On Sat, Jun 13, 2026 at 11:13:35PM +0530, Pranjal Arya wrote: Hi Pranjal,
> vfio-pci has no perm_bits entry for the PCIe Device Serial Number (DSN) > Extended Capability, so guest reads of the serial > number currently fall through to the physical device. The DSN is a > unique, persistent hardware serial number that identifies the physical > component (the functions of a Multi-Function Device report the same > value; Root Complex integrated Endpoints may implement it independently), > so exposing it lets a guest fingerprint the host hardware and correlate > it across VMs. For multi-tenant passthrough this is an unnecessary > host-identifier leak. > + 1 to what Alex said here, QEMU / VMM should be able to trap and present the desired values here, we shouldn't need this in the vconfig. Thus, I believe this is better suited to QEMU (maybe this should be a patch to QEMU?) > > Signed-off-by: Pranjal Arya <[email protected]> > --- > Pranjal Arya (3): > vfio/pci: Virtualize and scrub Device Serial Number from guests > vfio/pci: Allow userspace to set a virtual Device Serial Number > selftests/vfio: Add PCIe Device Serial Number test > > MAINTAINERS | 6 + > drivers/vfio/pci/vfio_pci_config.c | 98 +++++++++++ > drivers/vfio/pci/vfio_pci_core.c | 2 + > drivers/vfio/pci/vfio_pci_priv.h | 2 + > include/uapi/linux/pci_regs.h | 5 + > include/uapi/linux/vfio.h | 18 ++ > tools/testing/selftests/vfio/Makefile | 1 + > tools/testing/selftests/vfio/vfio_pci_dsn_test.c | 206 > +++++++++++++++++++++++ > 8 files changed, 338 insertions(+) > --- > base-commit: c425609d6ac4012c8bbf01ec2e10e801b1923a7b > change-id: 20260613-pcie_vfio-48506602ec6a A few minor things, we don't use change-id upstream and no need to add a MAINTAINERS entry per test, we already have an entry to maintain tools/testing/selftests/vfio. Thanks, Praan
