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KVM: x86/mmu: Refactor THP adjust to prep for changing query
Refactor transparent_hugepage_adjust() in preparation for walking the host page tables to identify hugepage mappings, initially for THP pages, and eventualy for HugeTLB and DAX-backed pages as well. The latter cases support 1gb pages, i.e. the adjustment logic needs access to the max allowed level. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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13c72c060f
commit
17eff01904
2 changed files with 23 additions and 24 deletions
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@ -3329,33 +3329,34 @@ static void direct_pte_prefetch(struct kvm_vcpu *vcpu, u64 *sptep)
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__direct_pte_prefetch(vcpu, sp, sptep);
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}
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static void transparent_hugepage_adjust(struct kvm_vcpu *vcpu,
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gfn_t gfn, kvm_pfn_t *pfnp,
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static void transparent_hugepage_adjust(struct kvm_vcpu *vcpu, gfn_t gfn,
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int max_level, kvm_pfn_t *pfnp,
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int *levelp)
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{
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kvm_pfn_t pfn = *pfnp;
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int level = *levelp;
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kvm_pfn_t mask;
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/*
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* Check if it's a transparent hugepage. If this would be an
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* hugetlbfs page, level wouldn't be set to
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* PT_PAGE_TABLE_LEVEL and there would be no adjustment done
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* here.
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*/
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if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn) &&
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!kvm_is_zone_device_pfn(pfn) && level == PT_PAGE_TABLE_LEVEL &&
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kvm_is_transparent_hugepage(pfn)) {
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unsigned long mask;
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if (max_level == PT_PAGE_TABLE_LEVEL || level > PT_PAGE_TABLE_LEVEL)
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return;
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if (is_error_noslot_pfn(pfn) || kvm_is_reserved_pfn(pfn) ||
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kvm_is_zone_device_pfn(pfn))
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return;
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if (!kvm_is_transparent_hugepage(pfn))
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return;
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level = PT_DIRECTORY_LEVEL;
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/*
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* mmu_notifier_retry() was successful and mmu_lock is held, so
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* the pmd can't be split from under us.
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*/
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*levelp = level = PT_DIRECTORY_LEVEL;
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*levelp = level;
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mask = KVM_PAGES_PER_HPAGE(level) - 1;
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VM_BUG_ON((gfn & mask) != (pfn & mask));
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*pfnp = pfn & ~mask;
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}
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}
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static void disallowed_hugepage_adjust(struct kvm_shadow_walk_iterator it,
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@ -3395,8 +3396,7 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t gpa, int write,
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if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root_hpa)))
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return RET_PF_RETRY;
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if (likely(max_level > PT_PAGE_TABLE_LEVEL))
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transparent_hugepage_adjust(vcpu, gfn, &pfn, &level);
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transparent_hugepage_adjust(vcpu, gfn, max_level, &pfn, &level);
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trace_kvm_mmu_spte_requested(gpa, level, pfn);
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for_each_shadow_entry(vcpu, gpa, it) {
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@ -688,8 +688,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gpa_t addr,
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gfn = gw->gfn | ((addr & PT_LVL_OFFSET_MASK(gw->level)) >> PAGE_SHIFT);
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base_gfn = gfn;
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if (max_level > PT_PAGE_TABLE_LEVEL)
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transparent_hugepage_adjust(vcpu, gw->gfn, &pfn, &hlevel);
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transparent_hugepage_adjust(vcpu, gw->gfn, max_level, &pfn, &hlevel);
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trace_kvm_mmu_spte_requested(addr, gw->level, pfn);
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