Commit 3165af73 authored by Peter Xu's avatar Peter Xu Committed by Paolo Bonzini
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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: default avatarPeter Xu <peterx@redhat.com>
Message-Id: <20210730220455.26054-2-peterx@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent f7782bb8

include/linux/kvm_host.h

+1 −0
Original line number Diff line number Diff line
@@ -1073,6 +1073,7 @@ bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu); 
bool kvm_arch_dy_has_pending_interrupt(struct kvm_vcpu *vcpu);

int kvm_arch_post_init_vm(struct kvm *kvm);

void kvm_arch_pre_destroy_vm(struct kvm *kvm);

int kvm_arch_create_vm_debugfs(struct kvm *kvm);



#ifndef __KVM_HAVE_ARCH_VM_ALLOC

/*

virt/kvm/kvm_main.c

+19 −1
Original line number Diff line number Diff line
@@ -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();