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Iglesias" CC: , , Huang Rui , Jiqian Chen , Huang Rui Subject: [QEMU PATCH v8] xen/passthrough: use gsi to map pirq when dom0 is PVH Date: Wed, 16 Oct 2024 14:28:27 +0800 Message-ID: <20241016062827.2301004-1-Jiqian.Chen@amd.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 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: SJ5PEPF00000207:EE_|PH0PR12MB8797:EE_ X-MS-Office365-Filtering-Correlation-Id: 9348a513-3acd-4696-da8e-08dcedabc815 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|376014|82310400026; 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:(13230040)(1800799024)(36860700013)(376014)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Oct 2024 06:28:43.0427 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9348a513-3acd-4696-da8e-08dcedabc815 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: SJ5PEPF00000207.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB8797 In PVH dom0, when passthrough a device to domU, QEMU code xen_pt_realize->xc_physdev_map_pirq wants to use gsi, but in current codes the gsi number is got from file /sys/bus/pci/devices//irq, that is wrong, because irq is not equal with gsi, they are in different spaces, so pirq mapping fails. To solve above problem, use new interface of Xen, xc_pcidev_get_gsi to get gsi and use xc_physdev_map_pirq_gsi to map pirq when dom0 is PVH. Signed-off-by: Jiqian Chen Signed-off-by: Huang Rui Signed-off-by: Jiqian Chen --- Hi All, This is v8 to support passthrough on Xen when dom0 is PVH. v7->v8 change: * Since xc_physdev_gsi_from_dev was renamed to xc_pcidev_get_gsi, changed it. * Added xen_run_qemu_on_hvm to check if Qemu run on PV dom0, if not use xc_physdev_map_pirq_gsi to map pirq. * Used CONFIG_XEN_CTRL_INTERFACE_VERSION to wrap the new part for compatibility. * Added "#define DOMID_RUN_QEMU 0" to represent the id of domain that Qemu run on. Best regards, Jiqian Chen v6->v7 changes: * Because the function of obtaining gsi was changed on the kernel and Xen side. Changed to use xc_physdev_gsi_from_dev, that requires passing in sbdf instead of irq. v5->v6 changes: * Because the function of obtaining gsi was changed on the kernel and Xen side. Changed to use xc_physdev_gsi_from_irq, instead of gsi sysfs. * Since function changed, removed the Review-by of Stefano. v4->v5 changes: * Added Review-by Stefano. v3->v4 changes: * Added gsi into struct XenHostPCIDevice and used gsi number that read from gsi sysfs if it exists, if there is no gsi sysfs, still use irq. v2->v3 changes: * Due to changes in the implementation of the second patch on kernel side(that adds a new sysfs for gsi instead of a new syscall), so read gsi number from the sysfs of gsi. v1 and v2: We can record the relation between gsi and irq, then when userspace(qemu) want to use gsi, we can do a translation. The third patch of kernel(xen/privcmd: Add new syscall to get gsi from irq) records all the relations in acpi_register_gsi_xen_pvh() when dom0 initialize pci devices, and provide a syscall for userspace to get the gsi from irq. The third patch of xen(tools: Add new function to get gsi from irq) add a new function xc_physdev_gsi_from_irq() to call the new syscall added on kernel side. And then userspace can use that function to get gsi. Then xc_physdev_map_pirq() will success. Issues we encountered: 1. failed to map pirq for gsi Problem: qemu will call xc_physdev_map_pirq() to map a passthrough device's gsi to pirq in function xen_pt_realize(). But failed. Reason: According to the implement of xc_physdev_map_pirq(), it needs gsi instead of irq, but qemu pass irq to it and treat irq as gsi, it is got from file /sys/bus/pci/devices/xxxx:xx:xx.x/irq in function xen_host_pci_device_get(). But actually the gsi number is not equal with irq. They are in different space. --- hw/xen/xen_pt.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ hw/xen/xen_pt.h | 1 + 2 files changed, 45 insertions(+) diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c index 3635d1b39f79..7f8139d20915 100644 --- a/hw/xen/xen_pt.c +++ b/hw/xen/xen_pt.c @@ -766,6 +766,41 @@ static void xen_pt_destroy(PCIDevice *d) { } /* init */ +#define PCI_SBDF(seg, bus, dev, func) \ + ((((uint32_t)(seg)) << 16) | \ + (PCI_BUILD_BDF(bus, PCI_DEVFN(dev, func)))) + +#if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 42000 +static bool xen_run_qemu_on_hvm(void) +{ + xc_domaininfo_t info; + + if (!xc_domain_getinfo_single(xen_xc, DOMID_RUN_QEMU, &info) && + (info.flags & XEN_DOMINF_hvm_guest)) { + return true; + } + + return false; +} + +static int xen_map_pirq_for_gsi(PCIDevice *d, int *pirq) +{ + int gsi; + XenPCIPassthroughState *s = XEN_PT_DEVICE(d); + + gsi = xc_pcidev_get_gsi(xen_xc, + PCI_SBDF(s->real_device.domain, + s->real_device.bus, + s->real_device.dev, + s->real_device.func)); + if (gsi >= 0) { + return xc_physdev_map_pirq_gsi(xen_xc, xen_domid, gsi, pirq); + } + + return gsi; +} +#endif + static void xen_pt_realize(PCIDevice *d, Error **errp) { ERRP_GUARD(); @@ -847,7 +882,16 @@ static void xen_pt_realize(PCIDevice *d, Error **errp) goto out; } +#if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 42000 + if (xen_run_qemu_on_hvm()) { + rc = xen_map_pirq_for_gsi(d, &pirq); + } else { + rc = xc_physdev_map_pirq(xen_xc, xen_domid, machine_irq, &pirq); + } +#else rc = xc_physdev_map_pirq(xen_xc, xen_domid, machine_irq, &pirq); +#endif + if (rc < 0) { XEN_PT_ERR(d, "Mapping machine irq %u to pirq %i failed, (err: %d)\n", machine_irq, pirq, errno); diff --git a/hw/xen/xen_pt.h b/hw/xen/xen_pt.h index 095a0f0365d4..a08b45b7fbae 100644 --- a/hw/xen/xen_pt.h +++ b/hw/xen/xen_pt.h @@ -36,6 +36,7 @@ void xen_pt_log(const PCIDevice *d, const char *f, ...) G_GNUC_PRINTF(2, 3); # define XEN_PT_LOG_CONFIG(d, addr, val, len) #endif +#define DOMID_RUN_QEMU 0 /* Helper */ #define XEN_PFN(x) ((x) >> XC_PAGE_SHIFT)