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    Subject[PATCH AUTOSEL 5.4 278/330] arm64/cpufeature: Drop TraceFilt feature exposure from ID_DFR0 register
    Date
    From: Anshuman Khandual <anshuman.khandual@arm.com>

    [ Upstream commit 1ed1b90a0594c8c9d31e8bb8be25a2b37717dc9e ]

    ID_DFR0 based TraceFilt feature should not be exposed to guests. Hence lets
    drop it.

    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Cc: Will Deacon <will@kernel.org>
    Cc: Marc Zyngier <maz@kernel.org>
    Cc: Mark Rutland <mark.rutland@arm.com>
    Cc: James Morse <james.morse@arm.com>
    Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
    Cc: linux-arm-kernel@lists.infradead.org
    Cc: linux-kernel@vger.kernel.org

    Suggested-by: Mark Rutland <mark.rutland@arm.com>
    Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
    Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
    Link: https://lore.kernel.org/r/1589881254-10082-3-git-send-email-anshuman.khandual@arm.com
    Signed-off-by: Will Deacon <will@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/arm64/kernel/cpufeature.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
    index 1df57ffc9314d..f2ec845404149 100644
    --- a/arch/arm64/kernel/cpufeature.c
    +++ b/arch/arm64/kernel/cpufeature.c
    @@ -319,7 +319,7 @@ static const struct arm64_ftr_bits ftr_id_pfr0[] = {
    };

    static const struct arm64_ftr_bits ftr_id_dfr0[] = {
    - ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0),
    + /* [31:28] TraceFilt */
    S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0xf), /* PerfMon */
    ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0),
    ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0),
    --
    2.25.1
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