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From: Nicholas Piggin <npiggin@gmail.com>
To: linux-kernel@vger.kernel.org,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	Santosh Sivaraj <santosh@fossix.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
	Reza Arbab <arbab@linux.ibm.com>,
	Balbir Singh <bsingharora@gmail.com>,
	Chandan Rajendra <chandan@linux.vnet.ibm.com>,
	christophe leroy <christophe.leroy@c-s.fr>,
	Mahesh Salgaonkar <mahesh@linux.ibm.com>,
	Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: [v5 5/6] powerpc/mce: Handle UE event for memcpy_mcsafe
Date: Thu, 11 Jul 2019 19:52:59 +1000	[thread overview]
Message-ID: <1562838616.xzrha67fy6.astroid@bobo.none> (raw)
In-Reply-To: <20190709121524.18762-6-santosh@fossix.org>

Santosh Sivaraj's on July 9, 2019 10:15 pm:
> If we take a UE on one of the instructions with a fixup entry, set nip
> to continue execution at the fixup entry. Stop processing the event
> further or print it.

So... what happens if we take a machine check while we happen to be
executing some other kernel operation with a fixup entry?

Or the other way around, what happens if memcpy_mcsafe takes a page
fault for some reason (e.g., kernel bug it tries to access unmapped
memory).

Thanks,
Nick


  reply	other threads:[~2019-07-11  9:56 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-09 12:15 [v5 0/6] powerpc: implement machine check safe memcpy Santosh Sivaraj
2019-07-09 12:15 ` [v5 1/6] powerpc/mce: Make machine_check_ue_event() static Santosh Sivaraj
2019-07-09 12:15 ` [v5 2/6] powerpc/mce: Fix MCE handling for huge pages Santosh Sivaraj
2019-07-11  9:38   ` Nicholas Piggin
2019-07-09 12:15 ` [v5 3/6] powerpc/memcpy: Add memcpy_mcsafe for pmem Santosh Sivaraj
2019-07-11  9:50   ` Nicholas Piggin
2019-07-09 12:15 ` [v5 4/6] extable: Add function to search only kernel exception table Santosh Sivaraj
2019-07-11  9:47   ` Nicholas Piggin
2019-07-09 12:15 ` [v5 5/6] powerpc/mce: Handle UE event for memcpy_mcsafe Santosh Sivaraj
2019-07-11  9:52   ` Nicholas Piggin [this message]
2019-07-09 12:15 ` [v5 6/6] powerpc: add machine check safe copy_to_user Santosh Sivaraj

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