[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v7 08/12] xen: add /buildinfo/config entry to hypervisor filesystem
Add the /buildinfo/config entry to the hypervisor filesystem. This entry contains the .config file used to build the hypervisor. Signed-off-by: Juergen Gross <jgross@xxxxxxxx> --- V3: - store data in gzip format - use binfile mechanism to create data file - move code to kernel.c V6: - add config item for the /buildinfo/config (Jan Beulich) - make config related variables const in kernel.h (Jan Beulich) V7: - update doc (Jan Beulich) - use "rm -f" in Makefile (Jan Beulich) --- .gitignore | 2 ++ docs/misc/hypfs-paths.pandoc | 4 ++++ xen/common/Kconfig | 10 ++++++++++ xen/common/Makefile | 12 ++++++++++++ xen/common/kernel.c | 15 +++++++++++++++ xen/include/xen/kernel.h | 3 +++ 6 files changed, 46 insertions(+) diff --git a/.gitignore b/.gitignore index fd5610718d..bc8e053ccb 100644 --- a/.gitignore +++ b/.gitignore @@ -297,6 +297,8 @@ xen/arch/*/efi/boot.c xen/arch/*/efi/compat.c xen/arch/*/efi/efi.h xen/arch/*/efi/runtime.c +xen/common/config_data.S +xen/common/config.gz xen/include/headers*.chk xen/include/asm xen/include/asm-*/asm-offsets.h diff --git a/docs/misc/hypfs-paths.pandoc b/docs/misc/hypfs-paths.pandoc index e392feff27..f134c505d6 100644 --- a/docs/misc/hypfs-paths.pandoc +++ b/docs/misc/hypfs-paths.pandoc @@ -133,6 +133,10 @@ Information about the compile domain. The compiler used to build Xen. +#### /buildinfo/config = STRING [CONFIG_HYPFS_CONFIG] + +The contents of the `xen/.config` file at the time of the hypervisor build. + #### /buildinfo/version/ A directory containing version information of the hypervisor. diff --git a/xen/common/Kconfig b/xen/common/Kconfig index a6914fcae9..c3303c8dfe 100644 --- a/xen/common/Kconfig +++ b/xen/common/Kconfig @@ -353,6 +353,16 @@ config DOM0_MEM Leave empty if you are not sure what to specify. +config HYPFS_CONFIG + bool "Provide hypervisor .config via hypfs entry" + default y + ---help--- + When enabled the contents of the .config file used to build the + hypervisor are provided via the hypfs entry /buildinfo/config. + + Disable this option in case you want to spare some memory or you + want to hide the .config contents from dom0. + config TRACEBUFFER bool "Enable tracing infrastructure" if EXPERT = "y" default y diff --git a/xen/common/Makefile b/xen/common/Makefile index 022e5f7ca3..3ae9f3420b 100644 --- a/xen/common/Makefile +++ b/xen/common/Makefile @@ -1,6 +1,7 @@ obj-$(CONFIG_ARGO) += argo.o obj-y += bitmap.o obj-y += bsearch.o +obj-$(CONFIG_HYPFS_CONFIG) += config_data.o obj-$(CONFIG_CORE_PARKING) += core_parking.o obj-y += cpu.o obj-$(CONFIG_DEBUG_TRACE) += debugtrace.o @@ -73,3 +74,14 @@ obj-$(CONFIG_UBSAN) += ubsan/ obj-$(CONFIG_NEEDS_LIBELF) += libelf/ obj-$(CONFIG_HAS_DEVICE_TREE) += libfdt/ + +config.gz: ../.config + gzip -c $< >$@ + +config_data.o: config.gz + +config_data.S: $(XEN_ROOT)/xen/tools/binfile + $(XEN_ROOT)/xen/tools/binfile $@ config.gz xen_config_data + +clean:: + rm -f config_data.S config.gz 2>/dev/null diff --git a/xen/common/kernel.c b/xen/common/kernel.c index da6e4b4444..4b7bc28afb 100644 --- a/xen/common/kernel.c +++ b/xen/common/kernel.c @@ -389,6 +389,16 @@ static HYPFS_STRING_INIT(compile_date, "compile_date"); static HYPFS_STRING_INIT(compile_domain, "compile_domain"); static HYPFS_STRING_INIT(extra, "extra"); +#ifdef CONFIG_HYPFS_CONFIG +static struct hypfs_entry_leaf config = { + .e.type = XEN_HYPFS_TYPE_STRING, + .e.encoding = XEN_HYPFS_ENC_GZIP, + .e.name = "config", + .e.read = hypfs_read_leaf, + .content = &xen_config_data +}; +#endif + static int __init buildinfo_init(void) { hypfs_add_dir(&hypfs_root, &buildinfo, true); @@ -414,6 +424,11 @@ static int __init buildinfo_init(void) hypfs_add_leaf(&version, &major, true); hypfs_add_leaf(&version, &minor, true); +#ifdef CONFIG_HYPFS_CONFIG + config.e.size = xen_config_data_size; + hypfs_add_leaf(&buildinfo, &config, true); +#endif + return 0; } __initcall(buildinfo_init); diff --git a/xen/include/xen/kernel.h b/xen/include/xen/kernel.h index 548b64da9f..02e3281f52 100644 --- a/xen/include/xen/kernel.h +++ b/xen/include/xen/kernel.h @@ -100,5 +100,8 @@ extern enum system_state { bool_t is_active_kernel_text(unsigned long addr); +extern const char xen_config_data; +extern const unsigned int xen_config_data_size; + #endif /* _LINUX_KERNEL_H */ -- 2.16.4
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