From: Marc Zyngier <marc.zyngier@arm.com>
To: Xiongfeng Wang <wangxiongfeng2@huawei.com>,
James Morse <james.morse@arm.com>
Cc: punit.agrawal@arm.com, mark.rutland@arm.com,
linux-efi@vger.kernel.org, kvm@vger.kernel.org,
rkrcmar@redhat.com, matt@codeblueprint.co.uk,
catalin.marinas@arm.com, Tyler Baicar <tbaicar@codeaurora.org>,
will.deacon@arm.com, linux@armlinux.org.uk,
paul.gortmaker@windriver.com, lv.zheng@intel.com,
kvmarm@lists.cs.columbia.edu, fu.wei@linaro.org, tn@semihalf.com,
zjzhang@codeaurora.org, robert.moore@intel.com,
linux-acpi@vger.kernel.org, eun.taik.lee@samsung.com,
shijie.huang@arm.com, labbott@redhat.com, lenb@kernel.org,
harba@codeaurora.org, Suzuki.Poulose@arm.com,
john.garry@huawei.com, rostedt@goodmis.org, nkaje@codeaurora.org,
sandeepa.s.prabhu@gmail.com,
linux-arm-kernel@lists.infradead.org, devel@acpica.org,
rjw@rjwysocki.net, rruigrok@codeaurora.org,
linux-kernel@vger.kernel.org, astone@redhat.com,
hanjun.guo@linaro.org, joe@perches.com, pbonzini@redhat.com,
akpm@linux-foundation.org, bristot@redhat.com,
christoffer.dall@linaro.org, shiju.jose@huawei.com
Subject: Re: [PATCH V11 10/10] arm/arm64: KVM: add guest SEA support
Date: Thu, 2 Mar 2017 09:39:21 +0000 [thread overview]
Message-ID: <6d0fa5a5-bcbf-38b8-45ac-d645220ee9e2@arm.com> (raw)
In-Reply-To: <4ff98823-d6f0-eb2e-4b98-f6d5e255f6c3@huawei.com>
On 01/03/17 02:31, Xiongfeng Wang wrote:
[lot of things]
> If an SEA is injected into guest OS, the guest OS will jump to the SEA
> exception entry when the context switched to guest OS. And the CPSR and
> FAR_EL1 are recovered according to the content of vcpu. Then the guest
> OS can signal a process or panic. If another guest process read the
> error data, another SEA will be generated and it will be single too.
>
> Without QEMU involved, the drawback is that no APEI table can be mocked
> up in guest OS, and no memory_failure() will be called. So the memory of
> error data will be released into buddy system and assigned to another
> process. If the error was caused by instantaneous radiation or
> electromagnetic, the memory is usable again if it is written with a
> correct data. If the memory has wore out and a correct data is written,
> the ECC error may occurs again with high possibility. Before a 2-bit ECC
> error is reported, much more 1-bit errors will be reported. This is
> report to host os, the host os can determine the memory node has worn
> out and hot-plug out the memory node, and guest os may be terminated if
> its memory data can't be migrated.
>
> Of course, it is better to get QEMU involved, so the memory_failure can
> be executed in guest OS. But before that implemented, can we add SEA
> injection in kvm_handle_guest_abort()?
No. I will strongly object to that. This is a platform decision to
forward SEAs, not an architectural one. The core KVM code is only
concerned about implementing the ARM architecture, and not something
that is firmware dependent.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
next prev parent reply other threads:[~2017-03-02 9:41 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-21 21:21 [PATCH V11 00/10] Add UEFI 2.6 and ACPI 6.1 updates for RAS on ARM64 Tyler Baicar
2017-02-21 21:21 ` [PATCH V11 01/10] acpi: apei: read ack upon ghes record consumption Tyler Baicar
2017-02-21 21:21 ` [PATCH V11 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1 Tyler Baicar
2017-02-21 21:21 ` [PATCH V11 03/10] efi: parse ARM processor error Tyler Baicar
2017-02-21 21:21 ` [PATCH V11 04/10] arm64: exception: handle Synchronous External Abort Tyler Baicar
2017-02-21 21:21 ` [PATCH V11 05/10] acpi: apei: handle SEA notification type for ARMv8 Tyler Baicar
2017-03-01 7:42 ` Xie XiuQi
2017-03-01 19:22 ` Baicar, Tyler
2017-02-21 21:21 ` [PATCH V11 06/10] acpi: apei: panic OS with fatal error status block Tyler Baicar
2017-02-21 21:21 ` [PATCH V11 07/10] efi: print unrecognized CPER section Tyler Baicar
2017-02-21 21:21 ` [PATCH V11 08/10] ras: acpi / apei: generate trace event for " Tyler Baicar
2017-02-21 21:22 ` [PATCH V11 09/10] trace, ras: add ARM processor error trace event Tyler Baicar
2017-02-21 21:22 ` [PATCH V11 10/10] arm/arm64: KVM: add guest SEA support Tyler Baicar
2017-02-24 10:42 ` James Morse
2017-02-27 11:31 ` gengdongjiu
2017-02-28 19:43 ` Baicar, Tyler
2017-03-06 10:28 ` James Morse
2017-03-06 14:00 ` Baicar, Tyler
2017-02-25 7:15 ` Xiongfeng Wang
2017-02-27 13:58 ` James Morse
2017-02-28 6:25 ` Xiongfeng Wang
2017-02-28 13:21 ` James Morse
2017-03-01 2:31 ` Xiongfeng Wang
2017-03-02 9:39 ` Marc Zyngier [this message]
2017-03-06 3:38 ` Xiongfeng Wang
2017-03-06 1:28 ` gengdongjiu
2017-03-22 2:46 ` Xiongfeng Wang
2017-03-22 11:14 ` James Morse
2017-03-22 12:08 ` Xie XiuQi
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