From: Manish Honap <[email protected]> Let an admin or a variant driver keep the CXL Type-2 extensions out of the path and drive the device as plain vfio-pci. Add a vfio_pci.disable_cxl module parameter, and let a variant driver set vdev->disable_cxl in its own init callback for per-device control. The parameter is built only when the CXL provider is configured.
Assisted-by: LLM Signed-off-by: Manish Honap <[email protected]> --- drivers/vfio/pci/vfio_pci.c | 13 +++++++++++++ include/linux/vfio_pci_core.h | 1 + 2 files changed, 14 insertions(+) diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index 830369ff878d..66f2e318d8e5 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -60,6 +60,16 @@ static bool disable_denylist; module_param(disable_denylist, bool, 0444); MODULE_PARM_DESC(disable_denylist, "Disable use of device denylist. Disabling the denylist allows binding to devices with known errata that may lead to exploitable stability or security issues when accessed by untrusted users."); +#if IS_ENABLED(CONFIG_VFIO_CXL) +/* + * A variant driver may instead set vdev->disable_cxl in its own init callback + * for per-device control without this module-wide parameter. + */ +static bool disable_cxl; +module_param(disable_cxl, bool, 0644); +MODULE_PARM_DESC(disable_cxl, "Disable CXL Type-2 extensions for all devices bound to vfio-pci."); +#endif + static bool vfio_pci_dev_in_denylist(struct pci_dev *pdev) { switch (pdev->vendor) { @@ -142,6 +152,9 @@ static int vfio_pci_init_dev(struct vfio_device *core_vdev) #ifdef CONFIG_VFIO_PCI_VGA vdev->disable_vga = disable_vga; #endif +#if IS_ENABLED(CONFIG_VFIO_CXL) + vdev->disable_cxl = disable_cxl; +#endif return vfio_pci_core_init_dev(core_vdev); } diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h index 6ebf9a26275e..475a0ecf9e4f 100644 --- a/include/linux/vfio_pci_core.h +++ b/include/linux/vfio_pci_core.h @@ -149,6 +149,7 @@ struct vfio_pci_core_device { bool disable_idle_d3:1; bool nointxmask:1; bool disable_vga:1; + bool disable_cxl:1; /* Flags modified at runtime - dedicated storage unit */ bool needs_reset; bool pm_intx_masked; -- 2.25.1
