From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dante Cinco Subject: Re: PCI pass-through / MSI question: Is 30(hex) the lower limit for pirq? Date: Fri, 28 May 2010 13:51:01 -0700 Message-ID: <4C002CB5.5090102@gmail.com> References: <4BFF8D4002000078000046F0@vpn.id2.novell.com> <20100528085003.GZ17817@reaktio.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <20100528085003.GZ17817@reaktio.net> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: =?ISO-8859-1?Q?Pasi_K=E4rkk=E4inen?= Cc: Xen-devel , Jan Beulich List-Id: xen-devel@lists.xenproject.org Pasi, Jan, Thank for your help. Adding the extra_guest_irqs Xen boot option=20 resolved the issue I was having with the 8G QLogic card in the Windows=20 domU. Each of the 2 QLogic devices requires 32 IRQs when MSI-X is=20 enabled so I set the value to 80 (16 extra). Dante On 5/28/2010 1:50 AM, Pasi K=E4rkk=E4inen wrote: > On Fri, May 28, 2010 at 08:30:40AM +0100, Jan Beulich wrote: > =20 >>>>> On 28.05.10 at 01:29, Dante Cinco wrote: >>>>> =20 >>> I'm trying to bring up a Windows domU with PCI pass-through and it lo= oks >>> like Xen is running out of pirqs (see log below). I'm using Xen 4.0.0= and >>> dom0 2.6.32.12 pv-ops and pci-stub to hide the PCIe device. >>> >>> It looks like the first available pirq is 4e(hex) and the last availa= ble is >>> 30(hex) and after that, Xen returns an msix error. What's the consequ= ence of >>> running out of pirqs? >>> =20 >> Did you try the extra_guest_irqs=3D Xen command line option to >> increase the number of PIRQs (defaulting to 32) for the guest? >> >> =20 > I added this xen.gz option to: > http://wiki.xensource.com/xenwiki/XenHypervisorBootOptions > > -- Pasi > > =20