[PATCH 29/30] KVM: arm64: Register 'selftest_vm' in the VM table

[Will Deacon]

In preparation for extending the pKVM page ownership selftests to cover
forceful reclaim of donated pages, rework the creation of the
'selftest_vm' so that it is registered in the VM table while the tests
are running.

Signed-off-by: Will Deacon <will at kernel.org>
---
 arch/arm64/kvm/hyp/include/nvhe/mem_protect.h |  2 +
 arch/arm64/kvm/hyp/nvhe/mem_protect.c         | 53 ++++---------------
 arch/arm64/kvm/hyp/nvhe/pkvm.c                | 49 +++++++++++++++++
 3 files changed, 61 insertions(+), 43 deletions(-)

diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
index e41a128b0854..3ad644111885 100644
--- a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
+++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
@@ -77,6 +77,8 @@ static __always_inline void __load_host_stage2(void)
 
 #ifdef CONFIG_NVHE_EL2_DEBUG
 void pkvm_ownership_selftest(void *base);
+struct pkvm_hyp_vcpu *init_selftest_vm(void *virt);
+void teardown_selftest_vm(void);
 #else
 static inline void pkvm_ownership_selftest(void *base) { }
 #endif
diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
index a586ca922258..f59f5e24ddda 100644
--- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c
+++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
@@ -1609,53 +1609,18 @@ struct pkvm_expected_state {
 
 static struct pkvm_expected_state selftest_state;
 static struct hyp_page *selftest_page;
-
-static struct pkvm_hyp_vm selftest_vm = {
-	.kvm = {
-		.arch = {
-			.mmu = {
-				.arch = &selftest_vm.kvm.arch,
-				.pgt = &selftest_vm.pgt,
-			},
-		},
-	},
-};
-
-static struct pkvm_hyp_vcpu selftest_vcpu = {
-	.vcpu = {
-		.arch = {
-			.hw_mmu = &selftest_vm.kvm.arch.mmu,
-		},
-		.kvm = &selftest_vm.kvm,
-	},
-};
-
-static void init_selftest_vm(void *virt)
-{
-	struct hyp_page *p = hyp_virt_to_page(virt);
-	int i;
-
-	selftest_vm.kvm.arch.mmu.vtcr = host_mmu.arch.mmu.vtcr;
-	WARN_ON(kvm_guest_prepare_stage2(&selftest_vm, virt));
-
-	for (i = 0; i < pkvm_selftest_pages(); i++) {
-		if (p[i].refcount)
-			continue;
-		p[i].refcount = 1;
-		hyp_put_page(&selftest_vm.pool, hyp_page_to_virt(&p[i]));
-	}
-}
+static struct pkvm_hyp_vcpu *selftest_vcpu;
 
 static u64 selftest_ipa(void)
 {
-	return BIT(selftest_vm.pgt.ia_bits - 1);
+	return BIT(selftest_vcpu->vcpu.arch.hw_mmu->pgt->ia_bits - 1);
 }
 
 static void assert_page_state(void)
 {
 	void *virt = hyp_page_to_virt(selftest_page);
 	u64 size = PAGE_SIZE << selftest_page->order;
-	struct pkvm_hyp_vcpu *vcpu = &selftest_vcpu;
+	struct pkvm_hyp_vcpu *vcpu = selftest_vcpu;
 	u64 phys = hyp_virt_to_phys(virt);
 	u64 ipa[2] = { selftest_ipa(), selftest_ipa() + PAGE_SIZE };
 	struct pkvm_hyp_vm *vm;
@@ -1670,10 +1635,10 @@ static void assert_page_state(void)
 	WARN_ON(__hyp_check_page_state_range(phys, size, selftest_state.hyp));
 	hyp_unlock_component();
 
-	guest_lock_component(&selftest_vm);
+	guest_lock_component(vm);
 	WARN_ON(__guest_check_page_state_range(vm, ipa[0], size, selftest_state.guest[0]));
 	WARN_ON(__guest_check_page_state_range(vm, ipa[1], size, selftest_state.guest[1]));
-	guest_unlock_component(&selftest_vm);
+	guest_unlock_component(vm);
 }
 
 #define assert_transition_res(res, fn, ...)		\
@@ -1686,14 +1651,15 @@ void pkvm_ownership_selftest(void *base)
 {
 	enum kvm_pgtable_prot prot = KVM_PGTABLE_PROT_RWX;
 	void *virt = hyp_alloc_pages(&host_s2_pool, 0);
-	struct pkvm_hyp_vcpu *vcpu = &selftest_vcpu;
-	struct pkvm_hyp_vm *vm = &selftest_vm;
+	struct pkvm_hyp_vcpu *vcpu;
 	u64 phys, size, pfn, gfn;
+	struct pkvm_hyp_vm *vm;
 
 	WARN_ON(!virt);
 	selftest_page = hyp_virt_to_page(virt);
 	selftest_page->refcount = 0;
-	init_selftest_vm(base);
+	selftest_vcpu = vcpu = init_selftest_vm(base);
+	vm = pkvm_hyp_vcpu_to_hyp_vm(vcpu);
 
 	size = PAGE_SIZE << selftest_page->order;
 	phys = hyp_virt_to_phys(virt);
@@ -1817,6 +1783,7 @@ void pkvm_ownership_selftest(void *base)
 	selftest_state.hyp = PKVM_PAGE_OWNED;
 	assert_transition_res(0,	__pkvm_host_donate_hyp, pfn, 1);
 
+	teardown_selftest_vm();
 	selftest_page->refcount = 1;
 	hyp_put_page(&host_s2_pool, virt);
 }
diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c
index 2890328f4a78..6dc90ccc99a2 100644
--- a/arch/arm64/kvm/hyp/nvhe/pkvm.c
+++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c
@@ -696,6 +696,55 @@ void __pkvm_unreserve_vm(pkvm_handle_t handle)
 	hyp_spin_unlock(&vm_table_lock);
 }
 
+#ifdef CONFIG_NVHE_EL2_DEBUG
+static struct pkvm_hyp_vm selftest_vm = {
+	.kvm = {
+		.arch = {
+			.mmu = {
+				.arch = &selftest_vm.kvm.arch,
+				.pgt = &selftest_vm.pgt,
+			},
+		},
+	},
+};
+
+static struct pkvm_hyp_vcpu selftest_vcpu = {
+	.vcpu = {
+		.arch = {
+			.hw_mmu = &selftest_vm.kvm.arch.mmu,
+		},
+		.kvm = &selftest_vm.kvm,
+	},
+};
+
+struct pkvm_hyp_vcpu *init_selftest_vm(void *virt)
+{
+	struct hyp_page *p = hyp_virt_to_page(virt);
+	int i;
+
+	selftest_vm.kvm.arch.mmu.vtcr = host_mmu.arch.mmu.vtcr;
+	WARN_ON(kvm_guest_prepare_stage2(&selftest_vm, virt));
+
+	for (i = 0; i < pkvm_selftest_pages(); i++) {
+		if (p[i].refcount)
+			continue;
+		p[i].refcount = 1;
+		hyp_put_page(&selftest_vm.pool, hyp_page_to_virt(&p[i]));
+	}
+
+	selftest_vm.kvm.arch.pkvm.handle = __pkvm_reserve_vm();
+	insert_vm_table_entry(selftest_vm.kvm.arch.pkvm.handle, &selftest_vm);
+	return &selftest_vcpu;
+}
+
+void teardown_selftest_vm(void)
+{
+	hyp_spin_lock(&vm_table_lock);
+	remove_vm_table_entry(selftest_vm.kvm.arch.pkvm.handle);
+	hyp_spin_unlock(&vm_table_lock);
+}
+#endif /* CONFIG_NVHE_EL2_DEBUG */
+
 /*
  * Initialize the hypervisor copy of the VM state using host-donated memory.
  *
-- 
2.52.0.351.gbe84eed79e-goog