Commit 3a63f70b authored by Chao Fan's avatar Chao Fan Committed by Borislav Petkov

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: default avatarChao Fan <fanc.fnst@cn.fujitsu.com>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Cc: bhe@redhat.com
Cc: Cao jin <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: Juergen Gross <jgross@suse.com>
Cc: kasong@redhat.com
Cc: Kees Cook <keescook@chromium.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: msys.mizuma@gmail.com
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190123110850.12433-6-fanc.fnst@cn.fujitsu.com
parent 93a209aa
...@@ -84,6 +84,8 @@ ifdef CONFIG_X86_64 ...@@ -84,6 +84,8 @@ ifdef CONFIG_X86_64
vmlinux-objs-y += $(obj)/pgtable_64.o vmlinux-objs-y += $(obj)/pgtable_64.o
endif endif
vmlinux-objs-$(CONFIG_ACPI) += $(obj)/acpi.o
$(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone $(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone
vmlinux-objs-$(CONFIG_EFI_STUB) += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o \ vmlinux-objs-$(CONFIG_EFI_STUB) += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o \
......
...@@ -184,3 +184,22 @@ static acpi_physical_address bios_get_rsdp_addr(void) ...@@ -184,3 +184,22 @@ static acpi_physical_address bios_get_rsdp_addr(void)
return 0; return 0;
} }
/* Return RSDP address on success, otherwise 0. */
acpi_physical_address get_rsdp_addr(void)
{
acpi_physical_address pa;
pa = get_acpi_rsdp();
if (!pa)
pa = boot_params->acpi_rsdp_addr;
if (!pa)
pa = efi_get_rsdp_addr();
if (!pa)
pa = bios_get_rsdp_addr();
return pa;
}
...@@ -351,6 +351,9 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, ...@@ -351,6 +351,9 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
/* Clear flags intended for solely in-kernel use. */ /* Clear flags intended for solely in-kernel use. */
boot_params->hdr.loadflags &= ~KASLR_FLAG; 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); sanitize_boot_params(boot_params);
if (boot_params->screen_info.orig_video_mode == 7) { if (boot_params->screen_info.orig_video_mode == 7) {
......
...@@ -119,3 +119,10 @@ static inline void console_init(void) ...@@ -119,3 +119,10 @@ static inline void console_init(void)
void set_sev_encryption_mask(void); void set_sev_encryption_mask(void);
#endif #endif
/* acpi.c */
#ifdef CONFIG_ACPI
acpi_physical_address get_rsdp_addr(void);
#else
static inline acpi_physical_address get_rsdp_addr(void) { return 0; }
#endif
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