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Message-ID: <f86e2e05-114a-cc9e-8f3a-96b36889063d@linux.ibm.com>
Date: Mon, 27 Jun 2022 16:57:42 -0400
From: Matthew Rosato <mjrosato@...ux.ibm.com>
To: linux-s390@...r.kernel.org
Cc: alex.williamson@...hat.com, cohuck@...hat.com,
schnelle@...ux.ibm.com, farman@...ux.ibm.com, pmorel@...ux.ibm.com,
borntraeger@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
svens@...ux.ibm.com, frankja@...ux.ibm.com, david@...hat.com,
imbrenda@...ux.ibm.com, vneethv@...ux.ibm.com,
oberpar@...ux.ibm.com, freude@...ux.ibm.com, thuth@...hat.com,
pasic@...ux.ibm.com, pbonzini@...hat.com, corbet@....net,
jgg@...dia.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org
Subject: Re: [PATCH v9 00/21] KVM: s390: enable zPCI for interpretive
execution
On 6/6/22 4:33 PM, Matthew Rosato wrote:
> Enable interpretive execution of zPCI instructions + adapter interruption
> forwarding for s390x KVM vfio-pci. This is done by triggering a routine
> when the VFIO group is associated with the KVM guest, transmitting to
> firmware a special token (GISA designation) to enable that specific guest
> for interpretive execution on that zPCI device. Load/store interpreation
> enablement is then controlled by userspace (based upon whether or not a
> SHM bit is placed in the virtual function handle). Adapter Event
> Notification interpretation is controlled from userspace via a new KVM
> ioctl.
>
> By allowing intepretation of zPCI instructions and firmware delivery of
> interrupts to guests, we can reduce the frequency of guest SIE exits for
> zPCI.
>
> From the perspective of guest configuration, you passthrough zPCI devices
> in the same manner as before, with intepretation support being used by
> default if available in kernel+qemu.
>
> Will follow up with a link the most recent QEMU series.
>
> Changelog v8->v9:
> - Rebase on top of 5.19-rc1, adjust ioctl and capability defines
> - s/kzdev = 0/kzdev = NULL/ (Alex)
> - rename vfio_pci_zdev_open to vfio_pci_zdev_open_device (Jason)
> - rename vfio_pci_zdev_release to vfio_pci_zdev_close_device (Jason)
> - make vfio_pci_zdev_close_device return void, instead WARN_ON or ignore
> errors in lower level function (kvm_s390_pci_unregister_kvm) (Jason)
> - remove notifier accidentally left in struct zpci_dev + associated
> include statment (Jason)
> - Remove patch 'KVM: s390: introduce CPU feature for zPCI Interpretation'
> based on discussion in QEMU thread.
>
Ping -- I'm hoping this can make the next merge window, but there are
still 2 patches left without any review tag (16 & 17).
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