linux-kernel - [PATCH 0/4] KVM: selftests: Add test of SET_NESTED

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Message-ID: <20250917215031.2567566-1-jmattson@google.com>
Date: Wed, 17 Sep 2025 14:48:36 -0700
From: Jim Mattson <jmattson@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Shuah Khan <shuah@...nel.org>, 
	Sean Christopherson <seanjc@...gle.com>, Bibo Mao <maobibo@...ngson.cn>, 
	Huacai Chen <chenhuacai@...nel.org>, Andrew Jones <ajones@...tanamicro.com>, 
	Claudio Imbrenda <imbrenda@...ux.ibm.com>, "Pratik R. Sampat" <prsampat@....com>, 
	Kai Huang <kai.huang@...el.com>, Eric Auger <eric.auger@...hat.com>, 
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, 
	linux-kselftest@...r.kernel.org
Cc: Jim Mattson <jmattson@...gle.com>
Subject: [PATCH 0/4] KVM: selftests: Add test of SET_NESTED_STATE with 48-bit
 L2 on 57-bit L1

Prior to commit 9245fd6b8531 ("KVM: x86: model canonical checks more
precisely"), KVM_SET_NESTED_STATE would fail if the state was captured
with L2 active, L1 had CR4.LA57 set, L2 did not, and the
VMCS12.HOST_GSBASE (or other host-state field checked for canonicality)
had an address greater than 48 bits wide.

Add a regression test that reproduces the KVM_SET_NESTED_STATE failure
conditions. To do so, the first three patches add support for 5-level
paging in the selftest L1 VM.

Jim Mattson (4):
  KVM: selftests: Use a loop to create guest page tables
  KVM: selftests: Use a loop to walk guest page tables
  KVM: selftests: Add VM_MODE_PXXV57_4K VM mode
  KVM: selftests: Add a VMX test for LA57 nested state

 tools/testing/selftests/kvm/Makefile.kvm      |   1 +
 .../testing/selftests/kvm/include/kvm_util.h  |   1 +
 tools/testing/selftests/kvm/lib/kvm_util.c    |  21 +++
 .../testing/selftests/kvm/lib/x86/processor.c |  66 ++++-----
 tools/testing/selftests/kvm/lib/x86/vmx.c     |   7 +-
 .../kvm/x86/vmx_la57_nested_state_test.c      | 137 ++++++++++++++++++
 6 files changed, 195 insertions(+), 38 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/x86/vmx_la57_nested_state_test.c

-- 
2.51.0.470.ga7dc726c21-goog