Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751630AbdHXITB (ORCPT ); Thu, 24 Aug 2017 04:19:01 -0400 Received: from mail-pg0-f41.google.com ([74.125.83.41]:37885 "EHLO mail-pg0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751519AbdHXIS7 (ORCPT ); Thu, 24 Aug 2017 04:18:59 -0400 From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com, bauerman@linux.vnet.ibm.com, dhowells@redhat.com, vgoyal@redhat.com, herbert@gondor.apana.org.au, davem@davemloft.net, akpm@linux-foundation.org, mpe@ellerman.id.au, dyoung@redhat.com, bhe@redhat.com, arnd@arndb.de, ard.biesheuvel@linaro.org Cc: kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, AKASHI Takahiro Subject: [PATCH 10/14] arm64: kexec_file: load initrd, device-tree and purgatory segments Date: Thu, 24 Aug 2017 17:18:07 +0900 Message-Id: <20170824081811.19299-11-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20170824081811.19299-1-takahiro.akashi@linaro.org> References: <20170824081811.19299-1-takahiro.akashi@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8438 Lines: 319 load_other_segments() sets up and adds all the memory segments necessary other than kernel, including initrd, device-tree blob and purgatory. Most of the code was borrowed from kexec-tools' counterpart. In addition, arch_kexec_image_probe(), arch_kexec_image_load() and arch_kexec_kernel_verify_sig() are stubs for supporting multiple types of kernel image formats. Signed-off-by: AKASHI Takahiro Cc: Catalin Marinas Cc: Will Deacon --- arch/arm64/include/asm/kexec.h | 18 +++ arch/arm64/kernel/machine_kexec_file.c | 255 +++++++++++++++++++++++++++++++++ 2 files changed, 273 insertions(+) diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h index e17f0529a882..ebc4aaa707ae 100644 --- a/arch/arm64/include/asm/kexec.h +++ b/arch/arm64/include/asm/kexec.h @@ -93,6 +93,24 @@ static inline void crash_prepare_suspend(void) {} static inline void crash_post_resume(void) {} #endif +#ifdef CONFIG_KEXEC_FILE +#define ARCH_HAS_KIMAGE_ARCH + +struct kimage_arch { + void *dtb_buf; +}; + +struct kimage; +extern int setup_dtb(struct kimage *image, + unsigned long initrd_load_addr, unsigned long initrd_len, + char *cmdline, unsigned long cmdline_len, + char **dtb_buf, size_t *dtb_buf_len); +extern int load_other_segments(struct kimage *image, + unsigned long kernel_load_addr, + char *initrd, unsigned long initrd_len, + char *cmdline, unsigned long cmdline_len); +#endif + #endif /* __ASSEMBLY__ */ #endif diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c index 183f7776d6dd..cd12e451e474 100644 --- a/arch/arm64/kernel/machine_kexec_file.c +++ b/arch/arm64/kernel/machine_kexec_file.c @@ -16,8 +16,78 @@ #include #include #include +#include +#include +#include +#include #include #include +#include + +static int __dt_root_addr_cells; +static int __dt_root_size_cells; + +static struct kexec_file_ops *kexec_file_loaders[0]; + +int arch_kexec_kernel_image_probe(struct kimage *image, void *buf, + unsigned long buf_len) +{ + struct kexec_file_ops *fops; + int i, ret; + + for (i = 0; i < ARRAY_SIZE(kexec_file_loaders); i++) { + fops = kexec_file_loaders[i]; + if (!fops || !fops->probe) + continue; + + ret = fops->probe(buf, buf_len); + if (!ret) { + image->fops = fops; + return 0; + } + } + + return -ENOEXEC; +} + +void *arch_kexec_kernel_image_load(struct kimage *image) +{ + if (!image->fops || !image->fops->load) + return ERR_PTR(-ENOEXEC); + + return image->fops->load(image, image->kernel_buf, + image->kernel_buf_len, image->initrd_buf, + image->initrd_buf_len, image->cmdline_buf, + image->cmdline_buf_len); +} + +int arch_kimage_file_post_load_cleanup(struct kimage *image) +{ + vfree(image->arch.dtb_buf); + image->arch.dtb_buf = NULL; + + vfree(image->arch.elf_headers); + image->arch.elf_headers = NULL; + image->arch.elf_headers_sz = 0; + + if (!image->fops || !image->fops->cleanup) + return 0; + + return image->fops->cleanup(image->image_loader_data); +} + +#ifdef CONFIG_KEXEC_VERIFY_SIG +int arch_kexec_kernel_verify_sig(struct kimage *image, void *kernel, + unsigned long kernel_len) +{ + if (!image->fops || !image->fops->verify_sig) { + pr_debug("kernel loader does not support signature verification.\n"); + return -EKEYREJECTED; + } + + return image->fops->verify_sig(kernel, kernel_len); +} +#endif /* * Apply purgatory relocations. @@ -197,3 +267,188 @@ int arch_kexec_apply_relocations_add(const Elf64_Ehdr *ehdr, return 0; } + +int arch_kexec_walk_mem(struct kexec_buf *kbuf, int (*func)(u64, u64, void *)) +{ + if (kbuf->image->type == KEXEC_TYPE_CRASH) + return walk_iomem_res_desc(crashk_res.desc, + IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY, + crashk_res.start, crashk_res.end, + kbuf, func); + else if (kbuf->top_down) + return walk_system_ram_res_rev(0, ULONG_MAX, kbuf, func); + else + return walk_system_ram_res(0, ULONG_MAX, kbuf, func); +} + +int setup_dtb(struct kimage *image, + unsigned long initrd_load_addr, unsigned long initrd_len, + char *cmdline, unsigned long cmdline_len, + char **dtb_buf, size_t *dtb_buf_len) +{ + char *buf = NULL; + size_t buf_size; + int nodeoffset; + u64 value; + int range_len; + int ret; + + /* duplicate dt blob */ + buf_size = fdt_totalsize(initial_boot_params); + range_len = (__dt_root_addr_cells + __dt_root_size_cells) * sizeof(u32); + + if (initrd_load_addr) + buf_size += fdt_prop_len("initrd-start", sizeof(u64)) + + fdt_prop_len("initrd-end", sizeof(u64)); + + if (cmdline) + buf_size += fdt_prop_len("bootargs", cmdline_len + 1); + + buf = vmalloc(buf_size); + if (!buf) { + ret = -ENOMEM; + goto out_err; + } + + ret = fdt_open_into(initial_boot_params, buf, buf_size); + if (ret) + goto out_err; + + nodeoffset = fdt_path_offset(buf, "/chosen"); + if (nodeoffset < 0) + goto out_err; + + /* add bootargs */ + if (cmdline) { + ret = fdt_setprop(buf, nodeoffset, "bootargs", + cmdline, cmdline_len + 1); + if (ret) + goto out_err; + } + + /* add initrd-* */ + if (initrd_load_addr) { + value = cpu_to_fdt64(initrd_load_addr); + ret = fdt_setprop(buf, nodeoffset, "initrd-start", + &value, sizeof(value)); + if (ret) + goto out_err; + + value = cpu_to_fdt64(initrd_load_addr + initrd_len); + ret = fdt_setprop(buf, nodeoffset, "initrd-end", + &value, sizeof(value)); + if (ret) + goto out_err; + } + + /* trim a buffer */ + fdt_pack(buf); + *dtb_buf = buf; + *dtb_buf_len = fdt_totalsize(buf); + + return 0; + +out_err: + vfree(buf); + return ret; +} + +int load_other_segments(struct kimage *image, unsigned long kernel_load_addr, + char *initrd, unsigned long initrd_len, + char *cmdline, unsigned long cmdline_len) +{ + struct kexec_buf kbuf; + unsigned long initrd_load_addr = 0; + unsigned long purgatory_load_addr, dtb_load_addr; + char *dtb = NULL; + unsigned long dtb_len; + int ret = 0; + + kbuf.image = image; + + /* Load initrd */ + if (initrd) { + kbuf.buffer = initrd; + kbuf.bufsz = initrd_len; + kbuf.memsz = initrd_len; + kbuf.buf_align = PAGE_SIZE; + /* within 1GB-aligned window of up to 32GB in size */ + kbuf.buf_min = kernel_load_addr; + kbuf.buf_max = round_down(kernel_load_addr, SZ_1G) + + (unsigned long)SZ_1G * 31; + kbuf.top_down = 0; + + ret = kexec_add_buffer(&kbuf); + if (ret) + goto out_err; + initrd_load_addr = kbuf.mem; + + pr_debug("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n", + initrd_load_addr, initrd_len, initrd_len); + } + + /* Load dtb blob */ + ret = setup_dtb(image, initrd_load_addr, initrd_len, + cmdline, cmdline_len, &dtb, &dtb_len); + if (ret) { + pr_err("Preparing for new dtb failed\n"); + goto out_err; + } + + kbuf.buffer = dtb; + kbuf.bufsz = dtb_len; + kbuf.memsz = dtb_len; + /* not across 2MB boundary */ + kbuf.buf_align = SZ_2M; + /* + * Note for backporting: + * On kernel prior to v4.2, fdt must reside within 512MB block + * where the kernel also resides. So + * kbuf.buf_min = round_down(kernel_load_addr, SZ_512M); + * kbuf.buf_max = round_up(kernel_load_addr, SZ_512M); + * would be required. + */ + kbuf.buf_min = kernel_load_addr; + kbuf.buf_max = ULONG_MAX; + kbuf.top_down = 1; + + ret = kexec_add_buffer(&kbuf); + if (ret) + goto out_err; + dtb_load_addr = kbuf.mem; + image->arch.dtb_buf = dtb; + + pr_debug("Loaded dtb at 0x%lx bufsz=0x%lx memsz=0x%lx\n", + dtb_load_addr, dtb_len, dtb_len); + + /* Load purgatory */ + ret = kexec_load_purgatory(image, kernel_load_addr, ULONG_MAX, 1, + &purgatory_load_addr); + if (ret) { + pr_err("Loading purgatory failed\n"); + goto out_err; + } + + ret = kexec_purgatory_get_set_symbol(image, "arm64_kernel_entry", + &kernel_load_addr, sizeof(kernel_load_addr), 0); + if (ret) { + pr_err("Relocating symbol (arm64_kernel_entry) failed.\n"); + goto out_err; + } + + ret = kexec_purgatory_get_set_symbol(image, "arm64_dtb_addr", + &dtb_load_addr, sizeof(dtb_load_addr), 0); + if (ret) { + pr_err("Relocating symbol (arm64_dtb_addr) failed.\n"); + goto out_err; + } + + pr_debug("Loaded purgatory at 0x%lx\n", purgatory_load_addr); + + return 0; + +out_err: + vfree(dtb); + image->arch.dtb_buf = NULL; + return ret; +} -- 2.14.1