Message ID | 20230503070656.1746170-1-richard.henderson@linaro.org |
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Wed, 03 May 2023 00:06:57 -0700 (PDT) Received: from stoup.Home ([2a02:c7c:74db:8d00:c01d:9d74:b630:9087]) by smtp.gmail.com with ESMTPSA id q3-20020a1cf303000000b003f3157988f8sm921184wmq.26.2023.05.03.00.06.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 May 2023 00:06:57 -0700 (PDT) From: Richard Henderson <richard.henderson@linaro.org> To: qemu-devel@nongnu.org Cc: git@xen0n.name, gaosong@loongson.cn, philmd@linaro.org, qemu-arm@nongnu.org, qemu-riscv@nongnu.org, qemu-s390x@nongnu.org Subject: [PATCH v4 00/57] tcg: Improve atomicity support Date: Wed, 3 May 2023 08:05:59 +0100 Message-Id: <20230503070656.1746170-1-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::436; envelope-from=richard.henderson@linaro.org; helo=mail-wr1-x436.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: <qemu-devel.nongnu.org> List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe> List-Archive: <https://lists.nongnu.org/archive/html/qemu-devel> List-Post: <mailto:qemu-devel@nongnu.org> List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help> List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=subscribe> Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org |
Series |
tcg: Improve atomicity support
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On Wed, 3 May 2023 at 08:10, Richard Henderson <richard.henderson@linaro.org> wrote: > > v1: https://lore.kernel.org/qemu-devel/20221118094754.242910-1-richard.henderson@linaro.org/ > v2: https://lore.kernel.org/qemu-devel/20230216025739.1211680-1-richard.henderson@linaro.org/ > v3: https://lore.kernel.org/qemu-devel/20230425193146.2106111-1-richard.henderson@linaro.org/ > > Based-on: 20230503065729.1745843-1-richard.henderson@linaro.org > ("[PATCH v4 00/54] tcg: Simplify calls to load/store helpers") > > The main objective here is to support Arm FEAT_LSE2, which says that any > single memory access that does not cross a 16-byte boundary is atomic. > This is the MO_ATOM_WITHIN16 control. > > While I'm touching all of this, a secondary objective is to handle the > atomicity of the IBM machines. Both Power and s390x treat misaligned > accesses as atomic on the lsb of the pointer. For instance, an 8-byte > access at ptr % 8 == 4 will appear as two atomic 4-byte accesses, and > ptr % 4 == 2 will appear as four 2-byte accesses. > This is the MO_ATOM_SUBALIGN control. > > By default, acceses are atomic only if aligned, which is the current > behaviour of the tcg code generator (mostly, anyway, there were bugs). > This is the MO_ATOM_IFALIGN control. > > Further, one can say that a large memory access is really a set of > contiguous smaller accesses, and we need not provide more atomicity > than that (modulo MO_ATOM_WITHIN16). This is the MO_ATMAX_* control. I've reviewed as much of this series as I'm going to -- I left a few patches for people who know more about ppc/s390 than me. thanks -- PMM