284851ee5c
The general expectation with debugfs is that any initialization failure is nonfatal. Nevertheless, kvm_arch_create_vm_debugfs() allows implementations to return an error and kvm_create_vm_debugfs() allows that to fail VM creation. Change to a void return to discourage architectures from making debugfs failures fatal for the VM. Seems like everyone already had the right idea, as all implementations already return 0 unconditionally. Acked-by: Marc Zyngier <maz@kernel.org> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Link: https://lore.kernel.org/r/20240216155941.2029458-1-oliver.upton@linux.dev Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
197 lines
4.9 KiB
C
197 lines
4.9 KiB
C
// 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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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_caps.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_caps.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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if (!kvm_memslots_have_rmaps(kvm))
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return 0;
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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_arch_nr_memslot_as_ids(kvm); i++) {
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int bkt;
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slots = __kvm_memslots(kvm, i);
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kvm_for_each_memslot(slot, bkt, slots)
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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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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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int r;
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if (!kvm_get_kvm_safe(kvm))
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return -ENOENT;
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r = single_open(file, kvm_mmu_rmaps_stat_show, kvm);
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if (r < 0)
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kvm_put_kvm(kvm);
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return r;
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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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.owner = THIS_MODULE,
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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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void 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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}
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