From: Yan Zhao <yan.y.zhao@intel.com>
To: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Zhenyu Wang <zhenyuw@linux.intel.com>,
Zhi Wang <zhi.a.wang@intel.com>, <kvm@vger.kernel.org>,
<intel-gvt-dev@lists.freedesktop.org>,
<intel-gfx@lists.freedesktop.org>, <linux-kernel@vger.kernel.org>,
Ben Gardon <bgardon@google.com>
Subject: Re: [PATCH v2 06/27] drm/i915/gvt: Put the page reference obtained by KVM's gfn_to_pfn()
Date: Fri, 17 Mar 2023 14:18:54 +0800 [thread overview]
Message-ID: <ZBQGTjKqXJT4U7fj@yzhao56-desk.sh.intel.com> (raw)
In-Reply-To: <20230311002258.852397-7-seanjc@google.com>
Reviewed-by: Yan Zhao <yan.y.zhao@intel.com>
On Fri, Mar 10, 2023 at 04:22:37PM -0800, Sean Christopherson wrote:
> Put the struct page reference acquired by gfn_to_pfn(), KVM's API is that
> the caller is ultimately responsible for dropping any reference.
>
> Note, kvm_release_pfn_clean() ensures the pfn is actually a refcounted
> struct page before trying to put any references.
>
> Fixes: b901b252b6cf ("drm/i915/gvt: Add 2M huge gtt support")
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
> drivers/gpu/drm/i915/gvt/gtt.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
> index d59c7ab9d224..15848b041a0d 100644
> --- a/drivers/gpu/drm/i915/gvt/gtt.c
> +++ b/drivers/gpu/drm/i915/gvt/gtt.c
> @@ -1160,6 +1160,7 @@ static int is_2MB_gtt_possible(struct intel_vgpu *vgpu,
> unsigned long gfn = ops->get_pfn(entry);
> kvm_pfn_t pfn;
> int max_level;
> + int ret;
>
> if (!HAS_PAGE_SIZES(vgpu->gvt->gt->i915, I915_GTT_PAGE_SIZE_2M))
> return 0;
> @@ -1179,7 +1180,9 @@ static int is_2MB_gtt_possible(struct intel_vgpu *vgpu,
> if (!pfn_valid(pfn))
> return -EINVAL;
>
> - return PageTransHuge(pfn_to_page(pfn));
> + ret = PageTransHuge(pfn_to_page(pfn));
> + kvm_release_pfn_clean(pfn);
> + return ret;
> }
>
> static int split_2MB_gtt_entry(struct intel_vgpu *vgpu,
> --
> 2.40.0.rc1.284.g88254d51c5-goog
>
next prev parent reply other threads:[~2023-03-17 6:43 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-11 0:22 [PATCH v2 00/27] drm/i915/gvt: KVM: KVMGT fixes and page-track cleanups Sean Christopherson
2023-03-11 0:22 ` [PATCH v2 01/27] drm/i915/gvt: Verify pfn is "valid" before dereferencing "struct page" Sean Christopherson
2023-03-13 15:37 ` Wang, Wei W
2023-03-15 18:13 ` [Intel-gfx] " Andrzej Hajda
2023-03-15 19:23 ` Sean Christopherson
2023-03-17 4:20 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 02/27] KVM: x86/mmu: Factor out helper to get max mapping size of a memslot Sean Christopherson
2023-03-13 15:37 ` Wang, Wei W
2023-03-11 0:22 ` [PATCH v2 03/27] drm/i915/gvt: remove interface intel_gvt_is_valid_gfn Sean Christopherson
2023-03-17 4:26 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 04/27] drm/i915/gvt: Incorporate KVM memslot info into check for 2MiB GTT entry Sean Christopherson
2023-03-14 3:09 ` Yan Zhao
2023-03-14 17:13 ` Sean Christopherson
2023-03-11 0:22 ` [PATCH v2 05/27] drm/i915/gvt: Verify VFIO-pinned page is THP when shadowing 2M gtt entry Sean Christopherson
2023-03-17 5:33 ` Yan Zhao
2023-05-04 20:41 ` Sean Christopherson
2023-05-06 6:35 ` Yan Zhao
2023-05-06 10:57 ` Yan Zhao
2023-05-08 14:05 ` Sean Christopherson
2023-03-11 0:22 ` [PATCH v2 06/27] drm/i915/gvt: Put the page reference obtained by KVM's gfn_to_pfn() Sean Christopherson
2023-03-17 6:18 ` Yan Zhao [this message]
2023-03-11 0:22 ` [PATCH v2 07/27] drm/i915/gvt: Don't rely on KVM's gfn_to_pfn() to query possible 2M GTT Sean Christopherson
2023-03-17 5:37 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 08/27] drm/i915/gvt: Use an "unsigned long" to iterate over memslot gfns Sean Christopherson
2023-03-17 6:19 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 09/27] drm/i915/gvt: Drop unused helper intel_vgpu_reset_gtt() Sean Christopherson
2023-03-17 6:20 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 10/27] drm/i915/gvt: Protect gfn hash table with vgpu_lock Sean Christopherson
2023-03-17 6:21 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 11/27] KVM: x86/mmu: Don't rely on page-track mechanism to flush on memslot change Sean Christopherson
2023-03-15 1:08 ` Yan Zhao
2023-03-15 15:32 ` Sean Christopherson
2023-03-11 0:22 ` [PATCH v2 12/27] KVM: x86/mmu: Don't bounce through page-track mechanism for guest PTEs Sean Christopherson
2023-03-17 6:37 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 13/27] KVM: drm/i915/gvt: Drop @vcpu from KVM's ->track_write() hook Sean Christopherson
2023-03-17 7:28 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 14/27] KVM: x86: Reject memslot MOVE operations if KVMGT is attached Sean Christopherson
2023-03-15 8:03 ` Yan Zhao
2023-03-15 15:43 ` Sean Christopherson
2023-03-16 9:27 ` Yan Zhao
2023-03-17 7:29 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 15/27] drm/i915/gvt: Don't bother removing write-protection on to-be-deleted slot Sean Christopherson
2023-03-17 7:30 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 16/27] KVM: x86: Add a new page-track hook to handle memslot deletion Sean Christopherson
2023-03-17 7:43 ` Yan Zhao
2023-03-17 16:20 ` Sean Christopherson
2023-03-11 0:22 ` [PATCH v2 17/27] drm/i915/gvt: switch from ->track_flush_slot() to ->track_remove_region() Sean Christopherson
2023-03-17 7:45 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 18/27] KVM: x86: Remove the unused page-track hook track_flush_slot() Sean Christopherson
2023-03-11 0:22 ` [PATCH v2 19/27] KVM: x86/mmu: Move KVM-only page-track declarations to internal header Sean Christopherson
2023-03-15 8:44 ` Yan Zhao
2023-03-15 15:13 ` Sean Christopherson
2023-03-16 9:19 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 20/27] KVM: x86/mmu: Use page-track notifiers iff there are external users Sean Christopherson
2023-03-15 9:34 ` Yan Zhao
2023-03-15 16:21 ` Sean Christopherson
2023-03-16 9:29 ` Yan Zhao
2023-03-15 10:36 ` Yan Zhao
2023-03-15 16:54 ` Sean Christopherson
2023-05-04 19:54 ` Sean Christopherson
2023-05-06 1:08 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 21/27] KVM: x86/mmu: Drop infrastructure for multiple page-track modes Sean Christopherson
2023-03-11 0:22 ` [PATCH v2 22/27] KVM: x86/mmu: Rename page-track APIs to reflect the new reality Sean Christopherson
2023-03-11 0:22 ` [PATCH v2 23/27] KVM: x86/mmu: Assert that correct locks are held for page write-tracking Sean Christopherson
2023-03-17 7:55 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 24/27] KVM: x86/mmu: Bug the VM if write-tracking is used but not enabled Sean Christopherson
2023-03-11 0:22 ` [PATCH v2 25/27] KVM: x86/mmu: Drop @slot param from exported/external page-track APIs Sean Christopherson
2023-03-17 8:28 ` Yan Zhao
2023-03-23 8:50 ` Yan Zhao
2023-05-03 23:16 ` Sean Christopherson
2023-05-04 2:17 ` Yan Zhao
2023-05-08 1:15 ` Yan Zhao
2023-05-11 22:39 ` Sean Christopherson
2023-05-12 2:58 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 26/27] KVM: x86/mmu: Handle KVM bookkeeping in page-track APIs, not callers Sean Christopherson
2023-03-17 8:52 ` Yan Zhao
2023-03-11 0:22 ` [PATCH v2 27/27] drm/i915/gvt: Drop final dependencies on KVM internal details Sean Christopherson
2023-03-17 8:58 ` Yan Zhao
2023-03-13 9:58 ` [PATCH v2 00/27] drm/i915/gvt: KVM: KVMGT fixes and page-track cleanups Yan Zhao
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