x86/virt, x86/acpi: Add test for ACPI_FADT_NO_VGA
Add a test for ACPI_FADT_NO_VGA when scanning the FADT and set the new
flag x86_platform.legacy.no_vga accordingly.
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: len.brown@intel.com
Cc: linux-pm@vger.kernel.org
Cc: pavel@ucw.cz
Cc: rjw@rjwysocki.net
Link: http://lkml.kernel.org/r/20171109132739.23465-4-jgross@suse.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index ad15a0f..260e9a8 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -208,6 +208,7 @@ enum x86_legacy_i8042_state {
struct x86_legacy_features {
enum x86_legacy_i8042_state i8042;
int rtc;
+ int no_vga;
int reserve_bios_regions;
struct x86_legacy_devices devices;
};
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 079535e53..ef9e02e 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -961,6 +961,11 @@ static int __init acpi_parse_fadt(struct acpi_table_header *table)
x86_platform.legacy.rtc = 0;
}
+ if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_VGA) {
+ pr_debug("ACPI: probing for VGA not safe\n");
+ x86_platform.legacy.no_vga = 1;
+ }
+
#ifdef CONFIG_X86_PM_TIMER
/* detect the location of the ACPI PM Timer */
if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {