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KVM: remove the usage of the mmap_sem for the protection of the memory slots.

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This patch replaces the mmap_sem lock for the memory slots with a new
kvm private lock, it is needed beacuse untill now there were cases where
kvm accesses user memory while holding the mmap semaphore.

Signed-off-by: Izik Eidus <izike@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Izik Eidus 2008-02-10 18:04:15 +02:00 • committed by Avi Kivity
commit 72dc67a696
6 changed files with 75 additions and 40 deletions
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1
include/linux/kvm_host.h
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@ -107,6 +107,7 @@ struct kvm_memory_slot {
struct kvm {
struct mutex lock; /* protects the vcpus array and APIC accesses */
spinlock_t mmu_lock;
struct rw_semaphore slots_lock;
struct mm_struct *mm; /* userspace tied to this vm */
int nmemslots;
struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +