Fix a variety of found-by-inspection bugs in KVMGT, and overhaul KVM's page-track APIs to provide a leaner and cleaner interface. The motivation for this series is to (significantly) reduce the number of KVM APIs that KVMGT uses, with a long-term goal of making all kvm_host.h headers KVM-internal. As was the case in v1, tThe KVMGT changes are compile tested only. Based on "git://git.kernel.org/pub/scm/virt/kvm/kvm.git next". v2: - Reuse vgpu_lock to protect gfn hash instead of introducing a new (and buggy) mutext. [Yan] - Remove a spurious return from kvm_page_track_init(). [Yan] - Take @kvm directly in the inner __kvm_page_track_write(). [Yan] - Delete the gfn sanity check that relies on kvm_is_visible_gfn() instead of providing a dedicated interface. [Yan] v1: https://lore.kernel.org/lkml/20221223005739.1295925-1-seanjc@xxxxxxxxxx Sean Christopherson (23): drm/i915/gvt: Verify pfn is "valid" before dereferencing "struct page" KVM: x86/mmu: Factor out helper to get max mapping size of a memslot drm/i915/gvt: Incorporate KVM memslot info into check for 2MiB GTT entry drm/i915/gvt: Verify VFIO-pinned page is THP when shadowing 2M gtt entry drm/i915/gvt: Put the page reference obtained by KVM's gfn_to_pfn() drm/i915/gvt: Don't rely on KVM's gfn_to_pfn() to query possible 2M GTT drm/i915/gvt: Use an "unsigned long" to iterate over memslot gfns drm/i915/gvt: Drop unused helper intel_vgpu_reset_gtt() drm/i915/gvt: Protect gfn hash table with vgpu_lock KVM: x86/mmu: Don't rely on page-track mechanism to flush on memslot change KVM: x86/mmu: Don't bounce through page-track mechanism for guest PTEs KVM: drm/i915/gvt: Drop @vcpu from KVM's ->track_write() hook KVM: x86: Reject memslot MOVE operations if KVMGT is attached drm/i915/gvt: Don't bother removing write-protection on to-be-deleted slot KVM: x86/mmu: Move KVM-only page-track declarations to internal header KVM: x86/mmu: Use page-track notifiers iff there are external users KVM: x86/mmu: Drop infrastructure for multiple page-track modes KVM: x86/mmu: Rename page-track APIs to reflect the new reality KVM: x86/mmu: Assert that correct locks are held for page write-tracking KVM: x86/mmu: Bug the VM if write-tracking is used but not enabled KVM: x86/mmu: Drop @slot param from exported/external page-track APIs KVM: x86/mmu: Handle KVM bookkeeping in page-track APIs, not callers drm/i915/gvt: Drop final dependencies on KVM internal details Yan Zhao (4): drm/i915/gvt: remove interface intel_gvt_is_valid_gfn KVM: x86: Add a new page-track hook to handle memslot deletion drm/i915/gvt: switch from ->track_flush_slot() to ->track_remove_region() KVM: x86: Remove the unused page-track hook track_flush_slot() arch/x86/include/asm/kvm_host.h | 16 +- arch/x86/include/asm/kvm_page_track.h | 66 +++---- arch/x86/kvm/mmu.h | 2 + arch/x86/kvm/mmu/mmu.c | 61 +++--- arch/x86/kvm/mmu/mmu_internal.h | 2 + arch/x86/kvm/mmu/page_track.c | 270 ++++++++++++++------------ arch/x86/kvm/mmu/page_track.h | 58 ++++++ arch/x86/kvm/x86.c | 13 +- drivers/gpu/drm/i915/gvt/gtt.c | 88 ++------- drivers/gpu/drm/i915/gvt/gtt.h | 1 - drivers/gpu/drm/i915/gvt/gvt.h | 3 +- drivers/gpu/drm/i915/gvt/kvmgt.c | 132 ++++++------- drivers/gpu/drm/i915/gvt/page_track.c | 10 +- 13 files changed, 361 insertions(+), 361 deletions(-) create mode 100644 arch/x86/kvm/mmu/page_track.h base-commit: 45dd9bc75d9adc9483f0c7d662ba6e73ed698a0b -- 2.40.0.rc1.284.g88254d51c5-goog
