diff options
| author | Raphael Gault <raphael.gault@arm.com> | 2021-05-17 13:02:56 -0500 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-06-22 11:57:03 +0100 |
| commit | cf292e93f423fdebdf751a22ea01249196806328 (patch) | |
| tree | eabf1a5357f0be769180bebc31c0c5cf7ae7c1ff /arch/arm64 | |
| parent | 873c3e89777c8c56f936ae7aceca1a102aac6b9e (diff) | |
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>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 52389018ff33..dbae006f625f 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -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, |