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 EAssm3Pv 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/24/26 07:57, David Matlack wrote: > Require that Live Update preserved devices are in singleton iommu_groups > during preservation (outgoing kernel) and retrieval (incoming kernel). > > PCI devices preserved across Live Update will be allowed to perform > memory transactions throughout the Live Update. Thus IOMMU groups for > preserved devices must remain fixed. Since all current use cases for > Live Update are for PCI devices in singleton iommu_groups, require that > as a starting point. This avoids the complexity of needing to enforce > arbitrary iommu_group topologies while still allowing all current use > cases. > > Suggested-by: Jason Gunthorpe > Signed-off-by: David Matlack > --- > drivers/pci/liveupdate.c | 34 +++++++++++++++++++++++++++++++++- > 1 file changed, 33 insertions(+), 1 deletion(-) > > diff --git a/drivers/pci/liveupdate.c b/drivers/pci/liveupdate.c > index bec7b3500057..a3dbe06650ff 100644 > --- a/drivers/pci/liveupdate.c > +++ b/drivers/pci/liveupdate.c > @@ -75,6 +75,8 @@ > * > * * The device must not be a Physical Function (PF). > * > + * * The device must be the only device in its IOMMU group. > + * > * Preservation Behavior > * ===================== > * > @@ -105,6 +107,7 @@ > > #include > #include > +#include > #include > #include > #include > @@ -222,6 +225,31 @@ static void pci_ser_delete(struct pci_ser *ser, struct pci_dev *dev) > ser->nr_devices--; > } > > +static int count_devices(struct device *dev, void *__nr_devices) > +{ > + (*(int *)__nr_devices)++; > + return 0; > +} > + there was a related discussion on the singleton group check. have you considered the device_group_immutable_singleton() in below link? https://lore.kernel.org/linux-iommu/20220421052121.3464100-4-baolu.lu@linux.intel.com/ Regards, Yi Liu