From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Woodhouse, David" Subject: Re: [PATCH qemu-xen-traditional] xen/pt: allow QEMU to request MSI unmasking at bind time Date: Tue, 31 Jul 2018 10:22:15 +0000 Message-ID: <1533032534.16128.19.camel@amazon.co.uk> References: <1527058885.8186.68.camel@infradead.org> <1529314520-79691-1-git-send-email-andraprs@amazon.com> , <20180618114352.xelerr457ev2e5kj@mac> <1529570276822.28578@amazon.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============7734061385603820055==" Return-path: Received: from all-amaz-eas1.inumbo.com ([34.197.232.57]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1fkRnK-0007Kk-96 for xen-devel@lists.xenproject.org; Tue, 31 Jul 2018 10:22:22 +0000 In-Reply-To: <1529570276822.28578@amazon.com> MIME-Version: 1.0 List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: "roger.pau@citrix.com" , "Paraschiv, Andra-Irina" Cc: "andrew.cooper3@citrix.com" , "sstabellini@kernel.org" , "ian.jackson@eu.citrix.com" , "jbeulich@suse.com" , "xen-devel@lists.xenproject.org" List-Id: xen-devel@lists.xenproject.org --===============7734061385603820055== Content-Language: en-US Content-Type: multipart/signed; micalg=sha-256; protocol="application/x-pkcs7-signature"; boundary="=-YWz4PyoXUWQnj8iv6jCp" --=-YWz4PyoXUWQnj8iv6jCp Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Ian, any objections? Thanks.On Thu, 2018-06-21 at 08:37 +0000, Paraschiv, Andra-Irina wrote: > + Cc: Ian Jackson for review. >=20 > Thanks, Roger, for review and feedback. >=20 > Andra > ________________________________________ > From: Roger Pau Monn=C3=A9 > Sent: Monday, June 18, 2018 2:43 PM > To: Paraschiv, Andra-Irina > Cc: xen-devel@lists.xenproject.org; sstabellini@kernel.org; jbeulich@ > suse.com; andrew.cooper3@citrix.com; Woodhouse, David > Subject: Re: [PATCH qemu-xen-traditional] xen/pt: allow QEMU to > request MSI unmasking at bind time >=20 > On Mon, Jun 18, 2018 at 09:35:20AM +0000, Andra Paraschiv wrote: > >=20 > > When a MSI interrupt is bound to a guest using > > xc_domain_update_msi_irq (XEN_DOMCTL_bind_pt_irq) the interrupt is > > left masked by default. > >=20 > > This causes problems with guests that first configure interrupts > > and > > clean the per-entry MSIX table mask bit and afterwards enable MSIX > > globally. In such scenario the Xen internal msixtbl handlers would > > not > > detect the unmasking of MSIX entries because vectors are not yet > > registered since MSIX is not enabled, and vectors would be left > > masked. > >=20 > > Introduce a new flag in the gflags field to signal Xen whether a > > MSI > > interrupt should be unmasked after being bound. > >=20 > > This also requires to track the mask register for MSI interrupts, > > so > > QEMU can also notify to Xen whether the MSI interrupt should be > > bound > > masked or unmasked > >=20 > > Signed-off-by: Roger Pau Monn=C3=A9 > > Reviewed-by: Jan Beulich > > Reported-by: Andreas Kinzler > > Reviewed-by: Stefano Stabellini > > Signed-off-by: Stefano Stabellini > >=20 > > [Backported from commit a8036336609d2e184fc3543a4c439c0ba7d7f3a2 > > =C2=A0https://git.qemu.org/?p=3Dqemu.git;a=3Dcommit;h=3Da8036336609d2e1= 84fc354 > > 3a4c439c0ba7d7f3a2 > > =C2=A0https://xenbits.xen.org/gitweb/?p=3Dqemu-xen.git;a=3Dcommit;h=3Da= 8036336 > > 609d2e184fc3543a4c439c0ba7d7f3a2] > >=20 > > Signed-off-by: Andra Paraschiv > Thanks for doing the backport, LGTM. >=20 >=20 >=20 > Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. > Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. > Registered in Romania. Registration number J22/2621/2005. >=20 >=20 > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xenproject.org > https://lists.xenproject.org/mailman/listinfo/xen-devel --=-YWz4PyoXUWQnj8iv6jCp Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEE4w ggUuMIIEFqADAgECAhEApEtL31g6H7ROXdOiQnA9RjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTcxMjIxMDAwMDAwWhcNMTgxMjIxMjM1 OTU5WjAiMSAwHgYJKoZIhvcNAQkBFhFkd213QGFtYXpvbi5jby51azCCASIwDQYJKoZIhvcNAQEB BQADggEPADCCAQoCggEBAKdGKgXuwKMg2r+i/4BZZC0ddRxNq3xIKTakie/VCSzoO7P17A36ZzUc 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