mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-09 11:00:49 +01:00
Borislav Petkov
21d9bb4a05
The SME encryption mask is for masking 64-bit pagetable entries. It
being an unsigned long works fine on X86_64 but on 32-bit builds in
truncates bits leading to Xen guests crashing very early.
And regardless, the whole SME mask handling shouldnt've leaked into
32-bit because SME is X86_64-only feature. So, first make the mask u64.
And then, add trivial 32-bit versions of the __sme_* macros so that
nothing happens there.
Reported-and-tested-by: Boris Ostrovsky <[email protected]>
Tested-by: Brijesh Singh <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Acked-by: Tom Lendacky <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas <[email protected]>
Fixes: 21729f81ce ("x86/mm: Provide general kernel support for memory encryption")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
/*
|
|
* AMD Memory Encryption Support
|
|
*
|
|
* Copyright (C) 2016 Advanced Micro Devices, Inc.
|
|
*
|
|
* Author: Tom Lendacky <[email protected]>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#ifndef __MEM_ENCRYPT_H__
|
|
#define __MEM_ENCRYPT_H__
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT
|
|
|
|
#include <asm/mem_encrypt.h>
|
|
|
|
#else /* !CONFIG_ARCH_HAS_MEM_ENCRYPT */
|
|
|
|
#define sme_me_mask 0ULL
|
|
|
|
#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
|
|
|
|
static inline bool sme_active(void)
|
|
{
|
|
return !!sme_me_mask;
|
|
}
|
|
|
|
static inline u64 sme_get_me_mask(void)
|
|
{
|
|
return sme_me_mask;
|
|
}
|
|
|
|
#ifdef CONFIG_AMD_MEM_ENCRYPT
|
|
/*
|
|
* The __sme_set() and __sme_clr() macros are useful for adding or removing
|
|
* the encryption mask from a value (e.g. when dealing with pagetable
|
|
* entries).
|
|
*/
|
|
#define __sme_set(x) ((x) | sme_me_mask)
|
|
#define __sme_clr(x) ((x) & ~sme_me_mask)
|
|
#else
|
|
#define __sme_set(x) (x)
|
|
#define __sme_clr(x) (x)
|
|
#endif
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#endif /* __MEM_ENCRYPT_H__ */
|