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KVM: arm64: Stage-2 huge mappings for np-guests

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Now np-guests hypercalls with range are supported, we can let the
hypervisor to install block mappings whenever the Stage-1 allows it,
that is when backed by either Hugetlbfs or THPs. The size of those block
mappings is limited to PMD_SIZE.

Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://lore.kernel.org/r/20250521124834.1070650-10-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Vincent Donnefort
2025-05-21 13:48:33 +01:00
committed by Marc Zyngier
parent 3669ddd8fa
commit db14091d8f
3 changed files with 20 additions and 11 deletions
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23
arch/arm64/kvm/hyp/nvhe/mem_protect.c
View File

@@ -166,12 +166,6 @@ int kvm_host_prepare_stage2(void *pgt_pool_base)
return 0;
}
static bool guest_stage2_force_pte_cb(u64 addr, u64 end,
enum kvm_pgtable_prot prot)
{
return true;
}
static void *guest_s2_zalloc_pages_exact(size_t size)
{
void *addr = hyp_alloc_pages(&current_vm->pool, get_order(size));
@@ -278,8 +272,7 @@ int kvm_guest_prepare_stage2(struct pkvm_hyp_vm *vm, void *pgd)
};
guest_lock_component(vm);
ret = __kvm_pgtable_stage2_init(mmu->pgt, mmu, &vm->mm_ops, 0,
guest_stage2_force_pte_cb);
ret = __kvm_pgtable_stage2_init(mmu->pgt, mmu, &vm->mm_ops, 0, NULL);
guest_unlock_component(vm);
if (ret)
return ret;
@@ -908,12 +901,24 @@ int __pkvm_host_unshare_ffa(u64 pfn, u64 nr_pages)
static int __guest_check_transition_size(u64 phys, u64 ipa, u64 nr_pages, u64 *size)
{
size_t block_size;
if (nr_pages == 1) {
*size = PAGE_SIZE;
return 0;
}
return -EINVAL;
/* We solely support second to last level huge mapping */
block_size = kvm_granule_size(KVM_PGTABLE_LAST_LEVEL - 1);
if (nr_pages != block_size >> PAGE_SHIFT)
return -EINVAL;
if (!IS_ALIGNED(phys | ipa, block_size))
return -EINVAL;
*size = block_size;
return 0;
}
int __pkvm_host_share_guest(u64 pfn, u64 gfn, u64 nr_pages, struct pkvm_hyp_vcpu *vcpu,

6
arch/arm64/kvm/mmu.c
View File

@@ -1304,6 +1304,10 @@ static bool fault_supports_stage2_huge_mapping(struct kvm_memory_slot *memslot,
if (map_size == PAGE_SIZE)
return true;
/* pKVM only supports PMD_SIZE huge-mappings */
if (is_protected_kvm_enabled() && map_size != PMD_SIZE)
return false;
size = memslot->npages * PAGE_SIZE;
gpa_start = memslot->base_gfn << PAGE_SHIFT;
@@ -1537,7 +1541,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
* logging_active is guaranteed to never be true for VM_PFNMAP
* memslots.
*/
if (logging_active || is_protected_kvm_enabled()) {
if (logging_active) {
force_pte = true;
vma_shift = PAGE_SHIFT;
} else {

2
arch/arm64/kvm/pkvm.c
View File

@@ -351,7 +351,7 @@ int pkvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
u64 pfn = phys >> PAGE_SHIFT;
int ret;
if (size != PAGE_SIZE)
if (size != PAGE_SIZE && size != PMD_SIZE)
return -EINVAL;
lockdep_assert_held_write(&kvm->mmu_lock);