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authorVineeth Pillai <vineeth@bitbyteword.org>2022-05-23 15:03:27 -0400
committerPaolo Bonzini <pbonzini@redhat.com>2022-06-24 12:44:33 -0400
commite36de87d34a7f2f26b2e2129c6dc18a0024663eb (patch)
tree918a3c1b2ab14fea239dd480a75f04369765d161 /virt
parent4de5c54f8c806621ab055eeb240877d75d53b208 (diff)
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KVM: debugfs: expose pid of vcpu threads
Add a new debugfs file to expose the pid of each vcpu threads. This is very helpful for userland tools to get the vcpu pids without worrying about thread naming conventions of the VMM. Signed-off-by: Vineeth Pillai (Google) <vineeth@bitbyteword.org> Message-Id: <20220523190327.2658-1-vineeth@bitbyteword.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 45188d11812c..da263c370d00 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3822,9 +3822,18 @@ static int create_vcpu_fd(struct kvm_vcpu *vcpu)
return anon_inode_getfd(name, &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
}
+#ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS
+static int vcpu_get_pid(void *data, u64 *val)
+{
+ struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
+ *val = pid_nr(rcu_access_pointer(vcpu->pid));
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(vcpu_get_pid_fops, vcpu_get_pid, NULL, "%llu\n");
+
static void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
{
-#ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS
struct dentry *debugfs_dentry;
char dir_name[ITOA_MAX_LEN * 2];
@@ -3834,10 +3843,12 @@ static void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id);
debugfs_dentry = debugfs_create_dir(dir_name,
vcpu->kvm->debugfs_dentry);
+ debugfs_create_file("pid", 0444, debugfs_dentry, vcpu,
+ &vcpu_get_pid_fops);
kvm_arch_create_vcpu_debugfs(vcpu, debugfs_dentry);
-#endif
}
+#endif
/*
* Creates some virtual cpus. Good luck creating more than one.