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Date: Tue, 2 Jun 2015 21:25:29 -0700
From: John Hubbard <jhubbard@...dia.com>
To: <j.glisse@...il.com>
CC: <akpm@...ux-foundation.org>, <linux-kernel@...r.kernel.org>,
<linux-mm@...ck.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
<joro@...tes.org>, Mel Gorman <mgorman@...e.de>,
"H. Peter Anvin" <hpa@...or.com>,
Peter Zijlstra <peterz@...radead.org>,
Andrea Arcangeli <aarcange@...hat.com>,
Johannes Weiner <jweiner@...hat.com>,
Larry Woodman <lwoodman@...hat.com>,
Rik van Riel <riel@...hat.com>,
Dave Airlie <airlied@...hat.com>,
Brendan Conoboy <blc@...hat.com>,
Joe Donohue <jdonohue@...hat.com>,
Duncan Poole <dpoole@...dia.com>,
Sherry Cheung <SCheung@...dia.com>,
Subhash Gutti <sgutti@...dia.com>,
Mark Hairgrove <mhairgrove@...dia.com>,
Lucien Dunning <ldunning@...dia.com>,
Cameron Buschardt <cabuschardt@...dia.com>,
Arvind Gopalakrishnan <arvindg@...dia.com>,
Haggai Eran <haggaie@...lanox.com>,
Shachar Raindel <raindel@...lanox.com>,
Liran Liss <liranl@...lanox.com>,
Roland Dreier <roland@...estorage.com>,
Ben Sander <ben.sander@....com>,
Greg Stoner <Greg.Stoner@....com>,
John Bridgman <John.Bridgman@....com>,
Michael Mantor <Michael.Mantor@....com>,
Paul Blinzer <Paul.Blinzer@....com>,
Laurent Morichetti <Laurent.Morichetti@....com>,
Alexander Deucher <Alexander.Deucher@....com>,
Oded Gabbay <Oded.Gabbay@....com>,
Jérôme Glisse <jglisse@...hat.com>
Subject: Re: [PATCH 03/36] mmu_notifier: pass page pointer to
mmu_notifier_invalidate_page()
On Thu, 21 May 2015, j.glisse@...il.com wrote:
> From: Jérôme Glisse <jglisse@...hat.com>
>
> Listener of mm event might not have easy way to get the struct page
> behind and address invalidated with mmu_notifier_invalidate_page()
s/behind and address/behind an address/
> function as this happens after the cpu page table have been clear/
> updated. This happens for instance if the listener is storing a dma
> mapping inside its secondary page table. To avoid complex reverse
> dma mapping lookup just pass along a pointer to the page being
> invalidated.
>
> Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
> ---
> drivers/infiniband/core/umem_odp.c | 1 +
> drivers/iommu/amd_iommu_v2.c | 1 +
> drivers/misc/sgi-gru/grutlbpurge.c | 1 +
> drivers/xen/gntdev.c | 1 +
> include/linux/mmu_notifier.h | 6 +++++-
> mm/mmu_notifier.c | 3 ++-
> mm/rmap.c | 4 ++--
> virt/kvm/kvm_main.c | 1 +
> 8 files changed, 14 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c
> index 8f7f845..d10dd88 100644
> --- a/drivers/infiniband/core/umem_odp.c
> +++ b/drivers/infiniband/core/umem_odp.c
> @@ -166,6 +166,7 @@ static int invalidate_page_trampoline(struct ib_umem *item, u64 start,
> static void ib_umem_notifier_invalidate_page(struct mmu_notifier *mn,
> struct mm_struct *mm,
> unsigned long address,
> + struct page *page,
> enum mmu_event event)
> {
> struct ib_ucontext *context = container_of(mn, struct ib_ucontext, mn);
> diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
> index 4aa4de6..de3c540 100644
> --- a/drivers/iommu/amd_iommu_v2.c
> +++ b/drivers/iommu/amd_iommu_v2.c
> @@ -385,6 +385,7 @@ static int mn_clear_flush_young(struct mmu_notifier *mn,
> static void mn_invalidate_page(struct mmu_notifier *mn,
> struct mm_struct *mm,
> unsigned long address,
> + struct page *page,
> enum mmu_event event)
> {
> __mn_flush_page(mn, address);
> diff --git a/drivers/misc/sgi-gru/grutlbpurge.c b/drivers/misc/sgi-gru/grutlbpurge.c
> index 44b41b7..c7659b76 100644
> --- a/drivers/misc/sgi-gru/grutlbpurge.c
> +++ b/drivers/misc/sgi-gru/grutlbpurge.c
> @@ -250,6 +250,7 @@ static void gru_invalidate_range_end(struct mmu_notifier *mn,
>
> static void gru_invalidate_page(struct mmu_notifier *mn, struct mm_struct *mm,
> unsigned long address,
> + struct page *page,
> enum mmu_event event)
> {
> struct gru_mm_struct *gms = container_of(mn, struct gru_mm_struct,
> diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
> index 0e8aa12..90693ce 100644
> --- a/drivers/xen/gntdev.c
> +++ b/drivers/xen/gntdev.c
> @@ -485,6 +485,7 @@ static void mn_invl_range_start(struct mmu_notifier *mn,
> static void mn_invl_page(struct mmu_notifier *mn,
> struct mm_struct *mm,
> unsigned long address,
> + struct page *page,
> enum mmu_event event)
> {
> struct mmu_notifier_range range;
> diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
> index ada3ed1..283ad26 100644
> --- a/include/linux/mmu_notifier.h
> +++ b/include/linux/mmu_notifier.h
> @@ -172,6 +172,7 @@ struct mmu_notifier_ops {
> void (*invalidate_page)(struct mmu_notifier *mn,
> struct mm_struct *mm,
> unsigned long address,
> + struct page *page,
> enum mmu_event event);
>
> /*
> @@ -290,6 +291,7 @@ extern void __mmu_notifier_change_pte(struct mm_struct *mm,
> enum mmu_event event);
> extern void __mmu_notifier_invalidate_page(struct mm_struct *mm,
> unsigned long address,
> + struct page *page,
> enum mmu_event event);
> extern void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
> struct mmu_notifier_range *range);
> @@ -338,10 +340,11 @@ static inline void mmu_notifier_change_pte(struct mm_struct *mm,
>
> static inline void mmu_notifier_invalidate_page(struct mm_struct *mm,
> unsigned long address,
> + struct page *page,
> enum mmu_event event)
> {
> if (mm_has_notifiers(mm))
> - __mmu_notifier_invalidate_page(mm, address, event);
> + __mmu_notifier_invalidate_page(mm, address, page, event);
> }
>
> static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm,
> @@ -492,6 +495,7 @@ static inline void mmu_notifier_change_pte(struct mm_struct *mm,
>
> static inline void mmu_notifier_invalidate_page(struct mm_struct *mm,
> unsigned long address,
> + struct page *page,
> enum mmu_event event)
> {
> }
> diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
> index 294ebc4..2ff6d43 100644
> --- a/mm/mmu_notifier.c
> +++ b/mm/mmu_notifier.c
> @@ -160,6 +160,7 @@ void __mmu_notifier_change_pte(struct mm_struct *mm,
>
> void __mmu_notifier_invalidate_page(struct mm_struct *mm,
> unsigned long address,
> + struct page *page,
> enum mmu_event event)
> {
> struct mmu_notifier *mn;
> @@ -168,7 +169,7 @@ void __mmu_notifier_invalidate_page(struct mm_struct *mm,
> id = srcu_read_lock(&srcu);
> hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) {
> if (mn->ops->invalidate_page)
> - mn->ops->invalidate_page(mn, mm, address, event);
> + mn->ops->invalidate_page(mn, mm, address, page, event);
> }
> srcu_read_unlock(&srcu, id);
> }
> diff --git a/mm/rmap.c b/mm/rmap.c
> index 74c51e0..4563edc 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -915,7 +915,7 @@ static int page_mkclean_one(struct page *page, struct vm_area_struct *vma,
> pte_unmap_unlock(pte, ptl);
>
> if (ret) {
> - mmu_notifier_invalidate_page(mm, address, MMU_WRITE_BACK);
> + mmu_notifier_invalidate_page(mm, address, page, MMU_WRITE_BACK);
> (*cleaned)++;
> }
> out:
> @@ -1338,7 +1338,7 @@ discard:
> out_unmap:
> pte_unmap_unlock(pte, ptl);
> if (ret != SWAP_FAIL && !(flags & TTU_MUNLOCK))
> - mmu_notifier_invalidate_page(mm, address, MMU_MIGRATE);
> + mmu_notifier_invalidate_page(mm, address, page, MMU_MIGRATE);
> out:
> return ret;
>
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 6177c56..62978ed 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -261,6 +261,7 @@ static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
> static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
> struct mm_struct *mm,
> unsigned long address,
> + struct page *page,
> enum mmu_event event)
> {
> struct kvm *kvm = mmu_notifier_to_kvm(mn);
> --
> 1.9.3
>
>
This seems like a reasonable thing to do, and I didn't spot any problems
in the patch.
thanks,
John H.
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