linux-kernel - Re: [PATCH v6 00/18] Support SDEI Virtualization

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Date:   Sun, 3 Apr 2022 23:47:07 +0800
From:   Gavin Shan <gshan@...hat.com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     maz@...nel.org, linux-kernel@...r.kernel.org, eauger@...hat.com,
        shan.gavin@...il.com, Jonathan.Cameron@...wei.com,
        pbonzini@...hat.com, vkuznets@...hat.com, will@...nel.org,
        Oliver Upton <oupton@...gle.com>,
        James Morse <james.morse@....com>,
        Mark Rutland <mark.rutland@....com>,
        Shannon Zhao <shannon.zhaosl@...il.com>
Subject: Re: [PATCH v6 00/18] Support SDEI Virtualization

On 4/3/22 11:38 PM, Gavin Shan wrote:
> This series intends to virtualize Software Delegated Exception Interface
> (SDEI), which is defined by DEN0054C (v1.1). It allows the hypervisor to
> deliver NMI-alike SDEI event to guest and it's needed by Async PF to
> deliver page-not-present notification from hypervisor to guest. The code
> and the required qemu changes can be found from:
> 
>     https://developer.arm.com/documentation/den0054/c
>     https://github.com/gwshan/linux    ("kvm/arm64_sdei")
>     https://github.com/gwshan/qemu     ("kvm/arm64_sdei")
> 
> The design is quite strightforward by following the specification. The
> (SDEI) events are classified into the shared and private ones according
> to their scope. The shared event is system or VM scoped, but the private
> event is vcpu scoped. This implementation doesn't support the shared
> event because all the needed events are private. Besides, the migration
> isn't supported by implementation and it's something to be supported
> in future.
> 
> There are several objects (data structures) introduced to help on the
> event registration, enablement, disablement, unregistration, reset,
> delivery and handling.
> 
>    * kvm_sdei_exposed_event
>      The event which are defined and exposed by KVM. The event can't
>      be registered until it's exposed. Besides, all the information
>      in this event can't be changed after it's exposed.
>      
>    * kvm_sdei_event
>      The events are created based on the exposed events. Their states
>      are changed when hypercalls are received or they are delivered
>      to guest for handling.
>      
>    * kvm_sdei_vcpu_context
>      The vcpu context helps to handle events. The interrupted context
>      is saved before the event handler is executed, and restored after
>      the event handler is to finish.
>      
>    * kvm_sdei_vcpu
>      Place holder for all objects for one particular VCPU.
> 
> The patches are organized as below:
> 
>    PATCH[01-02] Preparatory work to extend smccc_get_argx() and refactor
>                 hypercall routing mechanism
>    PATCH[03]    Adds SDEI virtualization infrastructure
>    PATCH[04-16] Supports various SDEI hypercalls and event handling
>    PATCH[17]    Exposes SDEI capability
>    PATCH[18]    Adds SDEI selftest case
>    
> The previous revisions can be found:
> 
>    v5: https://lore.kernel.org/kvmarm/20220322080710.51727-1-gshan@redhat.com/
>    v4: https://lore.kernel.org/kvmarm/20210815001352.81927-1-gshan@redhat.com/
>    v3: https://lore.kernel.org/kvmarm/20210507083124.43347-1-gshan@redhat.com/
>    v2: https://lore.kernel.org/kvmarm/20210209032733.99996-1-gshan@redhat.com/
>    v1: https://lore.kernel.org/kvmarm/20200817100531.83045-1-gshan@redhat.com/
> 

I'm explicitly copying Oliver, James, Mark and Shannon to avoid resending this series.
It seems they have been skipped even I explicitly copied them by 'git send-email --cc=<email-addr>'.

[...]

Thanks,
Gavin