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[109.252.90.8]) by smtp.gmail.com with ESMTPSA id u7-20020a056512040700b005009ab1992esm690431lfk.154.2023.09.15.10.02.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Sep 2023 10:02:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=daynix-com.20230601.gappssmtp.com; s=20230601; t=1694797328; x=1695402128; 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=ZX87+UWr8lrrIsKDRoUiR5UzsqRSt0csBfbQi+d1bi8=; b=07b1JL+XD6ma5HT/9tPTuROsdTEGqjc5CGx1dGFzdWWNZPwBdyHsCoTFLy/ftT6pVT w7FpdOdbgWDov9drTwS16xoKQ8bYVTyy0D0e/ZGArHyVileOfG0Q0FXmkKJzo+6acRGG Pvv9OBTawkBzwQNdxykY9Jraylv9YXnS7pgGdKW0nYBC8VwBC1+OHiPyehDw4mUDWHTk VzVdNBTah7EnKU/KGzPNqhrZk7ON5B/6IlN9jai24EjN70KRW42RzuJ9BtnmgiwTn5Bh 8xZTYR9euul3dvAhKMmqJudVXVc3V6Y+dua8KHWMef4aBSz7BkhnXwedFC/twpTx8Xyh uuTw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694797328; x=1695402128; 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=ZX87+UWr8lrrIsKDRoUiR5UzsqRSt0csBfbQi+d1bi8=; b=dDeTCTczunEr9QKCh7wwNT9j/EQnB5Jp0UG4vR4d/giz+VuOZFx1V/RbVIhic6pIlc lOoV1pSj9GnXJIjmwlLVzewVBwcL5OlzLhf4C+CKbTutac/MDosqoSskkYReUgtGhzEg K0LOu+QgtiKDXaRJVhmjWOCzyLZrkcYnM34mtot2709w0HMD94VZ24DCoShsQxsIc8fP Slkcs7+hwSpueKAUyphgki9OmiWwOP8Z6ZoO5ZcZ5Rta0UEbIotomQzzcsDDJnnt4PNG p4E7yYTJjw5Sk3oQjWDgwSTTwA3e1jNEu7rll3VtA4hHa6OLD3ARRw214ijJXAYeVsP3 kQcw== X-Gm-Message-State: AOJu0Yx1DI6pL5pz/LXUOI4MdNBYlU7WjchSEMCZ2SYKF/V5tkwATHL+ PNOIajZqG3QOEdhKuhwanFO+Kg== X-Google-Smtp-Source: AGHT+IFGetnVODBDR3ayqC8t+QXWUBxmoURbyCJi6/DcpXjJNtGGwbP8IJyqsDRPhYNfS161bL6mZA== X-Received: by 2002:a05:6512:3b9d:b0:500:807a:f1a4 with SMTP id g29-20020a0565123b9d00b00500807af1a4mr2711891lfv.18.1694797327845; Fri, 15 Sep 2023 10:02:07 -0700 (PDT) From: Viktor Prutyanov To: annie.li@oracle.com, akihiko.odaki@daynix.com, kkostiuk@redhat.com Cc: qemu-devel@nongnu.org, peter.maydell@linaro.org, yan@daynix.com, viktor@daynix.com, viktor.prutyanov@phystech.edu Subject: [PATCH v2 4/5] elf2dmp: use Linux mmap with MAP_NORESERVE when possible Date: Fri, 15 Sep 2023 20:01:52 +0300 Message-Id: <20230915170153.10959-5-viktor@daynix.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20230915170153.10959-1-viktor@daynix.com> References: <20230915170153.10959-1-viktor@daynix.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: none client-ip=2a00:1450:4864:20::12b; envelope-from=viktor@daynix.com; helo=mail-lf1-x12b.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=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 @daynix-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1694797387528100002 Content-Type: text/plain; charset="utf-8" Glib's g_mapped_file_new maps file with PROT_READ|PROT_WRITE and MAP_PRIVATE. This leads to premature physical memory allocation of dump file size on Linux hosts and may fail. On Linux, mapping the file with MAP_NORESERVE limits the allocation by available memory. Signed-off-by: Viktor Prutyanov --- contrib/elf2dmp/qemu_elf.c | 68 +++++++++++++++++++++++++++++++------- contrib/elf2dmp/qemu_elf.h | 2 ++ 2 files changed, 58 insertions(+), 12 deletions(-) diff --git a/contrib/elf2dmp/qemu_elf.c b/contrib/elf2dmp/qemu_elf.c index ebda60dcb8..de6ad744c6 100644 --- a/contrib/elf2dmp/qemu_elf.c +++ b/contrib/elf2dmp/qemu_elf.c @@ -165,10 +165,40 @@ static bool check_ehdr(QEMU_Elf *qe) return true; } =20 -int QEMU_Elf_init(QEMU_Elf *qe, const char *filename) +static int QEMU_Elf_map(QEMU_Elf *qe, const char *filename) { +#ifdef CONFIG_LINUX + struct stat st; + int fd; + + printf("Using Linux mmap\n"); + + fd =3D open(filename, O_RDONLY, 0); + if (fd =3D=3D -1) { + eprintf("Failed to open ELF dump file \'%s\'\n", filename); + return 1; + } + + if (fstat(fd, &st)) { + eprintf("Failed to get size of ELF dump file\n"); + close(fd); + return 1; + } + qe->size =3D st.st_size; + + qe->map =3D mmap(NULL, qe->size, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_NORESERVE, fd, 0); + if (qe->map =3D=3D MAP_FAILED) { + eprintf("Failed to map ELF file\n"); + close(fd); + return 1; + } + + close(fd); +#else GError *gerr =3D NULL; - int err =3D 0; + + printf("Using GLib mmap\n"); =20 qe->gmf =3D g_mapped_file_new(filename, TRUE, &gerr); if (gerr) { @@ -179,29 +209,43 @@ int QEMU_Elf_init(QEMU_Elf *qe, const char *filename) =20 qe->map =3D g_mapped_file_get_contents(qe->gmf); qe->size =3D g_mapped_file_get_length(qe->gmf); +#endif + + return 0; +} + +static void QEMU_Elf_unmap(QEMU_Elf *qe) +{ +#ifdef CONFIG_LINUX + munmap(qe->map, qe->size); +#else + g_mapped_file_unref(qe->gmf); +#endif +} + +int QEMU_Elf_init(QEMU_Elf *qe, const char *filename) +{ + if (QEMU_Elf_map(qe, filename)) { + return 1; + } =20 if (!check_ehdr(qe)) { eprintf("Input file has the wrong format\n"); - err =3D 1; - goto out_unmap; + QEMU_Elf_unmap(qe); + return 1; } =20 if (init_states(qe)) { eprintf("Failed to extract QEMU CPU states\n"); - err =3D 1; - goto out_unmap; + QEMU_Elf_unmap(qe); + return 1; } =20 return 0; - -out_unmap: - g_mapped_file_unref(qe->gmf); - - return err; } =20 void QEMU_Elf_exit(QEMU_Elf *qe) { exit_states(qe); - g_mapped_file_unref(qe->gmf); + QEMU_Elf_unmap(qe); } diff --git a/contrib/elf2dmp/qemu_elf.h b/contrib/elf2dmp/qemu_elf.h index b2f0d9cbc9..afa75f10b2 100644 --- a/contrib/elf2dmp/qemu_elf.h +++ b/contrib/elf2dmp/qemu_elf.h @@ -32,7 +32,9 @@ typedef struct QEMUCPUState { int is_system(QEMUCPUState *s); =20 typedef struct QEMU_Elf { +#ifndef CONFIG_LINUX GMappedFile *gmf; +#endif size_t size; void *map; QEMUCPUState **state; --=20 2.21.0