[PATCH V2 1/3] x86/efi: Call efi_delete_dummy_variable() during efi subsystem initialization

[Sai Praneeth Prakhya]

From: Sai Praneeth <sai.praneeth.prakhya@xxxxxxxxx>

Invoking efi_runtime_services() through efi_workqueue means all accesses
to efi_runtime_services() should be done after efi_rts_wq has been
created. efi_delete_dummy_variable() calls set_variable(), hence
efi_delete_dummy_variable() should be called after efi_rts_wq has been
created.

efi_delete_dummy_variable() is called from efi_enter_virtual_mode()
which is early in the boot phase (efi_rts_wq isn't created yet), so call
efi_delete_dummy_variable() later in the boot phase i.e. while
initializing efi subsystem. In the next patch, this is the place where
we create efi_rts_wq and all the efi_runtime_services() will be called
using efi_rts_wq.

Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@xxxxxxxxx>
Suggested-by: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Lee, Chun-Yi <jlee@xxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Bhupesh Sharma <bhsharma@xxxxxxxxxx>
Cc: Ricardo Neri <ricardo.neri@xxxxxxxxx>
Cc: Ravi Shankar <ravi.v.shankar@xxxxxxxxx>
Cc: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peter.zijlstra@xxxxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
---
 arch/x86/include/asm/efi.h  | 1 -
 arch/x86/platform/efi/efi.c | 6 ------
 drivers/firmware/efi/efi.c  | 6 ++++++
 include/linux/efi.h         | 3 +++
 4 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index a399c1ebf6f0..43009e3f821b 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -143,7 +143,6 @@ extern void __init efi_runtime_update_mappings(void);
 extern void __init efi_dump_pagetable(void);
 extern void __init efi_apply_memmap_quirks(void);
 extern int __init efi_reuse_config(u64 tables, int nr_tables);
-extern void efi_delete_dummy_variable(void);
 
 struct efi_setup_data {
 	u64 fw_vendor;
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 9061babfbc83..a3169d14583f 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -893,9 +893,6 @@ static void __init kexec_enter_virtual_mode(void)
 
 	if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX))
 		runtime_code_page_mkexec();
-
-	/* clean DUMMY object */
-	efi_delete_dummy_variable();
 #endif
 }
 
@@ -1015,9 +1012,6 @@ static void __init __efi_enter_virtual_mode(void)
 	 * necessary relocation fixups for the new virtual addresses.
 	 */
 	efi_runtime_update_mappings();
-
-	/* clean DUMMY object */
-	efi_delete_dummy_variable();
 }
 
 void __init efi_enter_virtual_mode(void)
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index cd42f66a7c85..838b8efe639c 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -328,6 +328,12 @@ static int __init efisubsys_init(void)
 	if (!efi_enabled(EFI_BOOT))
 		return 0;
 
+	/*
+	 * Clean DUMMY object calls EFI Runtime Service, set_variable(), so
+	 * it should be invoked only after efi_rts_workqueue is ready.
+	 */
+	efi_delete_dummy_variable();
+
 	/* We register the efi directory at /sys/firmware/efi */
 	efi_kobj = kobject_create_and_add("efi", firmware_kobj);
 	if (!efi_kobj) {
diff --git a/include/linux/efi.h b/include/linux/efi.h
index f5083aa72eae..c4efb3ef0dfa 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -992,6 +992,7 @@ extern efi_status_t efi_query_variable_store(u32 attributes,
 					     unsigned long size,
 					     bool nonblocking);
 extern void efi_find_mirror(void);
+extern void efi_delete_dummy_variable(void);
 #else
 static inline void efi_late_init(void) {}
 static inline void efi_free_boot_services(void) {}
@@ -1002,6 +1003,8 @@ static inline efi_status_t efi_query_variable_store(u32 attributes,
 {
 	return EFI_SUCCESS;
 }
+
+static inline void efi_delete_dummy_variable(void) {}
 #endif
 extern void __iomem *efi_lookup_mapped_addr(u64 phys_addr);
 
-- 
2.7.4