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KVM: MMU: fold tlb flush judgement into mmu_spte_update
mmu_spte_update() is the common function, we can easily audit the path Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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6e7d035407
1 changed files with 20 additions and 13 deletions
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@ -479,15 +479,24 @@ static void mmu_spte_set(u64 *sptep, u64 new_spte)
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/* Rules for using mmu_spte_update:
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* Update the state bits, it means the mapped pfn is not changged.
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*
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* Whenever we overwrite a writable spte with a read-only one we
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* should flush remote TLBs. Otherwise rmap_write_protect
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* will find a read-only spte, even though the writable spte
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* might be cached on a CPU's TLB, the return value indicates this
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* case.
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*/
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static void mmu_spte_update(u64 *sptep, u64 new_spte)
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static bool mmu_spte_update(u64 *sptep, u64 new_spte)
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{
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u64 mask, old_spte = *sptep;
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bool ret = false;
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WARN_ON(!is_rmap_spte(new_spte));
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if (!is_shadow_present_pte(old_spte))
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return mmu_spte_set(sptep, new_spte);
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if (!is_shadow_present_pte(old_spte)) {
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mmu_spte_set(sptep, new_spte);
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return ret;
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}
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new_spte |= old_spte & shadow_dirty_mask;
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@ -500,13 +509,18 @@ static void mmu_spte_update(u64 *sptep, u64 new_spte)
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else
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old_spte = __update_clear_spte_slow(sptep, new_spte);
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if (is_writable_pte(old_spte) && !is_writable_pte(new_spte))
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ret = true;
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if (!shadow_accessed_mask)
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return;
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return ret;
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if (spte_is_bit_cleared(old_spte, new_spte, shadow_accessed_mask))
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kvm_set_pfn_accessed(spte_to_pfn(old_spte));
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if (spte_is_bit_cleared(old_spte, new_spte, shadow_dirty_mask))
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kvm_set_pfn_dirty(spte_to_pfn(old_spte));
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return ret;
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}
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/*
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@ -2268,7 +2282,7 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
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gfn_t gfn, pfn_t pfn, bool speculative,
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bool can_unsync, bool host_writable)
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{
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u64 spte, entry = *sptep;
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u64 spte;
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int ret = 0;
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if (set_mmio_spte(sptep, gfn, pfn, pte_access))
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@ -2346,14 +2360,7 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
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mark_page_dirty(vcpu->kvm, gfn);
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set_pte:
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mmu_spte_update(sptep, spte);
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/*
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* If we overwrite a writable spte with a read-only one we
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* should flush remote TLBs. Otherwise rmap_write_protect
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* will find a read-only spte, even though the writable spte
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* might be cached on a CPU's TLB.
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*/
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if (is_writable_pte(entry) && !is_writable_pte(*sptep))
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if (mmu_spte_update(sptep, spte))
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kvm_flush_remote_tlbs(vcpu->kvm);
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done:
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return ret;
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