diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 22da9bfd8a45..bacf8d988f65 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -441,6 +441,11 @@ void __init xen_msi_init(void)
 
 	x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
 	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
+	/*
+	 * With XEN PIRQ/Eventchannels in use PCI/MSI[-X] masking is solely
+	 * controlled by the hypervisor.
+	 */
+	pci_msi_ignore_mask = 1;
 }
 #endif