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KVM: x86: Don't call kvm_mmu_change_mmu_pages() if the count hasn't changed

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There is no point in calling kvm_mmu_change_mmu_pages() for memslot
operations that don't change the total page count, so do it just for
KVM_MR_CREATE and KVM_MR_DELETE.

Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Message-Id: <9e56b7616a11f5654e4ab486b3237366b7ba9f2a.1638817640.git.maciej.szmigiero@oracle.com>
This commit is contained in:
Maciej S. Szmigiero 2021-12-06 20:54:23 +01:00 committed by Paolo Bonzini
parent 7cd08553ab
commit e0c2b6338a
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/x86.c
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@ -11783,7 +11783,8 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
const struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
if (!kvm->arch.n_requested_mmu_pages)
if (!kvm->arch.n_requested_mmu_pages &&
(change == KVM_MR_CREATE || change == KVM_MR_DELETE))
kvm_mmu_change_mmu_pages(kvm,
kvm_mmu_calculate_default_mmu_pages(kvm));