From: Alexey Kardashevskiy <aik@ozlabs.ru>
Date: Thu, 26 Sep 2013 06:18:47 +0000 (+1000)
Subject: xics-kvm: enable irqfd for MSI
X-Git-Tag: TizenStudio_2.0_p2.3.2~208^2~1259^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9554233c9b8fe7d94dfa53db09ce3d186f2e8b9e;p=sdk%2Femulator%2Fqemu.git

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>
---

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 **errp)
             goto fail;
         }
     }
+
+    kvm_kernel_irqchip = true;
+    kvm_irqfds_allowed = true;
+    kvm_msi_via_irqfd_allowed = true;
+    kvm_gsi_direct_mapping = true;
+
     return;
 
 fail: