linux-kernel - [PATCH v3 00/16] Add Nested NPT support in selftests

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Message-ID: <20251127013440.3324671-1-yosry.ahmed@linux.dev>
Date: Thu, 27 Nov 2025 01:34:24 +0000
From: Yosry Ahmed <yosry.ahmed@...ux.dev>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Yosry Ahmed <yosry.ahmed@...ux.dev>
Subject: [PATCH v3 00/16] Add Nested NPT support in selftests

This series adds support for nested NPT, then extends vmx_dirty_log_test
and kvm_dirty_log_test (with -n, using memstress) to cover nested SVM.

Patches 1-5 are cleanups and prep.

Patches 6-7 introduce a new data structure, kvm_mmu, that is used by virt
mapping functions for guest page tables.

Patches 8-11 add a nested kvm_mmu for nested EPTs, which are now shared
between all vCPUs, and reuses the virt mapping functions for EPTs.

Patches 12-14 add the support for nested NPTs, which becomes simple
after all the above prep work.

Patches 15-16 extend the existing selftests exercising nested EPTs to
also cover nested NPTs.

v2 -> v3:
- Dropped the patches that landed in kvm-x86.
- Reshuffled some patches and cleanups.
- Introduced kvm_mmu data structures to hold the root, page table
  levels, and page table masks (Sean).
- Extended memstress as well to cover nested SVM.

v2: https://lore.kernel.org/kvm/20251021074736.1324328-1-yosry.ahmed@linux.dev/

Yosry Ahmed (16):
  KVM: selftests: Make __vm_get_page_table_entry() static
  KVM: selftests: Stop passing a memslot to nested_map_memslot()
  KVM: selftests: Rename nested TDP mapping functions
  KVM: selftests: Kill eptPageTablePointer
  KVM: selftests: Stop setting AD bits on nested EPTs on creation
  KVM: selftests: Introduce struct kvm_mmu
  KVM: selftests: Move PTE bitmasks to kvm_mmu
  KVM: selftests: Use a nested MMU to share nested EPTs between vCPUs
  KVM: selftests: Stop passing VMX metadata to TDP mapping functions
  KVM: selftests: Reuse virt mapping functions for nested EPTs
  KVM: selftests: Move TDP mapping functions outside of vmx.c
  KVM: selftests: Allow kvm_cpu_has_ept() to be called on AMD CPUs
  KVM: selftests: Add support for nested NPTs
  KVM: selftests: Set the user bit on nested NPT PTEs
  KVM: selftests: Extend vmx_dirty_log_test to cover SVM
  KVM: selftests: Extend memstress to run on nested SVM

 tools/testing/selftests/kvm/Makefile.kvm      |   2 +-
 .../selftests/kvm/include/x86/kvm_util_arch.h |   7 +
 .../selftests/kvm/include/x86/processor.h     |  68 ++++-
 .../selftests/kvm/include/x86/svm_util.h      |   9 +
 tools/testing/selftests/kvm/include/x86/vmx.h |  16 +-
 .../testing/selftests/kvm/lib/x86/memstress.c |  68 +++--
 .../testing/selftests/kvm/lib/x86/processor.c | 217 ++++++++++++---
 tools/testing/selftests/kvm/lib/x86/svm.c     |  25 ++
 tools/testing/selftests/kvm/lib/x86/vmx.c     | 256 ++++--------------
 ...rty_log_test.c => nested_dirty_log_test.c} |  87 ++++--
 10 files changed, 428 insertions(+), 327 deletions(-)
 rename tools/testing/selftests/kvm/x86/{vmx_dirty_log_test.c => nested_dirty_log_test.c} (67%)


base-commit: 115d5de2eef32ac5cd488404b44b38789362dbe6
-- 
2.52.0.158.g65b55ccf14-goog