KVM: MMU: increase per-vcpu rmap cache alloc size

The page fault path can use two rmap_desc structures, if:

- walk_addr's dirty pte update allocates one rmap_desc.
- mmu_lock is dropped, sptes are zapped resulting in rmap_desc being
freed.
- fetch->mmu_set_spte allocates another rmap_desc.

Increase to 4 for safety.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 2a5e64881d9b..f1983d9477cd 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -314,7 +314,7 @@ static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu)
         if (r)
                 goto out;
         r = mmu_topup_memory_cache(&vcpu->arch.mmu_rmap_desc_cache,
-                                   rmap_desc_cache, 1);
+                                   rmap_desc_cache, 4);
         if (r)
                 goto out;
         r = mmu_topup_memory_cache_page(&vcpu->arch.mmu_page_cache, 8);