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spf=pass smtp.mailfrom=citrix.com; dmarc=pass action=none header.from=citrix.com; dkim=pass header.d=citrix.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=citrix.onmicrosoft.com; s=selector2-citrix-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=DFvWd/zDJt973ue1xatUuG3pwJ3lvWSkD+oWWiLPwAQ=; b=q7ERQVKOwaa8XgY0QkQ2xC0U66QkswyyBheubJgWdeXoIbAQczB5w/jwkFoeRukmxcn+WhAhC1CaJl3hmxvFWjZ/Z3ng4pMZ/oQO/6+dlEu+TBeC/g8W1qhgrzXKPZepEq9rctsCYTPpwcsbEXjk4KWLVugQAsPfF8iODZABOBg= From: Roger Pau Monne To: CC: Roger Pau Monne , Jan Beulich , Andrew Cooper , Wei Liu Subject: [PATCH v2 2/4] x86/vioapic: issue EOI to dpci when switching pin to edge trigger mode Date: Fri, 15 Jan 2021 15:28:18 +0100 Message-ID: <20210115142820.35224-3-roger.pau@citrix.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210115142820.35224-1-roger.pau@citrix.com> References: <20210115142820.35224-1-roger.pau@citrix.com> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?aFpMVWxoVVdDYktCWmlCSjkyWTZSQUI2bmRMTmdPQXVueTJlQ25ZZ1NROUlp?= =?utf-8?B?bFRteU9ZQVFrVnJJTHMvMEdkWW55ZHVpOENxOVZhc0pXbmNvUUZ2SDhxaFNs?= =?utf-8?B?QXFjWTFybXpvU1ZBVUpHQUdhS3hFV1JaUXVRaFNVWGMwVUNiSURENFBXbXIw?= =?utf-8?B?REpFN1dPZmpHWEp3b0ZHL21yc0dVNnFCQ1pRdm8ycnlOUGxQbEZySGxJdHBj?= =?utf-8?B?dnNjaXhyNEI4VW1xdk40T0Jqek5EMHl5ZjhyT3lGbEQ5TlRsb0tUTkhjSUdC?= =?utf-8?B?MWsrZlR1OHZaSVVTSkZzbTZsKzl2MzJvM28rdEM1RXFraWpMWm54Z09vNDhO?= =?utf-8?B?ZGtQWXRKc0U0aVBEZXVMRFhhMkgzaEtjbzJseU9HNVBhWmprNkFWV2tTNWg3?= =?utf-8?B?ZWxLSzZRVDJ0bXloTnR0N0pQVWc2R3JkOGFvZFhXVkxiSHlhSCtqeVEwQ09N?= =?utf-8?B?eFFVd2xMOTFSQ3VKZEhsd20vZDZ6KytHNmFueHRCRDlhazhHeGdKeEZkK0hN?= =?utf-8?B?YmJKTmVScXl6TEhBeURMZHF2VTE5YVQ5b0dCWk9uZElYTTdsWWxTMDBTU2xx?= =?utf-8?B?RE1UaXJiQzRpSEN6b1pOb1pVQkkrbDhUU21iNFZKQmg0NTJBV2pxVGxJZ2l6?= =?utf-8?B?UmRTcFRZOVhzSG5jSEVFL21peDdIbGJ2QlZCS0I4c3RZNjhvUHUvT0FFblRJ?= =?utf-8?B?Z2ZkSkdHbUNpWU5qVm1HOU5jVTVYQ3JPbU1LU25IRFlQY3ZBZm1NN29PcE0z?= =?utf-8?B?VDliaFkzVjJwakw5VDZoTlBjVW9mREpKSjVVY1FOdnhiTzVGYUNIazhJWFNT?= =?utf-8?B?bFd6d28yUXVPalF2WXdKZkJtVHJLaVVMdkxXRndiSzVGTEcwTkpaRHJINkFN?= =?utf-8?B?VXdMUEVzV0NpaDZLVEgvWEYwd0VTY1B4UG5XclJlQ3FlZUQyeDNLL1BmbHcv?= =?utf-8?B?a3E5RnZtaWtFelJkcExhcTBCTGkrSmp1d2ZwUlE2WWZFbW41UndobHZKdFIw?= =?utf-8?B?MXNuVDd3aGQxbFpObTVwSW4vOWh6WFRHNkFTcG5WcjR5QXJDcllSSVRtN0hP?= =?utf-8?B?b2Q1UmRMZW1tNVBtclV4eW5BZXRtNFNWUUVhb0h0VWZHcGtMMlRrbW96NFRT?= =?utf-8?B?OHArTURvR0xsOXNGRTdRREs5VFVRTUdFMlRIVnp6RGEzLzVpWW52T2pzOXky?= =?utf-8?B?Mnptang4ekRtM0dYVURQbWpyenA2Y3NZb1FnTnA2b0hNV0N3YlJzT09uOEVW?= =?utf-8?B?QlQxMzRaV1J3QlNXRXBQRnZPNldqanN4VFg4czBGMThQWWQwVHhZbENjSWh4?= =?utf-8?Q?FRCVRwSQmHxX6mfnJiHGxgGxjURnJEa1SF?= X-MS-Exchange-CrossTenant-Network-Message-Id: 6747a5f3-f25f-4563-b807-08d8b961e83b X-MS-Exchange-CrossTenant-AuthSource: DS7PR03MB5608.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jan 2021 14:29:03.4040 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 335836de-42ef-43a2-b145-348c2ee9ca5b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: UxBO/wUCP374mae3Dge/e/+PEc8Ww5T0O5Z6xeLB0yjXR5hORO4/cRZJr/s0PtYC9SppdmjX98byeLeXcjRD7Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR03MB3147 X-OriginatorOrg: citrix.com X-ZohoMail-DKIM: pass (identity @citrix.com) When an IO-APIC pin is switched from level to edge trigger mode the IRR bit is cleared, so it can be used as a way to EOI an interrupt at the IO-APIC level. Such EOI however does not get forwarded to the dpci code like it's done for the local APIC initiated EOI. This change adds the code in order to notify dpci of such EOI, so that dpci and the interrupt controller are in sync. Signed-off-by: Roger Pau Monn=C3=A9 --- xen/arch/x86/hvm/vioapic.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/xen/arch/x86/hvm/vioapic.c b/xen/arch/x86/hvm/vioapic.c index 804bc77279..dc35347afa 100644 --- a/xen/arch/x86/hvm/vioapic.c +++ b/xen/arch/x86/hvm/vioapic.c @@ -268,6 +268,17 @@ static void vioapic_write_redirent( =20 spin_unlock(&d->arch.hvm.irq_lock); =20 + if ( ent.fields.trig_mode =3D=3D VIOAPIC_EDGE_TRIG && + ent.fields.remote_irr && is_iommu_enabled(d) ) + /* + * Since IRR has been cleared and further interrupts can be + * injected also attempt to deassert any virtual line of passed + * through devices using this pin. Switching a pin from level = to + * trigger mode can be used as a way to EOI an interrupt at the + * IO-APIC level. + */ + hvm_dpci_eoi(d, gsi); + if ( is_hardware_domain(d) && unmasked ) { /* --=20 2.29.2