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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.c1263
1 files changed, 1190 insertions, 73 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
index d938ce95d3bd..49db32f3ddf7 100644
--- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c
+++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
@@ -9,9 +9,10 @@
#include <asm/kvm_hyp.h>
#include <asm/kvm_mmu.h>
#include <asm/kvm_pgtable.h>
+#include <asm/kvm_pkvm.h>
#include <asm/stage2_pgtable.h>
-#include <hyp/switch.h>
+#include <hyp/fault.h>
#include <nvhe/gfp.h>
#include <nvhe/memory.h>
@@ -20,22 +21,64 @@
#define KVM_HOST_S2_FLAGS (KVM_PGTABLE_S2_NOFWB | KVM_PGTABLE_S2_IDMAP)
-extern unsigned long hyp_nr_cpus;
-struct host_kvm host_kvm;
+struct host_mmu host_mmu;
static struct hyp_pool host_s2_pool;
-/*
- * Copies of the host's CPU features registers holding sanitized values.
- */
-u64 id_aa64mmfr0_el1_sys_val;
-u64 id_aa64mmfr1_el1_sys_val;
+static DEFINE_PER_CPU(struct pkvm_hyp_vm *, __current_vm);
+#define current_vm (*this_cpu_ptr(&__current_vm))
+
+static void guest_lock_component(struct pkvm_hyp_vm *vm)
+{
+ hyp_spin_lock(&vm->lock);
+ current_vm = vm;
+}
+
+static void guest_unlock_component(struct pkvm_hyp_vm *vm)
+{
+ current_vm = NULL;
+ hyp_spin_unlock(&vm->lock);
+}
-static const u8 pkvm_hyp_id = 1;
+static void host_lock_component(void)
+{
+ hyp_spin_lock(&host_mmu.lock);
+}
+
+static void host_unlock_component(void)
+{
+ hyp_spin_unlock(&host_mmu.lock);
+}
+
+static void hyp_lock_component(void)
+{
+ hyp_spin_lock(&pkvm_pgd_lock);
+}
+
+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)
{
- return hyp_alloc_pages(&host_s2_pool, get_order(size));
+ void *addr = hyp_alloc_pages(&host_s2_pool, get_order(size));
+
+ hyp_split_page(hyp_virt_to_page(addr));
+
+ /*
+ * The size of concatenated PGDs is always a power of two of PAGE_SIZE,
+ * so there should be no need to free any of the tail pages to make the
+ * allocation exact.
+ */
+ WARN_ON(size != (PAGE_SIZE << get_order(size)));
+
+ return addr;
}
static void *host_s2_zalloc_page(void *pool)
@@ -53,6 +96,11 @@ static void host_s2_put_page(void *addr)
hyp_put_page(&host_s2_pool, addr);
}
+static void host_s2_free_unlinked_table(void *addr, s8 level)
+{
+ kvm_pgtable_stage2_free_unlinked(&host_mmu.mm_ops, addr, level);
+}
+
static int prepare_s2_pool(void *pgt_pool_base)
{
unsigned long nr_pages, pfn;
@@ -64,9 +112,10 @@ static int prepare_s2_pool(void *pgt_pool_base)
if (ret)
return ret;
- host_kvm.mm_ops = (struct kvm_pgtable_mm_ops) {
+ host_mmu.mm_ops = (struct kvm_pgtable_mm_ops) {
.zalloc_pages_exact = host_s2_zalloc_pages_exact,
.zalloc_page = host_s2_zalloc_page,
+ .free_unlinked_table = host_s2_free_unlinked_table,
.phys_to_virt = hyp_phys_to_virt,
.virt_to_phys = hyp_virt_to_phys,
.page_count = hyp_page_count,
@@ -85,48 +134,207 @@ static void prepare_host_vtcr(void)
parange = kvm_get_parange(id_aa64mmfr0_el1_sys_val);
phys_shift = id_aa64mmfr0_parange_to_phys_shift(parange);
- host_kvm.arch.vtcr = kvm_get_vtcr(id_aa64mmfr0_el1_sys_val,
- id_aa64mmfr1_el1_sys_val, phys_shift);
+ host_mmu.arch.mmu.vtcr = kvm_get_vtcr(id_aa64mmfr0_el1_sys_val,
+ id_aa64mmfr1_el1_sys_val, phys_shift);
}
+static bool host_stage2_force_pte_cb(u64 addr, u64 end, enum kvm_pgtable_prot prot);
+
int kvm_host_prepare_stage2(void *pgt_pool_base)
{
- struct kvm_s2_mmu *mmu = &host_kvm.arch.mmu;
+ struct kvm_s2_mmu *mmu = &host_mmu.arch.mmu;
int ret;
prepare_host_vtcr();
- hyp_spin_lock_init(&host_kvm.lock);
+ hyp_spin_lock_init(&host_mmu.lock);
+ mmu->arch = &host_mmu.arch;
ret = prepare_s2_pool(pgt_pool_base);
if (ret)
return ret;
- ret = kvm_pgtable_stage2_init_flags(&host_kvm.pgt, &host_kvm.arch,
- &host_kvm.mm_ops, KVM_HOST_S2_FLAGS);
+ ret = __kvm_pgtable_stage2_init(&host_mmu.pgt, mmu,
+ &host_mmu.mm_ops, KVM_HOST_S2_FLAGS,
+ host_stage2_force_pte_cb);
if (ret)
return ret;
- mmu->pgd_phys = __hyp_pa(host_kvm.pgt.pgd);
- mmu->arch = &host_kvm.arch;
- mmu->pgt = &host_kvm.pgt;
- mmu->vmid.vmid_gen = 0;
- mmu->vmid.vmid = 0;
+ mmu->pgd_phys = __hyp_pa(host_mmu.pgt.pgd);
+ mmu->pgt = &host_mmu.pgt;
+ atomic64_set(&mmu->vmid.id, 0);
return 0;
}
+static void *guest_s2_zalloc_pages_exact(size_t size)
+{
+ void *addr = hyp_alloc_pages(&current_vm->pool, get_order(size));
+
+ WARN_ON(size != (PAGE_SIZE << get_order(size)));
+ hyp_split_page(hyp_virt_to_page(addr));
+
+ return addr;
+}
+
+static void guest_s2_free_pages_exact(void *addr, unsigned long size)
+{
+ u8 order = get_order(size);
+ unsigned int i;
+
+ for (i = 0; i < (1 << order); i++)
+ hyp_put_page(&current_vm->pool, addr + (i * PAGE_SIZE));
+}
+
+static void *guest_s2_zalloc_page(void *mc)
+{
+ struct hyp_page *p;
+ void *addr;
+
+ addr = hyp_alloc_pages(&current_vm->pool, 0);
+ if (addr)
+ return addr;
+
+ addr = pop_hyp_memcache(mc, hyp_phys_to_virt);
+ if (!addr)
+ return addr;
+
+ memset(addr, 0, PAGE_SIZE);
+ p = hyp_virt_to_page(addr);
+ p->refcount = 1;
+ p->order = 0;
+
+ return addr;
+}
+
+static void guest_s2_get_page(void *addr)
+{
+ hyp_get_page(&current_vm->pool, addr);
+}
+
+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)
+{
+ __apply_guest_page(va, size, __clean_dcache_guest_page);
+}
+
+static void invalidate_icache_guest_page(void *va, size_t size)
+{
+ __apply_guest_page(va, size, __invalidate_icache_guest_page);
+}
+
+int kvm_guest_prepare_stage2(struct pkvm_hyp_vm *vm, void *pgd)
+{
+ struct kvm_s2_mmu *mmu = &vm->kvm.arch.mmu;
+ unsigned long nr_pages;
+ int ret;
+
+ nr_pages = kvm_pgtable_stage2_pgd_size(mmu->vtcr) >> PAGE_SHIFT;
+ ret = hyp_pool_init(&vm->pool, hyp_virt_to_pfn(pgd), nr_pages, 0);
+ if (ret)
+ return ret;
+
+ hyp_spin_lock_init(&vm->lock);
+ vm->mm_ops = (struct kvm_pgtable_mm_ops) {
+ .zalloc_pages_exact = guest_s2_zalloc_pages_exact,
+ .free_pages_exact = guest_s2_free_pages_exact,
+ .zalloc_page = guest_s2_zalloc_page,
+ .phys_to_virt = hyp_phys_to_virt,
+ .virt_to_phys = hyp_virt_to_phys,
+ .page_count = hyp_page_count,
+ .get_page = guest_s2_get_page,
+ .put_page = guest_s2_put_page,
+ .dcache_clean_inval_poc = clean_dcache_guest_page,
+ .icache_inval_pou = invalidate_icache_guest_page,
+ };
+
+ guest_lock_component(vm);
+ ret = __kvm_pgtable_stage2_init(mmu->pgt, mmu, &vm->mm_ops, 0, NULL);
+ guest_unlock_component(vm);
+ if (ret)
+ return ret;
+
+ vm->kvm.arch.mmu.pgd_phys = __hyp_pa(vm->pgt.pgd);
+
+ return 0;
+}
+
+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 */
+ guest_lock_component(vm);
+ kvm_pgtable_stage2_destroy(&vm->pgt);
+ vm->kvm.arch.mmu.pgd_phys = 0ULL;
+ guest_unlock_component(vm);
+
+ /* Drain the hyp_pool into the memcache */
+ addr = hyp_alloc_pages(&vm->pool, 0);
+ while (addr) {
+ 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);
+ }
+}
+
int __pkvm_prot_finalize(void)
{
- struct kvm_s2_mmu *mmu = &host_kvm.arch.mmu;
+ struct kvm_s2_mmu *mmu = &host_mmu.arch.mmu;
struct kvm_nvhe_init_params *params = this_cpu_ptr(&kvm_init_params);
+ if (params->hcr_el2 & HCR_VM)
+ return -EPERM;
+
params->vttbr = kvm_get_vttbr(mmu);
- params->vtcr = host_kvm.arch.vtcr;
+ params->vtcr = mmu->vtcr;
params->hcr_el2 |= HCR_VM;
+
+ /*
+ * The CMO below not only cleans the updated params to the
+ * PoC, but also provides the DSB that ensures ongoing
+ * page-table walks that have started before we trapped to EL2
+ * have completed.
+ */
kvm_flush_dcache_to_poc(params, sizeof(*params));
- write_sysreg(params->hcr_el2, hcr_el2);
- __load_stage2(&host_kvm.arch.mmu, host_kvm.arch.vtcr);
+ write_sysreg_hcr(params->hcr_el2);
+ __load_stage2(&host_mmu.arch.mmu, &host_mmu.arch);
/*
* Make sure to have an ISB before the TLB maintenance below but only
@@ -144,7 +352,7 @@ int __pkvm_prot_finalize(void)
static int host_stage2_unmap_dev_all(void)
{
- struct kvm_pgtable *pgt = &host_kvm.pgt;
+ struct kvm_pgtable *pgt = &host_mmu.pgt;
struct memblock_region *reg;
u64 addr = 0;
int i, ret;
@@ -159,7 +367,25 @@ static int host_stage2_unmap_dev_all(void)
return kvm_pgtable_stage2_unmap(pgt, addr, BIT(pgt->ia_bits) - addr);
}
-static bool find_mem_range(phys_addr_t addr, struct kvm_mem_range *range)
+/*
+ * Ensure the PFN range is contained within PA-range.
+ *
+ * This check is also robust to overflows and is therefore a requirement before
+ * using a pfn/nr_pages pair from an untrusted source.
+ */
+static bool pfn_range_is_valid(u64 pfn, u64 nr_pages)
+{
+ u64 limit = BIT(kvm_phys_shift(&host_mmu.arch.mmu) - PAGE_SHIFT);
+
+ return pfn < limit && ((limit - pfn) >= nr_pages);
+}
+
+struct kvm_mem_range {
+ u64 start;
+ u64 end;
+};
+
+static struct memblock_region *find_mem_range(phys_addr_t addr, struct kvm_mem_range *range)
{
int cur, left = 0, right = hyp_memblock_nr;
struct memblock_region *reg;
@@ -182,98 +408,989 @@ static bool find_mem_range(phys_addr_t addr, struct kvm_mem_range *range)
} else {
range->start = reg->base;
range->end = end;
- return true;
+ return reg;
}
}
- return false;
+ return NULL;
+}
+
+bool addr_is_memory(phys_addr_t phys)
+{
+ struct kvm_mem_range range;
+
+ return !!find_mem_range(phys, &range);
+}
+
+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;
+
+ /*
+ * 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;
+
+ if (!reg || reg->flags & MEMBLOCK_NOMAP)
+ return -EPERM;
+
+ return 0;
}
static bool range_is_memory(u64 start, u64 end)
{
- struct kvm_mem_range r1, r2;
+ struct kvm_mem_range r;
- if (!find_mem_range(start, &r1) || !find_mem_range(end, &r2))
- return false;
- if (r1.start != r2.start)
+ if (!find_mem_range(start, &r))
return false;
- return true;
+ return is_in_mem_range(end - 1, &r);
}
static inline int __host_stage2_idmap(u64 start, u64 end,
enum kvm_pgtable_prot prot)
{
- return kvm_pgtable_stage2_map(&host_kvm.pgt, start, end - start, start,
- prot, &host_s2_pool);
+ return kvm_pgtable_stage2_map(&host_mmu.pgt, start, end - start, start,
+ prot, &host_s2_pool, 0);
+}
+
+/*
+ * The pool has been provided with enough pages to cover all of memory with
+ * page granularity, but it is difficult to know how much of the MMIO range
+ * we will need to cover upfront, so we may need to 'recycle' the pages if we
+ * run out.
+ */
+#define host_stage2_try(fn, ...) \
+ ({ \
+ int __ret; \
+ hyp_assert_lock_held(&host_mmu.lock); \
+ __ret = fn(__VA_ARGS__); \
+ if (__ret == -ENOMEM) { \
+ __ret = host_stage2_unmap_dev_all(); \
+ if (!__ret) \
+ __ret = fn(__VA_ARGS__); \
+ } \
+ __ret; \
+ })
+
+static inline bool range_included(struct kvm_mem_range *child,
+ struct kvm_mem_range *parent)
+{
+ return parent->start <= child->start && child->end <= parent->end;
+}
+
+static int host_stage2_adjust_range(u64 addr, struct kvm_mem_range *range)
+{
+ struct kvm_mem_range cur;
+ kvm_pte_t pte;
+ u64 granule;
+ s8 level;
+ int ret;
+
+ hyp_assert_lock_held(&host_mmu.lock);
+ ret = kvm_pgtable_get_leaf(&host_mmu.pgt, addr, &pte, &level);
+ if (ret)
+ return ret;
+
+ if (kvm_pte_valid(pte))
+ return -EAGAIN;
+
+ if (pte) {
+ WARN_ON(addr_is_memory(addr) &&
+ get_host_state(hyp_phys_to_page(addr)) != PKVM_NOPAGE);
+ return -EPERM;
+ }
+
+ for (; level <= KVM_PGTABLE_LAST_LEVEL; level++) {
+ if (!kvm_level_supports_block_mapping(level))
+ continue;
+ granule = kvm_granule_size(level);
+ cur.start = ALIGN_DOWN(addr, granule);
+ cur.end = cur.start + granule;
+ if (!range_included(&cur, range))
+ continue;
+ *range = cur;
+ return 0;
+ }
+
+ WARN_ON(1);
+
+ return -EINVAL;
+}
+
+int host_stage2_idmap_locked(phys_addr_t addr, u64 size,
+ enum kvm_pgtable_prot prot)
+{
+ 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)
+{
+ 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)
+{
+ /*
+ * Block mappings must be used with care in the host stage-2 as a
+ * kvm_pgtable_stage2_map() operation targeting a page in the range of
+ * an existing block will delete the block under the assumption that
+ * mappings in the rest of the block range can always be rebuilt lazily.
+ * That assumption is correct for the host stage-2 with RWX mappings
+ * targeting memory or RW mappings targeting MMIO ranges (see
+ * host_stage2_idmap() below which implements some of the host memory
+ * abort logic). However, this is not safe for any other mappings where
+ * the host stage-2 page-table is in fact the only place where this
+ * state is stored. In all those cases, it is safer to use page-level
+ * mappings, hence avoiding to lose the state because of side-effects in
+ * kvm_pgtable_stage2_map().
+ */
+ if (range_is_memory(addr, end))
+ return prot != PKVM_HOST_MEM_PROT;
+ else
+ return prot != PKVM_HOST_MMIO_PROT;
}
static int host_stage2_idmap(u64 addr)
{
- enum kvm_pgtable_prot prot = KVM_PGTABLE_PROT_R | KVM_PGTABLE_PROT_W;
struct kvm_mem_range range;
- bool is_memory = find_mem_range(addr, &range);
+ bool is_memory = !!find_mem_range(addr, &range);
+ enum kvm_pgtable_prot prot;
int ret;
- if (is_memory)
- prot |= KVM_PGTABLE_PROT_X;
+ prot = is_memory ? PKVM_HOST_MEM_PROT : PKVM_HOST_MMIO_PROT;
- hyp_spin_lock(&host_kvm.lock);
- ret = kvm_pgtable_stage2_find_range(&host_kvm.pgt, addr, prot, &range);
+ host_lock_component();
+ ret = host_stage2_adjust_range(addr, &range);
if (ret)
goto unlock;
- ret = __host_stage2_idmap(range.start, range.end, prot);
- if (ret != -ENOMEM)
- goto unlock;
+ ret = host_stage2_idmap_locked(range.start, range.end - range.start, prot);
+unlock:
+ host_unlock_component();
+
+ return ret;
+}
+
+void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt)
+{
+ struct kvm_vcpu_fault_info fault;
+ u64 esr, addr;
+ int ret = 0;
+
+ esr = read_sysreg_el2(SYS_ESR);
+ if (!__get_fault_info(esr, &fault)) {
+ /*
+ * We've presumably raced with a page-table change which caused
+ * AT to fail, try again.
+ */
+ return;
+ }
+
/*
- * The pool has been provided with enough pages to cover all of memory
- * with page granularity, but it is difficult to know how much of the
- * MMIO range we will need to cover upfront, so we may need to 'recycle'
- * the pages if we run out.
+ * Yikes, we couldn't resolve the fault IPA. This should reinject an
+ * abort into the host when we figure out how to do that.
*/
- ret = host_stage2_unmap_dev_all();
+ BUG_ON(!(fault.hpfar_el2 & HPFAR_EL2_NS));
+ addr = FIELD_GET(HPFAR_EL2_FIPA, fault.hpfar_el2) << 12;
+
+ ret = host_stage2_idmap(addr);
+ BUG_ON(ret && ret != -EAGAIN);
+}
+
+struct check_walk_data {
+ enum pkvm_page_state desired;
+ enum pkvm_page_state (*get_page_state)(kvm_pte_t pte, u64 addr);
+};
+
+static int __check_page_state_visitor(const struct kvm_pgtable_visit_ctx *ctx,
+ enum kvm_pgtable_walk_flags visit)
+{
+ struct check_walk_data *d = ctx->arg;
+
+ return d->get_page_state(ctx->old, ctx->addr) == d->desired ? 0 : -EPERM;
+}
+
+static int check_page_state_range(struct kvm_pgtable *pgt, u64 addr, u64 size,
+ struct check_walk_data *data)
+{
+ struct kvm_pgtable_walker walker = {
+ .cb = __check_page_state_visitor,
+ .arg = data,
+ .flags = KVM_PGTABLE_WALK_LEAF,
+ };
+
+ return kvm_pgtable_walk(pgt, addr, size, &walker);
+}
+
+static int __host_check_page_state_range(u64 addr, u64 size,
+ enum pkvm_page_state state)
+{
+ int ret;
+
+ ret = check_range_allowed_memory(addr, addr + size);
+ if (ret)
+ return ret;
+
+ hyp_assert_lock_held(&host_mmu.lock);
+
+ for_each_hyp_page(page, addr, size) {
+ if (get_host_state(page) != state)
+ return -EPERM;
+ }
+
+ return 0;
+}
+
+static int __host_set_page_state_range(u64 addr, u64 size,
+ enum pkvm_page_state state)
+{
+ if (get_host_state(hyp_phys_to_page(addr)) == PKVM_NOPAGE) {
+ int ret = host_stage2_idmap_locked(addr, size, PKVM_HOST_MEM_PROT);
+
+ if (ret)
+ return ret;
+ }
+
+ __host_update_page_state(addr, size, state);
+
+ return 0;
+}
+
+static void __hyp_set_page_state_range(phys_addr_t phys, u64 size, enum pkvm_page_state state)
+{
+ for_each_hyp_page(page, phys, size)
+ set_hyp_state(page, state);
+}
+
+static int __hyp_check_page_state_range(phys_addr_t phys, u64 size, enum pkvm_page_state state)
+{
+ for_each_hyp_page(page, phys, size) {
+ if (get_hyp_state(page) != state)
+ return -EPERM;
+ }
+
+ return 0;
+}
+
+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_stage2_pte_prot(pte));
+}
+
+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 = guest_get_page_state,
+ };
+
+ hyp_assert_lock_held(&vm->lock);
+ return check_page_state_range(&vm->pgt, addr, size, &d);
+}
+
+int __pkvm_host_share_hyp(u64 pfn)
+{
+ u64 phys = hyp_pfn_to_phys(pfn);
+ u64 size = PAGE_SIZE;
+ int ret;
+
+ host_lock_component();
+ hyp_lock_component();
+
+ 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;
- ret = __host_stage2_idmap(range.start, range.end, prot);
+ __hyp_set_page_state_range(phys, size, PKVM_PAGE_SHARED_BORROWED);
+ WARN_ON(__host_set_page_state_range(phys, size, PKVM_PAGE_SHARED_OWNED));
unlock:
- hyp_spin_unlock(&host_kvm.lock);
+ hyp_unlock_component();
+ host_unlock_component();
return ret;
}
-int __pkvm_mark_hyp(phys_addr_t start, phys_addr_t end)
+int __pkvm_host_unshare_hyp(u64 pfn)
{
+ u64 phys = hyp_pfn_to_phys(pfn);
+ u64 virt = (u64)__hyp_va(phys);
+ u64 size = PAGE_SIZE;
int ret;
- /*
- * host_stage2_unmap_dev_all() currently relies on MMIO mappings being
- * non-persistent, so don't allow changing page ownership in MMIO range.
- */
- if (!range_is_memory(start, end))
+ host_lock_component();
+ hyp_lock_component();
+
+ 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;
+ }
+
+ __hyp_set_page_state_range(phys, size, PKVM_NOPAGE);
+ WARN_ON(__host_set_page_state_range(phys, size, PKVM_PAGE_OWNED));
+
+unlock:
+ hyp_unlock_component();
+ host_unlock_component();
+
+ return ret;
+}
+
+int __pkvm_host_donate_hyp(u64 pfn, u64 nr_pages)
+{
+ u64 phys = hyp_pfn_to_phys(pfn);
+ u64 size = PAGE_SIZE * nr_pages;
+ void *virt = __hyp_va(phys);
+ int ret;
+
+ if (!pfn_range_is_valid(pfn, nr_pages))
return -EINVAL;
- hyp_spin_lock(&host_kvm.lock);
- ret = kvm_pgtable_stage2_set_owner(&host_kvm.pgt, start, end - start,
- &host_s2_pool, pkvm_hyp_id);
- hyp_spin_unlock(&host_kvm.lock);
+ host_lock_component();
+ hyp_lock_component();
+
+ 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;
+
+ __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));
- return ret != -EAGAIN ? ret : 0;
+unlock:
+ hyp_unlock_component();
+ host_unlock_component();
+
+ return ret;
}
-void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt)
+int __pkvm_hyp_donate_host(u64 pfn, u64 nr_pages)
{
- struct kvm_vcpu_fault_info fault;
- u64 esr, addr;
- int ret = 0;
+ u64 phys = hyp_pfn_to_phys(pfn);
+ u64 size = PAGE_SIZE * nr_pages;
+ u64 virt = (u64)__hyp_va(phys);
+ int ret;
- esr = read_sysreg_el2(SYS_ESR);
- BUG_ON(!__get_fault_info(esr, &fault));
+ if (!pfn_range_is_valid(pfn, nr_pages))
+ return -EINVAL;
- addr = (fault.hpfar_el2 & HPFAR_MASK) << 8;
- ret = host_stage2_idmap(addr);
- BUG_ON(ret && ret != -EAGAIN);
+ host_lock_component();
+ hyp_lock_component();
+
+ ret = __hyp_check_page_state_range(phys, size, PKVM_PAGE_OWNED);
+ if (ret)
+ goto unlock;
+ ret = __host_check_page_state_range(phys, size, PKVM_NOPAGE);
+ if (ret)
+ goto unlock;
+
+ __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;
+}
+
+int hyp_pin_shared_mem(void *from, void *to)
+{
+ 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;
+
+ host_lock_component();
+ hyp_lock_component();
+
+ 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;
+
+ 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;
+}
+
+void hyp_unpin_shared_mem(void *from, void *to)
+{
+ u64 cur, start = ALIGN_DOWN((u64)from, PAGE_SIZE);
+ u64 end = PAGE_ALIGN((u64)to);
+ struct hyp_page *p;
+
+ 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);
+ }
+
+ hyp_unlock_component();
+ host_unlock_component();
+}
+
+int __pkvm_host_share_ffa(u64 pfn, u64 nr_pages)
+{
+ u64 phys = hyp_pfn_to_phys(pfn);
+ u64 size = PAGE_SIZE * nr_pages;
+ int ret;
+
+ if (!pfn_range_is_valid(pfn, nr_pages))
+ return -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();
+
+ return ret;
+}
+
+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;
+
+ if (!pfn_range_is_valid(pfn, nr_pages))
+ return -EINVAL;
+
+ 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 __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;
+ }
+
+ /* 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,
+ 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;
+
+ if (prot & ~KVM_PGTABLE_PROT_RWX)
+ return -EINVAL;
+
+ if (!pfn_range_is_valid(pfn, nr_pages))
+ return -EINVAL;
+
+ ret = __guest_check_transition_size(phys, ipa, nr_pages, &size);
+ if (ret)
+ return ret;
+
+ ret = check_range_allowed_memory(phys, phys + size);
+ if (ret)
+ return ret;
+
+ host_lock_component();
+ guest_lock_component(vm);
+
+ ret = __guest_check_page_state_range(vm, ipa, size, PKVM_NOPAGE);
+ if (ret)
+ goto unlock;
+
+ 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 __check_host_shared_guest(struct pkvm_hyp_vm *vm, u64 *__phys, u64 ipa, u64 size)
+{
+ enum pkvm_page_state state;
+ kvm_pte_t pte;
+ u64 phys;
+ s8 level;
+ int ret;
+
+ ret = kvm_pgtable_get_leaf(&vm->pgt, ipa, &pte, &level);
+ if (ret)
+ return ret;
+ if (!kvm_pte_valid(pte))
+ return -ENOENT;
+ if (size && kvm_granule_size(level) != size)
+ return -E2BIG;
+
+ if (!size)
+ size = kvm_granule_size(level);
+
+ 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;
+
+ 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;
+ }
+
+ *__phys = phys;
+
+ return 0;
+}
+
+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 = __guest_check_transition_size(0, ipa, nr_pages, &size);
+ if (ret)
+ return ret;
+
+ host_lock_component();
+ guest_lock_component(vm);
+
+ ret = __check_host_shared_guest(vm, &phys, ipa, size);
+ if (ret)
+ goto unlock;
+
+ ret = kvm_pgtable_stage2_unmap(&vm->pgt, ipa, size);
+ if (ret)
+ goto unlock;
+
+ 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);
+ }
+
+unlock:
+ guest_unlock_component(vm);
+ host_unlock_component();
+
+ return ret;
+}
+
+static void assert_host_shared_guest(struct pkvm_hyp_vm *vm, u64 ipa, u64 size)
+{
+ u64 phys;
+ int ret;
+
+ if (!IS_ENABLED(CONFIG_NVHE_EL2_DEBUG))
+ return;
+
+ host_lock_component();
+ guest_lock_component(vm);
+
+ ret = __check_host_shared_guest(vm, &phys, ipa, size);
+
+ guest_unlock_component(vm);
+ host_unlock_component();
+
+ WARN_ON(ret && ret != -ENOENT);
+}
+
+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;
+
+ if (pkvm_hyp_vm_is_protected(vm))
+ return -EPERM;
+
+ if (prot & ~KVM_PGTABLE_PROT_RWX)
+ return -EINVAL;
+
+ assert_host_shared_guest(vm, ipa, 0);
+ guest_lock_component(vm);
+ ret = kvm_pgtable_stage2_relax_perms(&vm->pgt, ipa, prot, 0);
+ guest_unlock_component(vm);
+
+ return ret;
+}
+
+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;
+
+ if (pkvm_hyp_vm_is_protected(vm))
+ return -EPERM;
+
+ ret = __guest_check_transition_size(0, ipa, nr_pages, &size);
+ if (ret)
+ return ret;
+
+ 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 __pkvm_host_test_clear_young_guest(u64 gfn, u64 nr_pages, bool mkold, struct pkvm_hyp_vm *vm)
+{
+ u64 size, ipa = hyp_pfn_to_phys(gfn);
+ int ret;
+
+ if (pkvm_hyp_vm_is_protected(vm))
+ return -EPERM;
+
+ ret = __guest_check_transition_size(0, ipa, nr_pages, &size);
+ if (ret)
+ return ret;
+
+ 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;
+}
+
+int __pkvm_host_mkyoung_guest(u64 gfn, struct pkvm_hyp_vcpu *vcpu)
+{
+ struct pkvm_hyp_vm *vm = pkvm_hyp_vcpu_to_hyp_vm(vcpu);
+ u64 ipa = hyp_pfn_to_phys(gfn);
+
+ if (pkvm_hyp_vm_is_protected(vm))
+ return -EPERM;
+
+ assert_host_shared_guest(vm, ipa, 0);
+ guest_lock_component(vm);
+ kvm_pgtable_stage2_mkyoung(&vm->pgt, ipa, 0);
+ guest_unlock_component(vm);
+
+ return 0;
+}
+
+#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,
+ },
+ },
+ },
+};
+
+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 u64 selftest_ipa(void)
+{
+ 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();
+ WARN_ON(__host_check_page_state_range(phys, size, selftest_state.host));
+ host_unlock_component();
+
+ 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
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