powerpc/dexcr: Handle hashchk exception

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Recognise and pass the appropriate signal to the user program when a
hashchk instruction triggers. This is independent of allowing
configuration of DEXCR[NPHIE], as a hypervisor can enforce this aspect
regardless of the kernel.

The signal mirrors how ARM reports their similar check failure. For
example, their FPAC handler in arch/arm64/kernel/traps.c do_el0_fpac()
does this. When we fail to read the instruction that caused the fault
we send a segfault, similar to how emulate_math() does it.

Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230616034846.311705-5-bgray@linux.ibm.com

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Benjamin Gray 2023-06-19 17:36:25 +10:00 • committed by Michael Ellerman

parent 0ffd60b782

commit 5bcba4e6c1

2 changed files with 17 additions and 0 deletions

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1

arch/powerpc/include/asm/ppc-opcode.h

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16

arch/powerpc/kernel/traps.c

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