From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: xen vtd : set msi guest_masked 0 by default Date: Mon, 21 May 2018 12:46:19 +0100 Message-ID: <1526903179.8186.43.camel@infradead.org> References: <1453772092-24866-1-git-send-email-changjzh@gmail.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============7452596768033763587==" Return-path: In-Reply-To: <1453772092-24866-1-git-send-email-changjzh@gmail.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: "Jianzhong,Chang" , keir@xen.org, jbeulich@suse.com, andrew.cooper3@citrix.com, xen-devel@lists.xen.org Cc: Andra-Irina Paraschiv List-Id: xen-devel@lists.xenproject.org --===============7452596768033763587== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-qqcxRpd5az5ar3ij5oYi" --=-qqcxRpd5az5ar3ij5oYi Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2016-01-26 at 09:34 +0800, Jianzhong,Chang wrote: > There are some problems when msi guest_masked is set to 1 by default. > When guest os is windows 2008 r2 server, > the device(eg X540-AT2 vf) is not initialized correctly. > Host will always receive message like this :"VF Reset msg received from v= f". > Guest has network connectivity issues, > and can not correctly receive/send the packet. In other words "the guest doesn't get any interrupts from the NIC". > So, guest_masked is set to 0 by default. This seems consistent with the PCI spec, which says that "After reset, the state of all implemented Mask and Pending bits is 0 (no vectors are masked and no messages are pending)." That's what we *used* to have in Xen, before these commits changed it to assume that IRQs were guest-masked by default: https://xenbits.xen.org/gitweb/?p=3Dxen.git;a=3Dcommitdiff;h=3Dad28e42bd1d2= 8d746988ed71654e8aa670629753 https://xenbits.xen.org/gitweb/?p=3Dxen.git;a=3Dcommitdiff;h=3D84d6add5593d= 865736831d150da7c38588f669f6 > --- a/xen/arch/x86/msi.c > +++ b/xen/arch/x86/msi.c > @@ -512,7 +512,7 @@ void guest_mask_msi_irq(struct irq_desc *desc, bool_t= mask) > =C2=A0 > =C2=A0static unsigned int startup_msi_irq(struct irq_desc *desc) > =C2=A0{ > -=C2=A0=C2=A0=C2=A0=C2=A0if ( unlikely(!msi_set_mask_bit(desc, 0, !!(desc= ->status & IRQ_GUEST))) ) > +=C2=A0=C2=A0=C2=A0=C2=A0if ( unlikely(!msi_set_mask_bit(desc, 0, 0) )) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0WARN(); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0return 0; > =C2=A0} In testing, this part actually seems to make the difference in practice. Interrupts now work, and Windows guests have connectivity again. > @@ -972,7 +972,7 @@ static int msix_capability_init(struct pci_dev *dev, > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0entry->msi_attrib.e= ntry_nr =3D msi->entry_nr; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0entry->msi_attrib.m= askbit =3D 1; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0entry->msi_attrib.h= ost_masked =3D 1; > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0entry->msi_attrib.guest_= masked =3D 1; > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0entry->msi_attrib.guest_= masked =3D 0; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0entry->msi_attrib.p= os =3D pos; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0entry->irq =3D msi-= >irq; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0entry->dev =3D dev; That also seems correct though, since it reflects the actual state we intend to emulate. --=-qqcxRpd5az5ar3ij5oYi Content-Type: 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