From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B6A35C54E41 for ; Wed, 6 Mar 2024 17:20:16 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rhuvv-0007oj-Gm; Wed, 06 Mar 2024 12:19:59 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rhuvn-0007j8-Dx for qemu-riscv@nongnu.org; Wed, 06 Mar 2024 12:19:53 -0500 Received: from mail-pl1-x632.google.com ([2607:f8b0:4864:20::632]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1rhuve-0000ZX-39 for qemu-riscv@nongnu.org; Wed, 06 Mar 2024 12:19:49 -0500 Received: by mail-pl1-x632.google.com with SMTP id d9443c01a7336-1dcab44747bso424885ad.1 for ; Wed, 06 Mar 2024 09:19:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1709745580; x=1710350380; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=kyujL+gBJnyXc4btQWbM8dsePlAWzhj7CULgQEyCEx4=; b=Z6T+RA1u/sSCcQv0SpirXSi/XRp8xvPuYgKJ7tbS8HK76sZbZcy/F0OVPLRYwe1BO0 /+MICV2uKZxsfpG4oTNB0ytMDZ46FAEy4EXWTKvuv1SR+ZzQhbYHY7Mg0qfQE/zTGfJb c1Y24o/q1XuUy34Vys4JqRkmnLLUzuH5ONaBx6lCnLMmF2v11V/NVWYnq7TpgB6IOvla uNYudu+Koy8nA5dwLMnZU0x+Bk7KxTHuI3HwfX4vcZoKsC7pwSvgTScDDe0GmWab66Mo GmUPQ0CaHFRuJBr49lbvxNk10IeGrmumDa56uyS4gee+MGQ3y9jYjEl6uQNW9GgDuzrJ MveQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1709745580; x=1710350380; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=kyujL+gBJnyXc4btQWbM8dsePlAWzhj7CULgQEyCEx4=; b=gkijVV9vHvte0AvfAL+nWQZz6jApHiXLnKOfU+Xcmtm6jIPX/nb8zr7j9XRi2fLPUo 1ngPA3TawVdUFR3dIz7Cuul1ZmBIYJJxMgmkdJeYfP75JxGY8AIgYB2HIZEaX766VQ71 6+q7YvjQJEPuPS+S4baary5rbUm3p90VdsrCbE0tGoGUOyK3jOqxaVe3pQzzO2Sx7HlC gEpuXdk1Ppr6EJZFtmIT8taa3TKuHGUy2M43EkP0/Y+XvrLAcQXVvtIlzAMmxscjgbVT K8l4BmPiBTpneQtQsK8owTCYUty7jmHMOsyivN3G+8OmV0x/Rt0ltUMxVcESo2sVCs/g 6OXQ== X-Gm-Message-State: AOJu0Yxje4A+mQ21+9aj1fz5fEpTLEj37ZY+rWsGmkEHs9M9xvAIin0k ItijrpvTz0ikpkA+T79FEA4oSfZm4GTQS/GGxrgdR3trlxnOAq+sBHw7+TRuJAo= X-Google-Smtp-Source: AGHT+IHKwk9FU5UHVHqZe6EyWawkYE/Tu4Q6EETkYSJFRlthHm75kmynDsB47Mu0JP+X7bZYlfp/HQ== X-Received: by 2002:a17:902:d4d1:b0:1dc:fce2:3084 with SMTP id o17-20020a170902d4d100b001dcfce23084mr7214693plg.7.1709745580406; Wed, 06 Mar 2024 09:19:40 -0800 (PST) Received: from grind.dc1.ventanamicro.com ([177.94.15.159]) by smtp.gmail.com with ESMTPSA id p17-20020a170902c71100b001dbb6fef41fsm12869712plp.257.2024.03.06.09.19.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 Mar 2024 09:19:40 -0800 (PST) From: Daniel Henrique Barboza To: qemu-devel@nongnu.org Cc: qemu-riscv@nongnu.org, alistair.francis@wdc.com, bmeng@tinylab.org, liwei1518@gmail.com, zhiwei_liu@linux.alibaba.com, palmer@rivosinc.com, Daniel Henrique Barboza , Richard Henderson Subject: [PATCH v7 1/9] trans_rvv.c.inc: mark_vs_dirty() before loads and stores Date: Wed, 6 Mar 2024 14:19:24 -0300 Message-ID: <20240306171932.549549-2-dbarboza@ventanamicro.com> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240306171932.549549-1-dbarboza@ventanamicro.com> References: <20240306171932.549549-1-dbarboza@ventanamicro.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::632; envelope-from=dbarboza@ventanamicro.com; helo=mail-pl1-x632.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=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-riscv@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-riscv-bounces+qemu-riscv=archiver.kernel.org@nongnu.org Sender: qemu-riscv-bounces+qemu-riscv=archiver.kernel.org@nongnu.org While discussing a problem with how we're (not) setting vstart_eq_zero Richard had the following to say w.r.t the conditional mark_vs_dirty() calls on load/store functions [1]: "I think it's required to have stores set dirty unconditionally, before the operation. Consider a store that traps on the 2nd element, leaving vstart = 2, and exiting to the main loop via exception. The exception enters the kernel page fault handler. The kernel may need to fault in the page for the process, and in the meantime task switch. If vs dirty is not already set, the kernel won't know to save vector state on task switch." Do a mark_vs_dirty() before both loads and stores. [1] https://lore.kernel.org/qemu-riscv/72c7503b-0f43-44b8-aa82-fbafed2aac0c@linaro.org/ Suggested-by: Richard Henderson Signed-off-by: Daniel Henrique Barboza Reviewed-by: Richard Henderson Reviewed-by: Alistair Francis --- target/riscv/insn_trans/trans_rvv.c.inc | 23 ++++++++--------------- 1 file changed, 8 insertions(+), 15 deletions(-) diff --git a/target/riscv/insn_trans/trans_rvv.c.inc b/target/riscv/insn_trans/trans_rvv.c.inc index 742008f58b..b838b8ea5b 100644 --- a/target/riscv/insn_trans/trans_rvv.c.inc +++ b/target/riscv/insn_trans/trans_rvv.c.inc @@ -652,16 +652,14 @@ static bool ldst_us_trans(uint32_t vd, uint32_t rs1, uint32_t data, tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL); } + mark_vs_dirty(s); + fn(dest, mask, base, tcg_env, desc); if (!is_store && s->ztso) { tcg_gen_mb(TCG_MO_ALL | TCG_BAR_LDAQ); } - if (!is_store) { - mark_vs_dirty(s); - } - gen_set_label(over); return true; } @@ -817,11 +815,9 @@ static bool ldst_stride_trans(uint32_t vd, uint32_t rs1, uint32_t rs2, tcg_gen_addi_ptr(dest, tcg_env, vreg_ofs(s, vd)); tcg_gen_addi_ptr(mask, tcg_env, vreg_ofs(s, 0)); - fn(dest, mask, base, stride, tcg_env, desc); + mark_vs_dirty(s); - if (!is_store) { - mark_vs_dirty(s); - } + fn(dest, mask, base, stride, tcg_env, desc); gen_set_label(over); return true; @@ -924,11 +920,9 @@ static bool ldst_index_trans(uint32_t vd, uint32_t rs1, uint32_t vs2, tcg_gen_addi_ptr(index, tcg_env, vreg_ofs(s, vs2)); tcg_gen_addi_ptr(mask, tcg_env, vreg_ofs(s, 0)); - fn(dest, mask, base, index, tcg_env, desc); + mark_vs_dirty(s); - if (!is_store) { - mark_vs_dirty(s); - } + fn(dest, mask, base, index, tcg_env, desc); gen_set_label(over); return true; @@ -1122,11 +1116,10 @@ static bool ldst_whole_trans(uint32_t vd, uint32_t rs1, uint32_t nf, base = get_gpr(s, rs1, EXT_NONE); tcg_gen_addi_ptr(dest, tcg_env, vreg_ofs(s, vd)); + mark_vs_dirty(s); + fn(dest, base, tcg_env, desc); - if (!is_store) { - mark_vs_dirty(s); - } gen_set_label(over); return true; -- 2.43.2