From patchwork Mon Jan 29 08:33:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi-De Wu X-Patchwork-Id: 13535211 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 39C465813B; Mon, 29 Jan 2024 08:33:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=210.61.82.184 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706517204; cv=none; b=HAxZt8TThybHQLvjZyrW2beM/K/3eM0D8HRwBWrGYQIw/J2kI8s9RTvMHV/8jDSq0hRkclWtk3USEXTcE9xdqNM1BqyyFc8GckIAXxu3LWoeW8+nWSMkGrOzHMcu3p+1/47FRa23J6dM62YPLNYwNC8HmAmncDLRrDm1sOagi/M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706517204; c=relaxed/simple; bh=3dioaQQofEhsS7KTsT+rGyR1qA6uyIkdniyOWFMgmlE=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=NQ89tC6tmjW2kTeVG9Py0X9KuN578zSLe4ZLqG4J7dZk7keAU046bnygtImfiDrC//aSs5jYOLbWYNjwQ/CKvtjaEMsdMa+v1zR2xPVlpRq3qIwkg2KMBFV3QzVKXabU57+jXoDRTm3ah36ShUVAY2o0XioWwMJIcoTB/wZWbRU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com; spf=pass smtp.mailfrom=mediatek.com; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b=BPaBX+dN; arc=none smtp.client-ip=210.61.82.184 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mediatek.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="BPaBX+dN" X-UUID: 084177d2be8111eea2298b7352fd921d-20240129 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=nMw2rY0id1kLvdBTzaUucT+yGeT5AxQk5Fa2HF2/eSo=; b=BPaBX+dNfhnLhYXVxpJpZCXaczq8eS4YczpaFSi0DxgtDbSvnaMjiwBxReLnAYtGX80UegrBDukcLskhhO1oigHLO6A4oUS8n1pZVi9e8e/MHiDxzJU4cu+Yum1BayoP82+NWNG5Mc+DYk4DCBqcByxsN3MCzpmagjTjaMRFsgc=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.36,REQID:dbe2aaa8-894f-4fe9-b97f-924b73662cf4,IP:0,U RL:0,TC:0,Content:-25,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:-25 X-CID-META: VersionHash:6e16cf4,CLOUDID:db25c58e-e2c0-40b0-a8fe-7c7e47299109,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:11|1,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES :1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0 X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_ULN X-UUID: 084177d2be8111eea2298b7352fd921d-20240129 Received: from mtkmbs13n2.mediatek.inc [(172.21.101.108)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 988928144; Mon, 29 Jan 2024 16:33:09 +0800 Received: from mtkmbs13n1.mediatek.inc (172.21.101.193) by mtkmbs13n1.mediatek.inc (172.21.101.193) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Mon, 29 Jan 2024 16:33:09 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs13n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Mon, 29 Jan 2024 16:33:09 +0800 From: Yi-De Wu To: Yingshiuan Pan , Ze-Yu Wang , Yi-De Wu , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Corbet , Catalin Marinas , Will Deacon , Richard Cochran , Matthias Brugger , AngeloGioacchino Del Regno CC: , , , , , , David Bradil , Trilok Soni , My Chuang , Shawn Hsiao , PeiLun Suei , Liju Chen , Willix Yeh , Kevenny Hsieh Subject: [PATCH v9 19/21] virt: geniezone: Provide individual VM memory statistics within debugfs Date: Mon, 29 Jan 2024 16:33:00 +0800 Message-ID: <20240129083302.26044-20-yi-de.wu@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20240129083302.26044-1-yi-de.wu@mediatek.com> References: <20240129083302.26044-1-yi-de.wu@mediatek.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MTK: N From: "Jerry Wang" Created a dedicated per-VM debugfs folder under gzvm, providing user-level programs with easy access to per-VM memory statistics for debugging and profiling purposes. This enables users to effectively analyze and optimize the memory usage of individual virtual machines. Two types of information can be obtained: `cat /sys/kernel/debug/gzvm/-/protected_hyp_mem` shows memory used by the hypervisor and the size of the stage 2 table in bytes. `cat /sys/kernel/debug/gzvm/-/protected_shared_mem` gives memory used by the shared resources of the guest and host in bytes. For example: console:/ # cat /sys/kernel/debug/gzvm/3417-15/protected_hyp_mem 180328 console:/ # cat /sys/kernel/debug/gzvm/3417-15/protected_shared_mem 262144 console:/ # More stats will be added in the future. Signed-off-by: Jerry Wang Signed-off-by: Liju-Clr Chen Signed-off-by: Yi-De Wu --- arch/arm64/geniezone/gzvm_arch_common.h | 2 + arch/arm64/geniezone/vm.c | 13 +++ drivers/virt/geniezone/gzvm_main.c | 6 ++ drivers/virt/geniezone/gzvm_vm.c | 137 ++++++++++++++++++++++++ include/linux/gzvm_drv.h | 15 +++ 5 files changed, 173 insertions(+) diff --git a/arch/arm64/geniezone/gzvm_arch_common.h b/arch/arm64/geniezone/gzvm_arch_common.h index 07c5e2df7a74..fbaf2da792a4 100644 --- a/arch/arm64/geniezone/gzvm_arch_common.h +++ b/arch/arm64/geniezone/gzvm_arch_common.h @@ -26,6 +26,7 @@ enum { GZVM_FUNC_SET_DTB_CONFIG = 16, GZVM_FUNC_MAP_GUEST = 17, GZVM_FUNC_MAP_GUEST_BLOCK = 18, + GZVM_FUNC_GET_STATISTICS = 19, NR_GZVM_FUNC, }; @@ -52,6 +53,7 @@ enum { #define MT_HVC_GZVM_SET_DTB_CONFIG GZVM_HCALL_ID(GZVM_FUNC_SET_DTB_CONFIG) #define MT_HVC_GZVM_MAP_GUEST GZVM_HCALL_ID(GZVM_FUNC_MAP_GUEST) #define MT_HVC_GZVM_MAP_GUEST_BLOCK GZVM_HCALL_ID(GZVM_FUNC_MAP_GUEST_BLOCK) +#define MT_HVC_GZVM_GET_STATISTICS GZVM_HCALL_ID(GZVM_FUNC_GET_STATISTICS) #define GIC_V3_NR_LRS 16 diff --git a/arch/arm64/geniezone/vm.c b/arch/arm64/geniezone/vm.c index 691e6521cc48..571326e70d98 100644 --- a/arch/arm64/geniezone/vm.c +++ b/arch/arm64/geniezone/vm.c @@ -412,3 +412,16 @@ int gzvm_arch_map_guest_block(u16 vm_id, int memslot_id, u64 gfn, u64 nr_pages) return gzvm_hypcall_wrapper(MT_HVC_GZVM_MAP_GUEST_BLOCK, vm_id, memslot_id, gfn, nr_pages, 0, 0, 0, &res); } + +int gzvm_arch_get_statistics(struct gzvm *gzvm) +{ + struct arm_smccc_res res; + int ret; + + ret = gzvm_hypcall_wrapper(MT_HVC_GZVM_GET_STATISTICS, gzvm->vm_id, + 0, 0, 0, 0, 0, 0, &res); + + gzvm->stat.protected_hyp_mem = ((ret == 0) ? res.a1 : 0); + gzvm->stat.protected_shared_mem = ((ret == 0) ? res.a2 : 0); + return ret; +} diff --git a/drivers/virt/geniezone/gzvm_main.c b/drivers/virt/geniezone/gzvm_main.c index af5ab8949206..da1c0f478b61 100644 --- a/drivers/virt/geniezone/gzvm_main.c +++ b/drivers/virt/geniezone/gzvm_main.c @@ -113,6 +113,11 @@ static int gzvm_drv_probe(struct platform_device *pdev) ret = gzvm_drv_irqfd_init(); if (ret) return ret; + + ret = gzvm_drv_debug_init(); + if (ret) + return ret; + return 0; } @@ -121,6 +126,7 @@ static int gzvm_drv_remove(struct platform_device *pdev) gzvm_drv_irqfd_exit(); gzvm_destroy_all_vms(); misc_deregister(&gzvm_dev); + gzvm_drv_debug_exit(); return 0; } diff --git a/drivers/virt/geniezone/gzvm_vm.c b/drivers/virt/geniezone/gzvm_vm.c index 1af78f161eb3..4861730d555d 100644 --- a/drivers/virt/geniezone/gzvm_vm.c +++ b/drivers/virt/geniezone/gzvm_vm.c @@ -11,11 +11,14 @@ #include #include #include +#include #include "gzvm_common.h" static DEFINE_MUTEX(gzvm_list_lock); static LIST_HEAD(gzvm_list); +static struct dentry *gzvm_debugfs_dir; + u64 gzvm_gfn_to_hva_memslot(struct gzvm_memslot *memslot, u64 gfn) { u64 offset = gfn - memslot->base_gfn; @@ -308,6 +311,12 @@ static void gzvm_destroy_all_ppage(struct gzvm *gzvm) } } +static int gzvm_destroy_vm_debugfs(struct gzvm *vm) +{ + debugfs_remove_recursive(vm->debug_dir); + return 0; +} + static void gzvm_destroy_vm(struct gzvm *gzvm) { size_t allocated_size; @@ -334,6 +343,8 @@ static void gzvm_destroy_vm(struct gzvm *gzvm) /* No need to lock here becauese it's single-threaded execution */ gzvm_destroy_all_ppage(gzvm); + gzvm_destroy_vm_debugfs(gzvm); + kfree(gzvm); } @@ -391,6 +402,113 @@ static void setup_vm_demand_paging(struct gzvm *vm) } } +static int debugfs_open(struct inode *inode, struct file *file) +{ + file->private_data = inode->i_private; + return 0; +} + +/** + * hyp_mem_read() - Get size of hypervisor-allocated memory and stage 2 table + * @file: Pointer to struct file + * @buf: User space buffer for storing the return value + * @len: Size of @buf, in bytes + * @offset: Pointer to loff_t + * + * Return: Size of hypervisor-allocated memory and stage 2 table, in bytes + */ +static ssize_t hyp_mem_read(struct file *file, char __user *buf, size_t len, + loff_t *offset) +{ + char tmp_buffer[GZVM_MAX_DEBUGFS_VALUE_SIZE] = {0}; + struct gzvm *vm = file->private_data; + int ret; + + if (*offset == 0) { + ret = gzvm_arch_get_statistics(vm); + if (ret) + return ret; + snprintf(tmp_buffer, sizeof(tmp_buffer), "%llu\n", + vm->stat.protected_hyp_mem); + if (copy_to_user(buf, tmp_buffer, sizeof(tmp_buffer))) + return -EFAULT; + *offset += sizeof(tmp_buffer); + return sizeof(tmp_buffer); + } + return 0; +} + +/** + * shared_mem_read() - Get size of memory shared between host and guest + * @file: Pointer to struct file + * @buf: User space buffer for storing the return value + * @len: Size of @buf, in bytes + * @offset: Pointer to loff_t + * + * Return: Size of memory shared between host and guest, in bytes + */ +static ssize_t shared_mem_read(struct file *file, char __user *buf, size_t len, + loff_t *offset) +{ + char tmp_buffer[GZVM_MAX_DEBUGFS_VALUE_SIZE] = {0}; + struct gzvm *vm = file->private_data; + int ret; + + if (*offset == 0) { + ret = gzvm_arch_get_statistics(vm); + if (ret) + return ret; + snprintf(tmp_buffer, sizeof(tmp_buffer), "%llu\n", + vm->stat.protected_shared_mem); + if (copy_to_user(buf, tmp_buffer, sizeof(tmp_buffer))) + return -EFAULT; + *offset += sizeof(tmp_buffer); + return sizeof(tmp_buffer); + } + return 0; +} + +static const struct file_operations hyp_mem_fops = { + .owner = THIS_MODULE, + .open = debugfs_open, + .read = hyp_mem_read, + .llseek = no_llseek, +}; + +static const struct file_operations shared_mem_fops = { + .owner = THIS_MODULE, + .open = debugfs_open, + .read = shared_mem_read, + .llseek = no_llseek, +}; + +static int gzvm_create_vm_debugfs(struct gzvm *vm) +{ + struct dentry *dent; + char dir_name[GZVM_MAX_DEBUGFS_DIR_NAME_SIZE]; + + if (vm->debug_dir) { + pr_warn("VM debugfs directory is duplicated\n"); + return 0; + } + + snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), vm->vm_id); + + dent = debugfs_lookup(dir_name, gzvm_debugfs_dir); + if (dent) { + pr_warn("Debugfs directory is duplicated\n"); + dput(dent); + return 0; + } + dent = debugfs_create_dir(dir_name, gzvm_debugfs_dir); + vm->debug_dir = dent; + + debugfs_create_file("protected_shared_mem", 0444, dent, vm, &shared_mem_fops); + debugfs_create_file("protected_hyp_mem", 0444, dent, vm, &hyp_mem_fops); + + return 0; +} + static struct gzvm *gzvm_create_vm(unsigned long vm_type) { int ret; @@ -432,6 +550,8 @@ static struct gzvm *gzvm_create_vm(unsigned long vm_type) list_add(&gzvm->vm_list, &gzvm_list); mutex_unlock(&gzvm_list_lock); + gzvm_create_vm_debugfs(gzvm); + pr_debug("VM-%u is created\n", gzvm->vm_id); return gzvm; @@ -469,3 +589,20 @@ void gzvm_destroy_all_vms(void) out: mutex_unlock(&gzvm_list_lock); } + +int gzvm_drv_debug_init(void) +{ + if (!debugfs_initialized()) + return 0; + + if (!gzvm_debugfs_dir && !debugfs_lookup("gzvm", gzvm_debugfs_dir)) + gzvm_debugfs_dir = debugfs_create_dir("gzvm", NULL); + + return 0; +} + +void gzvm_drv_debug_exit(void) +{ + if (gzvm_debugfs_dir && debugfs_lookup("gzvm", gzvm_debugfs_dir)) + debugfs_remove_recursive(gzvm_debugfs_dir); +} diff --git a/include/linux/gzvm_drv.h b/include/linux/gzvm_drv.h index 2e50ee3011e8..d532d2d31d43 100644 --- a/include/linux/gzvm_drv.h +++ b/include/linux/gzvm_drv.h @@ -47,6 +47,9 @@ #define GZVM_BLOCK_BASED_DEMAND_PAGE_SIZE (2 * 1024 * 1024) /* 2MB */ +#define GZVM_MAX_DEBUGFS_DIR_NAME_SIZE 20 +#define GZVM_MAX_DEBUGFS_VALUE_SIZE 20 + /* struct mem_region_addr_range - Identical to ffa memory constituent */ struct mem_region_addr_range { /* the base IPA of the constituent memory region, aligned to 4 kiB */ @@ -89,6 +92,11 @@ struct gzvm_pinned_page { u64 ipa; }; +struct gzvm_vm_stat { + u64 protected_hyp_mem; + u64 protected_shared_mem; +}; + struct gzvm { struct gzvm_vcpu *vcpus[GZVM_MAX_VCPUS]; /* userspace tied to this vm */ @@ -133,6 +141,9 @@ struct gzvm { struct rb_root pinned_pages; /* lock for memory operations */ struct mutex mem_lock; + + struct gzvm_vm_stat stat; + struct dentry *debug_dir; }; long gzvm_dev_ioctl_check_extension(struct gzvm *gzvm, unsigned long args); @@ -154,6 +165,7 @@ int gzvm_arch_destroy_vm(u16 vm_id); int gzvm_arch_map_guest(u16 vm_id, int memslot_id, u64 pfn, u64 gfn, u64 nr_pages); int gzvm_arch_map_guest_block(u16 vm_id, int memslot_id, u64 gfn, u64 nr_pages); +int gzvm_arch_get_statistics(struct gzvm *gzvm); int gzvm_vm_ioctl_arch_enable_cap(struct gzvm *gzvm, struct gzvm_enable_cap *cap, void __user *argp); @@ -175,6 +187,9 @@ int gzvm_arch_vcpu_run(struct gzvm_vcpu *vcpu, __u64 *exit_reason); int gzvm_arch_destroy_vcpu(u16 vm_id, int vcpuid); int gzvm_arch_inform_exit(u16 vm_id); +int gzvm_drv_debug_init(void); +void gzvm_drv_debug_exit(void); + int gzvm_find_memslot(struct gzvm *vm, u64 gpa); int gzvm_handle_page_fault(struct gzvm_vcpu *vcpu); bool gzvm_handle_guest_exception(struct gzvm_vcpu *vcpu);