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186 lines
4.7 KiB
186 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Kernel-based Virtual Machine driver for Linux |
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* |
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* Copyright 2016 Red Hat, Inc. and/or its affiliates. |
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*/ |
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#include <linux/kvm_host.h> |
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#include <linux/debugfs.h> |
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#include "lapic.h" |
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#include "mmu.h" |
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#include "mmu/mmu_internal.h" |
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static int vcpu_get_timer_advance_ns(void *data, u64 *val) |
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{ |
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struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data; |
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*val = vcpu->arch.apic->lapic_timer.timer_advance_ns; |
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return 0; |
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} |
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DEFINE_SIMPLE_ATTRIBUTE(vcpu_timer_advance_ns_fops, vcpu_get_timer_advance_ns, NULL, "%llu\n"); |
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static int vcpu_get_guest_mode(void *data, u64 *val) |
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{ |
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struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data; |
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*val = vcpu->stat.guest_mode; |
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return 0; |
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} |
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DEFINE_SIMPLE_ATTRIBUTE(vcpu_guest_mode_fops, vcpu_get_guest_mode, NULL, "%lld\n"); |
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static int vcpu_get_tsc_offset(void *data, u64 *val) |
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{ |
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struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data; |
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*val = vcpu->arch.tsc_offset; |
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return 0; |
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} |
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DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_offset_fops, vcpu_get_tsc_offset, NULL, "%lld\n"); |
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static int vcpu_get_tsc_scaling_ratio(void *data, u64 *val) |
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{ |
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struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data; |
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*val = vcpu->arch.tsc_scaling_ratio; |
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return 0; |
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} |
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DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_fops, vcpu_get_tsc_scaling_ratio, NULL, "%llu\n"); |
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static int vcpu_get_tsc_scaling_frac_bits(void *data, u64 *val) |
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{ |
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*val = kvm_tsc_scaling_ratio_frac_bits; |
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return 0; |
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} |
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DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_frac_fops, vcpu_get_tsc_scaling_frac_bits, NULL, "%llu\n"); |
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void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) |
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{ |
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debugfs_create_file("guest_mode", 0444, debugfs_dentry, vcpu, |
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&vcpu_guest_mode_fops); |
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debugfs_create_file("tsc-offset", 0444, debugfs_dentry, vcpu, |
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&vcpu_tsc_offset_fops); |
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if (lapic_in_kernel(vcpu)) |
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debugfs_create_file("lapic_timer_advance_ns", 0444, |
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debugfs_dentry, vcpu, |
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&vcpu_timer_advance_ns_fops); |
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if (kvm_has_tsc_control) { |
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debugfs_create_file("tsc-scaling-ratio", 0444, |
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debugfs_dentry, vcpu, |
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&vcpu_tsc_scaling_fops); |
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debugfs_create_file("tsc-scaling-ratio-frac-bits", 0444, |
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debugfs_dentry, vcpu, |
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&vcpu_tsc_scaling_frac_fops); |
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} |
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} |
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/* |
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* This covers statistics <1024 (11=log(1024)+1), which should be enough to |
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* cover RMAP_RECYCLE_THRESHOLD. |
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*/ |
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#define RMAP_LOG_SIZE 11 |
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static const char *kvm_lpage_str[KVM_NR_PAGE_SIZES] = { "4K", "2M", "1G" }; |
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static int kvm_mmu_rmaps_stat_show(struct seq_file *m, void *v) |
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{ |
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struct kvm_rmap_head *rmap; |
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struct kvm *kvm = m->private; |
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struct kvm_memory_slot *slot; |
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struct kvm_memslots *slots; |
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unsigned int lpage_size, index; |
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/* Still small enough to be on the stack */ |
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unsigned int *log[KVM_NR_PAGE_SIZES], *cur; |
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int i, j, k, l, ret; |
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ret = -ENOMEM; |
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memset(log, 0, sizeof(log)); |
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for (i = 0; i < KVM_NR_PAGE_SIZES; i++) { |
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log[i] = kcalloc(RMAP_LOG_SIZE, sizeof(unsigned int), GFP_KERNEL); |
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if (!log[i]) |
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goto out; |
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} |
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mutex_lock(&kvm->slots_lock); |
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write_lock(&kvm->mmu_lock); |
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for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { |
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slots = __kvm_memslots(kvm, i); |
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for (j = 0; j < slots->used_slots; j++) { |
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slot = &slots->memslots[j]; |
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for (k = 0; k < KVM_NR_PAGE_SIZES; k++) { |
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rmap = slot->arch.rmap[k]; |
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lpage_size = kvm_mmu_slot_lpages(slot, k + 1); |
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cur = log[k]; |
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for (l = 0; l < lpage_size; l++) { |
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index = ffs(pte_list_count(&rmap[l])); |
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if (WARN_ON_ONCE(index >= RMAP_LOG_SIZE)) |
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index = RMAP_LOG_SIZE - 1; |
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cur[index]++; |
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} |
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} |
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} |
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} |
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write_unlock(&kvm->mmu_lock); |
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mutex_unlock(&kvm->slots_lock); |
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/* index=0 counts no rmap; index=1 counts 1 rmap */ |
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seq_printf(m, "Rmap_Count:\t0\t1\t"); |
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for (i = 2; i < RMAP_LOG_SIZE; i++) { |
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j = 1 << (i - 1); |
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k = (1 << i) - 1; |
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seq_printf(m, "%d-%d\t", j, k); |
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} |
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seq_printf(m, "\n"); |
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for (i = 0; i < KVM_NR_PAGE_SIZES; i++) { |
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seq_printf(m, "Level=%s:\t", kvm_lpage_str[i]); |
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cur = log[i]; |
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for (j = 0; j < RMAP_LOG_SIZE; j++) |
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seq_printf(m, "%d\t", cur[j]); |
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seq_printf(m, "\n"); |
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} |
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ret = 0; |
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out: |
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for (i = 0; i < KVM_NR_PAGE_SIZES; i++) |
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kfree(log[i]); |
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return ret; |
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} |
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static int kvm_mmu_rmaps_stat_open(struct inode *inode, struct file *file) |
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{ |
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struct kvm *kvm = inode->i_private; |
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if (!kvm_get_kvm_safe(kvm)) |
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return -ENOENT; |
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return single_open(file, kvm_mmu_rmaps_stat_show, kvm); |
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} |
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static int kvm_mmu_rmaps_stat_release(struct inode *inode, struct file *file) |
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{ |
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struct kvm *kvm = inode->i_private; |
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kvm_put_kvm(kvm); |
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return single_release(inode, file); |
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} |
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static const struct file_operations mmu_rmaps_stat_fops = { |
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.open = kvm_mmu_rmaps_stat_open, |
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.read = seq_read, |
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.llseek = seq_lseek, |
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.release = kvm_mmu_rmaps_stat_release, |
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}; |
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int kvm_arch_create_vm_debugfs(struct kvm *kvm) |
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{ |
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debugfs_create_file("mmu_rmaps_stat", 0644, kvm->debugfs_dentry, kvm, |
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&mmu_rmaps_stat_fops); |
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return 0; |
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}
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