaU/e1EWp2+KWhDtUDs22QTzr46tkQTA jxFQ== X-Gm-Message-State: AAQBX9dA/Qm4ZChgIUF4pnap8mE3i9Oy7yE7FZeSOdQeWFrVob69Pp1+ HCatIQrrGsBeQ1bdzIlyg5yzhg== X-Google-Smtp-Source: AKy350aqsH1SCiSkUIsShYwUuey8mBDcImFbdQFkEoMkyZy6SADP2BwrRvCFefQKWQ0ESHU3kXt2zg== X-Received: by 2002:a17:90a:7306:b0:237:b702:499f with SMTP id m6-20020a17090a730600b00237b702499fmr31836423pjk.22.1680296588203; Fri, 31 Mar 2023 14:03:08 -0700 (PDT) Received: from localhost ([50.221.140.188]) by smtp.gmail.com with ESMTPSA id k5-20020a170902760500b001992fc0a8eesm1981823pll.174.2023.03.31.14.03.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 31 Mar 2023 14:03:06 -0700 (PDT) Date: Fri, 31 Mar 2023 14:03:06 -0700 (PDT) X-Google-Original-Date: Fri, 31 Mar 2023 14:03:00 PDT (-0700) Subject: Re: [PATCH v2 0/3] RISC-V: ifunced memcpy using new kernel hwprobe interface In-Reply-To: <44f66aa6-346f-99c7-0a9c-de9fa0bcd490@gmail.com> CC: adhemerval.zanella@linaro.org, Evan Green , libc-alpha@sourceware.org, slewis@rivosinc.com, Vineet Gupta From: Palmer Dabbelt To: jeffreyalaw@gmail.com Message-ID: Mime-Version: 1.0 (MHng) Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-6.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On Fri, 31 Mar 2023 13:19:19 PDT (-0700), jeffreyalaw@gmail.com wrote: [just snipping the rest so we can focus on Jeff's ask, the other stuff is interesting but a longer reply and we'd probably want to fork the thread anyway...] > So perhaps we can narrow down the scope right now even further. Can we > agree to try and settle on a base implementation with no ISA extensions > and no uarch variants? ISTM if we can settle on those implementations > that it should be usable immediately by the RV community at large and > doesn't depend on the kernel->glibc interface work. That base includes V and ZBB? In that case we'd be dropping support for all existing hardware, which I would be very much against.