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KVM: x86: remove check on nr_mmu_pages in kvm_arch_commit_memory_region()

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* nr_mmu_pages would be non-zero only if kvm->arch.n_requested_mmu_pages is
  non-zero.

* nr_mmu_pages is always non-zero, since kvm_mmu_calculate_mmu_pages()
  never return zero.

Based on these two reasons, we can merge the two *if* clause and use the
return value from kvm_mmu_calculate_mmu_pages() directly. This simplify
the code and also eliminate the possibility for reader to believe
nr_mmu_pages would be zero.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wei Yang 2018-09-27 08:31:26 +08:00 committed by Paolo Bonzini
parent 711eff3a8f
commit 4d66623cfb
3 changed files with 4 additions and 8 deletions
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2
arch/x86/include/asm/kvm_host.h
View file

@ -1254,7 +1254,7 @@ void kvm_mmu_clear_dirty_pt_masked(struct kvm *kvm,
gfn_t gfn_offset, unsigned long mask);
void kvm_mmu_zap_all(struct kvm *kvm);
void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm, u64 gen);
unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
unsigned int kvm_mmu_calculate_default_mmu_pages(struct kvm *kvm);
void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3);

2
arch/x86/kvm/mmu.c
View file

@ -6028,7 +6028,7 @@ out:
/*
* Calculate mmu pages needed for kvm.
*/
unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm)
unsigned int kvm_mmu_calculate_default_mmu_pages(struct kvm *kvm)
{
unsigned int nr_mmu_pages;
unsigned int nr_pages = 0;

8
arch/x86/kvm/x86.c
View file

@ -9429,13 +9429,9 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
const struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
int nr_mmu_pages = 0;
if (!kvm->arch.n_requested_mmu_pages)
nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
if (nr_mmu_pages)
kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
kvm_mmu_change_mmu_pages(kvm,
kvm_mmu_calculate_default_mmu_pages(kvm));
/*
* Dirty logging tracks sptes in 4k granularity, meaning that large