From: james.morse@arm.com (James Morse)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] kvm: pass the virtual SEI syndrome to guest OS
Date: Tue, 28 Mar 2017 11:48:08 +0100 [thread overview]
Message-ID: <58DA3F68.6090901@arm.com> (raw)
In-Reply-To: <20170321193933.GB31111@cbox>
Hi Christoffer,
(CC: Leif and Achin who know more about how UEFI fits into this picture)
On 21/03/17 19:39, Christoffer Dall wrote:
> On Tue, Mar 21, 2017 at 07:11:44PM +0000, James Morse wrote:
>> On 21/03/17 11:34, Christoffer Dall wrote:
>>> On Tue, Mar 21, 2017 at 02:32:29PM +0800, gengdongjiu wrote:
>>>> On 2017/3/20 23:08, James Morse wrote:
>>>>>>>> On 20/03/17 07:55, Dongjiu Geng wrote:
>>>>>>>>> In the RAS implementation, hardware pass the virtual SEI
>>>>>>>>> syndrome information through the VSESR_EL2, so set the virtual
>>>>>>>>> SEI syndrome using physical SEI syndrome el2_elr to pass to
>>>>>>>>> the guest OS
>>>>>
>>>>> How does this work with firmware first?
>>>>
>>>> I explained it in previous mail about the work flow.
>>>
>>> When delivering and reporting SEIs to the VM, should this happen
>>> directly to the OS running in the VM, or to the guest firmware (e.g.
>>> UEFI) running in the VM as well?
>>
>> 'firmware first' is the ACPI specs name for x86's BIOS or management-mode
>> handling the error. On arm64 we have multiple things called firmware, so the
>> name might be more confusing than helpful.
>>
>> As far as I understand it, firmware here refers to the secure-world and EL3.
>> Something like ATF can use SCR_EL3.EA to claim SErrors and external aborts,
>> routing them to EL3 where secure platform specific firmware generates CPER records.
>> For a guest, Qemu takes the role of this EL3-firmware.
>>
> Thanks for the clarification. So UEFI in the VM would not be involved
> in this at all?
On the host, part of UEFI is involved to generate the CPER records.
In a guest?, I don't know.
Qemu could generate the records, or drive some other component to do it.
Leif and Achin are the people with the UEFI/bigger picture.
> My confusion here comes from not thinking about QEMU or KVM as firmware,
> but as the machine, so it would be sort of like the functionality is
> baked into hardware rather than firmware.
>
> Note that to the VM, the environment will look like hardware without EL3
> and without a secure world, so any software assuming there's something
> 'hidden' behind the available non-secure modes must not decide to
> disable features if discovering the lack of a secure world.
Thanks,
James
next prev parent reply other threads:[~2017-03-28 10:48 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-20 7:55 [PATCH] kvm: pass the virtual SEI syndrome to guest OS Dongjiu Geng
2017-03-20 11:24 ` Marc Zyngier
2017-03-20 12:28 ` gengdongjiu
2017-03-20 13:58 ` Marc Zyngier
2017-03-20 15:08 ` James Morse
2017-03-21 6:32 ` gengdongjiu
2017-03-21 11:34 ` Christoffer Dall
2017-03-21 19:11 ` James Morse
2017-03-21 19:39 ` Christoffer Dall
2017-03-21 22:10 ` Peter Maydell
2017-03-22 11:15 ` Marc Zyngier
2017-03-28 10:48 ` James Morse [this message]
2017-03-28 11:23 ` Christoffer Dall
2017-03-28 11:33 ` Peter Maydell
2017-03-28 13:27 ` James Morse
2017-03-28 11:54 ` Achin Gupta
2017-03-28 12:16 ` gengdongjiu
2017-03-28 13:40 ` James Morse
2017-03-29 9:36 ` gengdongjiu
2017-03-29 10:36 ` Achin Gupta
2017-03-29 11:58 ` Laszlo Ersek
2017-03-29 12:51 ` Michael S. Tsirkin
2017-03-29 13:36 ` Laszlo Ersek
2017-03-29 13:54 ` Michael S. Tsirkin
2017-03-29 13:56 ` Punit Agrawal
2017-04-06 12:35 ` gengdongjiu
2017-04-06 18:55 ` Laszlo Ersek
2017-04-07 2:52 ` gengdongjiu
2017-04-07 9:21 ` Laszlo Ersek
2017-04-21 13:27 ` gengdongjiu
2017-04-24 11:27 ` Laszlo Ersek
2017-03-29 14:36 ` gengdongjiu
2017-03-29 14:48 ` Christoffer Dall
2017-03-29 15:37 ` Laszlo Ersek
2017-03-29 17:44 ` Christoffer Dall
2017-03-30 1:22 ` gengdongjiu
2017-03-28 12:22 ` Christoffer Dall
2017-03-28 13:24 ` Achin Gupta
2017-03-28 13:40 ` Christoffer Dall
2017-03-21 13:10 ` James Morse
2017-03-22 13:37 ` gengdongjiu
2017-03-22 18:56 ` James Morse
2017-03-21 6:07 ` gengdongjiu
2017-03-21 13:51 ` kbuild test robot
2017-03-22 3:20 ` gengdongjiu
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