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Re: [Qemu-devel] [PATCH v5 08/10] hw/intc/arm_gic_kvm: advertise irqfd


From: Alexander Graf
Subject: Re: [Qemu-devel] [PATCH v5 08/10] hw/intc/arm_gic_kvm: advertise irqfd
Date: Mon, 11 Aug 2014 14:05:41 +0200
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:31.0) Gecko/20100101 Thunderbird/31.0


On 11.08.14 14:04, Eric Auger wrote:
On 08/11/2014 11:37 AM, Alexander Graf wrote:
On 09.08.14 16:25, Eric Auger wrote:
set kvm_irqfds_allowed

Signed-off-by: Eric Auger <address@hidden>
---
   hw/intc/arm_gic_kvm.c | 2 ++
   1 file changed, 2 insertions(+)

diff --git a/hw/intc/arm_gic_kvm.c b/hw/intc/arm_gic_kvm.c
index 5038885..08b7bf9 100644
--- a/hw/intc/arm_gic_kvm.c
+++ b/hw/intc/arm_gic_kvm.c
@@ -576,6 +576,8 @@ static void kvm_arm_gic_realize(DeviceState *dev,
Error **errp)
                               KVM_DEV_ARM_VGIC_GRP_ADDR,
                               KVM_VGIC_V2_ADDR_TYPE_CPU,
                               s->dev_fd);
+
+    kvm_irqfds_allowed = true;
Is this always true? If it is, why not enable it separately while making
vhost-net work for example?
Hi Alex,

yes I think so. As soon as KVM is enabled, KVM/arm would enable
injection though irqfd. Defintively makes sense to test it with
vhost-net too. Well a matter of priority ;-)

More a matter of accuracy. What if you use new QEMU on old KVM which does have in-kernel GIC support, but no irqfd support?


Alex




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