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KVM: arm64: Register 'selftest_vm' in the VM table

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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.

Tested-by: Fuad Tabba <tabba@google.com>
Tested-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Link: https://patch.msgid.link/20260330144841.26181-35-will@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Will Deacon 2026-03-30 15:48:35 +01:00 committed by Marc Zyngier
parent c290df5278
commit 8972a99160
3 changed files with 61 additions and 43 deletions
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2
arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
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@ -76,6 +76,8 @@ 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

53
arch/arm64/kvm/hyp/nvhe/mem_protect.c
View File

@ -1648,53 +1648,18 @@ 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;
@ -1709,10 +1674,10 @@ 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, ...) \
@ -1725,14 +1690,15 @@ 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);
@ -1856,6 +1822,7 @@ 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);
}

49
arch/arm64/kvm/hyp/nvhe/pkvm.c
View File

@ -733,6 +733,55 @@ 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.
*