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Revert "KVM: MMU: reclaim the zapped-obsolete page first"

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Unwinding optimizations related to obsolete pages is a step towards
removing x86 KVM's fast invalidate mechanism, i.e. this is one part of
a revert all patches from the series that introduced the mechanism[1].

This reverts commit 365c886860.

[1] https://lkml.kernel.org/r/1369960590-14138-1-git-send-email-xiaoguangrong@linux.vnet.ibm.com

Cc: Xiao Guangrong <guangrong.xiao@gmail.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson
2019-02-05 13:01:26 -08:00
committed by Paolo Bonzini
parent 5ff0568374
commit 52d5dedc79
3 changed files with 4 additions and 19 deletions
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21
arch/x86/kvm/mmu.c
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@@ -5858,6 +5858,7 @@ EXPORT_SYMBOL_GPL(kvm_mmu_slot_set_dirty);
static void kvm_zap_obsolete_pages(struct kvm *kvm)
{
struct kvm_mmu_page *sp, *node;
LIST_HEAD(invalid_list);
int batch = 0;
restart:
@@ -5890,8 +5891,7 @@ restart:
goto restart;
}
ret = kvm_mmu_prepare_zap_page(kvm, sp,
&kvm->arch.zapped_obsolete_pages);
ret = kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list);
batch += ret;
if (ret)
@@ -5902,7 +5902,7 @@ restart:
* Should flush tlb before free page tables since lockless-walking
* may use the pages.
*/
kvm_mmu_commit_zap_page(kvm, &kvm->arch.zapped_obsolete_pages);
kvm_mmu_commit_zap_page(kvm, &invalid_list);
}
/*
@@ -5935,11 +5935,6 @@ void kvm_mmu_invalidate_zap_all_pages(struct kvm *kvm)
spin_unlock(&kvm->mmu_lock);
}
static bool kvm_has_zapped_obsolete_pages(struct kvm *kvm)
{
return unlikely(!list_empty_careful(&kvm->arch.zapped_obsolete_pages));
}
static void kvm_mmu_zap_mmio_sptes(struct kvm *kvm)
{
struct kvm_mmu_page *sp, *node;
@@ -6011,24 +6006,16 @@ mmu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
* want to shrink a VM that only started to populate its MMU
* anyway.
*/
if (!kvm->arch.n_used_mmu_pages &&
!kvm_has_zapped_obsolete_pages(kvm))
if (!kvm->arch.n_used_mmu_pages)
continue;
idx = srcu_read_lock(&kvm->srcu);
spin_lock(&kvm->mmu_lock);
if (kvm_has_zapped_obsolete_pages(kvm)) {
kvm_mmu_commit_zap_page(kvm,
&kvm->arch.zapped_obsolete_pages);
goto unlock;
}
if (prepare_zap_oldest_mmu_page(kvm, &invalid_list))
freed++;
kvm_mmu_commit_zap_page(kvm, &invalid_list);
unlock:
spin_unlock(&kvm->mmu_lock);
srcu_read_unlock(&kvm->srcu, idx);