From: Jerry Wang <[email protected]> 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/<pid>-<vmid>/protected_hyp_mem` shows memory used by the hypervisor and the size of the stage 2 table in bytes. `cat /sys/kernel/debug/gzvm/<pid>-<vmid>/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 <[email protected]> Signed-off-by: Yi-De Wu <[email protected]> Signed-off-by: Liju Chen <[email protected]> --- arch/arm64/geniezone/gzvm_arch_common.h | 2 + arch/arm64/geniezone/vm.c | 13 +++ drivers/virt/geniezone/gzvm_main.c | 25 ++++++ drivers/virt/geniezone/gzvm_vm.c | 115 ++++++++++++++++++++++++ include/linux/soc/mediatek/gzvm_drv.h | 16 ++++ 5 files changed, 171 insertions(+) diff --git a/arch/arm64/geniezone/gzvm_arch_common.h b/arch/arm64/geniezone/gzvm_arch_common.h index 8a082ba808a4..192d023722e5 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 91c6e4e2caf2..0350d9444c18 100644 --- a/arch/arm64/geniezone/vm.c +++ b/arch/arm64/geniezone/vm.c @@ -444,3 +444,16 @@ 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 c975912cd594..1816eecfcefb 100644 --- a/drivers/virt/geniezone/gzvm_main.c +++ b/drivers/virt/geniezone/gzvm_main.c @@ -3,6 +3,7 @@ * Copyright (c) 2023 MediaTek Inc. */ +#include <linux/debugfs.h> #include <linux/device.h> #include <linux/file.h> #include <linux/kdev_t.h> @@ -80,6 +81,25 @@ static void gzvm_drv_sysfs_exit(void) kobject_del(gzvm_drv.sysfs_root_dir); } +static int gzvm_drv_debug_init(void) +{ + if (!debugfs_initialized()) { + pr_warn("debugfs not initialized!\n"); + return 0; + } + + gzvm_drv.gzvm_debugfs_dir = debugfs_create_dir("gzvm", NULL); + if (!gzvm_drv.gzvm_debugfs_dir) + return -ENOMEM; + + return 0; +} + +static void gzvm_drv_debug_exit(void) +{ + debugfs_remove_recursive(gzvm_drv.gzvm_debugfs_dir); +} + /** * gzvm_err_to_errno() - Convert geniezone return value to standard errno * @@ -221,6 +241,10 @@ static int gzvm_drv_probe(struct platform_device *pdev) if (ret) return ret; + ret = gzvm_drv_debug_init(); + if (ret) + return ret; + ret = gzvm_drv_sysfs_init(); if (ret) return ret; @@ -236,6 +260,7 @@ static void gzvm_drv_remove(struct platform_device *pdev) { gzvm_drv_irqfd_exit(); misc_deregister(&gzvm_dev); + gzvm_drv_debug_exit(); gzvm_drv_sysfs_exit(); } diff --git a/drivers/virt/geniezone/gzvm_vm.c b/drivers/virt/geniezone/gzvm_vm.c index e44ee2d04ed8..2ce36ad8791b 100644 --- a/drivers/virt/geniezone/gzvm_vm.c +++ b/drivers/virt/geniezone/gzvm_vm.c @@ -4,6 +4,7 @@ */ #include <linux/anon_inodes.h> +#include <linux/debugfs.h> #include <linux/file.h> #include <linux/kdev_t.h> #include <linux/mm.h> @@ -342,6 +343,12 @@ 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; @@ -369,6 +376,8 @@ 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); } @@ -427,6 +436,108 @@ static void setup_vm_demand_paging(struct gzvm *vm) } } +/** + * 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 = { + .open = simple_open, + .read = hyp_mem_read, +}; + +static const struct file_operations shared_mem_fops = { + .open = simple_open, + .read = shared_mem_read, +}; + +static int gzvm_create_vm_debugfs(struct gzvm *vm) +{ + struct dentry *dent; + char dir_name[GZVM_MAX_DEBUGFS_DIR_NAME_SIZE]; + + if (!vm->gzvm_drv->gzvm_debugfs_dir) { + pr_warn("VM debugfs directory is not exist\n"); + return -EFAULT; + } + + 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, vm->gzvm_drv->gzvm_debugfs_dir); + if (dent) { + pr_warn("Debugfs directory is duplicated\n"); + dput(dent); + return 0; + } + dent = debugfs_create_dir(dir_name, vm->gzvm_drv->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 int setup_mem_alloc_mode(struct gzvm *vm) { int ret; @@ -487,6 +598,10 @@ static struct gzvm *gzvm_create_vm(struct gzvm_driver *drv, unsigned long vm_typ list_add(&gzvm->vm_list, &gzvm_list); mutex_unlock(&gzvm_list_lock); + ret = gzvm_create_vm_debugfs(gzvm); + if (ret) + pr_debug("Failed to create debugfs for VM-%u\n", gzvm->vm_id); + pr_debug("VM-%u is created\n", gzvm->vm_id); return gzvm; diff --git a/include/linux/soc/mediatek/gzvm_drv.h b/include/linux/soc/mediatek/gzvm_drv.h index 7065ec36f190..bafdd7c2bdc8 100644 --- a/include/linux/soc/mediatek/gzvm_drv.h +++ b/include/linux/soc/mediatek/gzvm_drv.h @@ -30,6 +30,8 @@ struct gzvm_driver { struct kobject *sysfs_root_dir; u32 demand_paging_batch_pages; + + struct dentry *gzvm_debugfs_dir; }; /* @@ -67,6 +69,9 @@ struct gzvm_driver { #define GZVM_DRV_DEMAND_PAGING_BATCH_PAGES \ (GZVM_BLOCK_BASED_DEMAND_PAGE_SIZE / PAGE_SIZE) +#define GZVM_MAX_DEBUGFS_DIR_NAME_SIZE 20 +#define GZVM_MAX_DEBUGFS_VALUE_SIZE 20 + enum gzvm_demand_paging_mode { GZVM_FULLY_POPULATED = 0, GZVM_DEMAND_PAGING = 1, @@ -132,6 +137,11 @@ struct gzvm_pinned_page { u64 ipa; }; +struct gzvm_vm_stat { + u64 protected_hyp_mem; + u64 protected_shared_mem; +}; + /** * struct gzvm: the following data structures are for data transferring between * driver and hypervisor, and they're aligned with hypervisor definitions. @@ -156,6 +166,8 @@ struct gzvm_pinned_page { * @demand_page_buffer: the mailbox for transferring large portion pages * @demand_paging_lock: lock for preventing multiple cpu using the same demand * page mailbox at the same time + * @stat: information for VM memory statistics + * @debug_dir: debugfs directory node for VM memory statistics */ struct gzvm { struct gzvm_driver *gzvm_drv; @@ -188,6 +200,9 @@ struct gzvm { u32 demand_page_gran; u64 *demand_page_buffer; struct mutex demand_paging_lock; + + struct gzvm_vm_stat stat; + struct dentry *debug_dir; }; long gzvm_dev_ioctl_check_extension(struct gzvm *gzvm, unsigned long args); @@ -213,6 +228,7 @@ 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); -- 2.18.0
