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    Subject[RFC 5/9] MCE: Mask out address mask bits below address granuality
    Date
    From: Andi Kleen <andi@firstfloor.org>

    SER enabled systems report the address granuality for each
    reported address in a machine check. But the bits below
    the granuality are undefined. Mask them out before
    logging the machine check.

    Signed-off-by: Andi Kleen <ak@linux.intel.com>
    Signed-off-by: Tony Luck <tony.luck@intel.com>
    ---
    arch/x86/kernel/cpu/mcheck/mce.c | 12 +++++++++++-
    1 files changed, 11 insertions(+), 1 deletions(-)

    diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
    index f4924dc..a9a0e25 100644
    --- a/arch/x86/kernel/cpu/mcheck/mce.c
    +++ b/arch/x86/kernel/cpu/mcheck/mce.c
    @@ -532,8 +532,18 @@ static void mce_read_aux(struct mce *m, int i)
    {
    if (m->status & MCI_STATUS_MISCV)
    m->misc = mce_rdmsrl(MSR_IA32_MCx_MISC(i));
    - if (m->status & MCI_STATUS_ADDRV)
    + if (m->status & MCI_STATUS_ADDRV) {
    m->addr = mce_rdmsrl(MSR_IA32_MCx_ADDR(i));
    +
    + /*
    + * Mask the reported address by the reported granuality.
    + */
    + if (mce_ser && (m->status & MCI_STATUS_MISCV)) {
    + u8 shift = m->misc & 0x1f;
    + m->addr >>= shift;
    + m->addr <<= shift;
    + }
    + }
    }

    DEFINE_PER_CPU(unsigned, mce_poll_count);
    --
    1.7.3.1


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