[PATCH v6 02/33] KVM: Make device name configurable

[Steffen Eiden <seiden@linux.ibm.com>]

Allow KVM implementations to choose alternative device names. This is
especially useful for architectures providing multiple KVM
implementations simultaneously.

Co-developed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
---
 include/linux/kvm_host.h |  4 +++-
 virt/kvm/async_pf.c      | 13 ++++++++++--
 virt/kvm/async_pf.h      |  4 ++--
 virt/kvm/kvm_main.c      | 43 ++++++++++++++++++++++++++++++----------
 4 files changed, 49 insertions(+), 15 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 1c5bf2801bf1..6ea6322ba8b5 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1081,7 +1081,9 @@ static inline void kvm_irqfd_exit(void)
 {
 }
 #endif
-int kvm_init(unsigned vcpu_size, unsigned vcpu_align, struct module *module);
+int kvm_init(unsigned int vcpu_size, unsigned int vcpu_align, struct module *module);
+int kvm_init_with_dev(unsigned int vcpu_size, unsigned int vcpu_align,
+		      struct module *module, const char *dev_name, int minor);
 void kvm_exit(void);
 
 void kvm_get_kvm(struct kvm *kvm);
diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
index b8aaa96b799b..015761249107 100644
--- a/virt/kvm/async_pf.c
+++ b/virt/kvm/async_pf.c
@@ -19,9 +19,18 @@
 
 static struct kmem_cache *async_pf_cache;
 
-int kvm_async_pf_init(void)
+int kvm_async_pf_init(const char *cache_name)
 {
-	async_pf_cache = KMEM_CACHE(kvm_async_pf, 0);
+	char *full_cache_name;
+
+	full_cache_name = kasprintf(GFP_KERNEL, "%s_async_pf", cache_name);
+	if (!full_cache_name)
+		return -ENOMEM;
+
+	async_pf_cache = kmem_cache_create(full_cache_name,
+					   sizeof(struct kvm_async_pf), 0,
+					   SLAB_ACCOUNT, NULL);
+	kfree(full_cache_name);
 
 	if (!async_pf_cache)
 		return -ENOMEM;
diff --git a/virt/kvm/async_pf.h b/virt/kvm/async_pf.h
index 90d1a7d8c6de..829003899414 100644
--- a/virt/kvm/async_pf.h
+++ b/virt/kvm/async_pf.h
@@ -12,11 +12,11 @@
 #define __KVM_ASYNC_PF_H__
 
 #ifdef CONFIG_KVM_ASYNC_PF
-int kvm_async_pf_init(void);
+int kvm_async_pf_init(const char *cache_name);
 void kvm_async_pf_deinit(void);
 void kvm_async_pf_vcpu_init(struct kvm_vcpu *vcpu);
 #else
-#define kvm_async_pf_init() (0)
+#define kvm_async_pf_init(name) (0)
 #define kvm_async_pf_deinit() do {} while (0)
 #define kvm_async_pf_vcpu_init(C) do {} while (0)
 #endif
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 0d80730e8424..0b34477bf325 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -10,6 +10,7 @@
  *   Yaniv Kamay  <yaniv@qumranet.com>
  */
 
+#include "linux/sprintf.h"
 #include <kvm/iodev.h>
 
 #include <linux/kvm_host.h>
@@ -5597,9 +5598,7 @@ static struct file_operations kvm_chardev_ops = {
 };
 
 static struct miscdevice kvm_dev = {
-	KVM_MINOR,
-	"kvm",
-	&kvm_chardev_ops,
+	.fops = &kvm_chardev_ops,
 };
 
 #ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLING
@@ -6371,13 +6370,13 @@ static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
 	kfree(env);
 }
 
-static void kvm_init_debug(void)
+static void kvm_init_debug(const char *dev_name)
 {
 	const struct file_operations *fops;
 	const struct kvm_stats_desc *pdesc;
 	int i;
 
-	kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
+	kvm_debugfs_dir = debugfs_create_dir(dev_name, NULL);
 
 	for (i = 0; i < kvm_vm_stats_header.num_desc; ++i) {
 		pdesc = &kvm_vm_stats_desc[i];
@@ -6513,23 +6512,42 @@ void kvm_unregister_perf_callbacks(void)
 }
 #endif
 
-int kvm_init(unsigned vcpu_size, unsigned vcpu_align, struct module *module)
+int kvm_init(unsigned int vcpu_size, unsigned int vcpu_align, struct module *module)
 {
+	return kvm_init_with_dev(vcpu_size, vcpu_align, module, "kvm", KVM_MINOR);
+}
+
+int kvm_init_with_dev(unsigned int vcpu_size, unsigned int vcpu_align,
+		      struct module *module, const char *dev_name, int minor)
+{
+	char *cache_name;
 	int r;
 	int cpu;
 
+	kvm_dev.minor = minor;
+	kvm_dev.name = kstrdup_const(dev_name, GFP_KERNEL);
+	if (!kvm_dev.name)
+		return -ENOMEM;
+
 	/* A kmem cache lets us meet the alignment requirements of fx_save. */
 	if (!vcpu_align)
 		vcpu_align = __alignof__(struct kvm_vcpu);
+
+	r = -ENOMEM;
+	cache_name = kasprintf(GFP_KERNEL, "%s_vcpu", dev_name);
+	if (!cache_name)
+		goto err_dev_name;
 	kvm_vcpu_cache =
-		kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align,
+		kmem_cache_create_usercopy(cache_name, vcpu_size, vcpu_align,
 					   SLAB_ACCOUNT,
 					   offsetof(struct kvm_vcpu, arch),
 					   offsetofend(struct kvm_vcpu, stats_id)
 					   - offsetof(struct kvm_vcpu, arch),
 					   NULL);
+	kfree(cache_name);
+
 	if (!kvm_vcpu_cache)
-		return -ENOMEM;
+		goto err_dev_name;
 
 	for_each_possible_cpu(cpu) {
 		if (!alloc_cpumask_var_node(&per_cpu(cpu_kick_mask, cpu),
@@ -6543,7 +6561,7 @@ int kvm_init(unsigned vcpu_size, unsigned vcpu_align, struct module *module)
 	if (r)
 		goto err_irqfd;
 
-	r = kvm_async_pf_init();
+	r = kvm_async_pf_init(dev_name);
 	if (r)
 		goto err_async_pf;
 
@@ -6555,7 +6573,7 @@ int kvm_init(unsigned vcpu_size, unsigned vcpu_align, struct module *module)
 	kvm_preempt_ops.sched_in = kvm_sched_in;
 	kvm_preempt_ops.sched_out = kvm_sched_out;
 
-	kvm_init_debug();
+	kvm_init_debug(kvm_dev.name);
 
 	r = kvm_vfio_ops_init();
 	if (WARN_ON_ONCE(r))
@@ -6597,6 +6615,8 @@ int kvm_init(unsigned vcpu_size, unsigned vcpu_align, struct module *module)
 	for_each_possible_cpu(cpu)
 		free_cpumask_var(per_cpu(cpu_kick_mask, cpu));
 	kmem_cache_destroy(kvm_vcpu_cache);
+err_dev_name:
+	kfree_const(kvm_dev.name);
 	return r;
 }
 EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_init);
@@ -6622,5 +6642,8 @@ void kvm_exit(void)
 	kvm_vfio_ops_exit();
 	kvm_async_pf_deinit();
 	kvm_irqfd_exit();
+
+	kfree_const(kvm_dev.name);
+	kvm_dev.name = NULL;
 }
 EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_exit);
-- 
2.53.0