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x86/sme: Use #define USE_EARLY_PGTABLE_L5 in mem_encrypt_identity.c

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commit e7d445ab26db833d6640d4c9a08bee176777cc82 upstream.

When runtime support for converting between 4-level and 5-level pagetables
was added to the kernel, the SME code that built pagetables was updated
to use the pagetable functions, e.g. p4d_offset(), etc., in order to
simplify the code. However, the use of the pagetable functions in early
boot code requires the use of the USE_EARLY_PGTABLE_L5 #define in order to
ensure that the proper definition of pgtable_l5_enabled() is used.

Without the #define, pgtable_l5_enabled() is #defined as
cpu_feature_enabled(X86_FEATURE_LA57). In early boot, the CPU features
have not yet been discovered and populated, so pgtable_l5_enabled() will
return false even when 5-level paging is enabled. This causes the SME code
to always build 4-level pagetables to perform the in-place encryption.
If 5-level paging is enabled, switching to the SME pagetables results in
a page-fault that kills the boot.

Adding the #define results in pgtable_l5_enabled() using the
__pgtable_l5_enabled variable set in early boot and the SME code building
pagetables for the proper paging level.

Fixes: aad983913d77 ("x86/mm/encrypt: Simplify sme_populate_pgd() and sme_populate_pgd_large()")
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: <stable@vger.kernel.org> # 4.18.x
Link: https://lkml.kernel.org/r/2cb8329655f5c753905812d951e212022a480475.1634318656.git.thomas.lendacky@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tom Lendacky 2021-10-15 12:24:16 -05:00 committed by Greg Kroah-Hartman
parent ccc4e5e60b
commit e3d4ba338b
1 changed files with 9 additions and 0 deletions
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9
arch/x86/mm/mem_encrypt_identity.c
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@ -27,6 +27,15 @@
#undef CONFIG_PARAVIRT_XXL
#undef CONFIG_PARAVIRT_SPINLOCKS
/*
* This code runs before CPU feature bits are set. By default, the
* pgtable_l5_enabled() function uses bit X86_FEATURE_LA57 to determine if
* 5-level paging is active, so that won't work here. USE_EARLY_PGTABLE_L5
* is provided to handle this situation and, instead, use a variable that
* has been set by the early boot code.
*/
#define USE_EARLY_PGTABLE_L5
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/mem_encrypt.h>