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 ngylhhar xRhPXSHihdVh1CvE3IPvw3kZ1bLzIlTTr2OhhIg3TJuMtmMxLiEkBLOBXqEUzpDofYEF/s2d1Z2iRmNl7Ylpv19w2CwszYlwA8d0nq01o9th0sWBBBlC7TXl/PdRHaaNdMkYcBgs7zDszfj1U7oGQs4N2UgXHzoPc1Mtmu/QUy4GQeOZJS8dejrAIkLbivxxAWEFZ4zDMIEAxIZcZ3CEoNxjFCPGHetVGHmTiy+QgdVj4hEeL0/tVFfsEFtRFvWsBArI85ObZzsHaZ3qQ8a/PgS+MJZcLswM+87LP53yQSs//i2SYgSMNjIrsbbm5QfsYcoEfW6kAIqGalM1NjnoYuMbrtCrRpALj9SndRdE2EEfRB4Ak/sOEBptEhcLQluQtREFMw4Oi9n2wtkWQFKAn2MOTq+noJTxzg0JMq8VdOXpWhKA4tBieVIjGxJuzVYm8qjanycDwMefZrS0= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Apr 21, 2026 at 10:40:29AM -0700, David Matlack wrote: > On Mon, Mar 23, 2026 at 4:58 PM David Matlack wrote: > > > +static int vfio_pci_liveupdate_freeze(struct liveupdate_file_op_args *args) > > +{ > > + struct vfio_device *device = vfio_device_from_file(args->file); > > + struct vfio_pci_core_device *vdev; > > + struct pci_dev *pdev; > > + int ret; > > + > > + vdev = container_of(device, struct vfio_pci_core_device, vdev); > > + pdev = vdev->pdev; > > + > > + guard(mutex)(&device->dev_set->lock); > > + > > + /* > > + * Userspace must disable interrupts on the device prior to freeze so > > + * that the device does not send any interrupts until new interrupt > > + * handlers have been established by the next kernel. > > + */ > > + if (vdev->irq_type != VFIO_PCI_NUM_IRQS) { > > + pci_err(pdev, "Freeze failed! Interrupts are still enabled.\n"); > > + return -EINVAL; > > + } > > + > > + ret = pci_load_saved_state(pdev, vdev->pci_saved_state); > > + if (ret) > > + return ret; > > + > > + vfio_pci_core_try_reset(vdev); > > I think a call to pci_clear_master() is needed here to so the device > stops issuing memory transactions while VFIO is trying to resetting > it. That doesn't sound right, reset should always work.. Didn't look beyond this hunk but why is a function called 'freeze' donig a reset anyhow? > Sashiko also wondered if pci_clear_master() is needed to ensure that > the device has bus mastering disabled during the kexec Only devices that are not being preserved.. > think that is actually an issue. vfio_pci_core_enable() makes sure > that vdev->pci_saved_state has bus mastering disabled, so > pci_restore_state() below here should guaranteed it is clear during > kexec. .. and bus mastering should not be disabled on any device expecting to be preserved .. Jason