linux-kernel - [RFC PATCH 00/16] KVM: arm64: Add "struct kvm_page

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Message-ID: <20250821210042.3451147-1-seanjc@google.com>
Date: Thu, 21 Aug 2025 14:00:26 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, Sean Christopherson <seanjc@...gle.com>, 
	James Houghton <jthoughton@...gle.com>
Subject: [RFC PATCH 00/16] KVM: arm64: Add "struct kvm_page_fault"

Add an arm64 version of "struct kvm_page_fault" to (hopefully) tidy up
the abort path, and to pave the way for things like KVM Userfault[*] that
want to consume kvm_page_fault in arch-neutral code.

This is essentially one giant nop of code shuffling.

RFC as this is only compile-tested.  I didn't want to spend time testing
until I got feedback on whether or not y'all are amenable to the general idea.

[*] https://lore.kernel.org/all/20250618042424.330664-1-jthoughton@google.com

Sean Christopherson (16):
  KVM: arm64: Drop nested "esr" to eliminate variable shadowing
  KVM: arm64: Get iabt status on-demand
  KVM: arm64: Move SRCU-protected region of kvm_handle_guest_abort() to
    helper
  KVM: arm64: Use guard(srcu) in kvm_handle_guest_abort()
  KVM: arm64: Introduce "struct kvm_page_fault" for tracking abort state
  KVM: arm64: Pass kvm_page_fault pointer to
    transparent_hugepage_adjust()
  KVM: arm64: Pass @fault to fault_supports_stage2_huge_mapping()
  KVM: arm64: Add helper to get permission fault granule from ESR
  KVM: arm64: Track perm fault granule in "struct kvm_page_fault"
  KVM: arm64: Drop local vfio_allow_any_uc, use vm_flags snapshot
  KVM: arm64: Drop local mte_allowed, use vm_flags snapshot
  KVM: arm64: Move VMA-related information into "struct kvm_page_fault"
  KVM: arm64: Stash "mmu_seq" in "struct kvm_page_fault"
  KVM: arm64: Track "forced" information in "struct kvm_page_fault"
  KVM: arm64: Extract mmap_lock-protected code to helper for user mem
    aborts
  KVM: arm64: Don't bother nullifying "vma" in mem abort path

 arch/arm64/include/asm/esr.h         |   6 +
 arch/arm64/include/asm/kvm_emulate.h |   9 -
 arch/arm64/include/asm/kvm_host.h    |  32 ++
 arch/arm64/kvm/mmu.c                 | 514 +++++++++++++--------------
 4 files changed, 282 insertions(+), 279 deletions(-)


base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585
-- 
2.51.0.261.g7ce5a0a67e-goog