[PATCH v5.5 19/30] KVM: x86: Don't call kvm_mmu_change_mmu_pages() if the count hasn't changed
From: Sean Christopherson <seanjc@google.com>
Date: 2021-11-04 00:28:59
Also in:
kvm, kvm-riscv, kvmarm, linux-mips, linux-riscv, lkml
Subsystem:
kernel virtual machine for x86 (kvm/x86), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Sean Christopherson, Paolo Bonzini, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
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. Reviewed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Maciej S. Szmigiero <redacted> Signed-off-by: Sean Christopherson <seanjc@google.com> --- arch/x86/kvm/x86.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 80183f7eadeb..4b0cb7390902 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c@@ -11836,7 +11836,8 @@ 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));
--
2.33.1.1089.g2158813163f-goog
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