File 5ffc58e8-x86-ACPI-dont-overwrite-FADT.patch of Package xen.21118

Overview Repositories Revisions Requests Users Attributes Meta

File 5ffc58e8-x86-ACPI-dont-overwrite-FADT.patch of Package xen.21118

# Commit 654c917d94d24587bb6b4a8d862baf04b25cbe33
# Date 2021-01-11 14:55:52 +0100
# Author Jan Beulich <jbeulich@suse.com>
# Committer Jan Beulich <jbeulich@suse.com>
x86/ACPI: don't overwrite FADT

When marking fields invalid for our own purposes, we should do so in our
local copy (so we will notice later on), not in the firmware provided
one (which another entity may want to look at again, e.g. after kexec).
Also mark the function parameter const to notice such issues right away.

Instead use the pointer at the firmware copy for specifying an adjacent
printk()'s arguments. If nothing else this at least reduces the number
of relocations the assembler hasto emit and the linker has to process.

Fixes: 62d1a69a4e9f ("ACPI: support v5 (reduced HW) sleep interface")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

--- a/xen/arch/x86/acpi/boot.c
+++ b/xen/arch/x86/acpi/boot.c
@@ -348,7 +348,7 @@ static int __init acpi_invalidate_bgrt(s
 
 /* Get pm1x_cnt and pm1x_evt information for ACPI sleep */
 static void __init
-acpi_fadt_parse_sleep_info(struct acpi_table_fadt *fadt)
+acpi_fadt_parse_sleep_info(const struct acpi_table_fadt *fadt)
 {
 	struct acpi_table_facs *facs = NULL;
 	uint64_t facs_pa;
@@ -361,10 +361,10 @@ acpi_fadt_parse_sleep_info(struct acpi_t
 		printk(KERN_INFO PREFIX
 		       "v5 SLEEP INFO: control[%d:%"PRIx64"],"
 		       " status[%d:%"PRIx64"]\n",
-		       acpi_sinfo.sleep_control.space_id,
-		       acpi_sinfo.sleep_control.address,
-		       acpi_sinfo.sleep_status.space_id,
-		       acpi_sinfo.sleep_status.address);
+		       fadt->sleep_control.space_id,
+		       fadt->sleep_control.address,
+		       fadt->sleep_status.space_id,
+		       fadt->sleep_status.address);
 
 		if ((fadt->sleep_control.address &&
 		     (fadt->sleep_control.bit_offset ||
@@ -383,8 +383,8 @@ acpi_fadt_parse_sleep_info(struct acpi_t
 			       fadt->sleep_status.bit_offset,
 			       fadt->sleep_status.bit_width,
 			       fadt->sleep_status.access_width);
-			fadt->sleep_control.address = 0;
-			fadt->sleep_status.address = 0;
+			acpi_sinfo.sleep_control.address = 0;
+			acpi_sinfo.sleep_status.address = 0;
 		}
 	}

Places

File 5ffc58e8-x86-ACPI-dont-overwrite-FADT.patch of Package xen.21118

Places