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KVM: Make coalesced mmio use a device per zone

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This patch changes coalesced mmio to create one mmio device per
zone instead of handling all zones in one device.

Doing so enables us to take advantage of existing locking and prevents
a race condition between coalesced mmio registration/unregistration
and lookups.

Suggested-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Sasha Levin
2011-07-20 20:59:00 +03:00
committed by Avi Kivity
parent 8c3ba334f8
commit 2b3c246a68
3 changed files with 55 additions and 79 deletions
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5
include/linux/kvm_host.h
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@@ -63,7 +63,7 @@ extern struct kmem_cache *kvm_vcpu_cache;
*/
struct kvm_io_bus {
int dev_count;
#define NR_IOBUS_DEVS 200
#define NR_IOBUS_DEVS 300
struct kvm_io_device *devs[NR_IOBUS_DEVS];
};
@@ -256,8 +256,9 @@ struct kvm {
struct kvm_arch arch;
atomic_t users_count;
#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
struct kvm_coalesced_mmio_dev *coalesced_mmio_dev;
struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
spinlock_t ring_lock;
struct list_head coalesced_zones;
#endif
struct mutex irq_lock;