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authorPeter Xu <peterx@redhat.com>2021-07-30 18:04:49 -0400
committerPaolo Bonzini <pbonzini@redhat.com>2021-08-13 03:35:17 -0400
commit3165af738ed3224a84ead7d97c6909de2e453b4c (patch)
treece0cf464cc46668526d4a40ca6393cfd23e98ad3 /virt
parentf7782bb8d818d8f47c26b22079db10599922787a (diff)
KVM: Allow to have arch-specific per-vm debugfs files
Allow archs to create arch-specific nodes under kvm->debugfs_dentry directory besides the stats fields. The new interface kvm_arch_create_vm_debugfs() is defined but not yet used. It's called after kvm->debugfs_dentry is created, so it can be referenced directly in kvm_arch_create_vm_debugfs(). Arch should define their own versions when they want to create extra debugfs nodes. Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <20210730220455.26054-2-peterx@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index c115e2648d9d..3e81b5d8b709 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -919,7 +919,7 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
char dir_name[ITOA_MAX_LEN * 2];
struct kvm_stat_data *stat_data;
const struct _kvm_stats_desc *pdesc;
- int i;
+ int i, ret;
int kvm_debugfs_num_entries = kvm_vm_stats_header.num_desc +
kvm_vcpu_stats_header.num_desc;
@@ -976,6 +976,13 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
kvm->debugfs_dentry, stat_data,
&stat_fops_per_vm);
}
+
+ ret = kvm_arch_create_vm_debugfs(kvm);
+ if (ret) {
+ kvm_destroy_vm_debugfs(kvm);
+ return i;
+ }
+
return 0;
}
@@ -996,6 +1003,17 @@ void __weak kvm_arch_pre_destroy_vm(struct kvm *kvm)
{
}
+/*
+ * Called after per-vm debugfs created. When called kvm->debugfs_dentry should
+ * be setup already, so we can create arch-specific debugfs entries under it.
+ * Cleanup should be automatic done in kvm_destroy_vm_debugfs() recursively, so
+ * a per-arch destroy interface is not needed.
+ */
+int __weak kvm_arch_create_vm_debugfs(struct kvm *kvm)
+{
+ return 0;
+}
+
static struct kvm *kvm_create_vm(unsigned long type)
{
struct kvm *kvm = kvm_arch_alloc_vm();