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arm64: Restrict undef hook for cpufeature registers 

This commit modifies the mask of the mrs_hook declared in
arch/arm64/kernel/cpufeatures.c which emulates only feature register
access. This is necessary because this hook's mask was too large and
thus masking any mrs instruction, even if not related to the emulated
registers which made the pmu emulation inefficient.

Signed-off-by: Raphael Gault <raphael.gault@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210517180256.2881891-1-robh@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Raphael Gault 2021-05-17 13:02:56 -05:00 committed by Will Deacon
parent 873c3e8977
commit cf292e93f4
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/kernel/cpufeature.c
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@ -3018,8 +3018,8 @@ static int emulate_mrs(struct pt_regs *regs, u32 insn)
}
static struct undef_hook mrs_hook = {
.instr_mask = 0xfff00000,
.instr_val = 0xd5300000,
.instr_mask = 0xffff0000,
.instr_val = 0xd5380000,
.pstate_mask = PSR_AA32_MODE_MASK,
.pstate_val = PSR_MODE_EL0t,
.fn = emulate_mrs,