{"id":2226035,"url":"http://patchwork.ozlabs.org/api/patches/2226035/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260422023239.1171963-5-mrathor@linux.microsoft.com/","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/projects/28/?format=json","name":"Linux PCI development","link_name":"linux-pci","list_id":"linux-pci.vger.kernel.org","list_email":"linux-pci@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260422023239.1171963-5-mrathor@linux.microsoft.com>","list_archive_url":null,"date":"2026-04-22T02:32:30","name":"[V1,04/13] mshv: Provide a way to get partition id if running in a VMM process","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"dbaa705678d8c52de7ee7a0aebc8fd0b04221633","submitter":{"id":91512,"url":"http://patchwork.ozlabs.org/api/people/91512/?format=json","name":"Mukesh R","email":"mrathor@linux.microsoft.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260422023239.1171963-5-mrathor@linux.microsoft.com/mbox/","series":[{"id":500915,"url":"http://patchwork.ozlabs.org/api/series/500915/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/list/?series=500915","date":"2026-04-22T02:32:26","name":"PCI passthru on Hyper-V (Part I)","version":1,"mbox":"http://patchwork.ozlabs.org/series/500915/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2226035/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2226035/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=linux.microsoft.com header.i=@linux.microsoft.com\n header.a=rsa-sha256 header.s=default header.b=s+NK51tP;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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Guests are actually managed by MSHV driver and the partition id\nis only maintained there. Add a field in the partition struct in MSHV\ndriver to save the tgid of the VMM process creating the partition,\nand add a function there to retrieve partition id if current process\nis a VMM process.\n\nSigned-off-by: Mukesh R \n---\n drivers/hv/mshv_root.h | 1 +\n drivers/hv/mshv_root_main.c | 22 ++++++++++++++++++++++\n include/asm-generic/mshyperv.h | 5 +++++\n 3 files changed, 28 insertions(+)","diff":"diff --git a/drivers/hv/mshv_root.h b/drivers/hv/mshv_root.h\nindex 1f086dcb7aa1..a85c24dcc701 100644\n--- a/drivers/hv/mshv_root.h\n+++ b/drivers/hv/mshv_root.h\n@@ -138,6 +138,7 @@ struct mshv_partition {\n \n \tstruct mshv_girq_routing_table __rcu *pt_girq_tbl;\n \tu64 isolation_type;\n+\tpid_t pt_vmm_tgid;\n \tbool import_completed;\n \tbool pt_initialized;\n #if IS_ENABLED(CONFIG_DEBUG_FS)\ndiff --git a/drivers/hv/mshv_root_main.c b/drivers/hv/mshv_root_main.c\nindex bd1359eb58dd..02c107458be9 100644\n--- a/drivers/hv/mshv_root_main.c\n+++ b/drivers/hv/mshv_root_main.c\n@@ -1908,6 +1908,27 @@ mshv_partition_release(struct inode *inode, struct file *filp)\n \treturn 0;\n }\n \n+/* Given a process tgid, return partition id if it is a VMM process */\n+u64 mshv_current_partid(void)\n+{\n+\tstruct mshv_partition *pt;\n+\tint i;\n+\tu64 ret_ptid = HV_PARTITION_ID_INVALID;\n+\n+\trcu_read_lock();\n+\n+\thash_for_each_rcu(mshv_root.pt_htable, i, pt, pt_hnode) {\n+\t\tif (pt->pt_vmm_tgid == current->tgid) {\n+\t\t\tret_ptid = pt->pt_id;\n+\t\t\tbreak;\n+\t\t}\n+\t}\n+\n+\trcu_read_unlock();\n+\treturn ret_ptid;\n+}\n+EXPORT_SYMBOL_GPL(mshv_current_partid);\n+\n static int\n add_partition(struct mshv_partition *partition)\n {\n@@ -2073,6 +2094,7 @@ mshv_ioctl_create_partition(void __user *user_arg, struct device *module_dev)\n \t\tgoto cleanup_irq_srcu;\n \n \tpartition->pt_id = pt_id;\n+\tpartition->pt_vmm_tgid = current->tgid;\n \n \tret = add_partition(partition);\n \tif (ret)\ndiff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h\nindex bf601d67cecb..e8cbc4e3f7ad 100644\n--- a/include/asm-generic/mshyperv.h\n+++ b/include/asm-generic/mshyperv.h\n@@ -350,6 +350,7 @@ int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);\n int hv_call_notify_all_processors_started(void);\n bool hv_lp_exists(u32 lp_index);\n int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);\n+u64 mshv_current_partid(void);\n \n #else /* CONFIG_MSHV_ROOT */\n static inline bool hv_root_partition(void) { return false; }\n@@ -380,6 +381,10 @@ static inline int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u3\n {\n \treturn -EOPNOTSUPP;\n }\n+static inline u64 mshv_current_partid(void)\n+{\n+\treturn HV_PARTITION_ID_INVALID;\n+}\n #endif /* CONFIG_MSHV_ROOT */\n \n static inline int hv_deposit_memory(u64 partition_id, u64 status)\n","prefixes":["V1","04/13"]}