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[97.126.123.70]) by smtp.gmail.com with ESMTPSA id 13sm3740195pfi.78.2020.01.29.15.50.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Jan 2020 15:50:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=42DTzkxwIkIPw/1LzUPJIt4v8UUQuVZ50M1s+EwARmU=; b=PnSPkNOso8gryQy6Y4ADutI8RnPNerJgzp3bLA6jxVTlI1k5tXZOOMLmG4LurRMT6v dZjS1O2pYiMfo9Rsm/QVeF9+Z+Opo7Y+mvMnfuPZCzvlJaNi5PinwvJc68lX6gOuaF0h TgWuf2TdHK9aOrObogca7YMI97dELWFiRCBJX9y6VgxhLI4qUwS5/I1z7GML5VZ5xWY+ C5OfgHkusqzeAwcAv9EQfRx4V7mpIaRHrd4SFXWYAn+ozb5ii/6OOtZBBjEa4HGb/cfs LAIqgVEKAAtQjuHFVpB4Nq+EHRYhgBaViujKtvk7GSQoWqurmf+qeAWDuUIgi3yZK69H NSPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=42DTzkxwIkIPw/1LzUPJIt4v8UUQuVZ50M1s+EwARmU=; b=avX2SiHAejiTkEv4u9Naitgrhl+OnAppLILIw6I+y7XJCFKcb9ILCHt636P344157i vwm3nPdkv5qh5DJWwe42nmaFLAxRONW1/t9a293h4nHTzXBKCES1QCLR3s6G1ybwyjZg zFdRymaiNl1XWL1+pqQ3g82SGPyI+Zna1zFtvEKM1LprqkHgtypuCJjDUytIg5zQ2CYo ArDXsPVJLEGpA2/rMTVdcHFY4xFyOxNoPaR8hUTPFuQgmj/ELX3WkJKVf5XeBVss2Vqa 8FGCeGJx563u5xDO0ReaEilvrfyQA15/1s9PvX/hvWpWOmhkTqZ7qS8Wj1g9cinFGsCe n9Vw== X-Gm-Message-State: APjAAAVBXkWpAkT8MBAdqJIFgXRwbm2onQSpEWlGjvpSGxIkY2M8cujl jT/moU2nKTzzjgWgdncmNCL36zvKYMA= X-Google-Smtp-Source: APXvYqyse4L2CD8eq+DLjlpGRNQvOPf5WQZlst9bMrT5X44hr9LiFBjwTXNciyy4zHdDI5z4QAJICw== X-Received: by 2002:a63:3e05:: with SMTP id l5mr1660915pga.293.1580341845530; Wed, 29 Jan 2020 15:50:45 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 2/4] target/ppc: Use probe_access for LMW, STMW Date: Wed, 29 Jan 2020 15:50:38 -0800 Message-Id: <20200129235040.24022-3-richard.henderson@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200129235040.24022-1-richard.henderson@linaro.org> References: <20200129235040.24022-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::542 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: hsp.cat7@gmail.com, qemu-ppc@nongnu.org, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Use a minimum number of mmu lookups for the contiguous bytes that are accessed. If the lookup succeeds, we can finish the operation with host addresses only. Reported-by: Howard Spoelstra Signed-off-by: Richard Henderson --- target/ppc/mem_helper.c | 45 +++++++++++++++++++++++++++++------------ 1 file changed, 32 insertions(+), 13 deletions(-) diff --git a/target/ppc/mem_helper.c b/target/ppc/mem_helper.c index 508d472a2f..e7d3a79d96 100644 --- a/target/ppc/mem_helper.c +++ b/target/ppc/mem_helper.c @@ -84,26 +84,45 @@ static void *probe_contiguous(CPUPPCState *env, target_= ulong addr, uint32_t nb, =20 void helper_lmw(CPUPPCState *env, target_ulong addr, uint32_t reg) { - for (; reg < 32; reg++) { - if (needs_byteswap(env)) { - env->gpr[reg] =3D bswap32(cpu_ldl_data_ra(env, addr, GETPC())); - } else { - env->gpr[reg] =3D cpu_ldl_data_ra(env, addr, GETPC()); + uintptr_t raddr =3D GETPC(); + int mmu_idx =3D cpu_mmu_index(env, false); + void *host =3D probe_contiguous(env, addr, (32 - reg) * 4, + MMU_DATA_LOAD, mmu_idx, raddr); + + if (likely(host)) { + /* Fast path -- the entire operation is in RAM at host. */ + for (; reg < 32; reg++) { + env->gpr[reg] =3D (uint32_t)ldl_be_p(host); + host +=3D 4; + } + } else { + /* Slow path -- at least some of the operation requires i/o. */ + for (; reg < 32; reg++) { + env->gpr[reg] =3D cpu_ldl_mmuidx_ra(env, addr, mmu_idx, raddr); + addr =3D addr_add(env, addr, 4); } - addr =3D addr_add(env, addr, 4); } } =20 void helper_stmw(CPUPPCState *env, target_ulong addr, uint32_t reg) { - for (; reg < 32; reg++) { - if (needs_byteswap(env)) { - cpu_stl_data_ra(env, addr, bswap32((uint32_t)env->gpr[reg]), - GETPC()); - } else { - cpu_stl_data_ra(env, addr, (uint32_t)env->gpr[reg], GETPC()); + uintptr_t raddr =3D GETPC(); + int mmu_idx =3D cpu_mmu_index(env, false); + void *host =3D probe_contiguous(env, addr, (32 - reg) * 4, + MMU_DATA_STORE, mmu_idx, raddr); + + if (likely(host)) { + /* Fast path -- the entire operation is in RAM at host. */ + for (; reg < 32; reg++) { + stl_be_p(host, env->gpr[reg]); + host +=3D 4; + } + } else { + /* Slow path -- at least some of the operation requires i/o. */ + for (; reg < 32; reg++) { + cpu_stl_mmuidx_ra(env, addr, env->gpr[reg], mmu_idx, raddr); + addr =3D addr_add(env, addr, 4); } - addr =3D addr_add(env, addr, 4); } } =20 --=20 2.20.1