Three ioctl commands are added to support binary form statistics data retrieval. KVM_STATS_GET_INFO, KVM_STATS_GET_NAMES, KVM_STATS_GET_DATA. KVM_CAP_STATS_BINARY_FORM indicates the capability.
Signed-off-by: Jing Zhang <[email protected]> --- virt/kvm/kvm_main.c | 115 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 383df23514b9..87dd62516c8b 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -3464,6 +3464,51 @@ static long kvm_vcpu_ioctl(struct file *filp, r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); break; } + case KVM_STATS_GET_INFO: { + struct kvm_stats_info stats_info; + + r = -EFAULT; + stats_info.num_stats = VCPU_STAT_COUNT; + if (copy_to_user(argp, &stats_info, sizeof(stats_info))) + goto out; + r = 0; + break; + } + case KVM_STATS_GET_NAMES: { + struct kvm_stats_names stats_names; + + r = -EFAULT; + if (copy_from_user(&stats_names, argp, sizeof(stats_names))) + goto out; + r = -EINVAL; + if (stats_names.size < VCPU_STAT_COUNT * KVM_STATS_NAME_LEN) + goto out; + + r = -EFAULT; + if (copy_to_user(argp + sizeof(stats_names), + kvm_vcpu_stat_strings, + VCPU_STAT_COUNT * KVM_STATS_NAME_LEN)) + goto out; + r = 0; + break; + } + case KVM_STATS_GET_DATA: { + struct kvm_stats_data stats_data; + + r = -EFAULT; + if (copy_from_user(&stats_data, argp, sizeof(stats_data))) + goto out; + r = -EINVAL; + if (stats_data.size < sizeof(vcpu->stat)) + goto out; + + r = -EFAULT; + argp += sizeof(stats_data); + if (copy_to_user(argp, &vcpu->stat, sizeof(vcpu->stat))) + goto out; + r = 0; + break; + } default: r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); } @@ -3695,6 +3740,7 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) case KVM_CAP_CHECK_EXTENSION_VM: case KVM_CAP_ENABLE_CAP_VM: case KVM_CAP_HALT_POLL: + case KVM_CAP_STATS_BINARY_FORM: return 1; #ifdef CONFIG_KVM_MMIO case KVM_CAP_COALESCED_MMIO: @@ -3825,6 +3871,40 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm, } } +static long kvm_vm_ioctl_stats_get_data(struct kvm *kvm, unsigned long arg) +{ + void __user *argp = (void __user *)arg; + struct kvm_vcpu *vcpu; + struct kvm_stats_data stats_data; + u64 *data = NULL, *pdata; + int i, j, ret = 0; + size_t dsize = (VM_STAT_COUNT + VCPU_STAT_COUNT) * sizeof(*data); + + + if (copy_from_user(&stats_data, argp, sizeof(stats_data))) + return -EFAULT; + if (stats_data.size < dsize) + return -EINVAL; + data = kzalloc(dsize, GFP_KERNEL_ACCOUNT); + if (!data) + return -ENOMEM; + + for (i = 0; i < VM_STAT_COUNT; i++) + *(data + i) = *((ulong *)&kvm->stat + i); + + kvm_for_each_vcpu(j, vcpu, kvm) { + pdata = data + VM_STAT_COUNT; + for (i = 0; i < VCPU_STAT_COUNT; i++, pdata++) + *pdata += *((u64 *)&vcpu->stat + i); + } + + if (copy_to_user(argp + sizeof(stats_data), data, dsize)) + ret = -EFAULT; + + kfree(data); + return ret; +} + static long kvm_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -4001,6 +4081,41 @@ static long kvm_vm_ioctl(struct file *filp, r = 0; break; } + case KVM_STATS_GET_INFO: { + struct kvm_stats_info stats_info; + + r = -EFAULT; + stats_info.num_stats = VM_STAT_COUNT + VCPU_STAT_COUNT; + if (copy_to_user(argp, &stats_info, sizeof(stats_info))) + goto out; + r = 0; + break; + } + case KVM_STATS_GET_NAMES: { + struct kvm_stats_names stats_names; + + r = -EFAULT; + if (copy_from_user(&stats_names, argp, sizeof(stats_names))) + goto out; + r = -EINVAL; + if (stats_names.size < + (VM_STAT_COUNT + VCPU_STAT_COUNT) * KVM_STATS_NAME_LEN) + goto out; + r = -EFAULT; + argp += sizeof(stats_names); + if (copy_to_user(argp, kvm_vm_stat_strings, + VM_STAT_COUNT * KVM_STATS_NAME_LEN)) + goto out; + argp += VM_STAT_COUNT * KVM_STATS_NAME_LEN; + if (copy_to_user(argp, kvm_vcpu_stat_strings, + VCPU_STAT_COUNT * KVM_STATS_NAME_LEN)) + goto out; + r = 0; + break; + } + case KVM_STATS_GET_DATA: + r = kvm_vm_ioctl_stats_get_data(kvm, arg); + break; case KVM_CHECK_EXTENSION: r = kvm_vm_ioctl_check_extension_generic(kvm, arg); break; -- 2.30.1.766.gb4fecdf3b7-goog _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
