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[24.113.166.229]) by smtp.gmail.com with ESMTPSA id 17-20020a170902ee5100b0019339f3368asm10757555plo.3.2023.03.22.08.07.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Mar 2023 08:07:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1679497679; 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=fXNPlCQTG4Q+TjXBR7MVbKgvdvefxmvjapXjC24wVMI=; b=T3dyVMMOzUItdSj38r3iKSVE/xo8/sV3BNryvESme5fdvW2qJKMTmncOlVJ3Sx1Hde qgUA3kXvYkMW7PP+ug+V6MrmTvvGrj4S3OhOsx+CTbhWUmlY+TkMcwMN6h01m223XpUX sA+SxVHHz9X2fX3DVeylD2ucV1PRcXWr0UyxzMVILaDczLAeI9zywN1khxk/frJqY3pr oq5NZLPCfOfRM09vFXAukLW86QGcx9Wi5SYOke2tGT6D4Z9ZeEUN3Y+jhynt6VRO4ZbA lGWRO3JFAnvELJyLMCbSolSZPXn46vFGEsIcAWf7fmWqrl6LtwBql4bQTa1aguISinu6 FQ6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679497679; 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=fXNPlCQTG4Q+TjXBR7MVbKgvdvefxmvjapXjC24wVMI=; b=tbo5msfYoLuxxF2TK0S+d8jjweHo3ib0gYXItSGeWyFcvwGc2/UA579SUHrc2M7aix tYv2i9ob5Z20o5z7PCzNe0NFJYVnj2IBURM2QjyIBm41SqPk1yBaBvA0m54jmMMm30BB swuUPt6Syoe0uoM3V/wrkvhNXlCvGjtqLHCkGLggURH7Quif0yA6C6pY8/4CF/xE3hwQ rtNeSoMWPdY0ypdu6BV7FNsdcWHfBPmAGpaKIrKUq/MNMURNF49BGnN6j4yHpe7J5EJr va4Qd6xiKtNuAAewQB/0rrZ/F3FeS1G3rnQCHUx3Cf8WvMx6iwRkCx0n7scsbWi5fFDv Wvhw== X-Gm-Message-State: AO0yUKWrQ7ta5GEczGZ/bL9XaFOe0YmFCblptsOL4QuIgQ1lo9HdcF91 j8qL5kOpBk2TGKrKLjZpB/SL9lKB89Ik5i9h0XU= X-Google-Smtp-Source: AK7set/HQCW7Uu84UIMwxKL55fvfWjpbjKubfdFMZbSx35CrClVv3yq2dp1LX7zHObwM9YGWPM/7Pg== X-Received: by 2002:a17:902:e8c3:b0:19f:3e9b:7527 with SMTP id v3-20020a170902e8c300b0019f3e9b7527mr2434439plg.61.1679497679477; Wed, 22 Mar 2023 08:07:59 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: cota@braap.org, peter.maydell@linaro.org Subject: [PATCH for-8.0 11/11] linux-user/arm: Take more care allocating commpage Date: Wed, 22 Mar 2023 08:07:44 -0700 Message-Id: <20230322150744.175010-12-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230322150744.175010-1-richard.henderson@linaro.org> References: <20230322150744.175010-1-richard.henderson@linaro.org> 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=richard.henderson@linaro.org; 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 autolearn=ham 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 @linaro.org) X-ZM-MESSAGEID: 1679497807631100003 Content-Type: text/plain; charset="utf-8" User setting of -R reserved_va can lead to an assertion failure in page_set_flags. Sanity check the value of reserved_va and print an error message instead. Do not allocate a commpage at all for m-profile cpus. Signed-off-by: Richard Henderson --- linux-user/elfload.c | 37 +++++++++++++++++++++++++++---------- 1 file changed, 27 insertions(+), 10 deletions(-) diff --git a/linux-user/elfload.c b/linux-user/elfload.c index b068676340..0529430b1d 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -422,12 +422,32 @@ enum { =20 static bool init_guest_commpage(void) { - abi_ptr commpage =3D HI_COMMPAGE & -qemu_host_page_size; - void *want =3D g2h_untagged(commpage); - void *addr =3D mmap(want, qemu_host_page_size, PROT_READ | PROT_WRITE, - MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0); + ARMCPU *cpu =3D ARM_CPU(thread_cpu); + abi_ptr want =3D HI_COMMPAGE & TARGET_PAGE_MASK; + abi_ptr addr; =20 - if (addr =3D=3D MAP_FAILED) { + /* + * M-profile allocates maximum of 2GB address space, so can never + * allocate the commpage. Skip it. + */ + if (arm_feature(&cpu->env, ARM_FEATURE_M)) { + return true; + } + + /* + * If reserved_va does not cover the commpage, we get an assert + * in page_set_flags. Produce an intelligent error instead. + */ + if (reserved_va !=3D 0 && want + TARGET_PAGE_SIZE - 1 > reserved_va) { + error_report("Allocating guest commpage: -R 0x%" PRIx64 " too smal= l", + (uint64_t)reserved_va + 1); + exit(EXIT_FAILURE); + } + + addr =3D target_mmap(want, TARGET_PAGE_SIZE, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0); + + if (addr =3D=3D -1) { perror("Allocating guest commpage"); exit(EXIT_FAILURE); } @@ -436,15 +456,12 @@ static bool init_guest_commpage(void) } =20 /* Set kernel helper versions; rest of page is 0. */ - __put_user(5, (uint32_t *)g2h_untagged(0xffff0ffcu)); + put_user_u32(5, 0xffff0ffcu); =20 - if (mprotect(addr, qemu_host_page_size, PROT_READ)) { + if (target_mprotect(addr, qemu_host_page_size, PROT_READ | PROT_EXEC))= { perror("Protecting guest commpage"); exit(EXIT_FAILURE); } - - page_set_flags(commpage, commpage | ~qemu_host_page_mask, - PAGE_READ | PAGE_EXEC | PAGE_VALID); return true; } =20 --=20 2.34.1