[PATCH v3 09/13] KVM: arm64: Convert translation level parameter to s8
Ryan Roberts
ryan.roberts at arm.com
Sun Sep 17 23:57:36 PDT 2023
With the introduction of FEAT_LPA2, the Arm ARM adds a new level of
translation, level -1, so levels can now be in the range [-1;3]. 3 is
always the last level and the first level is determined based on the
number of VA bits in use.
Convert level variables to use a signed type in preparation for
supporting this new level -1.
Since the last level is always anchored at 3, and the first level varies
to suit the number of VA/IPA bits, take the opportunity to replace
KVM_PGTABLE_MAX_LEVELS with the 2 macros KVM_PGTABLE_FIRST_LEVEL and
KVM_PGTABLE_LAST_LEVEL. This removes the assumption from the code that
levels run from 0 to KVM_PGTABLE_MAX_LEVELS - 1, which will soon no
longer be true.
No behavioral changes intended.
Signed-off-by: Ryan Roberts <ryan.roberts at arm.com>
---
arch/arm64/include/asm/kvm_emulate.h | 2 +-
arch/arm64/include/asm/kvm_pgtable.h | 31 ++++++-------
arch/arm64/include/asm/kvm_pkvm.h | 5 ++-
arch/arm64/kvm/hyp/nvhe/mem_protect.c | 6 +--
arch/arm64/kvm/hyp/nvhe/mm.c | 4 +-
arch/arm64/kvm/hyp/nvhe/setup.c | 2 +-
arch/arm64/kvm/hyp/pgtable.c | 64 ++++++++++++++-------------
arch/arm64/kvm/mmu.c | 16 ++++---
8 files changed, 69 insertions(+), 61 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 3d6725ff0bf6..bf3ef66eb51f 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -404,7 +404,7 @@ static __always_inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vc
return kvm_vcpu_get_esr(vcpu) & ESR_ELx_FSC_TYPE;
}
-static __always_inline u8 kvm_vcpu_trap_get_fault_level(const struct kvm_vcpu *vcpu)
+static __always_inline s8 kvm_vcpu_trap_get_fault_level(const struct kvm_vcpu *vcpu)
{
return kvm_vcpu_get_esr(vcpu) & ESR_ELx_FSC_LEVEL;
}
diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
index b240158e1218..c61bb9709201 100644
--- a/arch/arm64/include/asm/kvm_pgtable.h
+++ b/arch/arm64/include/asm/kvm_pgtable.h
@@ -11,7 +11,8 @@
#include <linux/kvm_host.h>
#include <linux/types.h>
-#define KVM_PGTABLE_MAX_LEVELS 4U
+#define KVM_PGTABLE_FIRST_LEVEL 0
+#define KVM_PGTABLE_LAST_LEVEL 3
/*
* The largest supported block sizes for KVM (no 52-bit PA support):
@@ -20,9 +21,9 @@
* - 64K (level 2): 512MB
*/
#ifdef CONFIG_ARM64_4K_PAGES
-#define KVM_PGTABLE_MIN_BLOCK_LEVEL 1U
+#define KVM_PGTABLE_MIN_BLOCK_LEVEL 1
#else
-#define KVM_PGTABLE_MIN_BLOCK_LEVEL 2U
+#define KVM_PGTABLE_MIN_BLOCK_LEVEL 2
#endif
static inline u64 kvm_get_parange_max(void)
@@ -101,28 +102,28 @@ static inline kvm_pfn_t kvm_pte_to_pfn(kvm_pte_t pte)
return __phys_to_pfn(kvm_pte_to_phys(pte));
}
-static inline u64 kvm_granule_shift(u32 level)
+static inline u64 kvm_granule_shift(s8 level)
{
- /* Assumes KVM_PGTABLE_MAX_LEVELS is 4 */
+ /* Assumes KVM_PGTABLE_LAST_LEVEL is 3 */
return ARM64_HW_PGTABLE_LEVEL_SHIFT(level);
}
-static inline u64 kvm_granule_size(u32 level)
+static inline u64 kvm_granule_size(s8 level)
{
return BIT(kvm_granule_shift(level));
}
-static inline bool kvm_level_supports_block_mapping(u32 level)
+static inline bool kvm_level_supports_block_mapping(s8 level)
{
return level >= KVM_PGTABLE_MIN_BLOCK_LEVEL;
}
static inline u32 kvm_supported_block_sizes(void)
{
- u32 level = KVM_PGTABLE_MIN_BLOCK_LEVEL;
+ s8 level = KVM_PGTABLE_MIN_BLOCK_LEVEL;
u32 r = 0;
- for (; level < KVM_PGTABLE_MAX_LEVELS; level++)
+ for (; level <= KVM_PGTABLE_LAST_LEVEL; level++)
r |= BIT(kvm_granule_shift(level));
return r;
@@ -167,7 +168,7 @@ struct kvm_pgtable_mm_ops {
void* (*zalloc_page)(void *arg);
void* (*zalloc_pages_exact)(size_t size);
void (*free_pages_exact)(void *addr, size_t size);
- void (*free_unlinked_table)(void *addr, u32 level);
+ void (*free_unlinked_table)(void *addr, s8 level);
void (*get_page)(void *addr);
void (*put_page)(void *addr);
int (*page_count)(void *addr);
@@ -263,7 +264,7 @@ struct kvm_pgtable_visit_ctx {
u64 start;
u64 addr;
u64 end;
- u32 level;
+ s8 level;
enum kvm_pgtable_walk_flags flags;
};
@@ -366,7 +367,7 @@ static inline bool kvm_pgtable_walk_lock_held(void)
*/
struct kvm_pgtable {
u32 ia_bits;
- u32 start_level;
+ s8 start_level;
kvm_pteref_t pgd;
struct kvm_pgtable_mm_ops *mm_ops;
@@ -500,7 +501,7 @@ void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt);
* The page-table is assumed to be unreachable by any hardware walkers prior to
* freeing and therefore no TLB invalidation is performed.
*/
-void kvm_pgtable_stage2_free_unlinked(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, u32 level);
+void kvm_pgtable_stage2_free_unlinked(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, s8 level);
/**
* kvm_pgtable_stage2_create_unlinked() - Create an unlinked stage-2 paging structure.
@@ -524,7 +525,7 @@ void kvm_pgtable_stage2_free_unlinked(struct kvm_pgtable_mm_ops *mm_ops, void *p
* an ERR_PTR(error) on failure.
*/
kvm_pte_t *kvm_pgtable_stage2_create_unlinked(struct kvm_pgtable *pgt,
- u64 phys, u32 level,
+ u64 phys, s8 level,
enum kvm_pgtable_prot prot,
void *mc, bool force_pte);
@@ -750,7 +751,7 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size,
* Return: 0 on success, negative error code on failure.
*/
int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr,
- kvm_pte_t *ptep, u32 *level);
+ kvm_pte_t *ptep, s8 *level);
/**
* kvm_pgtable_stage2_pte_prot() - Retrieve the protection attributes of a
diff --git a/arch/arm64/include/asm/kvm_pkvm.h b/arch/arm64/include/asm/kvm_pkvm.h
index e46250a02017..ad9cfb5c1ff4 100644
--- a/arch/arm64/include/asm/kvm_pkvm.h
+++ b/arch/arm64/include/asm/kvm_pkvm.h
@@ -56,10 +56,11 @@ static inline unsigned long hyp_vm_table_pages(void)
static inline unsigned long __hyp_pgtable_max_pages(unsigned long nr_pages)
{
- unsigned long total = 0, i;
+ unsigned long total = 0;
+ int i;
/* Provision the worst case scenario */
- for (i = 0; i < KVM_PGTABLE_MAX_LEVELS; i++) {
+ for (i = KVM_PGTABLE_FIRST_LEVEL; i <= KVM_PGTABLE_LAST_LEVEL; i++) {
nr_pages = DIV_ROUND_UP(nr_pages, PTRS_PER_PTE);
total += nr_pages;
}
diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
index 9d703441278b..2cfb6352a8ea 100644
--- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c
+++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
@@ -91,7 +91,7 @@ static void host_s2_put_page(void *addr)
hyp_put_page(&host_s2_pool, addr);
}
-static void host_s2_free_unlinked_table(void *addr, u32 level)
+static void host_s2_free_unlinked_table(void *addr, s8 level)
{
kvm_pgtable_stage2_free_unlinked(&host_mmu.mm_ops, addr, level);
}
@@ -443,7 +443,7 @@ static int host_stage2_adjust_range(u64 addr, struct kvm_mem_range *range)
{
struct kvm_mem_range cur;
kvm_pte_t pte;
- u32 level;
+ s8 level;
int ret;
hyp_assert_lock_held(&host_mmu.lock);
@@ -462,7 +462,7 @@ static int host_stage2_adjust_range(u64 addr, struct kvm_mem_range *range)
cur.start = ALIGN_DOWN(addr, granule);
cur.end = cur.start + granule;
level++;
- } while ((level < KVM_PGTABLE_MAX_LEVELS) &&
+ } while ((level <= KVM_PGTABLE_LAST_LEVEL) &&
!(kvm_level_supports_block_mapping(level) &&
range_included(&cur, range)));
diff --git a/arch/arm64/kvm/hyp/nvhe/mm.c b/arch/arm64/kvm/hyp/nvhe/mm.c
index 65a7a186d7b2..b01a3d1078a8 100644
--- a/arch/arm64/kvm/hyp/nvhe/mm.c
+++ b/arch/arm64/kvm/hyp/nvhe/mm.c
@@ -260,7 +260,7 @@ static void fixmap_clear_slot(struct hyp_fixmap_slot *slot)
* https://lore.kernel.org/kvm/20221017115209.2099-1-will@kernel.org/T/#mf10dfbaf1eaef9274c581b81c53758918c1d0f03
*/
dsb(ishst);
- __tlbi_level(vale2is, __TLBI_VADDR(addr, 0), (KVM_PGTABLE_MAX_LEVELS - 1));
+ __tlbi_level(vale2is, __TLBI_VADDR(addr, 0), KVM_PGTABLE_LAST_LEVEL);
dsb(ish);
isb();
}
@@ -275,7 +275,7 @@ static int __create_fixmap_slot_cb(const struct kvm_pgtable_visit_ctx *ctx,
{
struct hyp_fixmap_slot *slot = per_cpu_ptr(&fixmap_slots, (u64)ctx->arg);
- if (!kvm_pte_valid(ctx->old) || ctx->level != KVM_PGTABLE_MAX_LEVELS - 1)
+ if (!kvm_pte_valid(ctx->old) || ctx->level != KVM_PGTABLE_LAST_LEVEL)
return -EINVAL;
slot->addr = ctx->addr;
diff --git a/arch/arm64/kvm/hyp/nvhe/setup.c b/arch/arm64/kvm/hyp/nvhe/setup.c
index 0d5e0a89ddce..bc58d1b515af 100644
--- a/arch/arm64/kvm/hyp/nvhe/setup.c
+++ b/arch/arm64/kvm/hyp/nvhe/setup.c
@@ -181,7 +181,7 @@ static int fix_host_ownership_walker(const struct kvm_pgtable_visit_ctx *ctx,
if (!kvm_pte_valid(ctx->old))
return 0;
- if (ctx->level != (KVM_PGTABLE_MAX_LEVELS - 1))
+ if (ctx->level != KVM_PGTABLE_LAST_LEVEL)
return -EINVAL;
phys = kvm_pte_to_phys(ctx->old);
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index 062eb7bcdb8a..8e79ff6972ce 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -101,7 +101,7 @@ static bool kvm_block_mapping_supported(const struct kvm_pgtable_visit_ctx *ctx,
return IS_ALIGNED(ctx->addr, granule);
}
-static u32 kvm_pgtable_idx(struct kvm_pgtable_walk_data *data, u32 level)
+static u32 kvm_pgtable_idx(struct kvm_pgtable_walk_data *data, s8 level)
{
u64 shift = kvm_granule_shift(level);
u64 mask = BIT(PAGE_SHIFT - 3) - 1;
@@ -117,7 +117,7 @@ static u32 kvm_pgd_page_idx(struct kvm_pgtable *pgt, u64 addr)
return (addr & mask) >> shift;
}
-static u32 kvm_pgd_pages(u32 ia_bits, u32 start_level)
+static u32 kvm_pgd_pages(u32 ia_bits, s8 start_level)
{
struct kvm_pgtable pgt = {
.ia_bits = ia_bits,
@@ -127,9 +127,9 @@ static u32 kvm_pgd_pages(u32 ia_bits, u32 start_level)
return kvm_pgd_page_idx(&pgt, -1ULL) + 1;
}
-static bool kvm_pte_table(kvm_pte_t pte, u32 level)
+static bool kvm_pte_table(kvm_pte_t pte, s8 level)
{
- if (level == KVM_PGTABLE_MAX_LEVELS - 1)
+ if (level == KVM_PGTABLE_LAST_LEVEL)
return false;
if (!kvm_pte_valid(pte))
@@ -157,11 +157,11 @@ static kvm_pte_t kvm_init_table_pte(kvm_pte_t *childp, struct kvm_pgtable_mm_ops
return pte;
}
-static kvm_pte_t kvm_init_valid_leaf_pte(u64 pa, kvm_pte_t attr, u32 level)
+static kvm_pte_t kvm_init_valid_leaf_pte(u64 pa, kvm_pte_t attr, s8 level)
{
kvm_pte_t pte = kvm_phys_to_pte(pa);
- u64 type = (level == KVM_PGTABLE_MAX_LEVELS - 1) ? KVM_PTE_TYPE_PAGE :
- KVM_PTE_TYPE_BLOCK;
+ u64 type = (level == KVM_PGTABLE_LAST_LEVEL) ? KVM_PTE_TYPE_PAGE :
+ KVM_PTE_TYPE_BLOCK;
pte |= attr & (KVM_PTE_LEAF_ATTR_LO | KVM_PTE_LEAF_ATTR_HI);
pte |= FIELD_PREP(KVM_PTE_TYPE, type);
@@ -206,11 +206,11 @@ static bool kvm_pgtable_walk_continue(const struct kvm_pgtable_walker *walker,
}
static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data,
- struct kvm_pgtable_mm_ops *mm_ops, kvm_pteref_t pgtable, u32 level);
+ struct kvm_pgtable_mm_ops *mm_ops, kvm_pteref_t pgtable, s8 level);
static inline int __kvm_pgtable_visit(struct kvm_pgtable_walk_data *data,
struct kvm_pgtable_mm_ops *mm_ops,
- kvm_pteref_t pteref, u32 level)
+ kvm_pteref_t pteref, s8 level)
{
enum kvm_pgtable_walk_flags flags = data->walker->flags;
kvm_pte_t *ptep = kvm_dereference_pteref(data->walker, pteref);
@@ -275,12 +275,12 @@ static inline int __kvm_pgtable_visit(struct kvm_pgtable_walk_data *data,
}
static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data,
- struct kvm_pgtable_mm_ops *mm_ops, kvm_pteref_t pgtable, u32 level)
+ struct kvm_pgtable_mm_ops *mm_ops, kvm_pteref_t pgtable, s8 level)
{
u32 idx;
int ret = 0;
- if (WARN_ON_ONCE(level >= KVM_PGTABLE_MAX_LEVELS))
+ if (WARN_ON_ONCE(level > KVM_PGTABLE_LAST_LEVEL))
return -EINVAL;
for (idx = kvm_pgtable_idx(data, level); idx < PTRS_PER_PTE; ++idx) {
@@ -343,7 +343,7 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size,
struct leaf_walk_data {
kvm_pte_t pte;
- u32 level;
+ s8 level;
};
static int leaf_walker(const struct kvm_pgtable_visit_ctx *ctx,
@@ -358,7 +358,7 @@ static int leaf_walker(const struct kvm_pgtable_visit_ctx *ctx,
}
int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr,
- kvm_pte_t *ptep, u32 *level)
+ kvm_pte_t *ptep, s8 *level)
{
struct leaf_walk_data data;
struct kvm_pgtable_walker walker = {
@@ -471,7 +471,7 @@ static int hyp_map_walker(const struct kvm_pgtable_visit_ctx *ctx,
if (hyp_map_walker_try_leaf(ctx, data))
return 0;
- if (WARN_ON(ctx->level == KVM_PGTABLE_MAX_LEVELS - 1))
+ if (WARN_ON(ctx->level == KVM_PGTABLE_LAST_LEVEL))
return -EINVAL;
childp = (kvm_pte_t *)mm_ops->zalloc_page(NULL);
@@ -567,14 +567,18 @@ u64 kvm_pgtable_hyp_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size)
int kvm_pgtable_hyp_init(struct kvm_pgtable *pgt, u32 va_bits,
struct kvm_pgtable_mm_ops *mm_ops)
{
- u64 levels = ARM64_HW_PGTABLE_LEVELS(va_bits);
+ s8 start_level = KVM_PGTABLE_LAST_LEVEL + 1 -
+ ARM64_HW_PGTABLE_LEVELS(va_bits);
+ if (start_level < KVM_PGTABLE_FIRST_LEVEL ||
+ start_level > KVM_PGTABLE_LAST_LEVEL)
+ return -EINVAL;
pgt->pgd = (kvm_pteref_t)mm_ops->zalloc_page(NULL);
if (!pgt->pgd)
return -ENOMEM;
pgt->ia_bits = va_bits;
- pgt->start_level = KVM_PGTABLE_MAX_LEVELS - levels;
+ pgt->start_level = start_level;
pgt->mm_ops = mm_ops;
pgt->mmu = NULL;
pgt->force_pte_cb = NULL;
@@ -628,7 +632,7 @@ struct stage2_map_data {
u64 kvm_get_vtcr(u64 mmfr0, u64 mmfr1, u32 phys_shift)
{
u64 vtcr = VTCR_EL2_FLAGS;
- u8 lvls;
+ s8 lvls;
vtcr |= kvm_get_parange(mmfr0) << VTCR_EL2_PS_SHIFT;
vtcr |= VTCR_EL2_T0SZ(phys_shift);
@@ -911,7 +915,7 @@ static bool stage2_leaf_mapping_allowed(const struct kvm_pgtable_visit_ctx *ctx,
{
u64 phys = stage2_map_walker_phys_addr(ctx, data);
- if (data->force_pte && (ctx->level < (KVM_PGTABLE_MAX_LEVELS - 1)))
+ if (data->force_pte && ctx->level < KVM_PGTABLE_LAST_LEVEL)
return false;
return kvm_block_mapping_supported(ctx, phys);
@@ -990,7 +994,7 @@ static int stage2_map_walk_leaf(const struct kvm_pgtable_visit_ctx *ctx,
if (ret != -E2BIG)
return ret;
- if (WARN_ON(ctx->level == KVM_PGTABLE_MAX_LEVELS - 1))
+ if (WARN_ON(ctx->level == KVM_PGTABLE_LAST_LEVEL))
return -EINVAL;
if (!data->memcache)
@@ -1160,7 +1164,7 @@ struct stage2_attr_data {
kvm_pte_t attr_set;
kvm_pte_t attr_clr;
kvm_pte_t pte;
- u32 level;
+ s8 level;
};
static int stage2_attr_walker(const struct kvm_pgtable_visit_ctx *ctx,
@@ -1203,7 +1207,7 @@ static int stage2_attr_walker(const struct kvm_pgtable_visit_ctx *ctx,
static int stage2_update_leaf_attrs(struct kvm_pgtable *pgt, u64 addr,
u64 size, kvm_pte_t attr_set,
kvm_pte_t attr_clr, kvm_pte_t *orig_pte,
- u32 *level, enum kvm_pgtable_walk_flags flags)
+ s8 *level, enum kvm_pgtable_walk_flags flags)
{
int ret;
kvm_pte_t attr_mask = KVM_PTE_LEAF_ATTR_LO | KVM_PTE_LEAF_ATTR_HI;
@@ -1305,7 +1309,7 @@ int kvm_pgtable_stage2_relax_perms(struct kvm_pgtable *pgt, u64 addr,
enum kvm_pgtable_prot prot)
{
int ret;
- u32 level;
+ s8 level;
kvm_pte_t set = 0, clr = 0;
if (prot & KVM_PTE_LEAF_ATTR_HI_SW)
@@ -1358,7 +1362,7 @@ int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size)
}
kvm_pte_t *kvm_pgtable_stage2_create_unlinked(struct kvm_pgtable *pgt,
- u64 phys, u32 level,
+ u64 phys, s8 level,
enum kvm_pgtable_prot prot,
void *mc, bool force_pte)
{
@@ -1416,7 +1420,7 @@ kvm_pte_t *kvm_pgtable_stage2_create_unlinked(struct kvm_pgtable *pgt,
* fully populated tree up to the PTE entries. Note that @level is
* interpreted as in "level @level entry".
*/
-static int stage2_block_get_nr_page_tables(u32 level)
+static int stage2_block_get_nr_page_tables(s8 level)
{
switch (level) {
case 1:
@@ -1427,7 +1431,7 @@ static int stage2_block_get_nr_page_tables(u32 level)
return 0;
default:
WARN_ON_ONCE(level < KVM_PGTABLE_MIN_BLOCK_LEVEL ||
- level >= KVM_PGTABLE_MAX_LEVELS);
+ level > KVM_PGTABLE_LAST_LEVEL);
return -EINVAL;
};
}
@@ -1440,13 +1444,13 @@ static int stage2_split_walker(const struct kvm_pgtable_visit_ctx *ctx,
struct kvm_s2_mmu *mmu;
kvm_pte_t pte = ctx->old, new, *childp;
enum kvm_pgtable_prot prot;
- u32 level = ctx->level;
+ s8 level = ctx->level;
bool force_pte;
int nr_pages;
u64 phys;
/* No huge-pages exist at the last level */
- if (level == KVM_PGTABLE_MAX_LEVELS - 1)
+ if (level == KVM_PGTABLE_LAST_LEVEL)
return 0;
/* We only split valid block mappings */
@@ -1523,7 +1527,7 @@ int __kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_s2_mmu *mmu,
u64 vtcr = mmu->arch->vtcr;
u32 ia_bits = VTCR_EL2_IPA(vtcr);
u32 sl0 = FIELD_GET(VTCR_EL2_SL0_MASK, vtcr);
- u32 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0;
+ s8 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0;
pgd_sz = kvm_pgd_pages(ia_bits, start_level) * PAGE_SIZE;
pgt->pgd = (kvm_pteref_t)mm_ops->zalloc_pages_exact(pgd_sz);
@@ -1546,7 +1550,7 @@ size_t kvm_pgtable_stage2_pgd_size(u64 vtcr)
{
u32 ia_bits = VTCR_EL2_IPA(vtcr);
u32 sl0 = FIELD_GET(VTCR_EL2_SL0_MASK, vtcr);
- u32 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0;
+ s8 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0;
return kvm_pgd_pages(ia_bits, start_level) * PAGE_SIZE;
}
@@ -1582,7 +1586,7 @@ void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt)
pgt->pgd = NULL;
}
-void kvm_pgtable_stage2_free_unlinked(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, u32 level)
+void kvm_pgtable_stage2_free_unlinked(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, s8 level)
{
kvm_pteref_t ptep = (kvm_pteref_t)pgtable;
struct kvm_pgtable_walker walker = {
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 587a104f66c3..970799f9fb2e 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -223,12 +223,12 @@ static void stage2_free_unlinked_table_rcu_cb(struct rcu_head *head)
{
struct page *page = container_of(head, struct page, rcu_head);
void *pgtable = page_to_virt(page);
- u32 level = page_private(page);
+ s8 level = page_private(page);
kvm_pgtable_stage2_free_unlinked(&kvm_s2_mm_ops, pgtable, level);
}
-static void stage2_free_unlinked_table(void *addr, u32 level)
+static void stage2_free_unlinked_table(void *addr, s8 level)
{
struct page *page = virt_to_page(addr);
@@ -801,13 +801,13 @@ static int get_user_mapping_size(struct kvm *kvm, u64 addr)
struct kvm_pgtable pgt = {
.pgd = (kvm_pteref_t)kvm->mm->pgd,
.ia_bits = vabits_actual,
- .start_level = (KVM_PGTABLE_MAX_LEVELS -
- CONFIG_PGTABLE_LEVELS),
+ .start_level = (KVM_PGTABLE_LAST_LEVEL -
+ CONFIG_PGTABLE_LEVELS + 1),
.mm_ops = &kvm_user_mm_ops,
};
unsigned long flags;
kvm_pte_t pte = 0; /* Keep GCC quiet... */
- u32 level = ~0;
+ s8 level = ~0;
int ret;
/*
@@ -826,7 +826,9 @@ static int get_user_mapping_size(struct kvm *kvm, u64 addr)
* Not seeing an error, but not updating level? Something went
* deeply wrong...
*/
- if (WARN_ON(level >= KVM_PGTABLE_MAX_LEVELS))
+ if (WARN_ON(level > KVM_PGTABLE_LAST_LEVEL))
+ return -EFAULT;
+ if (WARN_ON(level < KVM_PGTABLE_FIRST_LEVEL))
return -EFAULT;
/* Oops, the userspace PTs are gone... Replay the fault */
@@ -1404,7 +1406,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
gfn_t gfn;
kvm_pfn_t pfn;
bool logging_active = memslot_is_logging(memslot);
- unsigned long fault_level = kvm_vcpu_trap_get_fault_level(vcpu);
+ s8 fault_level = kvm_vcpu_trap_get_fault_level(vcpu);
long vma_pagesize, fault_granule;
enum kvm_pgtable_prot prot = KVM_PGTABLE_PROT_R;
struct kvm_pgtable *pgt;
--
2.25.1
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