diff options
author | Laurent Vivier <Laurent.Vivier@bull.net> | 2007-08-30 14:56:21 +0200 |
---|---|---|
committer | Avi Kivity <avi@qumranet.com> | 2007-10-13 10:18:27 +0200 |
commit | 0d8d2bd4f20c8a2a254b4fe3bc114f12214a6d73 (patch) | |
tree | ca8234bdcb71b7cc0955ef89ae5b028d19ca709e /drivers/kvm/kvm_main.c | |
parent | 1747fb71fd7c9389696e91f354d2f841b5c85790 (diff) | |
download | op-kernel-dev-0d8d2bd4f20c8a2a254b4fe3bc114f12214a6d73.zip op-kernel-dev-0d8d2bd4f20c8a2a254b4fe3bc114f12214a6d73.tar.gz |
KVM: Simplify memory allocation
The mutex->splinlock convertion alllows us to make some code simplifications.
As we can keep the lock longer, we don't have to release it and then
have to check if the environment has not been modified before re-taking it. We
can remove kvm->busy and kvm->memory_config_version.
Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/kvm_main.c')
-rw-r--r-- | drivers/kvm/kvm_main.c | 38 |
1 files changed, 3 insertions, 35 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 9dffbbe..8da13a4 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -679,7 +679,6 @@ static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, unsigned long i; struct kvm_memory_slot *memslot; struct kvm_memory_slot old, new; - int memory_config_version; r = -EINVAL; /* General sanity checks */ @@ -699,10 +698,8 @@ static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, if (!npages) mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; -raced: mutex_lock(&kvm->lock); - memory_config_version = kvm->memory_config_version; new = old = *memslot; new.base_gfn = base_gfn; @@ -725,11 +722,6 @@ raced: (base_gfn >= s->base_gfn + s->npages))) goto out_unlock; } - /* - * Do memory allocations outside lock. memory_config_version will - * detect any races. - */ - mutex_unlock(&kvm->lock); /* Deallocate if slot is being removed */ if (!npages) @@ -746,14 +738,14 @@ raced: new.phys_mem = vmalloc(npages * sizeof(struct page *)); if (!new.phys_mem) - goto out_free; + goto out_unlock; memset(new.phys_mem, 0, npages * sizeof(struct page *)); for (i = 0; i < npages; ++i) { new.phys_mem[i] = alloc_page(GFP_HIGHUSER | __GFP_ZERO); if (!new.phys_mem[i]) - goto out_free; + goto out_unlock; set_page_private(new.phys_mem[i],0); } } @@ -764,27 +756,14 @@ raced: new.dirty_bitmap = vmalloc(dirty_bytes); if (!new.dirty_bitmap) - goto out_free; + goto out_unlock; memset(new.dirty_bitmap, 0, dirty_bytes); } - mutex_lock(&kvm->lock); - - if (memory_config_version != kvm->memory_config_version) { - mutex_unlock(&kvm->lock); - kvm_free_physmem_slot(&new, &old); - goto raced; - } - - r = -EAGAIN; - if (kvm->busy) - goto out_unlock; - if (mem->slot >= kvm->nmemslots) kvm->nmemslots = mem->slot + 1; *memslot = new; - ++kvm->memory_config_version; kvm_mmu_slot_remove_write_access(kvm, mem->slot); kvm_flush_remote_tlbs(kvm); @@ -796,7 +775,6 @@ raced: out_unlock: mutex_unlock(&kvm->lock); -out_free: kvm_free_physmem_slot(&new, &old); out: return r; @@ -815,12 +793,6 @@ static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, mutex_lock(&kvm->lock); - /* - * Prevent changes to guest memory configuration even while the lock - * is not taken. - */ - ++kvm->busy; - mutex_unlock(&kvm->lock); r = -EINVAL; if (log->slot >= KVM_MEMORY_SLOTS) goto out; @@ -841,18 +813,14 @@ static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, /* If nothing is dirty, don't bother messing with page tables. */ if (any) { - mutex_lock(&kvm->lock); kvm_mmu_slot_remove_write_access(kvm, log->slot); kvm_flush_remote_tlbs(kvm); memset(memslot->dirty_bitmap, 0, n); - mutex_unlock(&kvm->lock); } r = 0; out: - mutex_lock(&kvm->lock); - --kvm->busy; mutex_unlock(&kvm->lock); return r; } |