Re: [PATCH v4 00/21] Support SDEI Virtualization

[Gavin Shan]

Hi Eric,

On 11/10/21 10:29 PM, Eric Auger wrote:
> On 8/15/21 2:19 AM, Gavin Shan wrote:
> > On 8/15/21 10:13 AM, Gavin Shan wrote:
> > > This series intends to virtualize Software Delegated Exception Interface
> > > (SDEI), which is defined by DEN0054A. It allows the hypervisor to deliver
> > > NMI-alike event to guest and it's needed by asynchronous page fault 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/latest
> > >      https://github.com/gwshan/linux   ; ("kvm/arm64_sdei")
> > >      https://github.com/gwshan/qemu    ; ("kvm/arm64_sdei")
> > >
> > > The SDEI event is identified by a 32-bits number. Bits[31:24] are used
> > > to indicate the SDEI event properties while bits[23:0] are identifying
> > > the unique number. The implementation takes bits[23:22] to indicate the
> > > owner of the SDEI event. For example, those SDEI events owned by KVM
> > > should have these two bits set to 0b01. Besides, the implementation
> > > supports SDEI events owned by KVM only.
> > >
> > > The design is pretty straightforward and the implementation is just
> > > following the SDEI specification, to support the defined SMCCC intefaces,
> > > except the IRQ binding stuff. There are several data structures
> > > introduced.
> > > Some of the objects have to be migrated by VMM. So their definitions are
> > > split up for VMM to include the corresponding states for migration.
> > >
> > >      struct kvm_sdei_kvm
> > >         Associated with VM and used to track the KVM exposed SDEI events
> > >         and those registered by guest.
> > >      struct kvm_sdei_vcpu
> > >         Associated with vCPU and used to track SDEI event delivery. The
> > >         preempted context is saved prior to the delivery and restored
> > >         after that.
> > >      struct kvm_sdei_event
> > >         SDEI events exposed by KVM so that guest can register and enable.
> > >      struct kvm_sdei_kvm_event
> > >         SDEI events that have been registered by guest.
> > >      struct kvm_sdei_vcpu_event
> > >         SDEI events that have been queued to specific vCPU for delivery.
> > >
> > > The series is organized as below:
> > >
> > >      PATCH[01]    Introduces template for smccc_get_argx()
> > >      PATCH[02]    Introduces the data structures and infrastructure
> > >      PATCH[03-14] Supports various SDEI related hypercalls
> > >      PATCH[15]    Supports SDEI event notification
> > >      PATCH[16-17] Introduces ioctl command for migration
> > >      PATCH[18-19] Supports SDEI event injection and cancellation
> > >      PATCH[20]    Exports SDEI capability
> > >      PATCH[21]    Adds self-test case for SDEI virtualization
> >
> > [...]
> >
> > I explicitly copied James Morse and Mark Rutland when posting the series,
> > but something unknown went wrong. I'm including them here to avoid
> > reposting the whole series.
> I don't see James nor Mark included here either

Yeah, I used the following command to post the series, but I don't know
why James/Mark are missed. I'm not sure it's git-sendemail issue or not
so far. The issue appears some times on my laptop :)

# git-sendemail --to=<mail0> --cc=<mail1> --cc=<mail2> *.patch

Thanks,
Gavin