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Wed, 08 Oct 2025 12:17:32 -0700 (PDT) From: Daan De Meyer To: qemu-devel@nongnu.org Cc: Gerd Hoffmann , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Peter Maydell , qemu-arm@nongnu.org, Daan De Meyer Subject: [PATCH] Add support for zboot images compressed with zstd Date: Wed, 8 Oct 2025 21:17:16 +0200 Message-ID: <20251008191716.3005164-1-daan.j.demeyer@gmail.com> X-Mailer: git-send-email 2.51.0 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=2a00:1450:4864:20::32c; envelope-from=daan.j.demeyer@gmail.com; helo=mail-wm1-x32c.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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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 @gmail.com) X-ZM-MESSAGEID: 1759951125498116600 Content-Type: text/plain; charset="utf-8" Signed-off-by: Daan De Meyer --- hw/arm/boot.c | 2 +- hw/core/loader.c | 36 ++++++++++++++++++++++++------------ hw/nvram/fw_cfg.c | 2 +- include/hw/loader.h | 2 +- 4 files changed, 27 insertions(+), 15 deletions(-) diff --git a/hw/arm/boot.c b/hw/arm/boot.c index e77d8679d8..c0dec0343a 100644 --- a/hw/arm/boot.c +++ b/hw/arm/boot.c @@ -826,7 +826,7 @@ static uint64_t load_aarch64_image(const char *filename= , hwaddr mem_base, ssize_t size; =20 /* On aarch64, it's the bootloader's job to uncompress the kernel. */ - size =3D load_image_gzipped_buffer(filename, LOAD_IMAGE_MAX_GUNZIP_BYT= ES, + size =3D load_image_gzipped_buffer(filename, LOAD_IMAGE_MAX_DECOMPRESS= ED_BYTES, &buffer); =20 if (size < 0) { diff --git a/hw/core/loader.c b/hw/core/loader.c index 477661a025..a2647b0c9a 100644 --- a/hw/core/loader.c +++ b/hw/core/loader.c @@ -67,6 +67,11 @@ =20 #include =20 +#ifdef CONFIG_ZSTD +#include +#include +#endif + static int roms_loaded; =20 /* return the size or -1 if error */ @@ -796,8 +801,8 @@ ssize_t load_image_gzipped_buffer(const char *filename,= uint64_t max_sz, goto out; } =20 - if (max_sz > LOAD_IMAGE_MAX_GUNZIP_BYTES) { - max_sz =3D LOAD_IMAGE_MAX_GUNZIP_BYTES; + if (max_sz > LOAD_IMAGE_MAX_DECOMPRESSED_BYTES) { + max_sz =3D LOAD_IMAGE_MAX_DECOMPRESSED_BYTES; } =20 data =3D g_malloc(max_sz); @@ -882,14 +887,6 @@ ssize_t unpack_efi_zboot_image(uint8_t **buffer, ssize= _t *size) return 0; } =20 - if (strcmp(header->compression_type, "gzip") !=3D 0) { - fprintf(stderr, - "unable to handle EFI zboot image with \"%.*s\" compressio= n\n", - (int)sizeof(header->compression_type) - 1, - header->compression_type); - return -1; - } - ploff =3D ldl_le_p(&header->payload_offset); plsize =3D ldl_le_p(&header->payload_size); =20 @@ -898,8 +895,23 @@ ssize_t unpack_efi_zboot_image(uint8_t **buffer, ssize= _t *size) return -1; } =20 - data =3D g_malloc(LOAD_IMAGE_MAX_GUNZIP_BYTES); - bytes =3D gunzip(data, LOAD_IMAGE_MAX_GUNZIP_BYTES, *buffer + ploff, p= lsize); + data =3D g_malloc(LOAD_IMAGE_MAX_DECOMPRESSED_BYTES); + + if (strcmp(header->compression_type, "gzip") =3D=3D 0) { + bytes =3D gunzip(data, LOAD_IMAGE_MAX_DECOMPRESSED_BYTES, *buffer = + ploff, plsize); +#ifdef CONFIG_ZSTD + } else if (strcmp(header->compression_type, "zstd") =3D=3D 0) { + size_t ret =3D ZSTD_decompress(data, LOAD_IMAGE_MAX_DECOMPRESSED_B= YTES, *buffer + ploff, plsize); + bytes =3D ZSTD_isError(ret) ? -1 : (ssize_t) ret; +#endif + } else { + fprintf(stderr, + "unable to handle EFI zboot image with \"%.*s\" compressio= n\n", + (int)sizeof(header->compression_type) - 1, + header->compression_type); + return -1; + } + if (bytes < 0) { fprintf(stderr, "failed to decompress EFI zboot image\n"); g_free(data); diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c index aa24050493..af3b112524 100644 --- a/hw/nvram/fw_cfg.c +++ b/hw/nvram/fw_cfg.c @@ -1115,7 +1115,7 @@ void load_image_to_fw_cfg(FWCfgState *fw_cfg, uint16_= t size_key, =20 if (try_decompress) { size =3D load_image_gzipped_buffer(image_name, - LOAD_IMAGE_MAX_GUNZIP_BYTES, &dat= a); + LOAD_IMAGE_MAX_DECOMPRESSED_BYTES= , &data); } =20 if (size =3D=3D (size_t)-1) { diff --git a/include/hw/loader.h b/include/hw/loader.h index c96b5e141c..24b91ba02b 100644 --- a/include/hw/loader.h +++ b/include/hw/loader.h @@ -80,7 +80,7 @@ ssize_t load_image_mr(const char *filename, MemoryRegion = *mr); * load_image_gzipped_buffer() will read. It prevents * g_malloc() in those functions from allocating a huge amount of memory. */ -#define LOAD_IMAGE_MAX_GUNZIP_BYTES (256 << 20) +#define LOAD_IMAGE_MAX_DECOMPRESSED_BYTES (256 << 20) =20 ssize_t load_image_gzipped_buffer(const char *filename, uint64_t max_sz, uint8_t **buffer); --=20 2.51.0