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xics-kvm: enable irqfd for MSI 

This enables IRQFD support for sPAPR. The feature decreases the latency
of interrupt handling.

To enable IRQFD for MSI, this sets kvm_gsi_direct_mapping to true which
enables direct MSI mapping.

To enable IRQFD for LSI (level triggered INTx interrupts), a PCI host bus
callback is required. The patch for that is coming next.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexey Kardashevskiy 2013-09-26 16:18:47 +10:00 committed by Alexander Graf
parent 5d87e4b74a
commit 9554233c9b
1 changed files with 6 additions and 0 deletions
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6
hw/intc/xics_kvm.c
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@ -441,6 +441,12 @@ static void xics_kvm_realize(DeviceState *dev, Error **errp)
goto fail;
}
}
kvm_kernel_irqchip = true;
kvm_irqfds_allowed = true;
kvm_msi_via_irqfd_allowed = true;
kvm_gsi_direct_mapping = true;
return;
fail: