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kconfig: add CONFIG_MSI_NONBROKEN

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Not all interrupt controllers have a working implementation of
message-signalled interrupts; in some cases, the guest may expect
MSI to work but it won't due to the buggy or lacking emulation.

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 <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2019-03-14 14:13:34 +01:00
parent 4f5604c41d
commit ca9b7e29de
6 changed files with 13 additions and 0 deletions
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hw/s390x/Kconfig
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@ -9,3 +9,4 @@ config S390_CCW_VIRTIO
select S390_FLIC
select SCLPCONSOLE
select VIRTIO_CCW
select MSI_NONBROKEN