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Diffstat (limited to 'arch/arm64/kvm/hyp/nvhe/mem_protect.c')
-rw-r--r--arch/arm64/kvm/hyp/nvhe/mem_protect.c1192
1 files changed, 624 insertions, 568 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
index 861c76021a25..95d7534c9679 100644
--- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c
+++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
@@ -60,6 +60,11 @@ static void hyp_unlock_component(void)
hyp_spin_unlock(&pkvm_pgd_lock);
}
+#define for_each_hyp_page(__p, __st, __sz) \
+ for (struct hyp_page *__p = hyp_phys_to_page(__st), \
+ *__e = __p + ((__sz) >> PAGE_SHIFT); \
+ __p < __e; __p++)
+
static void *host_s2_zalloc_pages_exact(size_t size)
{
void *addr = hyp_alloc_pages(&host_s2_pool, get_order(size));
@@ -161,12 +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));
@@ -201,8 +200,8 @@ static void *guest_s2_zalloc_page(void *mc)
memset(addr, 0, PAGE_SIZE);
p = hyp_virt_to_page(addr);
- memset(p, 0, sizeof(*p));
p->refcount = 1;
+ p->order = 0;
return addr;
}
@@ -217,16 +216,42 @@ static void guest_s2_put_page(void *addr)
hyp_put_page(&current_vm->pool, addr);
}
+static void __apply_guest_page(void *va, size_t size,
+ void (*func)(void *addr, size_t size))
+{
+ size += va - PTR_ALIGN_DOWN(va, PAGE_SIZE);
+ va = PTR_ALIGN_DOWN(va, PAGE_SIZE);
+ size = PAGE_ALIGN(size);
+
+ while (size) {
+ size_t map_size = PAGE_SIZE;
+ void *map;
+
+ if (IS_ALIGNED((unsigned long)va, PMD_SIZE) && size >= PMD_SIZE)
+ map = hyp_fixblock_map(__hyp_pa(va), &map_size);
+ else
+ map = hyp_fixmap_map(__hyp_pa(va));
+
+ func(map, map_size);
+
+ if (map_size == PMD_SIZE)
+ hyp_fixblock_unmap();
+ else
+ hyp_fixmap_unmap();
+
+ size -= map_size;
+ va += map_size;
+ }
+}
+
static void clean_dcache_guest_page(void *va, size_t size)
{
- __clean_dcache_guest_page(hyp_fixmap_map(__hyp_pa(va)), size);
- hyp_fixmap_unmap();
+ __apply_guest_page(va, size, __clean_dcache_guest_page);
}
static void invalidate_icache_guest_page(void *va, size_t size)
{
- __invalidate_icache_guest_page(hyp_fixmap_map(__hyp_pa(va)), size);
- hyp_fixmap_unmap();
+ __apply_guest_page(va, size, __invalidate_icache_guest_page);
}
int kvm_guest_prepare_stage2(struct pkvm_hyp_vm *vm, void *pgd)
@@ -255,8 +280,7 @@ 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;
@@ -266,8 +290,9 @@ int kvm_guest_prepare_stage2(struct pkvm_hyp_vm *vm, void *pgd)
return 0;
}
-void reclaim_guest_pages(struct pkvm_hyp_vm *vm, struct kvm_hyp_memcache *mc)
+void reclaim_pgtable_pages(struct pkvm_hyp_vm *vm, struct kvm_hyp_memcache *mc)
{
+ struct hyp_page *page;
void *addr;
/* Dump all pgtable pages in the hyp_pool */
@@ -279,7 +304,9 @@ void reclaim_guest_pages(struct pkvm_hyp_vm *vm, struct kvm_hyp_memcache *mc)
/* Drain the hyp_pool into the memcache */
addr = hyp_alloc_pages(&vm->pool, 0);
while (addr) {
- memset(hyp_virt_to_page(addr), 0, sizeof(struct hyp_page));
+ page = hyp_virt_to_page(addr);
+ page->refcount = 0;
+ page->order = 0;
push_hyp_memcache(mc, addr, hyp_virt_to_phys);
WARN_ON(__pkvm_hyp_donate_host(hyp_virt_to_pfn(addr), 1));
addr = hyp_alloc_pages(&vm->pool, 0);
@@ -306,7 +333,7 @@ int __pkvm_prot_finalize(void)
*/
kvm_flush_dcache_to_poc(params, sizeof(*params));
- write_sysreg(params->hcr_el2, hcr_el2);
+ write_sysreg_hcr(params->hcr_el2);
__load_stage2(&host_mmu.arch.mmu, &host_mmu.arch);
/*
@@ -382,19 +409,28 @@ bool addr_is_memory(phys_addr_t phys)
return !!find_mem_range(phys, &range);
}
-static bool addr_is_allowed_memory(phys_addr_t phys)
+static bool is_in_mem_range(u64 addr, struct kvm_mem_range *range)
+{
+ return range->start <= addr && addr < range->end;
+}
+
+static int check_range_allowed_memory(u64 start, u64 end)
{
struct memblock_region *reg;
struct kvm_mem_range range;
- reg = find_mem_range(phys, &range);
+ /*
+ * Callers can't check the state of a range that overlaps memory and
+ * MMIO regions, so ensure [start, end[ is in the same kvm_mem_range.
+ */
+ reg = find_mem_range(start, &range);
+ if (!is_in_mem_range(end - 1, &range))
+ return -EINVAL;
- return reg && !(reg->flags & MEMBLOCK_NOMAP);
-}
+ if (!reg || reg->flags & MEMBLOCK_NOMAP)
+ return -EPERM;
-static bool is_in_mem_range(u64 addr, struct kvm_mem_range *range)
-{
- return range->start <= addr && addr < range->end;
+ return 0;
}
static bool range_is_memory(u64 start, u64 end)
@@ -454,8 +490,11 @@ static int host_stage2_adjust_range(u64 addr, struct kvm_mem_range *range)
if (kvm_pte_valid(pte))
return -EAGAIN;
- if (pte)
+ if (pte) {
+ WARN_ON(addr_is_memory(addr) &&
+ get_host_state(hyp_phys_to_page(addr)) != PKVM_NOPAGE);
return -EPERM;
+ }
do {
u64 granule = kvm_granule_size(level);
@@ -477,10 +516,31 @@ int host_stage2_idmap_locked(phys_addr_t addr, u64 size,
return host_stage2_try(__host_stage2_idmap, addr, addr + size, prot);
}
+static void __host_update_page_state(phys_addr_t addr, u64 size, enum pkvm_page_state state)
+{
+ for_each_hyp_page(page, addr, size)
+ set_host_state(page, state);
+}
+
int host_stage2_set_owner_locked(phys_addr_t addr, u64 size, u8 owner_id)
{
- return host_stage2_try(kvm_pgtable_stage2_set_owner, &host_mmu.pgt,
- addr, size, &host_s2_pool, owner_id);
+ int ret;
+
+ if (!range_is_memory(addr, addr + size))
+ return -EPERM;
+
+ ret = host_stage2_try(kvm_pgtable_stage2_set_owner, &host_mmu.pgt,
+ addr, size, &host_s2_pool, owner_id);
+ if (ret)
+ return ret;
+
+ /* Don't forget to update the vmemmap tracking for the host */
+ if (owner_id == PKVM_ID_HOST)
+ __host_update_page_state(addr, size, PKVM_PAGE_OWNED);
+ else
+ __host_update_page_state(addr, size, PKVM_NOPAGE);
+
+ return 0;
}
static bool host_stage2_force_pte_cb(u64 addr, u64 end, enum kvm_pgtable_prot prot)
@@ -533,46 +593,26 @@ void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt)
int ret = 0;
esr = read_sysreg_el2(SYS_ESR);
- BUG_ON(!__get_fault_info(esr, &fault));
+ if (!__get_fault_info(esr, &fault)) {
+ /*
+ * We've presumably raced with a page-table change which caused
+ * AT to fail, try again.
+ */
+ return;
+ }
+
+
+ /*
+ * Yikes, we couldn't resolve the fault IPA. This should reinject an
+ * abort into the host when we figure out how to do that.
+ */
+ BUG_ON(!(fault.hpfar_el2 & HPFAR_EL2_NS));
+ addr = FIELD_GET(HPFAR_EL2_FIPA, fault.hpfar_el2) << 12;
- addr = (fault.hpfar_el2 & HPFAR_MASK) << 8;
ret = host_stage2_idmap(addr);
BUG_ON(ret && ret != -EAGAIN);
}
-struct pkvm_mem_transition {
- u64 nr_pages;
-
- struct {
- enum pkvm_component_id id;
- /* Address in the initiator's address space */
- u64 addr;
-
- union {
- struct {
- /* Address in the completer's address space */
- u64 completer_addr;
- } host;
- struct {
- u64 completer_addr;
- } hyp;
- };
- } initiator;
-
- struct {
- enum pkvm_component_id id;
- } completer;
-};
-
-struct pkvm_mem_share {
- const struct pkvm_mem_transition tx;
- const enum kvm_pgtable_prot completer_prot;
-};
-
-struct pkvm_mem_donation {
- const struct pkvm_mem_transition tx;
-};
-
struct check_walk_data {
enum pkvm_page_state desired;
enum pkvm_page_state (*get_page_state)(kvm_pte_t pte, u64 addr);
@@ -598,708 +638,724 @@ static int check_page_state_range(struct kvm_pgtable *pgt, u64 addr, u64 size,
return kvm_pgtable_walk(pgt, addr, size, &walker);
}
-static enum pkvm_page_state host_get_page_state(kvm_pte_t pte, u64 addr)
-{
- if (!addr_is_allowed_memory(addr))
- return PKVM_NOPAGE;
-
- if (!kvm_pte_valid(pte) && pte)
- return PKVM_NOPAGE;
-
- return pkvm_getstate(kvm_pgtable_stage2_pte_prot(pte));
-}
-
static int __host_check_page_state_range(u64 addr, u64 size,
enum pkvm_page_state state)
{
- struct check_walk_data d = {
- .desired = state,
- .get_page_state = host_get_page_state,
- };
-
- hyp_assert_lock_held(&host_mmu.lock);
- return check_page_state_range(&host_mmu.pgt, addr, size, &d);
-}
-
-static int __host_set_page_state_range(u64 addr, u64 size,
- enum pkvm_page_state state)
-{
- enum kvm_pgtable_prot prot = pkvm_mkstate(PKVM_HOST_MEM_PROT, state);
-
- return host_stage2_idmap_locked(addr, size, prot);
-}
-
-static int host_request_owned_transition(u64 *completer_addr,
- const struct pkvm_mem_transition *tx)
-{
- u64 size = tx->nr_pages * PAGE_SIZE;
- u64 addr = tx->initiator.addr;
-
- *completer_addr = tx->initiator.host.completer_addr;
- return __host_check_page_state_range(addr, size, PKVM_PAGE_OWNED);
-}
-
-static int host_request_unshare(u64 *completer_addr,
- const struct pkvm_mem_transition *tx)
-{
- u64 size = tx->nr_pages * PAGE_SIZE;
- u64 addr = tx->initiator.addr;
-
- *completer_addr = tx->initiator.host.completer_addr;
- return __host_check_page_state_range(addr, size, PKVM_PAGE_SHARED_OWNED);
-}
-
-static int host_initiate_share(u64 *completer_addr,
- const struct pkvm_mem_transition *tx)
-{
- u64 size = tx->nr_pages * PAGE_SIZE;
- u64 addr = tx->initiator.addr;
-
- *completer_addr = tx->initiator.host.completer_addr;
- return __host_set_page_state_range(addr, size, PKVM_PAGE_SHARED_OWNED);
-}
+ int ret;
-static int host_initiate_unshare(u64 *completer_addr,
- const struct pkvm_mem_transition *tx)
-{
- u64 size = tx->nr_pages * PAGE_SIZE;
- u64 addr = tx->initiator.addr;
+ ret = check_range_allowed_memory(addr, addr + size);
+ if (ret)
+ return ret;
- *completer_addr = tx->initiator.host.completer_addr;
- return __host_set_page_state_range(addr, size, PKVM_PAGE_OWNED);
-}
+ hyp_assert_lock_held(&host_mmu.lock);
-static int host_initiate_donation(u64 *completer_addr,
- const struct pkvm_mem_transition *tx)
-{
- u8 owner_id = tx->completer.id;
- u64 size = tx->nr_pages * PAGE_SIZE;
+ for_each_hyp_page(page, addr, size) {
+ if (get_host_state(page) != state)
+ return -EPERM;
+ }
- *completer_addr = tx->initiator.host.completer_addr;
- return host_stage2_set_owner_locked(tx->initiator.addr, size, owner_id);
+ return 0;
}
-static bool __host_ack_skip_pgtable_check(const struct pkvm_mem_transition *tx)
+static int __host_set_page_state_range(u64 addr, u64 size,
+ enum pkvm_page_state state)
{
- return !(IS_ENABLED(CONFIG_NVHE_EL2_DEBUG) ||
- tx->initiator.id != PKVM_ID_HYP);
-}
+ if (get_host_state(hyp_phys_to_page(addr)) == PKVM_NOPAGE) {
+ int ret = host_stage2_idmap_locked(addr, size, PKVM_HOST_MEM_PROT);
-static int __host_ack_transition(u64 addr, const struct pkvm_mem_transition *tx,
- enum pkvm_page_state state)
-{
- u64 size = tx->nr_pages * PAGE_SIZE;
+ if (ret)
+ return ret;
+ }
- if (__host_ack_skip_pgtable_check(tx))
- return 0;
+ __host_update_page_state(addr, size, state);
- return __host_check_page_state_range(addr, size, state);
+ return 0;
}
-static int host_ack_donation(u64 addr, const struct pkvm_mem_transition *tx)
+static void __hyp_set_page_state_range(phys_addr_t phys, u64 size, enum pkvm_page_state state)
{
- return __host_ack_transition(addr, tx, PKVM_NOPAGE);
+ for_each_hyp_page(page, phys, size)
+ set_hyp_state(page, state);
}
-static int host_complete_donation(u64 addr, const struct pkvm_mem_transition *tx)
+static int __hyp_check_page_state_range(phys_addr_t phys, u64 size, enum pkvm_page_state state)
{
- u64 size = tx->nr_pages * PAGE_SIZE;
- u8 host_id = tx->completer.id;
+ for_each_hyp_page(page, phys, size) {
+ if (get_hyp_state(page) != state)
+ return -EPERM;
+ }
- return host_stage2_set_owner_locked(addr, size, host_id);
+ return 0;
}
-static enum pkvm_page_state hyp_get_page_state(kvm_pte_t pte, u64 addr)
+static enum pkvm_page_state guest_get_page_state(kvm_pte_t pte, u64 addr)
{
if (!kvm_pte_valid(pte))
return PKVM_NOPAGE;
- return pkvm_getstate(kvm_pgtable_hyp_pte_prot(pte));
+ return pkvm_getstate(kvm_pgtable_stage2_pte_prot(pte));
}
-static int __hyp_check_page_state_range(u64 addr, u64 size,
- enum pkvm_page_state state)
+static int __guest_check_page_state_range(struct pkvm_hyp_vm *vm, u64 addr,
+ u64 size, enum pkvm_page_state state)
{
struct check_walk_data d = {
.desired = state,
- .get_page_state = hyp_get_page_state,
+ .get_page_state = guest_get_page_state,
};
- hyp_assert_lock_held(&pkvm_pgd_lock);
- return check_page_state_range(&pkvm_pgtable, addr, size, &d);
-}
-
-static int hyp_request_donation(u64 *completer_addr,
- const struct pkvm_mem_transition *tx)
-{
- u64 size = tx->nr_pages * PAGE_SIZE;
- u64 addr = tx->initiator.addr;
-
- *completer_addr = tx->initiator.hyp.completer_addr;
- return __hyp_check_page_state_range(addr, size, PKVM_PAGE_OWNED);
+ hyp_assert_lock_held(&vm->lock);
+ return check_page_state_range(&vm->pgt, addr, size, &d);
}
-static int hyp_initiate_donation(u64 *completer_addr,
- const struct pkvm_mem_transition *tx)
+int __pkvm_host_share_hyp(u64 pfn)
{
- u64 size = tx->nr_pages * PAGE_SIZE;
+ u64 phys = hyp_pfn_to_phys(pfn);
+ u64 size = PAGE_SIZE;
int ret;
- *completer_addr = tx->initiator.hyp.completer_addr;
- ret = kvm_pgtable_hyp_unmap(&pkvm_pgtable, tx->initiator.addr, size);
- return (ret != size) ? -EFAULT : 0;
-}
+ host_lock_component();
+ hyp_lock_component();
-static bool __hyp_ack_skip_pgtable_check(const struct pkvm_mem_transition *tx)
-{
- return !(IS_ENABLED(CONFIG_NVHE_EL2_DEBUG) ||
- tx->initiator.id != PKVM_ID_HOST);
-}
+ ret = __host_check_page_state_range(phys, size, PKVM_PAGE_OWNED);
+ if (ret)
+ goto unlock;
+ ret = __hyp_check_page_state_range(phys, size, PKVM_NOPAGE);
+ if (ret)
+ goto unlock;
-static int hyp_ack_share(u64 addr, const struct pkvm_mem_transition *tx,
- enum kvm_pgtable_prot perms)
-{
- u64 size = tx->nr_pages * PAGE_SIZE;
+ __hyp_set_page_state_range(phys, size, PKVM_PAGE_SHARED_BORROWED);
+ WARN_ON(__host_set_page_state_range(phys, size, PKVM_PAGE_SHARED_OWNED));
- if (perms != PAGE_HYP)
- return -EPERM;
-
- if (__hyp_ack_skip_pgtable_check(tx))
- return 0;
+unlock:
+ hyp_unlock_component();
+ host_unlock_component();
- return __hyp_check_page_state_range(addr, size, PKVM_NOPAGE);
+ return ret;
}
-static int hyp_ack_unshare(u64 addr, const struct pkvm_mem_transition *tx)
+int __pkvm_host_unshare_hyp(u64 pfn)
{
- u64 size = tx->nr_pages * PAGE_SIZE;
-
- if (tx->initiator.id == PKVM_ID_HOST && hyp_page_count((void *)addr))
- return -EBUSY;
+ u64 phys = hyp_pfn_to_phys(pfn);
+ u64 virt = (u64)__hyp_va(phys);
+ u64 size = PAGE_SIZE;
+ int ret;
- if (__hyp_ack_skip_pgtable_check(tx))
- return 0;
+ host_lock_component();
+ hyp_lock_component();
- return __hyp_check_page_state_range(addr, size,
- PKVM_PAGE_SHARED_BORROWED);
-}
+ ret = __host_check_page_state_range(phys, size, PKVM_PAGE_SHARED_OWNED);
+ if (ret)
+ goto unlock;
+ ret = __hyp_check_page_state_range(phys, size, PKVM_PAGE_SHARED_BORROWED);
+ if (ret)
+ goto unlock;
+ if (hyp_page_count((void *)virt)) {
+ ret = -EBUSY;
+ goto unlock;
+ }
-static int hyp_ack_donation(u64 addr, const struct pkvm_mem_transition *tx)
-{
- u64 size = tx->nr_pages * PAGE_SIZE;
+ __hyp_set_page_state_range(phys, size, PKVM_NOPAGE);
+ WARN_ON(__host_set_page_state_range(phys, size, PKVM_PAGE_OWNED));
- if (__hyp_ack_skip_pgtable_check(tx))
- return 0;
+unlock:
+ hyp_unlock_component();
+ host_unlock_component();
- return __hyp_check_page_state_range(addr, size, PKVM_NOPAGE);
+ return ret;
}
-static int hyp_complete_share(u64 addr, const struct pkvm_mem_transition *tx,
- enum kvm_pgtable_prot perms)
+int __pkvm_host_donate_hyp(u64 pfn, u64 nr_pages)
{
- void *start = (void *)addr, *end = start + (tx->nr_pages * PAGE_SIZE);
- enum kvm_pgtable_prot prot;
+ u64 phys = hyp_pfn_to_phys(pfn);
+ u64 size = PAGE_SIZE * nr_pages;
+ void *virt = __hyp_va(phys);
+ int ret;
- prot = pkvm_mkstate(perms, PKVM_PAGE_SHARED_BORROWED);
- return pkvm_create_mappings_locked(start, end, prot);
-}
+ host_lock_component();
+ hyp_lock_component();
-static int hyp_complete_unshare(u64 addr, const struct pkvm_mem_transition *tx)
-{
- u64 size = tx->nr_pages * PAGE_SIZE;
- int ret = kvm_pgtable_hyp_unmap(&pkvm_pgtable, addr, size);
+ ret = __host_check_page_state_range(phys, size, PKVM_PAGE_OWNED);
+ if (ret)
+ goto unlock;
+ ret = __hyp_check_page_state_range(phys, size, PKVM_NOPAGE);
+ if (ret)
+ goto unlock;
- return (ret != size) ? -EFAULT : 0;
-}
+ __hyp_set_page_state_range(phys, size, PKVM_PAGE_OWNED);
+ WARN_ON(pkvm_create_mappings_locked(virt, virt + size, PAGE_HYP));
+ WARN_ON(host_stage2_set_owner_locked(phys, size, PKVM_ID_HYP));
-static int hyp_complete_donation(u64 addr,
- const struct pkvm_mem_transition *tx)
-{
- void *start = (void *)addr, *end = start + (tx->nr_pages * PAGE_SIZE);
- enum kvm_pgtable_prot prot = pkvm_mkstate(PAGE_HYP, PKVM_PAGE_OWNED);
+unlock:
+ hyp_unlock_component();
+ host_unlock_component();
- return pkvm_create_mappings_locked(start, end, prot);
+ return ret;
}
-static int check_share(struct pkvm_mem_share *share)
+int __pkvm_hyp_donate_host(u64 pfn, u64 nr_pages)
{
- const struct pkvm_mem_transition *tx = &share->tx;
- u64 completer_addr;
+ u64 phys = hyp_pfn_to_phys(pfn);
+ u64 size = PAGE_SIZE * nr_pages;
+ u64 virt = (u64)__hyp_va(phys);
int ret;
- switch (tx->initiator.id) {
- case PKVM_ID_HOST:
- ret = host_request_owned_transition(&completer_addr, tx);
- break;
- default:
- ret = -EINVAL;
- }
+ host_lock_component();
+ hyp_lock_component();
+ ret = __hyp_check_page_state_range(phys, size, PKVM_PAGE_OWNED);
if (ret)
- return ret;
+ goto unlock;
+ ret = __host_check_page_state_range(phys, size, PKVM_NOPAGE);
+ if (ret)
+ goto unlock;
- switch (tx->completer.id) {
- case PKVM_ID_HYP:
- ret = hyp_ack_share(completer_addr, tx, share->completer_prot);
- break;
- case PKVM_ID_FFA:
- /*
- * We only check the host; the secure side will check the other
- * end when we forward the FFA call.
- */
- ret = 0;
- break;
- default:
- ret = -EINVAL;
- }
+ __hyp_set_page_state_range(phys, size, PKVM_NOPAGE);
+ WARN_ON(kvm_pgtable_hyp_unmap(&pkvm_pgtable, virt, size) != size);
+ WARN_ON(host_stage2_set_owner_locked(phys, size, PKVM_ID_HOST));
+
+unlock:
+ hyp_unlock_component();
+ host_unlock_component();
return ret;
}
-static int __do_share(struct pkvm_mem_share *share)
+int hyp_pin_shared_mem(void *from, void *to)
{
- const struct pkvm_mem_transition *tx = &share->tx;
- u64 completer_addr;
+ u64 cur, start = ALIGN_DOWN((u64)from, PAGE_SIZE);
+ u64 end = PAGE_ALIGN((u64)to);
+ u64 phys = __hyp_pa(start);
+ u64 size = end - start;
+ struct hyp_page *p;
int ret;
- switch (tx->initiator.id) {
- case PKVM_ID_HOST:
- ret = host_initiate_share(&completer_addr, tx);
- break;
- default:
- ret = -EINVAL;
- }
+ host_lock_component();
+ hyp_lock_component();
+ ret = __host_check_page_state_range(phys, size, PKVM_PAGE_SHARED_OWNED);
if (ret)
- return ret;
+ goto unlock;
- switch (tx->completer.id) {
- case PKVM_ID_HYP:
- ret = hyp_complete_share(completer_addr, tx, share->completer_prot);
- break;
- case PKVM_ID_FFA:
- /*
- * We're not responsible for any secure page-tables, so there's
- * nothing to do here.
- */
- ret = 0;
- break;
- default:
- ret = -EINVAL;
+ ret = __hyp_check_page_state_range(phys, size, PKVM_PAGE_SHARED_BORROWED);
+ if (ret)
+ goto unlock;
+
+ for (cur = start; cur < end; cur += PAGE_SIZE) {
+ p = hyp_virt_to_page(cur);
+ hyp_page_ref_inc(p);
+ if (p->refcount == 1)
+ WARN_ON(pkvm_create_mappings_locked((void *)cur,
+ (void *)cur + PAGE_SIZE,
+ PAGE_HYP));
}
+unlock:
+ hyp_unlock_component();
+ host_unlock_component();
+
return ret;
}
-/*
- * do_share():
- *
- * The page owner grants access to another component with a given set
- * of permissions.
- *
- * Initiator: OWNED => SHARED_OWNED
- * Completer: NOPAGE => SHARED_BORROWED
- */
-static int do_share(struct pkvm_mem_share *share)
+void hyp_unpin_shared_mem(void *from, void *to)
{
- int ret;
+ u64 cur, start = ALIGN_DOWN((u64)from, PAGE_SIZE);
+ u64 end = PAGE_ALIGN((u64)to);
+ struct hyp_page *p;
- ret = check_share(share);
- if (ret)
- return ret;
+ host_lock_component();
+ hyp_lock_component();
+
+ for (cur = start; cur < end; cur += PAGE_SIZE) {
+ p = hyp_virt_to_page(cur);
+ if (p->refcount == 1)
+ WARN_ON(kvm_pgtable_hyp_unmap(&pkvm_pgtable, cur, PAGE_SIZE) != PAGE_SIZE);
+ hyp_page_ref_dec(p);
+ }
- return WARN_ON(__do_share(share));
+ hyp_unlock_component();
+ host_unlock_component();
}
-static int check_unshare(struct pkvm_mem_share *share)
+int __pkvm_host_share_ffa(u64 pfn, u64 nr_pages)
{
- const struct pkvm_mem_transition *tx = &share->tx;
- u64 completer_addr;
+ u64 phys = hyp_pfn_to_phys(pfn);
+ u64 size = PAGE_SIZE * nr_pages;
int ret;
- switch (tx->initiator.id) {
- case PKVM_ID_HOST:
- ret = host_request_unshare(&completer_addr, tx);
- break;
- default:
- ret = -EINVAL;
- }
+ host_lock_component();
+ ret = __host_check_page_state_range(phys, size, PKVM_PAGE_OWNED);
+ if (!ret)
+ ret = __host_set_page_state_range(phys, size, PKVM_PAGE_SHARED_OWNED);
+ host_unlock_component();
- if (ret)
- return ret;
+ return ret;
+}
- switch (tx->completer.id) {
- case PKVM_ID_HYP:
- ret = hyp_ack_unshare(completer_addr, tx);
- break;
- case PKVM_ID_FFA:
- /* See check_share() */
- ret = 0;
- break;
- default:
- ret = -EINVAL;
- }
+int __pkvm_host_unshare_ffa(u64 pfn, u64 nr_pages)
+{
+ u64 phys = hyp_pfn_to_phys(pfn);
+ u64 size = PAGE_SIZE * nr_pages;
+ int ret;
+
+ host_lock_component();
+ ret = __host_check_page_state_range(phys, size, PKVM_PAGE_SHARED_OWNED);
+ if (!ret)
+ ret = __host_set_page_state_range(phys, size, PKVM_PAGE_OWNED);
+ host_unlock_component();
return ret;
}
-static int __do_unshare(struct pkvm_mem_share *share)
+static int __guest_check_transition_size(u64 phys, u64 ipa, u64 nr_pages, u64 *size)
{
- const struct pkvm_mem_transition *tx = &share->tx;
- u64 completer_addr;
- int ret;
+ size_t block_size;
- switch (tx->initiator.id) {
- case PKVM_ID_HOST:
- ret = host_initiate_unshare(&completer_addr, tx);
- break;
- default:
- ret = -EINVAL;
+ if (nr_pages == 1) {
+ *size = PAGE_SIZE;
+ return 0;
}
- if (ret)
- return ret;
+ /* We solely support second to last level huge mapping */
+ block_size = kvm_granule_size(KVM_PGTABLE_LAST_LEVEL - 1);
- switch (tx->completer.id) {
- case PKVM_ID_HYP:
- ret = hyp_complete_unshare(completer_addr, tx);
- break;
- case PKVM_ID_FFA:
- /* See __do_share() */
- ret = 0;
- break;
- default:
- ret = -EINVAL;
- }
+ if (nr_pages != block_size >> PAGE_SHIFT)
+ return -EINVAL;
- return ret;
+ if (!IS_ALIGNED(phys | ipa, block_size))
+ return -EINVAL;
+
+ *size = block_size;
+ return 0;
}
-/*
- * do_unshare():
- *
- * The page owner revokes access from another component for a range of
- * pages which were previously shared using do_share().
- *
- * Initiator: SHARED_OWNED => OWNED
- * Completer: SHARED_BORROWED => NOPAGE
- */
-static int do_unshare(struct pkvm_mem_share *share)
+int __pkvm_host_share_guest(u64 pfn, u64 gfn, u64 nr_pages, struct pkvm_hyp_vcpu *vcpu,
+ enum kvm_pgtable_prot prot)
{
+ struct pkvm_hyp_vm *vm = pkvm_hyp_vcpu_to_hyp_vm(vcpu);
+ u64 phys = hyp_pfn_to_phys(pfn);
+ u64 ipa = hyp_pfn_to_phys(gfn);
+ u64 size;
int ret;
- ret = check_unshare(share);
+ if (prot & ~KVM_PGTABLE_PROT_RWX)
+ return -EINVAL;
+
+ ret = __guest_check_transition_size(phys, ipa, nr_pages, &size);
if (ret)
return ret;
- return WARN_ON(__do_unshare(share));
-}
-
-static int check_donation(struct pkvm_mem_donation *donation)
-{
- const struct pkvm_mem_transition *tx = &donation->tx;
- u64 completer_addr;
- int ret;
+ ret = check_range_allowed_memory(phys, phys + size);
+ if (ret)
+ return ret;
- switch (tx->initiator.id) {
- case PKVM_ID_HOST:
- ret = host_request_owned_transition(&completer_addr, tx);
- break;
- case PKVM_ID_HYP:
- ret = hyp_request_donation(&completer_addr, tx);
- break;
- default:
- ret = -EINVAL;
- }
+ host_lock_component();
+ guest_lock_component(vm);
+ ret = __guest_check_page_state_range(vm, ipa, size, PKVM_NOPAGE);
if (ret)
- return ret;
+ goto unlock;
- switch (tx->completer.id) {
- case PKVM_ID_HOST:
- ret = host_ack_donation(completer_addr, tx);
- break;
- case PKVM_ID_HYP:
- ret = hyp_ack_donation(completer_addr, tx);
- break;
- default:
- ret = -EINVAL;
+ for_each_hyp_page(page, phys, size) {
+ switch (get_host_state(page)) {
+ case PKVM_PAGE_OWNED:
+ continue;
+ case PKVM_PAGE_SHARED_OWNED:
+ if (page->host_share_guest_count == U32_MAX) {
+ ret = -EBUSY;
+ goto unlock;
+ }
+
+ /* Only host to np-guest multi-sharing is tolerated */
+ if (page->host_share_guest_count)
+ continue;
+
+ fallthrough;
+ default:
+ ret = -EPERM;
+ goto unlock;
+ }
}
+ for_each_hyp_page(page, phys, size) {
+ set_host_state(page, PKVM_PAGE_SHARED_OWNED);
+ page->host_share_guest_count++;
+ }
+
+ WARN_ON(kvm_pgtable_stage2_map(&vm->pgt, ipa, size, phys,
+ pkvm_mkstate(prot, PKVM_PAGE_SHARED_BORROWED),
+ &vcpu->vcpu.arch.pkvm_memcache, 0));
+
+unlock:
+ guest_unlock_component(vm);
+ host_unlock_component();
+
return ret;
}
-static int __do_donate(struct pkvm_mem_donation *donation)
+static int __check_host_shared_guest(struct pkvm_hyp_vm *vm, u64 *__phys, u64 ipa, u64 size)
{
- const struct pkvm_mem_transition *tx = &donation->tx;
- u64 completer_addr;
+ enum pkvm_page_state state;
+ kvm_pte_t pte;
+ u64 phys;
+ s8 level;
int ret;
- switch (tx->initiator.id) {
- case PKVM_ID_HOST:
- ret = host_initiate_donation(&completer_addr, tx);
- break;
- case PKVM_ID_HYP:
- ret = hyp_initiate_donation(&completer_addr, tx);
- break;
- default:
- ret = -EINVAL;
- }
-
+ ret = kvm_pgtable_get_leaf(&vm->pgt, ipa, &pte, &level);
if (ret)
return ret;
+ if (!kvm_pte_valid(pte))
+ return -ENOENT;
+ if (kvm_granule_size(level) != size)
+ return -E2BIG;
+
+ state = guest_get_page_state(pte, ipa);
+ if (state != PKVM_PAGE_SHARED_BORROWED)
+ return -EPERM;
+
+ phys = kvm_pte_to_phys(pte);
+ ret = check_range_allowed_memory(phys, phys + size);
+ if (WARN_ON(ret))
+ return ret;
- switch (tx->completer.id) {
- case PKVM_ID_HOST:
- ret = host_complete_donation(completer_addr, tx);
- break;
- case PKVM_ID_HYP:
- ret = hyp_complete_donation(completer_addr, tx);
- break;
- default:
- ret = -EINVAL;
+ for_each_hyp_page(page, phys, size) {
+ if (get_host_state(page) != PKVM_PAGE_SHARED_OWNED)
+ return -EPERM;
+ if (WARN_ON(!page->host_share_guest_count))
+ return -EINVAL;
}
- return ret;
+ *__phys = phys;
+
+ return 0;
}
-/*
- * do_donate():
- *
- * The page owner transfers ownership to another component, losing access
- * as a consequence.
- *
- * Initiator: OWNED => NOPAGE
- * Completer: NOPAGE => OWNED
- */
-static int do_donate(struct pkvm_mem_donation *donation)
+int __pkvm_host_unshare_guest(u64 gfn, u64 nr_pages, struct pkvm_hyp_vm *vm)
{
+ u64 ipa = hyp_pfn_to_phys(gfn);
+ u64 size, phys;
int ret;
- ret = check_donation(donation);
+ ret = __guest_check_transition_size(0, ipa, nr_pages, &size);
if (ret)
return ret;
- return WARN_ON(__do_donate(donation));
-}
+ host_lock_component();
+ guest_lock_component(vm);
-int __pkvm_host_share_hyp(u64 pfn)
-{
- int ret;
- u64 host_addr = hyp_pfn_to_phys(pfn);
- u64 hyp_addr = (u64)__hyp_va(host_addr);
- struct pkvm_mem_share share = {
- .tx = {
- .nr_pages = 1,
- .initiator = {
- .id = PKVM_ID_HOST,
- .addr = host_addr,
- .host = {
- .completer_addr = hyp_addr,
- },
- },
- .completer = {
- .id = PKVM_ID_HYP,
- },
- },
- .completer_prot = PAGE_HYP,
- };
+ ret = __check_host_shared_guest(vm, &phys, ipa, size);
+ if (ret)
+ goto unlock;
- host_lock_component();
- hyp_lock_component();
+ ret = kvm_pgtable_stage2_unmap(&vm->pgt, ipa, size);
+ if (ret)
+ goto unlock;
- ret = do_share(&share);
+ for_each_hyp_page(page, phys, size) {
+ /* __check_host_shared_guest() protects against underflow */
+ page->host_share_guest_count--;
+ if (!page->host_share_guest_count)
+ set_host_state(page, PKVM_PAGE_OWNED);
+ }
- hyp_unlock_component();
+unlock:
+ guest_unlock_component(vm);
host_unlock_component();
return ret;
}
-int __pkvm_host_unshare_hyp(u64 pfn)
+static void assert_host_shared_guest(struct pkvm_hyp_vm *vm, u64 ipa, u64 size)
{
+ u64 phys;
int ret;
- u64 host_addr = hyp_pfn_to_phys(pfn);
- u64 hyp_addr = (u64)__hyp_va(host_addr);
- struct pkvm_mem_share share = {
- .tx = {
- .nr_pages = 1,
- .initiator = {
- .id = PKVM_ID_HOST,
- .addr = host_addr,
- .host = {
- .completer_addr = hyp_addr,
- },
- },
- .completer = {
- .id = PKVM_ID_HYP,
- },
- },
- .completer_prot = PAGE_HYP,
- };
+
+ if (!IS_ENABLED(CONFIG_NVHE_EL2_DEBUG))
+ return;
host_lock_component();
- hyp_lock_component();
+ guest_lock_component(vm);
- ret = do_unshare(&share);
+ ret = __check_host_shared_guest(vm, &phys, ipa, size);
- hyp_unlock_component();
+ guest_unlock_component(vm);
host_unlock_component();
- return ret;
+ WARN_ON(ret && ret != -ENOENT);
}
-int __pkvm_host_donate_hyp(u64 pfn, u64 nr_pages)
+int __pkvm_host_relax_perms_guest(u64 gfn, struct pkvm_hyp_vcpu *vcpu, enum kvm_pgtable_prot prot)
{
+ struct pkvm_hyp_vm *vm = pkvm_hyp_vcpu_to_hyp_vm(vcpu);
+ u64 ipa = hyp_pfn_to_phys(gfn);
int ret;
- u64 host_addr = hyp_pfn_to_phys(pfn);
- u64 hyp_addr = (u64)__hyp_va(host_addr);
- struct pkvm_mem_donation donation = {
- .tx = {
- .nr_pages = nr_pages,
- .initiator = {
- .id = PKVM_ID_HOST,
- .addr = host_addr,
- .host = {
- .completer_addr = hyp_addr,
- },
- },
- .completer = {
- .id = PKVM_ID_HYP,
- },
- },
- };
- host_lock_component();
- hyp_lock_component();
+ if (pkvm_hyp_vm_is_protected(vm))
+ return -EPERM;
- ret = do_donate(&donation);
+ if (prot & ~KVM_PGTABLE_PROT_RWX)
+ return -EINVAL;
- hyp_unlock_component();
- host_unlock_component();
+ assert_host_shared_guest(vm, ipa, PAGE_SIZE);
+ guest_lock_component(vm);
+ ret = kvm_pgtable_stage2_relax_perms(&vm->pgt, ipa, prot, 0);
+ guest_unlock_component(vm);
return ret;
}
-int __pkvm_hyp_donate_host(u64 pfn, u64 nr_pages)
+int __pkvm_host_wrprotect_guest(u64 gfn, u64 nr_pages, struct pkvm_hyp_vm *vm)
{
+ u64 size, ipa = hyp_pfn_to_phys(gfn);
int ret;
- u64 host_addr = hyp_pfn_to_phys(pfn);
- u64 hyp_addr = (u64)__hyp_va(host_addr);
- struct pkvm_mem_donation donation = {
- .tx = {
- .nr_pages = nr_pages,
- .initiator = {
- .id = PKVM_ID_HYP,
- .addr = hyp_addr,
- .hyp = {
- .completer_addr = host_addr,
- },
- },
- .completer = {
- .id = PKVM_ID_HOST,
- },
- },
- };
- host_lock_component();
- hyp_lock_component();
+ if (pkvm_hyp_vm_is_protected(vm))
+ return -EPERM;
- ret = do_donate(&donation);
+ ret = __guest_check_transition_size(0, ipa, nr_pages, &size);
+ if (ret)
+ return ret;
- hyp_unlock_component();
- host_unlock_component();
+ assert_host_shared_guest(vm, ipa, size);
+ guest_lock_component(vm);
+ ret = kvm_pgtable_stage2_wrprotect(&vm->pgt, ipa, size);
+ guest_unlock_component(vm);
return ret;
}
-int hyp_pin_shared_mem(void *from, void *to)
+int __pkvm_host_test_clear_young_guest(u64 gfn, u64 nr_pages, bool mkold, struct pkvm_hyp_vm *vm)
{
- u64 cur, start = ALIGN_DOWN((u64)from, PAGE_SIZE);
- u64 end = PAGE_ALIGN((u64)to);
- u64 size = end - start;
+ u64 size, ipa = hyp_pfn_to_phys(gfn);
int ret;
- host_lock_component();
- hyp_lock_component();
-
- ret = __host_check_page_state_range(__hyp_pa(start), size,
- PKVM_PAGE_SHARED_OWNED);
- if (ret)
- goto unlock;
+ if (pkvm_hyp_vm_is_protected(vm))
+ return -EPERM;
- ret = __hyp_check_page_state_range(start, size,
- PKVM_PAGE_SHARED_BORROWED);
+ ret = __guest_check_transition_size(0, ipa, nr_pages, &size);
if (ret)
- goto unlock;
-
- for (cur = start; cur < end; cur += PAGE_SIZE)
- hyp_page_ref_inc(hyp_virt_to_page(cur));
+ return ret;
-unlock:
- hyp_unlock_component();
- host_unlock_component();
+ assert_host_shared_guest(vm, ipa, size);
+ guest_lock_component(vm);
+ ret = kvm_pgtable_stage2_test_clear_young(&vm->pgt, ipa, size, mkold);
+ guest_unlock_component(vm);
return ret;
}
-void hyp_unpin_shared_mem(void *from, void *to)
+int __pkvm_host_mkyoung_guest(u64 gfn, struct pkvm_hyp_vcpu *vcpu)
{
- u64 cur, start = ALIGN_DOWN((u64)from, PAGE_SIZE);
- u64 end = PAGE_ALIGN((u64)to);
+ struct pkvm_hyp_vm *vm = pkvm_hyp_vcpu_to_hyp_vm(vcpu);
+ u64 ipa = hyp_pfn_to_phys(gfn);
- host_lock_component();
- hyp_lock_component();
+ if (pkvm_hyp_vm_is_protected(vm))
+ return -EPERM;
- for (cur = start; cur < end; cur += PAGE_SIZE)
- hyp_page_ref_dec(hyp_virt_to_page(cur));
+ assert_host_shared_guest(vm, ipa, PAGE_SIZE);
+ guest_lock_component(vm);
+ kvm_pgtable_stage2_mkyoung(&vm->pgt, ipa, 0);
+ guest_unlock_component(vm);
- hyp_unlock_component();
- host_unlock_component();
+ return 0;
}
-int __pkvm_host_share_ffa(u64 pfn, u64 nr_pages)
-{
- int ret;
- struct pkvm_mem_share share = {
- .tx = {
- .nr_pages = nr_pages,
- .initiator = {
- .id = PKVM_ID_HOST,
- .addr = hyp_pfn_to_phys(pfn),
- },
- .completer = {
- .id = PKVM_ID_FFA,
+#ifdef CONFIG_NVHE_EL2_DEBUG
+struct pkvm_expected_state {
+ enum pkvm_page_state host;
+ enum pkvm_page_state hyp;
+ enum pkvm_page_state guest[2]; /* [ gfn, gfn + 1 ] */
+};
+
+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,
},
},
- };
+ },
+};
- host_lock_component();
- ret = do_share(&share);
- host_unlock_component();
+static struct pkvm_hyp_vcpu selftest_vcpu = {
+ .vcpu = {
+ .arch = {
+ .hw_mmu = &selftest_vm.kvm.arch.mmu,
+ },
+ .kvm = &selftest_vm.kvm,
+ },
+};
- return ret;
+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]));
+ }
}
-int __pkvm_host_unshare_ffa(u64 pfn, u64 nr_pages)
+static u64 selftest_ipa(void)
{
- int ret;
- struct pkvm_mem_share share = {
- .tx = {
- .nr_pages = nr_pages,
- .initiator = {
- .id = PKVM_ID_HOST,
- .addr = hyp_pfn_to_phys(pfn),
- },
- .completer = {
- .id = PKVM_ID_FFA,
- },
- },
- };
+ return BIT(selftest_vm.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;
+ u64 phys = hyp_virt_to_phys(virt);
+ u64 ipa[2] = { selftest_ipa(), selftest_ipa() + PAGE_SIZE };
+ struct pkvm_hyp_vm *vm;
+
+ vm = pkvm_hyp_vcpu_to_hyp_vm(vcpu);
host_lock_component();
- ret = do_unshare(&share);
+ WARN_ON(__host_check_page_state_range(phys, size, selftest_state.host));
host_unlock_component();
- return ret;
-}
+ hyp_lock_component();
+ WARN_ON(__hyp_check_page_state_range(phys, size, selftest_state.hyp));
+ hyp_unlock_component();
+
+ guest_lock_component(&selftest_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);
+}
+
+#define assert_transition_res(res, fn, ...) \
+ do { \
+ WARN_ON(fn(__VA_ARGS__) != res); \
+ assert_page_state(); \
+ } while (0)
+
+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;
+ u64 phys, size, pfn, gfn;
+
+ WARN_ON(!virt);
+ selftest_page = hyp_virt_to_page(virt);
+ selftest_page->refcount = 0;
+ init_selftest_vm(base);
+
+ size = PAGE_SIZE << selftest_page->order;
+ phys = hyp_virt_to_phys(virt);
+ pfn = hyp_phys_to_pfn(phys);
+ gfn = hyp_phys_to_pfn(selftest_ipa());
+
+ selftest_state.host = PKVM_NOPAGE;
+ selftest_state.hyp = PKVM_PAGE_OWNED;
+ selftest_state.guest[0] = selftest_state.guest[1] = PKVM_NOPAGE;
+ assert_page_state();
+ assert_transition_res(-EPERM, __pkvm_host_donate_hyp, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_host_share_hyp, pfn);
+ assert_transition_res(-EPERM, __pkvm_host_unshare_hyp, pfn);
+ assert_transition_res(-EPERM, __pkvm_host_share_ffa, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_host_unshare_ffa, pfn, 1);
+ assert_transition_res(-EPERM, hyp_pin_shared_mem, virt, virt + size);
+ assert_transition_res(-EPERM, __pkvm_host_share_guest, pfn, gfn, 1, vcpu, prot);
+ assert_transition_res(-ENOENT, __pkvm_host_unshare_guest, gfn, 1, vm);
+
+ selftest_state.host = PKVM_PAGE_OWNED;
+ selftest_state.hyp = PKVM_NOPAGE;
+ assert_transition_res(0, __pkvm_hyp_donate_host, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_hyp_donate_host, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_host_unshare_hyp, pfn);
+ assert_transition_res(-EPERM, __pkvm_host_unshare_ffa, pfn, 1);
+ assert_transition_res(-ENOENT, __pkvm_host_unshare_guest, gfn, 1, vm);
+ assert_transition_res(-EPERM, hyp_pin_shared_mem, virt, virt + size);
+
+ selftest_state.host = PKVM_PAGE_SHARED_OWNED;
+ selftest_state.hyp = PKVM_PAGE_SHARED_BORROWED;
+ assert_transition_res(0, __pkvm_host_share_hyp, pfn);
+ assert_transition_res(-EPERM, __pkvm_host_share_hyp, pfn);
+ assert_transition_res(-EPERM, __pkvm_host_donate_hyp, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_host_share_ffa, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_hyp_donate_host, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_host_share_guest, pfn, gfn, 1, vcpu, prot);
+ assert_transition_res(-ENOENT, __pkvm_host_unshare_guest, gfn, 1, vm);
+
+ assert_transition_res(0, hyp_pin_shared_mem, virt, virt + size);
+ assert_transition_res(0, hyp_pin_shared_mem, virt, virt + size);
+ hyp_unpin_shared_mem(virt, virt + size);
+ WARN_ON(hyp_page_count(virt) != 1);
+ assert_transition_res(-EBUSY, __pkvm_host_unshare_hyp, pfn);
+ assert_transition_res(-EPERM, __pkvm_host_share_hyp, pfn);
+ assert_transition_res(-EPERM, __pkvm_host_donate_hyp, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_host_share_ffa, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_hyp_donate_host, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_host_share_guest, pfn, gfn, 1, vcpu, prot);
+ assert_transition_res(-ENOENT, __pkvm_host_unshare_guest, gfn, 1, vm);
+
+ hyp_unpin_shared_mem(virt, virt + size);
+ assert_page_state();
+ WARN_ON(hyp_page_count(virt));
+
+ selftest_state.host = PKVM_PAGE_OWNED;
+ selftest_state.hyp = PKVM_NOPAGE;
+ assert_transition_res(0, __pkvm_host_unshare_hyp, pfn);
+
+ selftest_state.host = PKVM_PAGE_SHARED_OWNED;
+ selftest_state.hyp = PKVM_NOPAGE;
+ assert_transition_res(0, __pkvm_host_share_ffa, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_host_share_ffa, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_host_donate_hyp, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_host_share_hyp, pfn);
+ assert_transition_res(-EPERM, __pkvm_host_unshare_hyp, pfn);
+ assert_transition_res(-EPERM, __pkvm_hyp_donate_host, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_host_share_guest, pfn, gfn, 1, vcpu, prot);
+ assert_transition_res(-ENOENT, __pkvm_host_unshare_guest, gfn, 1, vm);
+ assert_transition_res(-EPERM, hyp_pin_shared_mem, virt, virt + size);
+
+ selftest_state.host = PKVM_PAGE_OWNED;
+ selftest_state.hyp = PKVM_NOPAGE;
+ assert_transition_res(0, __pkvm_host_unshare_ffa, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_host_unshare_ffa, pfn, 1);
+
+ selftest_state.host = PKVM_PAGE_SHARED_OWNED;
+ selftest_state.guest[0] = PKVM_PAGE_SHARED_BORROWED;
+ assert_transition_res(0, __pkvm_host_share_guest, pfn, gfn, 1, vcpu, prot);
+ assert_transition_res(-EPERM, __pkvm_host_share_guest, pfn, gfn, 1, vcpu, prot);
+ assert_transition_res(-EPERM, __pkvm_host_share_ffa, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_host_donate_hyp, pfn, 1);
+ assert_transition_res(-EPERM, __pkvm_host_share_hyp, pfn);
+ assert_transition_res(-EPERM, __pkvm_host_unshare_hyp, pfn);
+ assert_transition_res(-EPERM, __pkvm_hyp_donate_host, pfn, 1);
+ assert_transition_res(-EPERM, hyp_pin_shared_mem, virt, virt + size);
+
+ selftest_state.guest[1] = PKVM_PAGE_SHARED_BORROWED;
+ assert_transition_res(0, __pkvm_host_share_guest, pfn, gfn + 1, 1, vcpu, prot);
+ WARN_ON(hyp_virt_to_page(virt)->host_share_guest_count != 2);
+
+ selftest_state.guest[0] = PKVM_NOPAGE;
+ assert_transition_res(0, __pkvm_host_unshare_guest, gfn, 1, vm);
+
+ selftest_state.guest[1] = PKVM_NOPAGE;
+ selftest_state.host = PKVM_PAGE_OWNED;
+ assert_transition_res(0, __pkvm_host_unshare_guest, gfn + 1, 1, vm);
+
+ selftest_state.host = PKVM_NOPAGE;
+ selftest_state.hyp = PKVM_PAGE_OWNED;
+ assert_transition_res(0, __pkvm_host_donate_hyp, pfn, 1);
+
+ selftest_page->refcount = 1;
+ hyp_put_page(&host_s2_pool, virt);
+}
+#endif
generated by cgit (git 2.34.1) at 2025-07-23 13:24:51 +0000