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From: Catalin Marinas <catalin.marinas@arm.com>
To: James Morse <james.morse@arm.com>
Cc: Tony Luck <tony.luck@intel.com>, Fan Wu <wufan@codeaurora.org>,
	Xie XiuQi <xiexiuqi@huawei.com>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Rafael Wysocki <rjw@rjwysocki.net>,
	Christoffer Dall <christoffer.dall@arm.com>,
	Dongjiu Geng <gengdongjiu@huawei.com>,
	linux-mm@kvack.org, linux-acpi@vger.kernel.org,
	Borislav Petkov <bp@alien8.de>,
	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 v7 14/25] arm64: KVM/mm: Move SEA handling behind a single 'claim' interface
Date: Thu, 6 Dec 2018 16:17:30 +0000	[thread overview]
Message-ID: <20181206161730.GM54495@arrakis.emea.arm.com> (raw)
In-Reply-To: <20181203180613.228133-15-james.morse@arm.com>

On Mon, Dec 03, 2018 at 06:06:02PM +0000, James Morse wrote:
> To split up APEIs in_nmi() path, the caller needs to always be
> in_nmi(). Add a helper to do the work and claim the notification.
> 
> When KVM or the arch code takes an exception that might be a RAS
> notification, it asks the APEI firmware-first code whether it wants
> to claim the exception. A future kernel-first mechanism may be queried
> afterwards, and claim the notification, otherwise we fall through
> to the existing default behaviour.
> 
> The NOTIFY_SEA code was merged before considering multiple, possibly
> interacting, NMI-like notifications and the need to consider kernel
> first in the future. Make the 'claiming' behaviour explicit.
> 
> Restructuring the APEI code to allow multiple NMI-like notifications
> means any notification that might interrupt interrupts-masked
> code must always be wrapped in nmi_enter()/nmi_exit(). This will
> allow APEI to use in_nmi() to use the right fixmap entries.
> 
> Mask SError over this window to prevent an asynchronous RAS error
> arriving and tripping 'nmi_enter()'s BUG_ON(in_nmi()).
> 
> Signed-off-by: James Morse <james.morse@arm.com>
> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
> Tested-by: Tyler Baicar <tbaicar@codeaurora.org>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

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  reply	other threads:[~2018-12-06 16:17 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-03 18:05 [PATCH v7 00/25] APEI in_nmi() rework and SDEI wire-up James Morse
2018-12-03 18:05 ` [PATCH v7 01/25] ACPI / APEI: Don't wait to serialise with oops messages when panic()ing James Morse
2018-12-03 18:05 ` [PATCH v7 02/25] ACPI / APEI: Remove silent flag from ghes_read_estatus() James Morse
2018-12-04 11:36   ` Borislav Petkov
2018-12-03 18:05 ` [PATCH v7 03/25] ACPI / APEI: Switch estatus pool to use vmalloc memory James Morse
2018-12-04 13:01   ` Borislav Petkov
2018-12-03 18:05 ` [PATCH v7 04/25] ACPI / APEI: Make hest.c manage the estatus memory pool James Morse
2018-12-11 16:48   ` Borislav Petkov
2018-12-14 13:56     ` James Morse
2018-12-19 14:42       ` Borislav Petkov
2019-01-10 18:20         ` James Morse
2018-12-03 18:05 ` [PATCH v7 05/25] ACPI / APEI: Make estatus pool allocation a static size James Morse
2018-12-11 16:54   ` Borislav Petkov
2018-12-03 18:05 ` [PATCH v7 06/25] ACPI / APEI: Don't store CPER records physical address in struct ghes James Morse
2018-12-11 17:04   ` Borislav Petkov
2018-12-03 18:05 ` [PATCH v7 07/25] ACPI / APEI: Remove spurious GHES_TO_CLEAR check James Morse
2018-12-11 17:18   ` Borislav Petkov
2018-12-03 18:05 ` [PATCH v7 08/25] ACPI / APEI: Don't update struct ghes' flags in read/clear estatus James Morse
2018-12-03 18:05 ` [PATCH v7 09/25] ACPI / APEI: Generalise the estatus queue's notify code James Morse
2018-12-11 17:44   ` Borislav Petkov
2019-01-10 18:21     ` James Morse
2019-01-11 11:46       ` Borislav Petkov
2018-12-03 18:05 ` [PATCH v7 10/25] ACPI / APEI: Tell firmware the estatus queue consumed the records James Morse
2018-12-11 18:36   ` Borislav Petkov
2019-01-10 18:22     ` James Morse
2019-01-10 21:01       ` Tyler Baicar
2019-01-11 12:03         ` Borislav Petkov
2019-01-11 15:32           ` Tyler Baicar
2019-01-11 17:45             ` Borislav Petkov
2019-01-11 18:25               ` James Morse
2019-01-11 19:58                 ` Borislav Petkov
2019-01-23 18:36                   ` James Morse
2019-01-29 11:49                     ` Borislav Petkov
2019-01-29 18:48                       ` James Morse
2019-01-31 13:29                         ` Borislav Petkov
2019-01-11 18:09             ` James Morse
2019-01-11 20:01               ` Borislav Petkov
2019-01-11 20:53               ` Tyler Baicar
2019-01-29 18:48                 ` James Morse
2018-12-03 18:05 ` [PATCH v7 11/25] ACPI / APEI: Move NOTIFY_SEA between the estatus-queue and NOTIFY_NMI James Morse
2019-01-21 13:01   ` Borislav Petkov
2018-12-03 18:06 ` [PATCH v7 12/25] ACPI / APEI: Switch NOTIFY_SEA to use the estatus queue James Morse
2018-12-03 18:06 ` [PATCH v7 13/25] KVM: arm/arm64: Add kvm_ras.h to collect kvm specific RAS plumbing James Morse
2018-12-06 16:17   ` Catalin Marinas
2018-12-03 18:06 ` [PATCH v7 14/25] arm64: KVM/mm: Move SEA handling behind a single 'claim' interface James Morse
2018-12-06 16:17   ` Catalin Marinas [this message]
2018-12-03 18:06 ` [PATCH v7 15/25] ACPI / APEI: Move locking to the notification helper James Morse
2018-12-03 18:06 ` [PATCH v7 16/25] ACPI / APEI: Let the notification helper specify the fixmap slot James Morse
2018-12-03 18:06 ` [PATCH v7 17/25] ACPI / APEI: Pass ghes and estatus separately to avoid a later copy James Morse
2019-01-21 13:35   ` Borislav Petkov
2018-12-03 18:06 ` [PATCH v7 18/25] ACPI / APEI: Split ghes_read_estatus() to allow a peek at the CPER length James Morse
2019-01-21 13:53   ` Borislav Petkov
2018-12-03 18:06 ` [PATCH v7 19/25] ACPI / APEI: Only use queued estatus entry during _in_nmi_notify_one() James Morse
2019-01-21 17:19   ` Borislav Petkov
2018-12-03 18:06 ` [PATCH v7 20/25] ACPI / APEI: Use separate fixmap pages for arm64 NMI-like notifications James Morse
2019-01-21 17:27   ` Borislav Petkov
2019-01-23 18:33     ` James Morse
2019-01-31 13:38       ` Borislav Petkov
2018-12-03 18:06 ` [PATCH v7 21/25] mm/memory-failure: Add memory_failure_queue_kick() James Morse
2018-12-03 18:06 ` [PATCH v7 22/25] ACPI / APEI: Kick the memory_failure() queue for synchronous errors James Morse
2018-12-05  2:02   ` Xie XiuQi
2018-12-10 19:15     ` James Morse
2019-01-22 10:51       ` Borislav Petkov
2019-01-23 18:37         ` James Morse
2019-01-21 17:58   ` Borislav Petkov
2019-01-23 18:40     ` James Morse
2019-01-31 14:04       ` Borislav Petkov
2018-12-03 18:06 ` [PATCH v7 23/25] arm64: acpi: Make apei_claim_sea() synchronise with APEI's irq work James Morse
2018-12-06 16:18   ` Catalin Marinas
2018-12-03 18:06 ` [PATCH v7 24/25] firmware: arm_sdei: Add ACPI GHES registration helper James Morse
2018-12-06 16:18   ` Catalin Marinas
2018-12-03 18:06 ` [PATCH v7 25/25] ACPI / APEI: Add support for the SDEI GHES Notification type James Morse

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