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([177.94.15.159]) by smtp.gmail.com with ESMTPSA id z10-20020a1709028f8a00b001db7709b322sm2774053plo.298.2024.02.16.03.28.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Feb 2024 03:28:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1708082903; x=1708687703; 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=GUW4y+sVEbMZE51fAwATSVNurT+QNFpidOYUiPbmWtc=; b=E11l5Bsv4YJLb0cHioEx+uSaRXjiLUSz/1RNwaZXJAKpoi5JESpVuRFi6v/37uujHv JrGjsduzbehTy9rg2BSRVJYXmLHP/ugbPjb6a+3U1NkflMLCDm9s1PA1m9fcmlkO/KCP KdiuyOb60qnvwOZC6RNhGuF4qovqA8C1ukZVCFdQN5a/hQR/NPk//hNYKvAU12dWOD2y uyW5VFljNz3x9nGrTjF8EmOZuLv763kJDqPp8vjKhN7gLBKh9jTkdrltz/f4YUUQ0xGP VfNv4fbeyWFL/qamS+DhKpu1A0B2BBAbKT+Vs6vo/WNTkOqSrlTIv5OoF0OA5nADvu0h vIoQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1708082903; x=1708687703; 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=GUW4y+sVEbMZE51fAwATSVNurT+QNFpidOYUiPbmWtc=; b=hr518JP1mfig9Vdt2MeanB1wrXd2JhpZAppohCN3S/Mjt7nt0rspS+eOtRfVbU7n+q IyK58V1tRRfAGJ0ATgwsPhAwC+qtzWMq/H8QLe9VOxODnIc4QMps2KuNbdVGDRL+44vk e+Y8CF8WFFIGEkN5PDCVjo9I3S2c8z63On8ilFjatU9luzim2yZWIwXv2/+ibM6r8WzD u8QdY69VEN5fOdvhVuO/D56F4rnM/7Tsai0SFpAKzgwtp6rAj3pAnNikVyiBBUl4I1G4 q5LKAi54CtqUwe6Q7zPjnLdDb1G4c3ycRP3ZZIrPmOGd06/NCYQ7j5Z/FsxnI9/1YCtq ijRA== X-Gm-Message-State: AOJu0YwdqFD0i4PTRir1m5E1x8o7V+j3Q8NmN+PrqvLgwimr5iCLAO1S YZZNCmxExm3nahhIo+u1X+fihejKwoYMTZhJPwEiGOVjc8UT7l9IMdK3RFYXiPThFFZt+EN+DTL k X-Google-Smtp-Source: AGHT+IF0srGgsFtTapvYCV3qfp9HifG87Iq8D4TbUbTZVvf7iarE6GYYQADx4xKgSwz2aOYmZSDXcQ== X-Received: by 2002:a17:902:fc50:b0:1d8:f016:cfaf with SMTP id me16-20020a170902fc5000b001d8f016cfafmr5380211plb.47.1708082903518; Fri, 16 Feb 2024 03:28:23 -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, richard.henderson@linaro.org, max.chou@sifive.com, Daniel Henrique Barboza Subject: [PATCH 3/3] target/riscv/translate.c: set vstart_eq_zero in mark_vs_dirty() Date: Fri, 16 Feb 2024 08:28:06 -0300 Message-ID: <20240216112806.997948-4-dbarboza@ventanamicro.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240216112806.997948-1-dbarboza@ventanamicro.com> References: <20240216112806.997948-1-dbarboza@ventanamicro.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::634; envelope-from=dbarboza@ventanamicro.com; helo=mail-pl1-x634.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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ventanamicro.com) X-ZM-MESSAGEID: 1708082979955100006 Content-Type: text/plain; charset="utf-8" The 'vstart_eq_zero' flag which is used to determine if some insns, like vector reductor operations, should SIGILL. At this moment the flag is being updated only during cpu_get_tb_cpu_state(), at the start of each translation block. This cadence isn't enough and we're facing situations where a vector instruction successfully updated 'vstart' to zero, but the flag was still marked as 'false', resulting in a SIGILL because instructions are checking the flag. mark_vs_dirty() is called after any instruction changes Vector CSR state, making it a good place to update 'vstart_eq_zero'. Fixes: 8e1ee1fb57 ("target/riscv: rvv-1.0: add translation-time vector cont= ext status") Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1976 Signed-off-by: Daniel Henrique Barboza --- target/riscv/translate.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/target/riscv/translate.c b/target/riscv/translate.c index 177418b2b9..9943538894 100644 --- a/target/riscv/translate.c +++ b/target/riscv/translate.c @@ -652,9 +652,13 @@ static inline void mark_fs_dirty(DisasContext *ctx) { } */ static void mark_vs_dirty(DisasContext *ctx) { + TCGLabel *vstart_zero, *done; TCGv tmp; =20 if (ctx->mstatus_vs !=3D EXT_STATUS_DIRTY) { + vstart_zero =3D gen_new_label(); + done =3D gen_new_label(); + /* Remember the state change for the rest of the TB. */ ctx->mstatus_vs =3D EXT_STATUS_DIRTY; =20 @@ -668,6 +672,24 @@ static void mark_vs_dirty(DisasContext *ctx) tcg_gen_ori_tl(tmp, tmp, MSTATUS_VS); tcg_gen_st_tl(tmp, tcg_env, offsetof(CPURISCVState, mstatus_hs= )); } + + /* + * We can safely make 'vl_eq_vlmax =3D false' if we marked + * VS as dirty with non-zero 'vstart', i.e. there's a fault + * to be handled. If 'vstart' is zero then we should retain + * the existing 'vl_eq_vlmax' - it'll be recalculated on the + * start of the next TB or during vset{i}vl{i} (that forces a + * TB end). + */ + tcg_gen_brcondi_tl(TCG_COND_EQ, cpu_vstart, 0, vstart_zero); + ctx->vstart_eq_zero =3D false; + ctx->vl_eq_vlmax =3D false; + tcg_gen_br(done); + + gen_set_label(vstart_zero); + ctx->vstart_eq_zero =3D true; + + gen_set_label(done); } } #else --=20 2.43.0