From 3a63f70bf4c3a17f5d9c9bf3bc3288a23bdfefce Mon Sep 17 00:00:00 2001 From: Chao Fan Date: Wed, 23 Jan 2019 19:08:48 +0800 Subject: x86/boot: Early parse RSDP and save it in boot_params The RSDP is needed by KASLR so parse it early and save it in boot_params.acpi_rsdp_addr, before KASLR setup runs. RSDP is needed by other kernel facilities so have the parsing code built-in instead of a long "depends on" line in Kconfig. [ bp: - Trim commit message and comments - Add CONFIG_ACPI dependency in the Makefile - Move ->acpi_rsdp_addr assignment with the rest of boot_params massaging in extract_kernel(). ] Signed-off-by: Chao Fan Signed-off-by: Borislav Petkov Cc: bhe@redhat.com Cc: Cao jin Cc: "H. Peter Anvin" Cc: indou.takao@jp.fujitsu.com Cc: Ingo Molnar Cc: Juergen Gross Cc: kasong@redhat.com Cc: Kees Cook Cc: "Kirill A. Shutemov" Cc: Masahiro Yamada Cc: msys.mizuma@gmail.com Cc: Thomas Gleixner Cc: Tom Lendacky Cc: x86-ml Link: https://lkml.kernel.org/r/20190123110850.12433-6-fanc.fnst@cn.fujitsu.com --- arch/x86/boot/compressed/misc.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/x86/boot/compressed/misc.c') diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c index 8dd1d5ccae58..c0d6c560df69 100644 --- a/arch/x86/boot/compressed/misc.c +++ b/arch/x86/boot/compressed/misc.c @@ -351,6 +351,9 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, /* Clear flags intended for solely in-kernel use. */ boot_params->hdr.loadflags &= ~KASLR_FLAG; + /* Save RSDP address for later use. */ + boot_params->acpi_rsdp_addr = get_rsdp_addr(); + sanitize_boot_params(boot_params); if (boot_params->screen_info.orig_video_mode == 7) { -- cgit