[PATCH v2 03/15] kvm: Add arch-specific per-VM debugfs support

["Suthikulpanit, Suravee" <Suravee.Suthikulpanit@amd.com>]

Introduce per-VM debugfs for providing per-VM debug information.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
 arch/mips/kvm/mips.c       | 5 +++++
 arch/powerpc/kvm/powerpc.c | 5 +++++
 arch/s390/kvm/kvm-s390.c   | 5 +++++
 arch/x86/kvm/debugfs.c     | 5 +++++
 include/linux/kvm_host.h   | 1 +
 virt/kvm/arm/arm.c         | 5 +++++
 virt/kvm/kvm_main.c        | 2 +-
 7 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 0369f26..d8325b7 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -160,6 +160,11 @@ int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
 	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 6d704ad..44766af 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -462,6 +462,11 @@ int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
 	return 0;
 }
 
+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 28ebd64..243b5c4 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2518,6 +2518,11 @@ int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
 	return 0;
 }
 
+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/debugfs.c b/arch/x86/kvm/debugfs.c
index 329361b..d62852c 100644
--- a/arch/x86/kvm/debugfs.c
+++ b/arch/x86/kvm/debugfs.c
@@ -48,6 +48,11 @@ static int vcpu_get_tsc_scaling_frac_bits(void *data, u64 *val)
 
 DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_frac_fops, vcpu_get_tsc_scaling_frac_bits, NULL, "%llu\n");
 
+int kvm_arch_create_vm_debugfs(struct kvm *kvm)
+{
+	return 0;
+}
+
 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
 {
 	struct dentry *ret;
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index d1ad38a..ef9f176 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -862,6 +862,7 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 
 bool kvm_arch_has_vcpu_debugfs(void);
 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu);
+int kvm_arch_create_vm_debugfs(struct kvm *kvm);
 
 int kvm_arch_hardware_enable(void);
 void kvm_arch_hardware_disable(void);
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index bd5c559..8812c55 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -154,6 +154,11 @@ int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
 	return 0;
 }
 
+int kvm_arch_create_vm_debugfs(struct kvm *kvm)
+{
+	return 0;
+}
+
 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 {
 	return VM_FAULT_SIGBUS;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 2f2d24a..e39db0c 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -620,7 +620,7 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
 		debugfs_create_file(p->name, 0644, kvm->debugfs_dentry,
 				    stat_data, stat_fops_per_vm[p->kind]);
 	}
-	return 0;
+	return kvm_arch_create_vm_debugfs(kvm);
 }
 
 static struct kvm *kvm_create_vm(unsigned long type)
-- 
1.8.3.1