[Qemu-devel] [PATCH 1/2] kconfig: add CONFIG_MSI

[Paolo Bonzini]

Not all interrupt controllers support message-signalled interrupts,
and some devices *only* support message-signalled interrupts.

In QEMU this is represented by the "msi_nonbroken" variable.  This
patch adds a new configuration symbol enabled whenever the binary
contains an interrupt controller that will set "msi_nonbroken".  We
can then use it to remove devices that cannot be possibly added
to the machine, because they require MSI.

Signed-off-by: Paolo Bonzini <address@hidden>
---
 hw/intc/Kconfig     | 3 +++
 hw/pci-host/Kconfig | 1 +
 hw/pci/Kconfig      | 4 ++++
 hw/ppc/Kconfig      | 1 +
 hw/s390x/Kconfig    | 1 +
 5 files changed, 10 insertions(+)

diff --git a/hw/intc/Kconfig b/hw/intc/Kconfig
index de10a6bcbf..e78b5db3be 100644
--- a/hw/intc/Kconfig
+++ b/hw/intc/Kconfig
@@ -12,12 +12,15 @@ config IOAPIC
 
 config ARM_GIC
     bool
+    select MSI
 
 config OPENPIC
     bool
+    select MSI
 
 config APIC
     bool
+    select MSI
 
 config ARM_GIC_KVM
     bool
diff --git a/hw/pci-host/Kconfig b/hw/pci-host/Kconfig
index b39ea297ba..58c99f55fa 100644
--- a/hw/pci-host/Kconfig
+++ b/hw/pci-host/Kconfig
@@ -49,3 +49,4 @@ config PCI_EXPRESS_XILINX
 config PCI_EXPRESS_DESIGNWARE
     bool
     select PCI_EXPRESS
+    select MSI
diff --git a/hw/pci/Kconfig b/hw/pci/Kconfig
index 3b8638b51d..574b5d4a4a 100644
--- a/hw/pci/Kconfig
+++ b/hw/pci/Kconfig
@@ -7,3 +7,7 @@ config PCI_EXPRESS
 
 config PCI_DEVICES
     bool
+
+config MSI
+    # selected by interrupt controllers that support MSI
+    bool
diff --git a/hw/ppc/Kconfig b/hw/ppc/Kconfig
index 2b83637511..c14f7ea4fe 100644
--- a/hw/ppc/Kconfig
+++ b/hw/ppc/Kconfig
@@ -8,6 +8,7 @@ config PSERIES
     select VFIO if LINUX   # needed by spapr_pci_vfio.c
     select XICS_SPAPR
     select XIVE_SPAPR
+    select MSI
 
 config SPAPR_RNG
     bool
diff --git a/hw/s390x/Kconfig b/hw/s390x/Kconfig
index a7046ea41f..ac0f335584 100644
--- a/hw/s390x/Kconfig
+++ b/hw/s390x/Kconfig
@@ -9,3 +9,4 @@ config S390_CCW_VIRTIO
     select S390_FLIC
     select SCLPCONSOLE
     select VIRTIO_CCW
+    select MSI
-- 
2.20.1