linux-kernel - [PATCH v4 12/21] KVM: selftests: Add a stage-2 MMU instance to kvm

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Message-ID: <20251230230150.4150236-13-seanjc@google.com>
Date: Tue, 30 Dec 2025 15:01:41 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>, 
	Oliver Upton <oupton@...nel.org>, Tianrui Zhao <zhaotianrui@...ngson.cn>, 
	Bibo Mao <maobibo@...ngson.cn>, Huacai Chen <chenhuacai@...nel.org>, 
	Anup Patel <anup@...infault.org>, Paul Walmsley <pjw@...nel.org>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Christian Borntraeger <borntraeger@...ux.ibm.com>, Janosch Frank <frankja@...ux.ibm.com>, 
	Claudio Imbrenda <imbrenda@...ux.ibm.com>, Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	kvmarm@...ts.linux.dev, loongarch@...ts.linux.dev, 
	kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, Yosry Ahmed <yosry.ahmed@...ux.dev>
Subject: [PATCH v4 12/21] KVM: selftests: Add a stage-2 MMU instance to kvm_vm

Add a stage-2 MMU instance so that architectures that support nested
virtualization (more specifically, nested stage-2 page tables) can create
and track stage-2 page tables for running L2 guests.  Plumb the structure
into common code to avoid cyclical dependencies, and to provide some line
of sight to having common APIs for creating stage-2 mappings.

As a bonus, putting the member in common code justifies using stage2_mmu
instead of tdp_mmu for x86.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/include/kvm_util.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index c1497515fa6a..371d55e0366e 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -116,7 +116,12 @@ struct kvm_vm {
 	uint32_t dirty_ring_size;
 	uint64_t gpa_tag_mask;
 
+	/*
+	 * "mmu" is the guest's stage-1, with a short name because the vast
+	 * majority of tests only care about the stage-1 MMU.
+	 */
 	struct kvm_mmu mmu;
+	struct kvm_mmu stage2_mmu;
 
 	struct kvm_vm_arch arch;
 
-- 
2.52.0.351.gbe84eed79e-goog