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Zenghui reports that since1396e89e09("genirq/msi: Move prepare() call to per-device allocation"), his Multi-MSI capable device isn't working anymore. This is a consequence of15c72f824b("PCI/MSI: Add support for per device MSI[X] domains"), which always creates a MSI domain of size 1, even in the presence of Multi-MSI. While this was somehow working until then, moving the .prepare() call ends up sizing the ITS table with a tiny value for this device, and making the endpoint driver unhappy. Instead, always create the domain and call the .prepare() helper with the maximum expected size. Fixes:1396e89e09("genirq/msi: Move prepare() call to per-device allocation") Fixes:15c72f824b("PCI/MSI: Add support for per device MSI[X] domains") Reported-by: Zenghui Yu <yuzenghui@huawei.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Zenghui Yu <yuzenghui@huawei.com> Reviewed-by: Lorenzo Pieralisi <lpieralisi@kernel.org> Link: https://lore.kernel.org/all/20250603141801.915305-1-maz@kernel.org Closes: https://lore.kernel.org/r/0b1d7aec-1eac-a9cd-502a-339e216e08a1@huawei.com