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init, x86: Move mem_encrypt_init() into arch_cpu_finalize_init()

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commit 439e17576e 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@linutronix.de>
Link: https://lore.kernel.org/r/20230613224545.670360645@linutronix.de
Signed-off-by: Daniel Sneddon <daniel.sneddon@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Gleixner 2023-06-14 01:39:41 +02:00 committed by Greg Kroah-Hartman
parent b90a399294
commit ef54e26b2e
3 changed files with 13 additions and 10 deletions
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2
arch/x86/include/asm/mem_encrypt.h
View File

@ -64,6 +64,8 @@ static inline void __init sme_early_init(void) { }
static inline void __init sme_encrypt_kernel(struct boot_params *bp) { }
static inline void __init sme_enable(struct boot_params *bp) { }
static inline void mem_encrypt_init(void) { }
#endif /* CONFIG_AMD_MEM_ENCRYPT */
/*

11
arch/x86/kernel/cpu/common.c
View File

@ -14,6 +14,7 @@
#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>
@ -2049,4 +2050,14 @@ 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();
}

10
init/main.c
View File

@ -485,8 +485,6 @@ void __init __weak thread_stack_cache_init(void)
}
#endif
void __init __weak mem_encrypt_init(void) { }
/*
* Set up kernel memory allocators
*/
@ -648,14 +646,6 @@ asmlinkage __visible void __init start_kernel(void)
*/
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) {