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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5d8beee20d
Given the fact that the ACPI "EINJ" (error injection) facility is not universally available, implement software infrastructure to validate the memcpy_mcsafe() exception handling implementation. For each potential read exception point in memcpy_mcsafe(), inject a emulated exception point at the address identified by 'mcsafe_inject' variable. With this infrastructure implement a test to validate that the 'bytes remaining' calculation is correct for a range of various source buffer alignments. This code is compiled out by default. The CONFIG_MCSAFE_DEBUG configuration symbol needs to be manually enabled by editing Kconfig.debug. I.e. this functionality can not be accidentally enabled by a user / distro, it's only for development. Cc: <x86@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Reported-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
76 lines
1.4 KiB
C
76 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _MCSAFE_TEST_H_
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#define _MCSAFE_TEST_H_
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_MCSAFE_TEST
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extern unsigned long mcsafe_test_src;
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extern unsigned long mcsafe_test_dst;
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static inline void mcsafe_inject_src(void *addr)
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{
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if (addr)
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mcsafe_test_src = (unsigned long) addr;
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else
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mcsafe_test_src = ~0UL;
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}
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static inline void mcsafe_inject_dst(void *addr)
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{
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if (addr)
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mcsafe_test_dst = (unsigned long) addr;
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else
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mcsafe_test_dst = ~0UL;
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}
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#else /* CONFIG_MCSAFE_TEST */
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static inline void mcsafe_inject_src(void *addr)
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{
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}
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static inline void mcsafe_inject_dst(void *addr)
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{
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}
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#endif /* CONFIG_MCSAFE_TEST */
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#else /* __ASSEMBLY__ */
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#include <asm/export.h>
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#ifdef CONFIG_MCSAFE_TEST
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.macro MCSAFE_TEST_CTL
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.pushsection .data
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.align 8
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.globl mcsafe_test_src
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mcsafe_test_src:
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.quad 0
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EXPORT_SYMBOL_GPL(mcsafe_test_src)
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.globl mcsafe_test_dst
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mcsafe_test_dst:
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.quad 0
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EXPORT_SYMBOL_GPL(mcsafe_test_dst)
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.popsection
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.endm
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.macro MCSAFE_TEST_SRC reg count target
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leaq \count(\reg), %r9
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cmp mcsafe_test_src, %r9
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ja \target
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.endm
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.macro MCSAFE_TEST_DST reg count target
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leaq \count(\reg), %r9
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cmp mcsafe_test_dst, %r9
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ja \target
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.endm
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#else
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.macro MCSAFE_TEST_CTL
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.endm
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.macro MCSAFE_TEST_SRC reg count target
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.endm
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.macro MCSAFE_TEST_DST reg count target
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.endm
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#endif /* CONFIG_MCSAFE_TEST */
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#endif /* __ASSEMBLY__ */
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#endif /* _MCSAFE_TEST_H_ */
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