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>
master commit: 654c917d94d24587bb6b4a8d862baf04b25cbe33
master date: 2021-01-11 14:55:52 +0100

diff --git a/xen/arch/x86/acpi/boot.c b/xen/arch/x86/acpi/boot.c
index ed40ce56b4efa5688761fdcfd2f69c9414509639..38c2b76e00e1bb55b353d61a6bf6c084b9bae3ae 100644 (file)
--- a/xen/arch/x86/acpi/boot.c
+++ b/xen/arch/x86/acpi/boot.c
@@ -349,7 +349,7 @@ static int __init acpi_invalidate_bgrt(struct acpi_table_header *table)
 
 /* 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;
@@ -362,10 +362,10 @@ acpi_fadt_parse_sleep_info(struct acpi_table_fadt *fadt)
                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 ||
@@ -384,8 +384,8 @@ acpi_fadt_parse_sleep_info(struct acpi_table_fadt *fadt)
                               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;
                }
        }