From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33137) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VZovW-0003o3-5N for qemu-devel@nongnu.org; Fri, 25 Oct 2013 17:28:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VZovJ-0002aF-K3 for qemu-devel@nongnu.org; Fri, 25 Oct 2013 17:28:14 -0400 From: Alexander Graf Date: Fri, 25 Oct 2013 23:27:46 +0200 Message-Id: <1382736474-32128-22-git-send-email-agraf@suse.de> In-Reply-To: <1382736474-32128-1-git-send-email-agraf@suse.de> References: <1382736474-32128-1-git-send-email-agraf@suse.de> Subject: [Qemu-devel] [PULL 21/29] xics-kvm: enable irqfd for MSI List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: QEMU Developers Cc: Blue Swirl , Alexey Kardashevskiy , "qemu-ppc@nongnu.org list:PowerPC" , Anthony Liguori , Aurelien Jarno From: Alexey Kardashevskiy 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 Signed-off-by: Alexander Graf --- 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 **errp) goto fail; } } + + kvm_kernel_irqchip = true; + kvm_irqfds_allowed = true; + kvm_msi_via_irqfd_allowed = true; + kvm_gsi_direct_mapping = true; + return; fail: -- 1.8.1.4