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Dan Williams
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: <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Tony Luck <[email protected]> Cc: Al Viro <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Linus Torvalds <[email protected]> Reported-by: Tony Luck <[email protected]> Signed-off-by: Dan Williams <[email protected]>