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Smith" , Wei Liu , Anthony PERARD , "Juergen Gross" , Stefano Stabellini , CC: Stewart Hildebrand , Alex Deucher , Xenia Ragiadakou , Stefano Stabellini , Huang Rui , Honglei Huang , Julia Zhang , Jiqian Chen , Huang Rui Subject: [RFC XEN PATCH v3 3/3] libxl: Use gsi instead of irq for mapping pirq Date: Mon, 11 Dec 2023 00:40:09 +0800 Message-ID: <20231210164009.1551147-4-Jiqian.Chen@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231210164009.1551147-1-Jiqian.Chen@amd.com> References: <20231210164009.1551147-1-Jiqian.Chen@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF000015C8:EE_|SA0PR12MB4559:EE_ X-MS-Office365-Filtering-Correlation-Id: 66335a6c-1a3c-429b-e1a3-08dbf99ebf35 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(39860400002)(396003)(136003)(376002)(346002)(230922051799003)(451199024)(64100799003)(82310400011)(1800799012)(186009)(46966006)(40470700004)(36840700001)(40460700003)(36860700001)(5660300002)(1076003)(47076005)(336012)(26005)(2616005)(16526019)(36756003)(426003)(70586007)(70206006)(54906003)(40480700001)(2906002)(83380400001)(82740400003)(81166007)(41300700001)(356005)(478600001)(7696005)(86362001)(8676002)(8936002)(4326008)(110136005)(316002)(6666004)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Dec 2023 16:40:41.0560 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 66335a6c-1a3c-429b-e1a3-08dbf99ebf35 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF000015C8.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4559 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1702226471336100001 Content-Type: text/plain; charset="utf-8" In PVH dom0, it uses the linux local interrupt mechanism, when it allocs irq for a gsi, it is dynamic, and follow the principle of applying first, distributing first. And the irq number is alloced from small to large, but the applying gsi number is not, may gsi 38 comes before gsi 28, that causes the irq number is not equal with the gsi number. And when passthrough a device, xl wants to use gsi to map pirq, see pci_add_dm_done->xc_physdev_map_pirq, but the gsi number is got from file /sys/bus/pci/devices//irq in current code, so it will fail when mapping. So, use real gsi number read from gsi sysfs. Co-developed-by: Huang Rui Signed-off-by: Jiqian Chen --- tools/libs/light/libxl_pci.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/tools/libs/light/libxl_pci.c b/tools/libs/light/libxl_pci.c index 96cb4da079..9e75f0c263 100644 --- a/tools/libs/light/libxl_pci.c +++ b/tools/libs/light/libxl_pci.c @@ -1416,7 +1416,7 @@ static void pci_add_dm_done(libxl__egc *egc, char *sysfs_path; FILE *f; unsigned long long start, end, flags, size; - int irq, i; + int gsi, i; int r; uint32_t flag =3D XEN_DOMCTL_DEV_RDM_RELAXED; uint32_t domainid =3D domid; @@ -1439,7 +1439,7 @@ static void pci_add_dm_done(libxl__egc *egc, pci->bus, pci->dev, pci->func); f =3D fopen(sysfs_path, "r"); start =3D end =3D flags =3D size =3D 0; - irq =3D 0; + gsi =3D 0; =20 if (f =3D=3D NULL) { LOGED(ERROR, domainid, "Couldn't open %s", sysfs_path); @@ -1478,26 +1478,26 @@ static void pci_add_dm_done(libxl__egc *egc, fclose(f); if (!pci_supp_legacy_irq()) goto out_no_irq; - sysfs_path =3D GCSPRINTF(SYSFS_PCI_DEV"/"PCI_BDF"/irq", pci->domain, + sysfs_path =3D GCSPRINTF(SYSFS_PCI_DEV"/"PCI_BDF"/gsi", pci->domain, pci->bus, pci->dev, pci->func); f =3D fopen(sysfs_path, "r"); if (f =3D=3D NULL) { LOGED(ERROR, domainid, "Couldn't open %s", sysfs_path); goto out_no_irq; } - if ((fscanf(f, "%u", &irq) =3D=3D 1) && irq) { - r =3D xc_physdev_map_pirq(ctx->xch, domid, irq, &irq); + if ((fscanf(f, "%u", &gsi) =3D=3D 1) && gsi) { + r =3D xc_physdev_map_pirq(ctx->xch, domid, gsi, &gsi); if (r < 0) { - LOGED(ERROR, domainid, "xc_physdev_map_pirq irq=3D%d (error=3D= %d)", - irq, r); + LOGED(ERROR, domainid, "xc_physdev_map_pirq gsi=3D%d (error=3D= %d)", + gsi, r); fclose(f); rc =3D ERROR_FAIL; goto out; } - r =3D xc_domain_irq_permission(ctx->xch, domid, irq, 1); + r =3D xc_domain_irq_permission(ctx->xch, domid, gsi, 1); if (r < 0) { LOGED(ERROR, domainid, - "xc_domain_irq_permission irq=3D%d (error=3D%d)", irq, r= ); + "xc_domain_irq_permission gsi=3D%d (error=3D%d)", gsi, r= ); fclose(f); rc =3D ERROR_FAIL; goto out; --=20 2.34.1