From: Borislav Petkov <bp@alien8.de>
To: James Morse <james.morse@arm.com>
Cc: jonathan.zhang@cavium.com, Rafael Wysocki <rjw@rjwysocki.net>,
Tony Luck <tony.luck@intel.com>,
linux-mm@kvack.org, Marc Zyngier <marc.zyngier@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Tyler Baicar <tbaicar@codeaurora.org>,
Will Deacon <will.deacon@arm.com>,
Dongjiu Geng <gengdongjiu@huawei.com>,
linux-acpi@vger.kernel.org, Punit Agrawal <punit.agrawal@arm.com>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org, Len Brown <lenb@kernel.org>
Subject: Re: [PATCH v6 00/18] APEI in_nmi() rework
Date: Tue, 25 Sep 2018 14:45:26 +0200 [thread overview]
Message-ID: <20180925124526.GD23986@zn.tnic> (raw)
In-Reply-To: <20180921221705.6478-1-james.morse@arm.com>
On Fri, Sep 21, 2018 at 11:16:47PM +0100, James Morse wrote:
> Hello,
>
> The GHES driver has collected quite a few bugs:
>
> ghes_proc() at ghes_probe() time can be interrupted by an NMI that
> will clobber the ghes->estatus fields, flags, and the buffer_paddr.
>
> ghes_copy_tofrom_phys() uses in_nmi() to decide which path to take. arm64's
> SEA taking both paths, depending on what it interrupted.
>
> There is no guarantee that queued memory_failure() errors will be processed
> before this CPU returns to user-space.
>
> x86 can't TLBI from interrupt-masked code which this driver does all the
> time.
>
>
> This series aims to fix the first three, with an eye to fixing the
> last one with a follow-up series.
>
> Previous postings included the SDEI notification calls, which I haven't
> finished re-testing. This series is big enough as it is.
Yeah, and everywhere I look, this thing looks overengineered. Like,
for example, what's the purpose of this ghes_esource_prealloc_size()
computing a size each time the pool changes size?
AFAICT, this size can be computed exactly *once* at driver init and be
done with it. Right?
Or am I missing something subtle?
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
WARNING: multiple messages have this Message-ID (diff)
From: Borislav Petkov <bp@alien8.de>
To: James Morse <james.morse@arm.com>
Cc: linux-acpi@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
Marc Zyngier <marc.zyngier@arm.com>,
Christoffer Dall <christoffer.dall@arm.com>,
Will Deacon <will.deacon@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Rafael Wysocki <rjw@rjwysocki.net>, Len Brown <lenb@kernel.org>,
Tony Luck <tony.luck@intel.com>,
Tyler Baicar <tbaicar@codeaurora.org>,
Dongjiu Geng <gengdongjiu@huawei.com>,
Xie XiuQi <xiexiuqi@huawei.com>,
Punit Agrawal <punit.agrawal@arm.com>,
jonathan.zhang@cavium.com
Subject: Re: [PATCH v6 00/18] APEI in_nmi() rework
Date: Tue, 25 Sep 2018 14:45:26 +0200 [thread overview]
Message-ID: <20180925124526.GD23986@zn.tnic> (raw)
In-Reply-To: <20180921221705.6478-1-james.morse@arm.com>
On Fri, Sep 21, 2018 at 11:16:47PM +0100, James Morse wrote:
> Hello,
>
> The GHES driver has collected quite a few bugs:
>
> ghes_proc() at ghes_probe() time can be interrupted by an NMI that
> will clobber the ghes->estatus fields, flags, and the buffer_paddr.
>
> ghes_copy_tofrom_phys() uses in_nmi() to decide which path to take. arm64's
> SEA taking both paths, depending on what it interrupted.
>
> There is no guarantee that queued memory_failure() errors will be processed
> before this CPU returns to user-space.
>
> x86 can't TLBI from interrupt-masked code which this driver does all the
> time.
>
>
> This series aims to fix the first three, with an eye to fixing the
> last one with a follow-up series.
>
> Previous postings included the SDEI notification calls, which I haven't
> finished re-testing. This series is big enough as it is.
Yeah, and everywhere I look, this thing looks overengineered. Like,
for example, what's the purpose of this ghes_esource_prealloc_size()
computing a size each time the pool changes size?
AFAICT, this size can be computed exactly *once* at driver init and be
done with it. Right?
Or am I missing something subtle?
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
WARNING: multiple messages have this Message-ID (diff)
From: bp@alien8.de (Borislav Petkov)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v6 00/18] APEI in_nmi() rework
Date: Tue, 25 Sep 2018 14:45:26 +0200 [thread overview]
Message-ID: <20180925124526.GD23986@zn.tnic> (raw)
In-Reply-To: <20180921221705.6478-1-james.morse@arm.com>
On Fri, Sep 21, 2018 at 11:16:47PM +0100, James Morse wrote:
> Hello,
>
> The GHES driver has collected quite a few bugs:
>
> ghes_proc() at ghes_probe() time can be interrupted by an NMI that
> will clobber the ghes->estatus fields, flags, and the buffer_paddr.
>
> ghes_copy_tofrom_phys() uses in_nmi() to decide which path to take. arm64's
> SEA taking both paths, depending on what it interrupted.
>
> There is no guarantee that queued memory_failure() errors will be processed
> before this CPU returns to user-space.
>
> x86 can't TLBI from interrupt-masked code which this driver does all the
> time.
>
>
> This series aims to fix the first three, with an eye to fixing the
> last one with a follow-up series.
>
> Previous postings included the SDEI notification calls, which I haven't
> finished re-testing. This series is big enough as it is.
Yeah, and everywhere I look, this thing looks overengineered. Like,
for example, what's the purpose of this ghes_esource_prealloc_size()
computing a size each time the pool changes size?
AFAICT, this size can be computed exactly *once* at driver init and be
done with it. Right?
Or am I missing something subtle?
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
next prev parent reply other threads:[~2018-09-25 12:45 UTC|newest]
Thread overview: 123+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-21 22:16 [PATCH v6 00/18] APEI in_nmi() rework James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` [PATCH v6 01/18] ACPI / APEI: Move the estatus queue code up, and under its own ifdef James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` [PATCH v6 02/18] ACPI / APEI: Generalise the estatus queue's add/remove and notify code James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` [PATCH v6 03/18] ACPI / APEI: don't wait to serialise with oops messages when panic()ing James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` [PATCH v6 04/18] ACPI / APEI: Switch NOTIFY_SEA to use the estatus queue James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` James Morse
2018-09-28 17:04 ` Borislav Petkov
2018-09-28 17:04 ` Borislav Petkov
2018-09-28 17:04 ` Borislav Petkov
2018-09-21 22:16 ` [PATCH v6 05/18] ACPI / APEI: Make estatus queue a Kconfig symbol James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` James Morse
2018-10-01 17:59 ` Borislav Petkov
2018-10-01 17:59 ` Borislav Petkov
2018-10-01 17:59 ` Borislav Petkov
2018-10-03 17:50 ` James Morse
2018-10-03 17:50 ` James Morse
2018-10-03 17:50 ` James Morse
2018-10-04 17:34 ` Borislav Petkov
2018-10-04 17:34 ` Borislav Petkov
2018-10-04 17:34 ` Borislav Petkov
2018-10-12 17:17 ` James Morse
2018-10-12 17:17 ` James Morse
2018-10-12 17:17 ` James Morse
2018-10-12 18:10 ` Borislav Petkov
2018-10-12 18:10 ` Borislav Petkov
2018-10-12 18:10 ` Borislav Petkov
2018-09-21 22:16 ` [PATCH v6 06/18] KVM: arm/arm64: Add kvm_ras.h to collect kvm specific RAS plumbing James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` James Morse
2018-10-12 9:57 ` Borislav Petkov
2018-10-12 9:57 ` Borislav Petkov
2018-10-12 9:57 ` Borislav Petkov
2018-10-12 17:18 ` James Morse
2018-10-12 17:18 ` James Morse
2018-10-12 17:18 ` James Morse
2018-09-21 22:16 ` [PATCH v6 07/18] arm64: KVM/mm: Move SEA handling behind a single 'claim' interface James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` James Morse
2018-10-12 10:02 ` Borislav Petkov
2018-10-12 10:02 ` Borislav Petkov
2018-10-12 10:02 ` Borislav Petkov
2018-10-12 17:18 ` James Morse
2018-10-12 17:18 ` James Morse
2018-10-12 17:18 ` James Morse
2018-09-21 22:16 ` [PATCH v6 08/18] ACPI / APEI: Move locking to the notification helper James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` James Morse
2018-10-12 11:08 ` Borislav Petkov
2018-10-12 11:08 ` Borislav Petkov
2018-10-12 11:08 ` Borislav Petkov
2018-09-21 22:16 ` [PATCH v6 09/18] ACPI / APEI: Let the notification helper specify the fixmap slot James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` James Morse
2018-10-12 11:14 ` Borislav Petkov
2018-10-12 11:14 ` Borislav Petkov
2018-10-12 11:14 ` Borislav Petkov
2018-09-21 22:16 ` [PATCH v6 10/18] ACPI / APEI: preparatory split of ghes->estatus James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` James Morse
2018-10-12 16:37 ` Borislav Petkov
2018-10-12 16:37 ` Borislav Petkov
2018-10-12 16:37 ` Borislav Petkov
2018-09-21 22:16 ` [PATCH v6 11/18] ACPI / APEI: Remove silent flag from ghes_read_estatus() James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` James Morse
2018-10-12 16:55 ` Borislav Petkov
2018-10-12 16:55 ` Borislav Petkov
2018-10-12 16:55 ` Borislav Petkov
2018-09-21 22:16 ` [PATCH v6 12/18] ACPI / APEI: Don't store CPER records physical address in struct ghes James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:16 ` James Morse
2018-09-21 22:17 ` [PATCH v6 13/18] ACPI / APEI: Don't update struct ghes' flags in read/clear estatus James Morse
2018-09-21 22:17 ` James Morse
2018-09-21 22:17 ` James Morse
2018-10-12 17:14 ` Borislav Petkov
2018-10-12 17:14 ` Borislav Petkov
2018-10-12 17:14 ` Borislav Petkov
2018-09-21 22:17 ` [PATCH v6 14/18] ACPI / APEI: Split ghes_read_estatus() to read CPER length James Morse
2018-09-21 22:17 ` James Morse
2018-09-21 22:17 ` James Morse
2018-10-12 17:25 ` Borislav Petkov
2018-10-12 17:25 ` Borislav Petkov
2018-10-12 17:25 ` Borislav Petkov
2018-09-21 22:17 ` [PATCH v6 15/18] ACPI / APEI: Only use queued estatus entry during _in_nmi_notify_one() James Morse
2018-09-21 22:17 ` James Morse
2018-09-21 22:17 ` James Morse
2018-10-12 17:34 ` Borislav Petkov
2018-10-12 17:34 ` Borislav Petkov
2018-10-12 17:34 ` Borislav Petkov
2018-09-21 22:17 ` [PATCH v6 16/18] ACPI / APEI: Split fixmap pages for arm64 NMI-like notifications James Morse
2018-09-21 22:17 ` James Morse
2018-09-21 22:17 ` James Morse
2018-09-21 22:17 ` [PATCH v6 17/18] mm/memory-failure: increase queued recovery work's priority James Morse
2018-09-21 22:17 ` James Morse
2018-09-21 22:17 ` James Morse
2018-10-15 16:49 ` Borislav Petkov
2018-10-15 16:49 ` Borislav Petkov
2018-10-15 16:49 ` Borislav Petkov
2018-10-16 7:43 ` Peter Zijlstra
2018-10-16 7:43 ` Peter Zijlstra
2018-10-16 7:43 ` Peter Zijlstra
2018-09-21 22:17 ` [PATCH v6 18/18] arm64: acpi: Make apei_claim_sea() synchronise with APEI's irq work James Morse
2018-09-21 22:17 ` James Morse
2018-09-21 22:17 ` James Morse
2018-09-25 12:45 ` Borislav Petkov [this message]
2018-09-25 12:45 ` [PATCH v6 00/18] APEI in_nmi() rework Borislav Petkov
2018-09-25 12:45 ` Borislav Petkov
2018-10-03 17:50 ` James Morse
2018-10-03 17:50 ` James Morse
2018-10-03 17:50 ` James Morse
2018-10-04 15:15 ` Borislav Petkov
2018-10-04 15:15 ` Borislav Petkov
2018-10-04 15:15 ` Borislav Petkov
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