On Thu, 17 Jul 2025 11:10:54 +0200 Krzysztof Kozlowski krzysztof.kozlowski@linaro.org wrote:

VFIO_CDX driver uses msi_domain_alloc_irqs() which is provided by non-user-visible GENERIC_MSI_IRQ, thus it should select that option directly.

VFIO_CDX depends on CDX_BUS, which also will select GENERIC_MSI_IRQ (separate fix), nevertheless driver should poll what is being used there instead of relying on bus Kconfig.

This seems like a recipe for an explosion of Kconfig noise. If the bus fundamentally depends on a config option, as proposed in the separate fix, I don't see that a driver dependent on that bus needs to duplicate the config selections. IMO this is sufficiently fixed updating drivers/cdx/{Kconfig,Makefile}. Thanks,

Alex

Without the fix on CDX_BUS compile test fails:

drivers/vfio/cdx/intr.c: In function ‘vfio_cdx_msi_enable’: drivers/vfio/cdx/intr.c:41:15: error: implicit declaration of function ‘msi_domain_alloc_irqs’; did you mean ‘irq_domain_alloc_irqs’? [-Wimplicit-function-declaration]

Reported-by: Randy Dunlap rdunlap@infradead.org Closes: https://lore.kernel.org/r/4a6fd102-f8e0-42f3-b789-6e3340897032@infradead.org... Fixes: 848e447e000c ("vfio/cdx: add interrupt support") Cc: stable@vger.kernel.org Signed-off-by: Krzysztof Kozlowski krzysztof.kozlowski@linaro.org

---

drivers/vfio/cdx/Kconfig | 1 + 1 file changed, 1 insertion(+)

diff --git a/drivers/vfio/cdx/Kconfig b/drivers/vfio/cdx/Kconfig index e6de0a0caa32..90cf3dee5dba 100644 --- a/drivers/vfio/cdx/Kconfig +++ b/drivers/vfio/cdx/Kconfig @@ -9,6 +9,7 @@ config VFIO_CDX tristate "VFIO support for CDX bus devices" depends on CDX_BUS select EVENTFD

• select GENERIC_MSI_IRQ help Driver to enable VFIO support for the devices on CDX bus. This is required to make use of CDX devices present in