From: Mahesh Jagannath Salgaonkar <mahesh@linux.vnet.ibm.com>
To: Nicholas Piggin <npiggin@gmail.com>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
Santosh Sivaraj <santosh@fossix.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Mahesh Salgaonkar <mahesh@linux.ibm.com>,
Chandan Rajendra <chandan@linux.vnet.ibm.com>,
Reza Arbab <arbab@linux.ibm.com>
Subject: Re: [v2 09/12] powerpc/mce: Enable MCE notifiers in external modules
Date: Tue, 2 Jul 2019 15:03:17 +0530 [thread overview]
Message-ID: <5d1ea43b-6c8c-86d1-3646-c3e298725442@linux.vnet.ibm.com> (raw)
In-Reply-To: <1562047959.5y756f60wn.astroid@bobo.none>
On 7/2/19 11:47 AM, Nicholas Piggin wrote:
> Santosh Sivaraj's on July 2, 2019 3:19 pm:
>> From: Reza Arbab <arbab@linux.ibm.com>
>>
>> Signed-off-by: Reza Arbab <arbab@linux.ibm.com>
>> ---
>> arch/powerpc/kernel/exceptions-64s.S | 6 ++++++
>> arch/powerpc/kernel/mce.c | 2 ++
>> 2 files changed, 8 insertions(+)
>>
>> diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
>> index c83e38a403fd..311f1392a2ec 100644
>> --- a/arch/powerpc/kernel/exceptions-64s.S
>> +++ b/arch/powerpc/kernel/exceptions-64s.S
>> @@ -458,6 +458,12 @@ EXC_COMMON_BEGIN(machine_check_handle_early)
>> bl machine_check_early
>> std r3,RESULT(r1) /* Save result */
>>
>> + /* Notifiers may be in a module, so enable virtual addressing. */
>> + mfmsr r11
>> + ori r11,r11,MSR_IR
>> + ori r11,r11,MSR_DR
>> + mtmsr r11
>
> Can't do this, we could take a machine check somewhere the MMU is
> not sane (in fact the guest early mce handling that was added recently
> should not be enabling virtual mode either, which needs to be fixed).
Looks like they need this to be able to run notifier chain which may
fail in real mode.
>
> Thanks,
> Nick
>
next prev parent reply other threads:[~2019-07-02 9:35 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-02 5:19 [v2 00/12] powerpc: implement machine check safe memcpy Santosh Sivaraj
2019-07-02 5:19 ` [v2 01/12] powerpc/mce: Make machine_check_ue_event() static Santosh Sivaraj
2019-07-02 5:19 ` [v2 02/12] powerpc/mce: Bug fixes for MCE handling in kernel space Santosh Sivaraj
2019-07-02 5:19 ` [v2 03/12] powerpc/mce: Add MCE notification chain Santosh Sivaraj
2019-07-02 14:55 ` Reza Arbab
2019-07-02 5:19 ` [v2 04/12] powerpc/mce: Move machine_check_ue_event() call Santosh Sivaraj
2019-07-02 5:19 ` [v2 05/12] powerpc/mce: Allow notifier callback to handle MCE Santosh Sivaraj
2019-07-02 5:19 ` [v2 06/12] powerpc/mce: Add fixup address to UE events Santosh Sivaraj
2019-07-02 5:19 ` [v2 07/12] powerpc/memcpy: Add memcpy_mcsafe for pmem Santosh Sivaraj
2019-07-02 5:19 ` [v2 08/12] powerpc/mce: Handle memcpy_mcsafe() Santosh Sivaraj
2019-07-02 5:19 ` [v2 09/12] powerpc/mce: Enable MCE notifiers in external modules Santosh Sivaraj
2019-07-02 6:17 ` Nicholas Piggin
2019-07-02 9:33 ` Mahesh Jagannath Salgaonkar [this message]
2019-07-03 17:20 ` Reza Arbab
2019-07-04 2:36 ` Nicholas Piggin
2019-07-05 2:50 ` Reza Arbab
2019-07-05 5:29 ` Nicholas Piggin
2019-07-08 15:23 ` Reza Arbab
2019-07-02 5:19 ` [v2 10/12] powerpc/memcpy_mcsafe: return remaining bytes Santosh Sivaraj
2019-07-02 5:19 ` [v2 11/12] powerpc: add machine check safe copy_to_user Santosh Sivaraj
2019-07-02 5:19 ` [v2 12/12] powerpc/64s: Save r13 in machine_check_common_early Santosh Sivaraj
2019-07-02 6:19 ` Nicholas Piggin
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