linux-kernel - [PATCH 3/4] kvm: add stub for arch specific debugfs support

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Date:   Wed, 31 Aug 2016 13:05:44 -0400
From:   Luiz Capitulino <lcapitulino@...hat.com>
To:     kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, pbonzini@...hat.com,
        rkrcmar@...hat.com, rostedt@...dmis.org, mhiramat@...nel.org,
        mtosatti@...hat.com
Subject: [PATCH 3/4] kvm: add stub for arch specific debugfs support

kvm_arch_create_vm_debugfs() allows arch specific code to
create entries in the VM's directory in debugfs. x86 will
implement support for this in the next commit.

Signed-off-by: Luiz Capitulino <lcapitulino@...hat.com>
---
 arch/arm/kvm/arm.c         | 5 +++++
 arch/mips/kvm/mips.c       | 5 +++++
 arch/powerpc/kvm/powerpc.c | 5 +++++
 arch/s390/kvm/kvm-s390.c   | 5 +++++
 arch/x86/kvm/x86.c         | 5 +++++
 include/linux/kvm_host.h   | 2 ++
 virt/kvm/kvm_main.c        | 4 ++++
 7 files changed, 31 insertions(+)

diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 75f130e..491211f 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -144,6 +144,11 @@ out_fail_alloc:
 	return ret;
 }
 
+int kvm_arch_create_vm_debugfs(struct kvm *kvm)
+{
+	return 0;
+}
+
 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 {
 	return VM_FAULT_SIGBUS;
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index a6ea084..a854b8b 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -140,6 +140,11 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 	return 0;
 }
 
+int kvm_arch_create_vm_debugfs(struct kvm *kvm)
+{
+	return 0;
+}
+
 void kvm_mips_free_vcpus(struct kvm *kvm)
 {
 	unsigned int i;
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 6ce40dd..d8867e5 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -436,6 +436,11 @@ err_out:
 	return -EINVAL;
 }
 
+int kvm_arch_create_vm_debugfs(struct kvm *kvm)
+{
+	return 0;
+}
+
 void kvm_arch_destroy_vm(struct kvm *kvm)
 {
 	unsigned int i;
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index f142215..406324c 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -1490,6 +1490,11 @@ out_err:
 	return rc;
 }
 
+int kvm_arch_create_vm_debugfs(struct kvm *kvm)
+{
+	return 0;
+}
+
 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
 	VCPU_EVENT(vcpu, 3, "%s", "free cpu");
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 19f9f9e..18dfbac 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7779,6 +7779,11 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 	return 0;
 }
 
+int kvm_arch_create_vm_debugfs(struct kvm *kvm)
+{
+	return 0;
+}
+
 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
 {
 	int r;
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 9c28b4d..d3810bf 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -835,6 +835,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
 void kvm_arch_destroy_vm(struct kvm *kvm);
 void kvm_arch_sync_events(struct kvm *kvm);
 
+int kvm_arch_create_vm_debugfs(struct kvm *kvm);
+
 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
 void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
 
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 9293285..2db53a8 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -601,6 +601,10 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
 					 stat_fops_per_vm[p->kind]))
 			goto out_err;
 	}
+
+	if (kvm_arch_create_vm_debugfs(kvm) < 0)
+		goto out_err;
+
 	return 0;
 
 out_err:
-- 
2.5.5