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The immovable memory ranges information in the SRAT table is necessary to fix the issue of KASLR not paying attention to movable memory regions when selecting the offset. Therefore, SRAT needs to be parsed. Depending on the boot: KEXEC/EFI/BIOS, the methods to compute RSDP are different. When booting from EFI, the EFI table points to the RSDP. So iterate over the EFI system tables in order to find the RSDP. [ bp: - Heavily massage commit message - Trim comments - Move the CONFIG_ACPI ifdeffery into the Makefile. ] Signed-off-by: Chao Fan <fanc.fnst@cn.fujitsu.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: bhe@redhat.com Cc: caoj.fnst@cn.fujitsu.com Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: indou.takao@jp.fujitsu.com Cc: Ingo Molnar <mingo@redhat.com> Cc: kasong@redhat.com Cc: Kees Cook <keescook@chromium.org> Cc: msys.mizuma@gmail.com Cc: Thomas Gleixner <tglx@linutronix.de> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20190123110850.12433-4-fanc.fnst@cn.fujitsu.com |
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