linux-kernel - [PATCH v4 00/10] Stage-2 huge mappings for pKVM np-guests

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Message-ID: <20250509131706.2336138-1-vdonnefort@google.com>
Date: Fri,  9 May 2025 14:16:56 +0100
From: Vincent Donnefort <vdonnefort@...gle.com>
To: maz@...nel.org, oliver.upton@...ux.dev, joey.gouly@....com, 
	suzuki.poulose@....com, yuzenghui@...wei.com, catalin.marinas@....com, 
	will@...nel.org
Cc: qperret@...gle.com, linux-arm-kernel@...ts.infradead.org, 
	kvmarm@...ts.linux.dev, linux-kernel@...r.kernel.org, kernel-team@...roid.com, 
	Vincent Donnefort <vdonnefort@...gle.com>
Subject: [PATCH v4 00/10] Stage-2 huge mappings for pKVM np-guests

Hi all,

This series adds support for stage-2 huge mappings (PMD_SIZE) to pKVM
np-guests, that is installing PMD-level mappings in the stage-2,
whenever the stage-1 is backed by either Hugetlbfs or THPs.

The last patch of that series is an optimization for CMOs using a shared
PMD_SIZE fixmap.

Changes since v3 (https://lore.kernel.org/all/20250407082706.1239603-1-vdonnefort@google.com/)

  - Rebase on kvmarm/next

Changes since v2 (https://lore.kernel.org/all/20250306110038.3733649-1-vdonnefort@google.com/)

  - Fix PUD_SIZE -> PMD_SIZE enforcement (Quentin)
  - Rework pkvm_host_share_guest() to remove one hyp_page walk (Quentin)
  - Remove one pgtable walk into __check_host_shared_guest() (Quentin)
  - Return EBUSY on host_share_guest_count overflow

Changes since v1 (https://lore.kernel.org/all/20250228102530.1229089-1-vdonnefort@google.com/)

  - WARN_ON() on !PAGE_ALIGNED size for guest CMOs (Quentin)
  - check_range_allowed_memory() before accessing the Vmemmap (Quentin)

Quentin Perret (2):
  KVM: arm64: Convert pkvm_mappings to interval tree
  KVM: arm64: Add a range to pkvm_mappings

Vincent Donnefort (8):
  KVM: arm64: Handle huge mappings for np-guest CMOs
  KVM: arm64: Introduce for_each_hyp_page
  KVM: arm64: Add a range to __pkvm_host_share_guest()
  KVM: arm64: Add a range to __pkvm_host_unshare_guest()
  KVM: arm64: Add a range to __pkvm_host_wrprotect_guest()
  KVM: arm64: Add a range to __pkvm_host_test_clear_young_guest()
  KVM: arm64: Stage-2 huge mappings for np-guests
  KVM: arm64: np-guest CMOs with PMD_SIZE fixmap

 arch/arm64/include/asm/kvm_pgtable.h          |   7 +-
 arch/arm64/include/asm/kvm_pkvm.h             |   2 +
 arch/arm64/kvm/hyp/include/nvhe/mem_protect.h |   8 +-
 arch/arm64/kvm/hyp/include/nvhe/memory.h      |  16 +-
 arch/arm64/kvm/hyp/include/nvhe/mm.h          |   4 +-
 arch/arm64/kvm/hyp/nvhe/hyp-main.c            |  16 +-
 arch/arm64/kvm/hyp/nvhe/mem_protect.c         | 276 ++++++++++++------
 arch/arm64/kvm/hyp/nvhe/mm.c                  |  86 +++++-
 arch/arm64/kvm/hyp/nvhe/setup.c               |  15 +-
 arch/arm64/kvm/hyp/pgtable.c                  |   6 -
 arch/arm64/kvm/mmu.c                          |   5 +-
 arch/arm64/kvm/pkvm.c                         | 129 ++++----
 12 files changed, 375 insertions(+), 195 deletions(-)


base-commit: c4e91ea0cc7e6345a4f7b8167e838d728ca86c30
-- 
2.49.0.1015.ga840276032-goog