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[Qemu-ppc] [PATCH v5 13/14] xics-kvm: enable irqfd for MSI

From: Alexey Kardashevskiy
Subject: [Qemu-ppc] [PATCH v5 13/14] xics-kvm: enable irqfd for MSI
Date: Thu, 26 Sep 2013 16:18:47 +1000

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 <address@hidden>
 hw/intc/xics_kvm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/intc/xics_kvm.c b/hw/intc/xics_kvm.c
index a2ccafa..c203646 100644
--- a/hw/intc/xics_kvm.c
+++ b/hw/intc/xics_kvm.c
@@ -441,6 +441,12 @@ static void xics_kvm_realize(DeviceState *dev, Error 
             goto fail;
+    kvm_kernel_irqchip = true;
+    kvm_irqfds_allowed = true;
+    kvm_msi_via_irqfd_allowed = true;
+    kvm_gsi_direct_mapping = true;

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