This is a note to let you know that I've just added the patch titled
init, x86: Move mem_encrypt_init() into arch_cpu_finalize_init()
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
init-x86-move-mem_encrypt_init-into-arch_cpu_finalize_init.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 555b9962472818fba44eb42f31cfd1e118d20478 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Date: Wed, 14 Jun 2023 01:39:41 +0200
Subject: init, x86: Move mem_encrypt_init() into arch_cpu_finalize_init()
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
commit 439e17576eb47f26b78c5bbc72e344d4206d2327 upstream
Invoke the X86ism mem_encrypt_init() from X86 arch_cpu_finalize_init() and
remove the weak fallback from the core code.
No functional change.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230613224545.670360645@xxxxxxxxxxxxx
Signed-off-by: Daniel Sneddon <daniel.sneddon@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/mem_encrypt.h | 2 ++
arch/x86/kernel/cpu/common.c | 11 +++++++++++
init/main.c | 11 -----------
3 files changed, 13 insertions(+), 11 deletions(-)
--- a/arch/x86/include/asm/mem_encrypt.h
+++ b/arch/x86/include/asm/mem_encrypt.h
@@ -77,6 +77,8 @@ early_set_memory_decrypted(unsigned long
static inline int __init
early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; }
+static inline void mem_encrypt_init(void) { }
+
#define __bss_decrypted
#endif /* CONFIG_AMD_MEM_ENCRYPT */
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -17,6 +17,7 @@
#include <linux/init.h>
#include <linux/kprobes.h>
#include <linux/kgdb.h>
+#include <linux/mem_encrypt.h>
#include <linux/smp.h>
#include <linux/cpu.h>
#include <linux/io.h>
@@ -2209,4 +2210,14 @@ void __init arch_cpu_finalize_init(void)
} else {
fpu__init_check_bugs();
}
+
+ /*
+ * This needs to be called before any devices perform DMA
+ * operations that might use the SWIOTLB bounce buffers. It will
+ * mark the bounce buffers as decrypted so that their usage will
+ * not cause "plain-text" data to be decrypted when accessed. It
+ * must be called after late_time_init() so that Hyper-V x86/x64
+ * hypercalls work when the SWIOTLB bounce buffers are decrypted.
+ */
+ mem_encrypt_init();
}
--- a/init/main.c
+++ b/init/main.c
@@ -93,7 +93,6 @@
#include <linux/cache.h>
#include <linux/rodata_test.h>
#include <linux/jump_label.h>
-#include <linux/mem_encrypt.h>
#include <asm/io.h>
#include <asm/setup.h>
@@ -503,8 +502,6 @@ void __init __weak thread_stack_cache_in
}
#endif
-void __init __weak mem_encrypt_init(void) { }
-
void __init __weak poking_init(void) { }
void __init __weak pgtable_cache_init(void) { }
@@ -720,14 +717,6 @@ asmlinkage __visible void __init start_k
*/
locking_selftest();
- /*
- * This needs to be called before any devices perform DMA
- * operations that might use the SWIOTLB bounce buffers. It will
- * mark the bounce buffers as decrypted so that their usage will
- * not cause "plain-text" data to be decrypted when accessed.
- */
- mem_encrypt_init();
-
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start && !initrd_below_start_ok &&
page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
Patches currently in stable-queue which might be from tglx@xxxxxxxxxxxxx are
queue-5.4/x86-cpu-switch-to-arch_cpu_finalize_init.patch
queue-5.4/arm-cpu-switch-to-arch_cpu_finalize_init.patch
queue-5.4/um-cpu-switch-to-arch_cpu_finalize_init.patch
queue-5.4/mips-cpu-switch-to-arch_cpu_finalize_init.patch
queue-5.4/init-x86-move-mem_encrypt_init-into-arch_cpu_finalize_init.patch
queue-5.4/sh-cpu-switch-to-arch_cpu_finalize_init.patch
queue-5.4/init-invoke-arch_cpu_finalize_init-earlier.patch
queue-5.4/x86-xen-fix-secondary-processors-fpu-initialization.patch
queue-5.4/x86-fpu-move-fpu-initialization-into-arch_cpu_finalize_init.patch
queue-5.4/init-remove-check_bugs-leftovers.patch
queue-5.4/init-provide-arch_cpu_finalize_init.patch
queue-5.4/m68k-cpu-switch-to-arch_cpu_finalize_init.patch
queue-5.4/sparc-cpu-switch-to-arch_cpu_finalize_init.patch
queue-5.4/x86-fpu-mark-init-functions-__init.patch
queue-5.4/ia64-cpu-switch-to-arch_cpu_finalize_init.patch
queue-5.4/x86-fpu-remove-cpuinfo-argument-from-init-functions.patch
