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Subject[PATCH 20/40] KVM: Simplify coalesced mmio initialization
Date
- add destructor function
- move related allocation into constructor
- add stubs for !CONFIG_KVM_MMIO

Signed-off-by: Avi Kivity <avi@redhat.com>
---
virt/kvm/coalesced_mmio.c | 25 +++++++++++++++++++++++--
virt/kvm/coalesced_mmio.h | 10 ++++++++++
virt/kvm/kvm_main.c | 7 +------
3 files changed, 34 insertions(+), 8 deletions(-)

diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index 04d69cd..d68e6c6 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -92,11 +92,19 @@ static const struct kvm_io_device_ops coalesced_mmio_ops = {
int kvm_coalesced_mmio_init(struct kvm *kvm)
{
struct kvm_coalesced_mmio_dev *dev;
+ struct page *page;
int ret;

+ ret = -ENOMEM;
+ page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!page)
+ goto out_err;
+ kvm->coalesced_mmio_ring = page_address(page);
+
+ ret = -ENOMEM;
dev = kzalloc(sizeof(struct kvm_coalesced_mmio_dev), GFP_KERNEL);
if (!dev)
- return -ENOMEM;
+ goto out_free_page;
spin_lock_init(&dev->lock);
kvm_iodevice_init(&dev->dev, &coalesced_mmio_ops);
dev->kvm = kvm;
@@ -104,11 +112,24 @@ int kvm_coalesced_mmio_init(struct kvm *kvm)

ret = kvm_io_bus_register_dev(kvm, &kvm->mmio_bus, &dev->dev);
if (ret < 0)
- kfree(dev);
+ goto out_free_dev;
+
+ return ret;

+out_free_dev:
+ kfree(dev);
+out_free_page:
+ __free_page(page);
+out_err:
return ret;
}

+void kvm_coalesced_mmio_free(struct kvm *kvm)
+{
+ if (kvm->coalesced_mmio_ring)
+ free_page((unsigned long)kvm->coalesced_mmio_ring);
+}
+
int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm,
struct kvm_coalesced_mmio_zone *zone)
{
diff --git a/virt/kvm/coalesced_mmio.h b/virt/kvm/coalesced_mmio.h
index e703346..8a5959e 100644
--- a/virt/kvm/coalesced_mmio.h
+++ b/virt/kvm/coalesced_mmio.h
@@ -10,6 +10,8 @@
*
*/

+#ifdef CONFIG_KVM_MMIO
+
#define KVM_COALESCED_MMIO_ZONE_MAX 100

struct kvm_coalesced_mmio_dev {
@@ -21,9 +23,17 @@ struct kvm_coalesced_mmio_dev {
};

int kvm_coalesced_mmio_init(struct kvm *kvm);
+void kvm_coalesced_mmio_free(struct kvm *kvm);
int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm,
struct kvm_coalesced_mmio_zone *zone);
int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm,
struct kvm_coalesced_mmio_zone *zone);

+#else
+
+static inline int kvm_coalesced_mmio_init(struct kvm *kvm) { return 0; }
+static inline void kvm_coalesced_mmio_free(struct kvm *kvm) { }
+
+#endif
+
#endif
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index c10d117..bc23b8e 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -51,9 +51,7 @@
#include <asm/pgtable.h>
#include <asm-generic/bitops/le.h>

-#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
#include "coalesced_mmio.h"
-#endif

#define CREATE_TRACE_POINTS
#include <trace/events/kvm.h>
@@ -468,10 +466,7 @@ static void kvm_destroy_vm(struct kvm *kvm)
kvm_free_irq_routing(kvm);
kvm_io_bus_destroy(&kvm->pio_bus);
kvm_io_bus_destroy(&kvm->mmio_bus);
-#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
- if (kvm->coalesced_mmio_ring != NULL)
- free_page((unsigned long)kvm->coalesced_mmio_ring);
-#endif
+ kvm_coalesced_mmio_free(kvm);
#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
#else
--
1.6.5.3


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