/* * Copyright (C) 2015, Wang Nan * Copyright (C) 2015, Huawei Inc. */ #ifndef __LLVM_UTILS_H #define __LLVM_UTILS_H #include "debug.h" struct llvm_param { /* Path of clang executable */ const char *clang_path; /* * Template of clang bpf compiling. 5 env variables * can be used: * $CLANG_EXEC: Path to clang. * $CLANG_OPTIONS: Extra options to clang. * $KERNEL_INC_OPTIONS: Kernel include directories. * $WORKING_DIR: Kernel source directory. * $CLANG_SOURCE: Source file to be compiled. */ const char *clang_bpf_cmd_template; /* Will be filled in $CLANG_OPTIONS */ const char *clang_opt; /* Where to find kbuild system */ const char *kbuild_dir; /* * Arguments passed to make, like 'ARCH=arm' if doing cross * compiling. Should not be used for dynamic compiling. */ const char *kbuild_opts; /* * Default is false. If set to true, write compiling result * to object file. */ bool dump_obj; /* * Default is false. If one of the above fields is set by user * explicitly then user_set_llvm is set to true. This is used * for perf test. If user doesn't set anything in .perfconfig * and clang is not found, don't trigger llvm test. */ bool user_set_param; }; extern struct llvm_param llvm_param; int perf_llvm_config(const char *var, const char *value); int llvm__compile_bpf(const char *path, void **p_obj_buf, size_t *p_obj_buf_sz); /* This function is for test__llvm() use only */ int llvm__search_clang(void); /* Following functions are reused by builtin clang support */ void llvm__get_kbuild_opts(char **kbuild_dir, char **kbuild_include_opts); int llvm__get_nr_cpus(void); void llvm__dump_obj(const char *path, void *obj_buf, size_t size); #endif remove&id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>refslogtreecommitdiff
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authorJiri Kosina <jkosina@suse.cz>2017-01-27 22:25:52 +0000
committerIngo Molnar <mingo@kernel.org>2017-01-28 09:18:56 +0100
commitbf29bddf0417a4783da3b24e8c9e017ac649326f (patch)
tree54a05a4883b73f80e4e1d8c4b15750aa01c39932 /tools/perf/Documentation/perf-diff.txt
parent883af14e67e8b8702b5560aa64c888c0cd0bd66c (diff)
x86/efi: Always map the first physical page into the EFI pagetables
Commit: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode") stopped creating 1:1 mappings for all RAM, when running in native 64-bit mode. It turns out though that there are 64-bit EFI implementations in the wild (this particular problem has been reported on a Lenovo Yoga 710-11IKB), which still make use of the first physical page for their own private use, even though they explicitly mark it EFI_CONVENTIONAL_MEMORY in the memory map. In case there is no mapping for this particular frame in the EFI pagetables, as soon as firmware tries to make use of it, a triple fault occurs and the system reboots (in case of the Yoga 710-11IKB this is very early during bootup). Fix that by always mapping the first page of physical memory into the EFI pagetables. We're free to hand this page to the BIOS, as trim_bios_range() will reserve the first page and isolate it away from memory allocators anyway. Note that just reverting 129766708 alone is not enough on v4.9-rc1+ to fix the regression on affected hardware, as this commit: ab72a27da ("x86/efi: Consolidate region mapping logic") later made the first physical frame not to be mapped anyway. Reported-by: Hanka Pavlikova <hanka@ucw.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Laura Abbott <labbott@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vojtech Pavlik <vojtech@ucw.cz> Cc: Waiman Long <waiman.long@hpe.com> Cc: linux-efi@vger.kernel.org Cc: stable@kernel.org # v4.8+ Fixes: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode") Link: http://lkml.kernel.org/r/20170127222552.22336-1-matt@codeblueprint.co.uk [ Tidied up the changelog and the comment. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
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