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SubjectRe: [PATCH v4 2/2] kvm: Use huge pages for DAX-backed files
On Wed, Dec 11, 2019 at 04:32:07PM -0500, Barret Rhoden wrote:
> This change allows KVM to map DAX-backed files made of huge pages with
> huge mappings in the EPT/TDP.
>
> DAX pages are not PageTransCompound. The existing check is trying to
> determine if the mapping for the pfn is a huge mapping or not. For
> non-DAX maps, e.g. hugetlbfs, that means checking PageTransCompound.
> For DAX, we can check the page table itself.
>
> Note that KVM already faulted in the page (or huge page) in the host's
> page table, and we hold the KVM mmu spinlock. We grabbed that lock in
> kvm_mmu_notifier_invalidate_range_end, before checking the mmu seq.
>
> Signed-off-by: Barret Rhoden <brho@google.com>
> ---
> arch/x86/kvm/mmu/mmu.c | 36 ++++++++++++++++++++++++++++++++----
> 1 file changed, 32 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index 6f92b40d798c..cd07bc4e595f 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -3384,6 +3384,35 @@ static int kvm_handle_bad_page(struct kvm_vcpu *vcpu, gfn_t gfn, kvm_pfn_t pfn)
> return -EFAULT;
> }
>
> +static bool pfn_is_huge_mapped(struct kvm *kvm, gfn_t gfn, kvm_pfn_t pfn)
> +{
> + struct page *page = pfn_to_page(pfn);
> + unsigned long hva;
> +
> + if (!is_zone_device_page(page))
> + return PageTransCompoundMap(page);
> +
> + /*
> + * DAX pages do not use compound pages. The page should have already
> + * been mapped into the host-side page table during try_async_pf(), so
> + * we can check the page tables directly.
> + */
> + hva = gfn_to_hva(kvm, gfn);
> + if (kvm_is_error_hva(hva))
> + return false;
> +
> + /*
> + * Our caller grabbed the KVM mmu_lock with a successful
> + * mmu_notifier_retry, so we're safe to walk the page table.
> + */
> + switch (dev_pagemap_mapping_shift(hva, current->mm)) {
> + case PMD_SHIFT:
> + case PUD_SIZE:

I assume this means DAX can have 1GB pages? I ask because KVM's THP logic
has historically relied on THP only supporting 2MB. I cleaned this up in
a recent series[*], which is in kvm/queue, but I obviously didn't actually
test whether or not KVM would correctly handle 1GB non-hugetlbfs pages.

The easiest thing is probably to rebase on kvm/queue. You'll need to do
that anyways, and I suspect doing so will help shake out any hiccups.

[*] https://lkml.kernel.org/r/20191206235729.29263-1-sean.j.christopherson@intel.com

> + return true;
> + }
> + return false;
> +}
> +
> static void transparent_hugepage_adjust(struct kvm_vcpu *vcpu,
> gfn_t gfn, kvm_pfn_t *pfnp,
> int *levelp)
> @@ -3398,8 +3427,8 @@ static void transparent_hugepage_adjust(struct kvm_vcpu *vcpu,
> * here.
> */
> if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn) &&
> - !kvm_is_zone_device_pfn(pfn) && level == PT_PAGE_TABLE_LEVEL &&
> - PageTransCompoundMap(pfn_to_page(pfn)) &&
> + level == PT_PAGE_TABLE_LEVEL &&
> + pfn_is_huge_mapped(vcpu->kvm, gfn, pfn) &&
> !mmu_gfn_lpage_is_disallowed(vcpu, gfn, PT_DIRECTORY_LEVEL)) {
> unsigned long mask;
> /*
> @@ -6015,8 +6044,7 @@ static bool kvm_mmu_zap_collapsible_spte(struct kvm *kvm,
> * mapping if the indirect sp has level = 1.
> */
> if (sp->role.direct && !kvm_is_reserved_pfn(pfn) &&
> - !kvm_is_zone_device_pfn(pfn) &&
> - PageTransCompoundMap(pfn_to_page(pfn))) {
> + pfn_is_huge_mapped(kvm, sp->gfn, pfn)) {
> pte_list_remove(rmap_head, sptep);
>
> if (kvm_available_flush_tlb_with_range())
> --
> 2.24.0.525.g8f36a354ae-goog
>

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