[PATCH v3 03/15] KVM: arm64: Pass mm_ops through the visitor context

Oliver Upton
2022-10-27T22:18:51Z

As a prerequisite for getting visitors off of struct kvm_pgtable, pass
mm_ops through the visitor context.

No functional change intended.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
arch/arm64/include/asm/kvm_pgtable.h | 1 +
arch/arm64/kvm/hyp/nvhe/setup.c | 3 +-
arch/arm64/kvm/hyp/pgtable.c | 63 +++++++++++-----------------
3 files changed, 26 insertions(+), 41 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
index 14d4b68a1e92..a752793482cb 100644
--- a/arch/arm64/include/asm/kvm_pgtable.h
+++ b/arch/arm64/include/asm/kvm_pgtable.h
@@ -203,6 +203,7 @@ struct kvm_pgtable_visit_ctx {
kvm_pte_t *ptep;
kvm_pte_t old;
void *arg;
+ struct kvm_pgtable_mm_ops *mm_ops;
u64 addr;
u64 end;
u32 level;
diff --git a/arch/arm64/kvm/hyp/nvhe/setup.c b/arch/arm64/kvm/hyp/nvhe/setup.c
index 6af443c9d78e..1068338d77f3 100644
--- a/arch/arm64/kvm/hyp/nvhe/setup.c
+++ b/arch/arm64/kvm/hyp/nvhe/setup.c
@@ -189,7 +189,7 @@ static void hpool_put_page(void *addr)
static int finalize_host_mappings_walker(const struct kvm_pgtable_visit_ctx *ctx,
enum kvm_pgtable_walk_flags visit)
{
- struct kvm_pgtable_mm_ops *mm_ops = ctx->arg;
+ struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops;
enum kvm_pgtable_prot prot;
enum pkvm_page_state state;
phys_addr_t phys;
@@ -239,7 +239,6 @@ static int finalize_host_mappings(void)
struct kvm_pgtable_walker walker = {
.cb = finalize_host_mappings_walker,
.flags = KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST,
- .arg = pkvm_pgtable.mm_ops,
};
int i, ret;

diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index fb3696b3a997..db25e81a9890 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -181,9 +181,10 @@ static int kvm_pgtable_visitor_cb(struct kvm_pgtable_walk_data *data,
}

static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data,
- kvm_pte_t *pgtable, u32 level);
+ struct kvm_pgtable_mm_ops *mm_ops, kvm_pte_t *pgtable, u32 level);

static inline int __kvm_pgtable_visit(struct kvm_pgtable_walk_data *data,
+ struct kvm_pgtable_mm_ops *mm_ops,
kvm_pte_t *ptep, u32 level)
{
enum kvm_pgtable_walk_flags flags = data->walker->flags;
@@ -191,6 +192,7 @@ static inline int __kvm_pgtable_visit(struct kvm_pgtable_walk_data *data,
.ptep = ptep,
.old = READ_ONCE(*ptep),
.arg = data->walker->arg,
+ .mm_ops = mm_ops,
.addr = data->addr,
.end = data->end,
.level = level,
@@ -218,8 +220,8 @@ static inline int __kvm_pgtable_visit(struct kvm_pgtable_walk_data *data,
goto out;
}

- childp = kvm_pte_follow(ctx.old, data->pgt->mm_ops);
- ret = __kvm_pgtable_walk(data, childp, level + 1);
+ childp = kvm_pte_follow(ctx.old, mm_ops);
+ ret = __kvm_pgtable_walk(data, mm_ops, childp, level + 1);
if (ret)
goto out;

@@ -231,7 +233,7 @@ static inline int __kvm_pgtable_visit(struct kvm_pgtable_walk_data *data,
}

static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data,
- kvm_pte_t *pgtable, u32 level)
+ struct kvm_pgtable_mm_ops *mm_ops, kvm_pte_t *pgtable, u32 level)
{
u32 idx;
int ret = 0;
@@ -245,7 +247,7 @@ static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data,
if (data->addr >= data->end)
break;

- ret = __kvm_pgtable_visit(data, ptep, level);
+ ret = __kvm_pgtable_visit(data, mm_ops, ptep, level);
if (ret)
break;
}
@@ -269,7 +271,7 @@ static int _kvm_pgtable_walk(struct kvm_pgtable_walk_data *data)
for (idx = kvm_pgd_page_idx(data); data->addr < data->end; ++idx) {
kvm_pte_t *ptep = &pgt->pgd[idx * PTRS_PER_PTE];

- ret = __kvm_pgtable_walk(data, ptep, pgt->start_level);
+ ret = __kvm_pgtable_walk(data, pgt->mm_ops, ptep, pgt->start_level);
if (ret)
break;
}
@@ -332,7 +334,6 @@ int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr,
struct hyp_map_data {
u64 phys;
kvm_pte_t attr;
- struct kvm_pgtable_mm_ops *mm_ops;
};

static int hyp_set_prot_attr(enum kvm_pgtable_prot prot, kvm_pte_t *ptep)
@@ -400,7 +401,7 @@ static bool hyp_map_walker_try_leaf(const struct kvm_pgtable_visit_ctx *ctx,
if (ctx->old == new)
return true;
if (!kvm_pte_valid(ctx->old))
- data->mm_ops->get_page(ctx->ptep);
+ ctx->mm_ops->get_page(ctx->ptep);
else if (WARN_ON((ctx->old ^ new) & ~KVM_PTE_LEAF_ATTR_HI_SW))
return false;

@@ -413,7 +414,7 @@ static int hyp_map_walker(const struct kvm_pgtable_visit_ctx *ctx,
{
kvm_pte_t *childp;
struct hyp_map_data *data = ctx->arg;
- struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
+ struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops;

if (hyp_map_walker_try_leaf(ctx, data))
return 0;
@@ -436,7 +437,6 @@ int kvm_pgtable_hyp_map(struct kvm_pgtable *pgt, u64 addr, u64 size, u64 phys,
int ret;
struct hyp_map_data map_data = {
.phys = ALIGN_DOWN(phys, PAGE_SIZE),
- .mm_ops = pgt->mm_ops,
};
struct kvm_pgtable_walker walker = {
.cb = hyp_map_walker,
@@ -454,18 +454,13 @@ int kvm_pgtable_hyp_map(struct kvm_pgtable *pgt, u64 addr, u64 size, u64 phys,
return ret;
}

-struct hyp_unmap_data {
- u64 unmapped;
- struct kvm_pgtable_mm_ops *mm_ops;
-};
-
static int hyp_unmap_walker(const struct kvm_pgtable_visit_ctx *ctx,
enum kvm_pgtable_walk_flags visit)
{
kvm_pte_t *childp = NULL;
u64 granule = kvm_granule_size(ctx->level);
- struct hyp_unmap_data *data = ctx->arg;
- struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
+ u64 *unmapped = ctx->arg;
+ struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops;

if (!kvm_pte_valid(ctx->old))
return -EINVAL;
@@ -486,7 +481,7 @@ static int hyp_unmap_walker(const struct kvm_pgtable_visit_ctx *ctx,
kvm_clear_pte(ctx->ptep);
dsb(ishst);
__tlbi_level(vale2is, __TLBI_VADDR(ctx->addr, 0), ctx->level);
- data->unmapped += granule;
+ *unmapped += granule;
}

dsb(ish);
@@ -501,12 +496,10 @@ static int hyp_unmap_walker(const struct kvm_pgtable_visit_ctx *ctx,

u64 kvm_pgtable_hyp_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size)
{
- struct hyp_unmap_data unmap_data = {
- .mm_ops = pgt->mm_ops,
- };
+ u64 unmapped = 0;
struct kvm_pgtable_walker walker = {
.cb = hyp_unmap_walker,
- .arg = &unmap_data,
+ .arg = &unmapped,
.flags = KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST,
};

@@ -514,7 +507,7 @@ u64 kvm_pgtable_hyp_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size)
return 0;

kvm_pgtable_walk(pgt, addr, size, &walker);
- return unmap_data.unmapped;
+ return unmapped;
}

int kvm_pgtable_hyp_init(struct kvm_pgtable *pgt, u32 va_bits,
@@ -538,7 +531,7 @@ int kvm_pgtable_hyp_init(struct kvm_pgtable *pgt, u32 va_bits,
static int hyp_free_walker(const struct kvm_pgtable_visit_ctx *ctx,
enum kvm_pgtable_walk_flags visit)
{
- struct kvm_pgtable_mm_ops *mm_ops = ctx->arg;
+ struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops;

if (!kvm_pte_valid(ctx->old))
return 0;
@@ -556,7 +549,6 @@ void kvm_pgtable_hyp_destroy(struct kvm_pgtable *pgt)
struct kvm_pgtable_walker walker = {
.cb = hyp_free_walker,
.flags = KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST,
- .arg = pgt->mm_ops,
};

WARN_ON(kvm_pgtable_walk(pgt, 0, BIT(pgt->ia_bits), &walker));
@@ -575,8 +567,6 @@ struct stage2_map_data {
struct kvm_s2_mmu *mmu;
void *memcache;

- struct kvm_pgtable_mm_ops *mm_ops;
-
/* Force mappings to page granularity */
bool force_pte;
};
@@ -725,7 +715,7 @@ static int stage2_map_walker_try_leaf(const struct kvm_pgtable_visit_ctx *ctx,
kvm_pte_t new;
u64 granule = kvm_granule_size(ctx->level), phys = data->phys;
struct kvm_pgtable *pgt = data->mmu->pgt;
- struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
+ struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops;

if (!stage2_leaf_mapping_allowed(ctx, data))
return -E2BIG;
@@ -773,7 +763,7 @@ static int stage2_map_walk_table_pre(const struct kvm_pgtable_visit_ctx *ctx,
if (!stage2_leaf_mapping_allowed(ctx, data))
return 0;

- data->childp = kvm_pte_follow(ctx->old, data->mm_ops);
+ data->childp = kvm_pte_follow(ctx->old, ctx->mm_ops);
kvm_clear_pte(ctx->ptep);

/*
@@ -789,7 +779,7 @@ static int stage2_map_walk_table_pre(const struct kvm_pgtable_visit_ctx *ctx,
static int stage2_map_walk_leaf(const struct kvm_pgtable_visit_ctx *ctx,
struct stage2_map_data *data)
{
- struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
+ struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops;
kvm_pte_t *childp;
int ret;

@@ -831,7 +821,7 @@ static int stage2_map_walk_leaf(const struct kvm_pgtable_visit_ctx *ctx,
static int stage2_map_walk_table_post(const struct kvm_pgtable_visit_ctx *ctx,
struct stage2_map_data *data)
{
- struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
+ struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops;
kvm_pte_t *childp;
int ret = 0;

@@ -898,7 +888,6 @@ int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
.phys = ALIGN_DOWN(phys, PAGE_SIZE),
.mmu = pgt->mmu,
.memcache = mc,
- .mm_ops = pgt->mm_ops,
.force_pte = pgt->force_pte_cb && pgt->force_pte_cb(addr, addr + size, prot),
};
struct kvm_pgtable_walker walker = {
@@ -929,7 +918,6 @@ int kvm_pgtable_stage2_set_owner(struct kvm_pgtable *pgt, u64 addr, u64 size,
.phys = KVM_PHYS_INVALID,
.mmu = pgt->mmu,
.memcache = mc,
- .mm_ops = pgt->mm_ops,
.owner_id = owner_id,
.force_pte = true,
};
@@ -953,7 +941,7 @@ static int stage2_unmap_walker(const struct kvm_pgtable_visit_ctx *ctx,
{
struct kvm_pgtable *pgt = ctx->arg;
struct kvm_s2_mmu *mmu = pgt->mmu;
- struct kvm_pgtable_mm_ops *mm_ops = pgt->mm_ops;
+ struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops;
kvm_pte_t *childp = NULL;
bool need_flush = false;

@@ -1007,7 +995,6 @@ struct stage2_attr_data {
kvm_pte_t attr_clr;
kvm_pte_t pte;
u32 level;
- struct kvm_pgtable_mm_ops *mm_ops;
};

static int stage2_attr_walker(const struct kvm_pgtable_visit_ctx *ctx,
@@ -1015,7 +1002,7 @@ static int stage2_attr_walker(const struct kvm_pgtable_visit_ctx *ctx,
{
kvm_pte_t pte = ctx->old;
struct stage2_attr_data *data = ctx->arg;
- struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
+ struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops;

if (!kvm_pte_valid(ctx->old))
return 0;
@@ -1055,7 +1042,6 @@ static int stage2_update_leaf_attrs(struct kvm_pgtable *pgt, u64 addr,
struct stage2_attr_data data = {
.attr_set = attr_set & attr_mask,
.attr_clr = attr_clr & attr_mask,
- .mm_ops = pgt->mm_ops,
};
struct kvm_pgtable_walker walker = {
.cb = stage2_attr_walker,
@@ -1198,7 +1184,7 @@ int __kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_s2_mmu *mmu,
static int stage2_free_walker(const struct kvm_pgtable_visit_ctx *ctx,
enum kvm_pgtable_walk_flags visit)
{
- struct kvm_pgtable_mm_ops *mm_ops = ctx->arg;
+ struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops;

if (!stage2_pte_is_counted(ctx->old))
return 0;
@@ -1218,7 +1204,6 @@ void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt)
.cb = stage2_free_walker,
.flags = KVM_PGTABLE_WALK_LEAF |
KVM_PGTABLE_WALK_TABLE_POST,
- .arg = pgt->mm_ops,
};

WARN_ON(kvm_pgtable_walk(pgt, 0, BIT(pgt->ia_bits), &walker));
--
2.38.1.273.g43a17bfeac-goog