Message ID | 1499775163-26797-2-git-send-email-imbrenda@linux.vnet.ibm.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
Hi Claudio, [auto build test ERROR on kvm/linux-next] [also build test ERROR on v4.12 next-20170711] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Claudio-Imbrenda/KVM-trigger-uevents-when-creating-or-destroying-a-VM/20170712-023748 base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next config: x86_64-allyesdebian (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All errors (new ones prefixed by >>): arch/x86/kvm/../../../virt/kvm/kvm_main.c: In function 'kvm_uevent_notify_change': >> arch/x86/kvm/../../../virt/kvm/kvm_main.c:3892:24: error: 'struct mm_struct' has no member named 'owner' if (kvm->mm && kvm->mm->owner) { ^~ arch/x86/kvm/../../../virt/kvm/kvm_main.c:3893:40: error: 'struct mm_struct' has no member named 'owner' add_uevent_var(env, "PID=%d", kvm->mm->owner->pid); ^~ vim +3892 arch/x86/kvm/../../../virt/kvm/kvm_main.c 3864 3865 static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm) 3866 { 3867 struct kobj_uevent_env *env; 3868 char *tmp, *pathbuf = NULL; 3869 unsigned long long created, active; 3870 3871 if (!kvm_dev.this_device || !kvm) 3872 return; 3873 3874 spin_lock(&kvm_lock); 3875 if (type == KVM_EVENT_CREATE_VM) { 3876 kvm_createvm_count++; 3877 kvm_active_vms++; 3878 } else if (type == KVM_EVENT_DESTROY_VM) { 3879 kvm_active_vms--; 3880 } 3881 created = kvm_createvm_count; 3882 active = kvm_active_vms; 3883 spin_unlock(&kvm_lock); 3884 3885 env = kzalloc(sizeof(*env), GFP_KERNEL); 3886 if (!env) 3887 return; 3888 3889 add_uevent_var(env, "CREATED=%llu", created); 3890 add_uevent_var(env, "COUNT=%llu", active); 3891 > 3892 if (kvm->mm && kvm->mm->owner) { 3893 add_uevent_var(env, "PID=%d", kvm->mm->owner->pid); 3894 } else if (kvm->debugfs_dentry) { 3895 char p[ITOA_MAX_LEN]; 3896 3897 snprintf(p, sizeof(p), "%s", kvm->debugfs_dentry->d_name.name); 3898 tmp = strchrnul(p + 1, '-'); 3899 *tmp = '\0'; 3900 add_uevent_var(env, "PID=%s", p); 3901 } 3902 3903 if (type == KVM_EVENT_CREATE_VM) 3904 add_uevent_var(env, "EVENT=create"); 3905 else if (type == KVM_EVENT_DESTROY_VM) 3906 add_uevent_var(env, "EVENT=destroy"); 3907 3908 if (kvm->debugfs_dentry) { 3909 pathbuf = kmalloc(PATH_MAX, GFP_KERNEL); 3910 if (pathbuf) { 3911 /* sizeof counts the final '\0' */ 3912 int len = sizeof("STATS_PATH=") - 1; 3913 const char *pvar = "STATS_PATH="; 3914 3915 tmp = dentry_path_raw(kvm->debugfs_dentry, 3916 pathbuf + len, 3917 PATH_MAX - len); 3918 if (!IS_ERR(tmp)) { 3919 memcpy(tmp - len, pvar, len); 3920 env->envp[env->envp_idx++] = tmp - len; 3921 } 3922 } 3923 } 3924 /* no need for checks, since we are adding at most only 5 keys */ 3925 env->envp[env->envp_idx++] = NULL; 3926 kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp); 3927 kfree(env); 3928 kfree(pathbuf); 3929 } 3930 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
Hi Claudio, [auto build test ERROR on kvm/linux-next] [also build test ERROR on v4.12 next-20170711] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Claudio-Imbrenda/KVM-trigger-uevents-when-creating-or-destroying-a-VM/20170712-023748 base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next config: powerpc-defconfig (attached as .config) compiler: powerpc64-linux-gnu-gcc (Debian 6.3.0-18) 6.3.0 20170516 reproduce: wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=powerpc All errors (new ones prefixed by >>): arch/powerpc/kvm/../../../virt/kvm/kvm_main.c: In function 'kvm_uevent_notify_change': >> arch/powerpc/kvm/../../../virt/kvm/kvm_main.c:3892:24: error: 'struct mm_struct' has no member named 'owner' if (kvm->mm && kvm->mm->owner) { ^~ arch/powerpc/kvm/../../../virt/kvm/kvm_main.c:3893:40: error: 'struct mm_struct' has no member named 'owner' add_uevent_var(env, "PID=%d", kvm->mm->owner->pid); ^~ vim +3892 arch/powerpc/kvm/../../../virt/kvm/kvm_main.c 3864 3865 static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm) 3866 { 3867 struct kobj_uevent_env *env; 3868 char *tmp, *pathbuf = NULL; 3869 unsigned long long created, active; 3870 3871 if (!kvm_dev.this_device || !kvm) 3872 return; 3873 3874 spin_lock(&kvm_lock); 3875 if (type == KVM_EVENT_CREATE_VM) { 3876 kvm_createvm_count++; 3877 kvm_active_vms++; 3878 } else if (type == KVM_EVENT_DESTROY_VM) { 3879 kvm_active_vms--; 3880 } 3881 created = kvm_createvm_count; 3882 active = kvm_active_vms; 3883 spin_unlock(&kvm_lock); 3884 3885 env = kzalloc(sizeof(*env), GFP_KERNEL); 3886 if (!env) 3887 return; 3888 3889 add_uevent_var(env, "CREATED=%llu", created); 3890 add_uevent_var(env, "COUNT=%llu", active); 3891 > 3892 if (kvm->mm && kvm->mm->owner) { 3893 add_uevent_var(env, "PID=%d", kvm->mm->owner->pid); 3894 } else if (kvm->debugfs_dentry) { 3895 char p[ITOA_MAX_LEN]; 3896 3897 snprintf(p, sizeof(p), "%s", kvm->debugfs_dentry->d_name.name); 3898 tmp = strchrnul(p + 1, '-'); 3899 *tmp = '\0'; 3900 add_uevent_var(env, "PID=%s", p); 3901 } 3902 3903 if (type == KVM_EVENT_CREATE_VM) 3904 add_uevent_var(env, "EVENT=create"); 3905 else if (type == KVM_EVENT_DESTROY_VM) 3906 add_uevent_var(env, "EVENT=destroy"); 3907 3908 if (kvm->debugfs_dentry) { 3909 pathbuf = kmalloc(PATH_MAX, GFP_KERNEL); 3910 if (pathbuf) { 3911 /* sizeof counts the final '\0' */ 3912 int len = sizeof("STATS_PATH=") - 1; 3913 const char *pvar = "STATS_PATH="; 3914 3915 tmp = dentry_path_raw(kvm->debugfs_dentry, 3916 pathbuf + len, 3917 PATH_MAX - len); 3918 if (!IS_ERR(tmp)) { 3919 memcpy(tmp - len, pvar, len); 3920 env->envp[env->envp_idx++] = tmp - len; 3921 } 3922 } 3923 } 3924 /* no need for checks, since we are adding at most only 5 keys */ 3925 env->envp[env->envp_idx++] = NULL; 3926 kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp); 3927 kfree(env); 3928 kfree(pathbuf); 3929 } 3930 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index f0fe9d0..4a7a632 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -130,6 +130,12 @@ EXPORT_SYMBOL_GPL(kvm_rebooting); static bool largepages_enabled = true; +#define KVM_EVENT_CREATE_VM 0 +#define KVM_EVENT_DESTROY_VM 1 +static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm); +static unsigned long long kvm_createvm_count; +static unsigned long long kvm_active_vms; + bool kvm_is_reserved_pfn(kvm_pfn_t pfn) { if (pfn_valid(pfn)) @@ -728,6 +734,7 @@ static void kvm_destroy_vm(struct kvm *kvm) int i; struct mm_struct *mm = kvm->mm; + kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm); kvm_destroy_vm_debugfs(kvm); kvm_arch_sync_events(kvm); spin_lock(&kvm_lock); @@ -3196,6 +3203,7 @@ static int kvm_dev_ioctl_create_vm(unsigned long type) fput(file); return -ENOMEM; } + kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm); fd_install(r, file); return r; @@ -3848,6 +3856,72 @@ static const struct file_operations *stat_fops[] = { [KVM_STAT_VM] = &vm_stat_fops, }; +static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm) +{ + struct kobj_uevent_env *env; + char *tmp, *pathbuf = NULL; + unsigned long long created, active; + + if (!kvm_dev.this_device || !kvm) + return; + + spin_lock(&kvm_lock); + if (type == KVM_EVENT_CREATE_VM) { + kvm_createvm_count++; + kvm_active_vms++; + } else if (type == KVM_EVENT_DESTROY_VM) { + kvm_active_vms--; + } + created = kvm_createvm_count; + active = kvm_active_vms; + spin_unlock(&kvm_lock); + + env = kzalloc(sizeof(*env), GFP_KERNEL); + if (!env) + return; + + add_uevent_var(env, "CREATED=%llu", created); + add_uevent_var(env, "COUNT=%llu", active); + + if (kvm->mm && kvm->mm->owner) { + add_uevent_var(env, "PID=%d", kvm->mm->owner->pid); + } else if (kvm->debugfs_dentry) { + char p[ITOA_MAX_LEN]; + + snprintf(p, sizeof(p), "%s", kvm->debugfs_dentry->d_name.name); + tmp = strchrnul(p + 1, '-'); + *tmp = '\0'; + add_uevent_var(env, "PID=%s", p); + } + + if (type == KVM_EVENT_CREATE_VM) + add_uevent_var(env, "EVENT=create"); + else if (type == KVM_EVENT_DESTROY_VM) + add_uevent_var(env, "EVENT=destroy"); + + if (kvm->debugfs_dentry) { + pathbuf = kmalloc(PATH_MAX, GFP_KERNEL); + if (pathbuf) { + /* sizeof counts the final '\0' */ + int len = sizeof("STATS_PATH=") - 1; + const char *pvar = "STATS_PATH="; + + tmp = dentry_path_raw(kvm->debugfs_dentry, + pathbuf + len, + PATH_MAX - len); + if (!IS_ERR(tmp)) { + memcpy(tmp - len, pvar, len); + env->envp[env->envp_idx++] = tmp - len; + } + } + } + /* no need for checks, since we are adding at most only 5 keys */ + env->envp[env->envp_idx++] = NULL; + kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp); + kfree(env); + kfree(pathbuf); +} + static int kvm_init_debug(void) { int r = -EEXIST;
This patch adds a few lines to the KVM common code to fire a KOBJ_CHANGE uevent whenever a KVM VM is created or destroyed. The event carries five environment variables: CREATED indicates how many times a new VM has been created. It is useful for example to trigger specific actions when the first VM is started COUNT indicates how many VMs are currently active. This can be used for logging or monitoring purposes PID has the pid of the KVM process that has been started or stopped. This can be used to perform process-specific tuning. STATS_PATH contains the path in debugfs to the directory with all the runtime statistics for this VM. This is useful for performance monitoring and profiling. EVENT described the type of event, its value can be either "create" or "destroy" Specific udev rules can be then set up in userspace to deal with the creation or destruction of VMs as needed. Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com> --- virt/kvm/kvm_main.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+)