[PATCH 17/21] KVM: x86/MMU: Add kvm_shadow_mmu_ to the last few functions in shadow_mmu.h

From: Ben Gardon
Date: Thu Feb 02 2023 - 13:30:03 EST

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Fix up the names of the last few Shadow MMU functions in shadow_mmu.h.
This gives a clean and obvious interface between the shared x86 MMU
code and the Shadow MMU. There are still a few functions exported from
paging_tmpl.h that are left as-is, but changing those will need to be
done separately, if at all.

No functional change intended.

Signed-off-by: Ben Gardon <bgardon@xxxxxxxxxx>
---
arch/x86/kvm/mmu/mmu.c | 19 ++++++++-------
arch/x86/kvm/mmu/shadow_mmu.c | 44 +++++++++++++++++++----------------
arch/x86/kvm/mmu/shadow_mmu.h | 16 +++++++------
3 files changed, 43 insertions(+), 36 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 156ab2e4cd811..f5b9db00eff99 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -884,7 +884,7 @@ static int fast_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
if (tdp_mmu_enabled)
sptep = kvm_tdp_mmu_fast_pf_get_last_sptep(vcpu, fault->addr, &spte);
else
- sptep = fast_pf_get_last_sptep(vcpu, fault->addr, &spte);
+ sptep = kvm_shadow_mmu_fast_pf_get_last_sptep(vcpu, fault->addr, &spte);

if (!is_shadow_present_pte(spte))
break;
@@ -1073,7 +1073,7 @@ static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu)
root = kvm_tdp_mmu_get_vcpu_root_hpa(vcpu);
mmu->root.hpa = root;
} else if (shadow_root_level >= PT64_ROOT_4LEVEL) {
- root = mmu_alloc_root(vcpu, 0, 0, shadow_root_level);
+ root = kvm_shadow_mmu_alloc_root(vcpu, 0, 0, shadow_root_level);
mmu->root.hpa = root;
} else if (shadow_root_level == PT32E_ROOT_LEVEL) {
if (WARN_ON_ONCE(!mmu->pae_root)) {
@@ -1084,8 +1084,8 @@ static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu)
for (i = 0; i < 4; ++i) {
WARN_ON_ONCE(IS_VALID_PAE_ROOT(mmu->pae_root[i]));

- root = mmu_alloc_root(vcpu, i << (30 - PAGE_SHIFT), 0,
- PT32_ROOT_LEVEL);
+ root = kvm_shadow_mmu_alloc_root(vcpu,
+ i << (30 - PAGE_SHIFT), 0, PT32_ROOT_LEVEL);
mmu->pae_root[i] = root | PT_PRESENT_MASK |
shadow_me_value;
}
@@ -1663,7 +1663,7 @@ void kvm_mmu_new_pgd(struct kvm_vcpu *vcpu, gpa_t new_pgd)
* count. Otherwise, clear the write flooding count.
*/
if (!new_role.direct)
- __clear_sp_write_flooding_count(
+ kvm_shadow_mmu_clear_sp_write_flooding_count(
to_shadow_page(vcpu->arch.mmu->root.hpa));
}
EXPORT_SYMBOL_GPL(kvm_mmu_new_pgd);
@@ -2439,13 +2439,13 @@ int kvm_mmu_load(struct kvm_vcpu *vcpu)
r = mmu_topup_memory_caches(vcpu, !vcpu->arch.mmu->root_role.direct);
if (r)
goto out;
- r = mmu_alloc_special_roots(vcpu);
+ r = kvm_shadow_mmu_alloc_special_roots(vcpu);
if (r)
goto out;
if (vcpu->arch.mmu->root_role.direct)
r = mmu_alloc_direct_roots(vcpu);
else
- r = mmu_alloc_shadow_roots(vcpu);
+ r = kvm_shadow_mmu_alloc_shadow_roots(vcpu);
if (r)
goto out;

@@ -2674,7 +2674,8 @@ static int __kvm_mmu_create(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu)
* generally doesn't use PAE paging and can skip allocating the PDP
* table. The main exception, handled here, is SVM's 32-bit NPT. The
* other exception is for shadowing L1's 32-bit or PAE NPT on 64-bit
- * KVM; that horror is handled on-demand by mmu_alloc_special_roots().
+ * KVM; that horror is handled on-demand by
+ * kvm_shadow_mmu_alloc_special_roots().
*/
if (tdp_enabled && kvm_mmu_get_tdp_level(vcpu) > PT32E_ROOT_LEVEL)
return 0;
@@ -2817,7 +2818,7 @@ int kvm_mmu_init_vm(struct kvm *kvm)
return r;
}

- node->track_write = kvm_mmu_pte_write;
+ node->track_write = kvm_shadow_mmu_pte_write;
node->track_flush_slot = kvm_mmu_invalidate_zap_pages_in_memslot;
kvm_page_track_register_notifier(kvm, node);

diff --git a/arch/x86/kvm/mmu/shadow_mmu.c b/arch/x86/kvm/mmu/shadow_mmu.c
index dfff65db97c3b..eb4424fedd73a 100644
--- a/arch/x86/kvm/mmu/shadow_mmu.c
+++ b/arch/x86/kvm/mmu/shadow_mmu.c
@@ -1404,14 +1404,14 @@ static int mmu_sync_children(struct kvm_vcpu *vcpu, struct kvm_mmu_page *parent,
return 0;
}

-void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp)
+void kvm_shadow_mmu_clear_sp_write_flooding_count(struct kvm_mmu_page *sp)
{
atomic_set(&sp->write_flooding_count, 0);
}

static void clear_sp_write_flooding_count(u64 *spte)
{
- __clear_sp_write_flooding_count(sptep_to_sp(spte));
+ kvm_shadow_mmu_clear_sp_write_flooding_count(sptep_to_sp(spte));
}

/*
@@ -1482,7 +1482,7 @@ static struct kvm_mmu_page *kvm_mmu_find_shadow_page(struct kvm *kvm,
kvm_flush_remote_tlbs(kvm);
}

- __clear_sp_write_flooding_count(sp);
+ kvm_shadow_mmu_clear_sp_write_flooding_count(sp);

goto out;
}
@@ -1607,12 +1607,13 @@ static union kvm_mmu_page_role kvm_mmu_child_role(u64 *sptep, bool direct,
* Concretely, a 4-byte PDE consumes bits 31:22, while an 8-byte PDE
* consumes bits 29:21. To consume bits 31:30, KVM's uses 4 shadow
* PDPTEs; those 4 PAE page directories are pre-allocated and their
- * quadrant is assigned in mmu_alloc_root(). A 4-byte PTE consumes
- * bits 21:12, while an 8-byte PTE consumes bits 20:12. To consume
- * bit 21 in the PTE (the child here), KVM propagates that bit to the
- * quadrant, i.e. sets quadrant to '0' or '1'. The parent 8-byte PDE
- * covers bit 21 (see above), thus the quadrant is calculated from the
- * _least_ significant bit of the PDE index.
+ * quadrant is assigned in kvm_shadow_mmu_alloc_root().
+ * A 4-byte PTE consumes bits 21:12, while an 8-byte PTE consumes
+ * bits 20:12. To consume bit 21 in the PTE (the child here), KVM
+ * propagates that bit to the quadrant, i.e. sets quadrant to
+ * '0' or '1'. The parent 8-byte PDE covers bit 21 (see above), thus
+ * the quadrant is calculated from the _least_ significant bit of the
+ * PDE index.
*/
if (role.has_4_byte_gpte) {
WARN_ON_ONCE(role.level != PG_LEVEL_4K);
@@ -2389,7 +2390,8 @@ int kvm_shadow_mmu_direct_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *faul
* - Must be called between walk_shadow_page_lockless_{begin,end}.
* - The returned sptep must not be used after walk_shadow_page_lockless_end.
*/
-u64 *fast_pf_get_last_sptep(struct kvm_vcpu *vcpu, gpa_t gpa, u64 *spte)
+u64 *kvm_shadow_mmu_fast_pf_get_last_sptep(struct kvm_vcpu *vcpu, gpa_t gpa,
+ u64 *spte)
{
struct kvm_shadow_walk_iterator iterator;
u64 old_spte;
@@ -2442,7 +2444,8 @@ static int mmu_check_root(struct kvm_vcpu *vcpu, gfn_t root_gfn)
return ret;
}

-hpa_t mmu_alloc_root(struct kvm_vcpu *vcpu, gfn_t gfn, int quadrant, u8 level)
+hpa_t kvm_shadow_mmu_alloc_root(struct kvm_vcpu *vcpu, gfn_t gfn, int quadrant,
+ u8 level)
{
union kvm_mmu_page_role role = vcpu->arch.mmu->root_role;
struct kvm_mmu_page *sp;
@@ -2459,7 +2462,7 @@ hpa_t mmu_alloc_root(struct kvm_vcpu *vcpu, gfn_t gfn, int quadrant, u8 level)
return __pa(sp->spt);
}

-static int mmu_first_shadow_root_alloc(struct kvm *kvm)
+static int kvm_shadow_mmu_first_shadow_root_alloc(struct kvm *kvm)
{
struct kvm_memslots *slots;
struct kvm_memory_slot *slot;
@@ -2520,7 +2523,7 @@ static int mmu_first_shadow_root_alloc(struct kvm *kvm)
return r;
}

-int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
+int kvm_shadow_mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
{
struct kvm_mmu *mmu = vcpu->arch.mmu;
u64 pdptrs[4], pm_mask;
@@ -2549,7 +2552,7 @@ int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
}
}

- r = mmu_first_shadow_root_alloc(vcpu->kvm);
+ r = kvm_shadow_mmu_first_shadow_root_alloc(vcpu->kvm);
if (r)
return r;

@@ -2563,8 +2566,8 @@ int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
* write-protect the guests page table root.
*/
if (mmu->cpu_role.base.level >= PT64_ROOT_4LEVEL) {
- root = mmu_alloc_root(vcpu, root_gfn, 0,
- mmu->root_role.level);
+ root = kvm_shadow_mmu_alloc_root(vcpu, root_gfn, 0,
+ mmu->root_role.level);
mmu->root.hpa = root;
goto set_root_pgd;
}
@@ -2617,7 +2620,8 @@ int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
*/
quadrant = (mmu->cpu_role.base.level == PT32_ROOT_LEVEL) ? i : 0;

- root = mmu_alloc_root(vcpu, root_gfn, quadrant, PT32_ROOT_LEVEL);
+ root = kvm_shadow_mmu_alloc_root(vcpu, root_gfn, quadrant,
+ PT32_ROOT_LEVEL);
mmu->pae_root[i] = root | pm_mask;
}

@@ -2636,7 +2640,7 @@ int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
return r;
}

-int mmu_alloc_special_roots(struct kvm_vcpu *vcpu)
+int kvm_shadow_mmu_alloc_special_roots(struct kvm_vcpu *vcpu)
{
struct kvm_mmu *mmu = vcpu->arch.mmu;
bool need_pml5 = mmu->root_role.level > PT64_ROOT_4LEVEL;
@@ -3009,8 +3013,8 @@ static u64 *get_written_sptes(struct kvm_mmu_page *sp, gpa_t gpa, int *nspte)
return spte;
}

-void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
- int bytes, struct kvm_page_track_notifier_node *node)
+void kvm_shadow_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
+ int bytes, struct kvm_page_track_notifier_node *node)
{
gfn_t gfn = gpa >> PAGE_SHIFT;
struct kvm_mmu_page *sp;
diff --git a/arch/x86/kvm/mmu/shadow_mmu.h b/arch/x86/kvm/mmu/shadow_mmu.h
index e4fbc842f524e..4d39017873aa6 100644
--- a/arch/x86/kvm/mmu/shadow_mmu.h
+++ b/arch/x86/kvm/mmu/shadow_mmu.h
@@ -39,7 +39,7 @@ struct pte_list_desc {
/* Only exported for debugfs.c. */
unsigned int pte_list_count(struct kvm_rmap_head *rmap_head);

-void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp);
+void kvm_shadow_mmu_clear_sp_write_flooding_count(struct kvm_mmu_page *sp);

bool __kvm_shadow_mmu_prepare_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp,
struct list_head *invalid_list,
@@ -54,17 +54,19 @@ int kvm_shadow_mmu_make_pages_available(struct kvm_vcpu *vcpu);
int kvm_shadow_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);

int kvm_shadow_mmu_direct_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault);
-u64 *fast_pf_get_last_sptep(struct kvm_vcpu *vcpu, gpa_t gpa, u64 *spte);
+u64 *kvm_shadow_mmu_fast_pf_get_last_sptep(struct kvm_vcpu *vcpu, gpa_t gpa,
+ u64 *spte);

-hpa_t mmu_alloc_root(struct kvm_vcpu *vcpu, gfn_t gfn, int quadrant, u8 level);
-int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu);
-int mmu_alloc_special_roots(struct kvm_vcpu *vcpu);
+hpa_t kvm_shadow_mmu_alloc_root(struct kvm_vcpu *vcpu, gfn_t gfn, int quadrant,
+ u8 level);
+int kvm_shadow_mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu);
+int kvm_shadow_mmu_alloc_special_roots(struct kvm_vcpu *vcpu);

int kvm_shadow_mmu_get_walk(struct kvm_vcpu *vcpu, u64 addr, u64 *sptes,
int *root_level);

-void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
- int bytes, struct kvm_page_track_notifier_node *node);
+void kvm_shadow_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
+ int bytes, struct kvm_page_track_notifier_node *node);

void kvm_shadow_mmu_zap_obsolete_pages(struct kvm *kvm);
bool kvm_shadow_mmu_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end);
--
2.39.1.519.gcb327c4b5f-goog

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