Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS

From	James Morse <james.morse@arm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS
Date	2017-03-21 20:20 +0100
Message-ID	<tnxu2-7Db-31@gated-at.bofh.it> (permalink)
References	(2 earlier) <tn4Ln-4J7-9@gated-at.bofh.it> <tn60P-5sH-47@gated-at.bofh.it> <tn7gd-6yN-5@gated-at.bofh.it> <tnlCx-7XR-1@gated-at.bofh.it> <tnqsz-2K1-39@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi Christoffer,

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,

James

Thread

[PATCH] kvm: pass the virtual SEI syndrome to guest OS Dongjiu Geng <gengdongjiu@huawei.com> - 2017-03-20 08:50 +0100
  Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS Marc Zyngier <marc.zyngier@arm.com> - 2017-03-20 12:30 +0100
    Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS gengdongjiu <gengdongjiu@huawei.com> - 2017-03-20 13:40 +0100
      Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS Marc Zyngier <marc.zyngier@arm.com> - 2017-03-20 15:00 +0100
        Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS James Morse <james.morse@arm.com> - 2017-03-20 16:20 +0100
          Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS gengdongjiu <gengdongjiu@huawei.com> - 2017-03-21 07:40 +0100
            Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS Christoffer Dall <cdall@linaro.org> - 2017-03-21 12:50 +0100
              Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS James Morse <james.morse@arm.com> - 2017-03-21 20:20 +0100
                Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS Christoffer Dall <cdall@linaro.org> - 2017-03-21 21:00 +0100
                Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS Peter Maydell <peter.maydell@linaro.org> - 2017-03-21 23:20 +0100
                Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS Marc Zyngier <marc.zyngier@arm.com> - 2017-03-22 12:20 +0100
            Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS James Morse <james.morse@arm.com> - 2017-03-21 14:20 +0100
              Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS gengdongjiu <gengdongjiu@huawei.com> - 2017-03-22 14:50 +0100
                Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS James Morse <james.morse@arm.com> - 2017-03-22 20:00 +0100
        Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS gengdongjiu <gengdongjiu@huawei.com> - 2017-03-21 07:10 +0100

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