diff options
Diffstat (limited to 'arch/x86/kvm/debugfs.c')
| -rw-r--r-- | arch/x86/kvm/debugfs.c | 144 |
1 files changed, 137 insertions, 7 deletions
diff --git a/arch/x86/kvm/debugfs.c b/arch/x86/kvm/debugfs.c index 018aebce33ff..c1390357126a 100644 --- a/arch/x86/kvm/debugfs.c +++ b/arch/x86/kvm/debugfs.c @@ -7,6 +7,8 @@ #include <linux/kvm_host.h> #include <linux/debugfs.h> #include "lapic.h" +#include "mmu.h" +#include "mmu/mmu_internal.h" static int vcpu_get_timer_advance_ns(void *data, u64 *val) { @@ -17,6 +19,15 @@ static int vcpu_get_timer_advance_ns(void *data, u64 *val) DEFINE_SIMPLE_ATTRIBUTE(vcpu_timer_advance_ns_fops, vcpu_get_timer_advance_ns, NULL, "%llu\n"); +static int vcpu_get_guest_mode(void *data, u64 *val) +{ + struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data; + *val = vcpu->stat.guest_mode; + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(vcpu_guest_mode_fops, vcpu_get_guest_mode, NULL, "%lld\n"); + static int vcpu_get_tsc_offset(void *data, u64 *val) { struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data; @@ -37,28 +48,147 @@ DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_fops, vcpu_get_tsc_scaling_ratio, NULL, static int vcpu_get_tsc_scaling_frac_bits(void *data, u64 *val) { - *val = kvm_tsc_scaling_ratio_frac_bits; + *val = kvm_caps.tsc_scaling_ratio_frac_bits; return 0; } DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_frac_fops, vcpu_get_tsc_scaling_frac_bits, NULL, "%llu\n"); -void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu) +void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) { - debugfs_create_file("tsc-offset", 0444, vcpu->debugfs_dentry, vcpu, + debugfs_create_file("guest_mode", 0444, debugfs_dentry, vcpu, + &vcpu_guest_mode_fops); + debugfs_create_file("tsc-offset", 0444, debugfs_dentry, vcpu, &vcpu_tsc_offset_fops); if (lapic_in_kernel(vcpu)) debugfs_create_file("lapic_timer_advance_ns", 0444, - vcpu->debugfs_dentry, vcpu, + debugfs_dentry, vcpu, &vcpu_timer_advance_ns_fops); - if (kvm_has_tsc_control) { + if (kvm_caps.has_tsc_control) { debugfs_create_file("tsc-scaling-ratio", 0444, - vcpu->debugfs_dentry, vcpu, + debugfs_dentry, vcpu, &vcpu_tsc_scaling_fops); debugfs_create_file("tsc-scaling-ratio-frac-bits", 0444, - vcpu->debugfs_dentry, vcpu, + debugfs_dentry, vcpu, &vcpu_tsc_scaling_frac_fops); } } + +/* + * This covers statistics <1024 (11=log(1024)+1), which should be enough to + * cover RMAP_RECYCLE_THRESHOLD. + */ +#define RMAP_LOG_SIZE 11 + +static const char *kvm_lpage_str[KVM_NR_PAGE_SIZES] = { "4K", "2M", "1G" }; + +static int kvm_mmu_rmaps_stat_show(struct seq_file *m, void *v) +{ + struct kvm_rmap_head *rmap; + struct kvm *kvm = m->private; + struct kvm_memory_slot *slot; + struct kvm_memslots *slots; + unsigned int lpage_size, index; + /* Still small enough to be on the stack */ + unsigned int *log[KVM_NR_PAGE_SIZES], *cur; + int i, j, k, l, ret; + + if (!kvm_memslots_have_rmaps(kvm)) + return 0; + + ret = -ENOMEM; + memset(log, 0, sizeof(log)); + for (i = 0; i < KVM_NR_PAGE_SIZES; i++) { + log[i] = kcalloc(RMAP_LOG_SIZE, sizeof(unsigned int), GFP_KERNEL); + if (!log[i]) + goto out; + } + + mutex_lock(&kvm->slots_lock); + write_lock(&kvm->mmu_lock); + + for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { + int bkt; + + slots = __kvm_memslots(kvm, i); + kvm_for_each_memslot(slot, bkt, slots) + for (k = 0; k < KVM_NR_PAGE_SIZES; k++) { + rmap = slot->arch.rmap[k]; + lpage_size = kvm_mmu_slot_lpages(slot, k + 1); + cur = log[k]; + for (l = 0; l < lpage_size; l++) { + index = ffs(pte_list_count(&rmap[l])); + if (WARN_ON_ONCE(index >= RMAP_LOG_SIZE)) + index = RMAP_LOG_SIZE - 1; + cur[index]++; + } + } + } + + write_unlock(&kvm->mmu_lock); + mutex_unlock(&kvm->slots_lock); + + /* index=0 counts no rmap; index=1 counts 1 rmap */ + seq_printf(m, "Rmap_Count:\t0\t1\t"); + for (i = 2; i < RMAP_LOG_SIZE; i++) { + j = 1 << (i - 1); + k = (1 << i) - 1; + seq_printf(m, "%d-%d\t", j, k); + } + seq_printf(m, "\n"); + + for (i = 0; i < KVM_NR_PAGE_SIZES; i++) { + seq_printf(m, "Level=%s:\t", kvm_lpage_str[i]); + cur = log[i]; + for (j = 0; j < RMAP_LOG_SIZE; j++) + seq_printf(m, "%d\t", cur[j]); + seq_printf(m, "\n"); + } + + ret = 0; +out: + for (i = 0; i < KVM_NR_PAGE_SIZES; i++) + kfree(log[i]); + + return ret; +} + +static int kvm_mmu_rmaps_stat_open(struct inode *inode, struct file *file) +{ + struct kvm *kvm = inode->i_private; + int r; + + if (!kvm_get_kvm_safe(kvm)) + return -ENOENT; + + r = single_open(file, kvm_mmu_rmaps_stat_show, kvm); + if (r < 0) + kvm_put_kvm(kvm); + + return r; +} + +static int kvm_mmu_rmaps_stat_release(struct inode *inode, struct file *file) +{ + struct kvm *kvm = inode->i_private; + + kvm_put_kvm(kvm); + + return single_release(inode, file); +} + +static const struct file_operations mmu_rmaps_stat_fops = { + .open = kvm_mmu_rmaps_stat_open, + .read = seq_read, + .llseek = seq_lseek, + .release = kvm_mmu_rmaps_stat_release, +}; + +int kvm_arch_create_vm_debugfs(struct kvm *kvm) +{ + debugfs_create_file("mmu_rmaps_stat", 0644, kvm->debugfs_dentry, kvm, + &mmu_rmaps_stat_fops); + return 0; +} |