[PATCH 06/18] KVM: x86/mmu: Pass address space ID to TDP MMU root walkers
Sean Christopherson
seanjc at google.com
Fri Mar 26 02:19:45 GMT 2021
Move the address space ID check that is performed when iterating over
roots into the macro helpers to consolidate code.
No functional change intended.
Signed-off-by: Sean Christopherson <seanjc at google.com>
---
arch/x86/kvm/mmu/mmu_internal.h | 7 ++-
arch/x86/kvm/mmu/tdp_mmu.c | 99 ++++++++++++---------------------
2 files changed, 42 insertions(+), 64 deletions(-)
diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index db2faa806ab7..cead1d81e663 100644
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -129,9 +129,14 @@ static inline bool kvm_mmu_put_root(struct kvm *kvm, struct kvm_mmu_page *sp)
return !sp->root_count;
}
+static inline int kvm_mmu_role_as_id(union kvm_mmu_page_role role)
+{
+ return role.smm ? 1 : 0;
+}
+
static inline int kvm_mmu_page_as_id(struct kvm_mmu_page *sp)
{
- return sp->role.smm ? 1 : 0;
+ return kvm_mmu_role_as_id(sp->role);
}
/*
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index bf279fff70ea..7fe5004b1565 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -76,14 +76,18 @@ static inline struct kvm_mmu_page *tdp_mmu_next_root(struct kvm *kvm,
* if exiting the loop early, the caller must drop the reference to the most
* recent root. (Unless keeping a live reference is desirable.)
*/
-#define for_each_tdp_mmu_root_yield_safe(_kvm, _root) \
+#define for_each_tdp_mmu_root_yield_safe(_kvm, _root, _as_id) \
for (_root = list_first_entry(&_kvm->arch.tdp_mmu_roots, \
typeof(*_root), link); \
tdp_mmu_next_root_valid(_kvm, _root); \
- _root = tdp_mmu_next_root(_kvm, _root))
+ _root = tdp_mmu_next_root(_kvm, _root)) \
+ if (kvm_mmu_page_as_id(_root) != _as_id) { \
+ } else
-#define for_each_tdp_mmu_root(_kvm, _root) \
- list_for_each_entry(_root, &_kvm->arch.tdp_mmu_roots, link)
+#define for_each_tdp_mmu_root(_kvm, _root, _as_id) \
+ list_for_each_entry(_root, &_kvm->arch.tdp_mmu_roots, link) \
+ if (kvm_mmu_page_as_id(_root) != _as_id) { \
+ } else
static bool zap_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root,
gfn_t start, gfn_t end, bool can_yield, bool flush);
@@ -148,7 +152,7 @@ hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu)
role = page_role_for_level(vcpu, vcpu->arch.mmu->shadow_root_level);
/* Check for an existing root before allocating a new one. */
- for_each_tdp_mmu_root(kvm, root) {
+ for_each_tdp_mmu_root(kvm, root, kvm_mmu_role_as_id(role)) {
if (root->role.word == role.word) {
kvm_mmu_get_root(kvm, root);
goto out;
@@ -709,11 +713,8 @@ bool __kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, int as_id, gfn_t start,
{
struct kvm_mmu_page *root;
- for_each_tdp_mmu_root_yield_safe(kvm, root) {
- if (kvm_mmu_page_as_id(root) != as_id)
- continue;
+ for_each_tdp_mmu_root_yield_safe(kvm, root, as_id)
flush = zap_gfn_range(kvm, root, start, end, can_yield, flush);
- }
return flush;
}
@@ -893,27 +894,28 @@ static __always_inline int kvm_tdp_mmu_handle_hva_range(struct kvm *kvm,
int ret = 0;
int as_id;
- for_each_tdp_mmu_root_yield_safe(kvm, root) {
- as_id = kvm_mmu_page_as_id(root);
- slots = __kvm_memslots(kvm, as_id);
- kvm_for_each_memslot(memslot, slots) {
- unsigned long hva_start, hva_end;
- gfn_t gfn_start, gfn_end;
+ for (as_id = 0; as_id < KVM_ADDRESS_SPACE_NUM; as_id++) {
+ for_each_tdp_mmu_root_yield_safe(kvm, root, as_id) {
+ slots = __kvm_memslots(kvm, as_id);
+ kvm_for_each_memslot(memslot, slots) {
+ unsigned long hva_start, hva_end;
+ gfn_t gfn_start, gfn_end;
- hva_start = max(start, memslot->userspace_addr);
- hva_end = min(end, memslot->userspace_addr +
- (memslot->npages << PAGE_SHIFT));
- if (hva_start >= hva_end)
- continue;
- /*
- * {gfn(page) | page intersects with [hva_start, hva_end)} =
- * {gfn_start, gfn_start+1, ..., gfn_end-1}.
- */
- gfn_start = hva_to_gfn_memslot(hva_start, memslot);
- gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
+ hva_start = max(start, memslot->userspace_addr);
+ hva_end = min(end, memslot->userspace_addr +
+ (memslot->npages << PAGE_SHIFT));
+ if (hva_start >= hva_end)
+ continue;
+ /*
+ * {gfn(page) | page intersects with [hva_start, hva_end)} =
+ * {gfn_start, gfn_start+1, ..., gfn_end-1}.
+ */
+ gfn_start = hva_to_gfn_memslot(hva_start, memslot);
+ gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
- ret |= handler(kvm, memslot, root, gfn_start,
- gfn_end, data);
+ ret |= handler(kvm, memslot, root, gfn_start,
+ gfn_end, data);
+ }
}
}
@@ -1125,17 +1127,11 @@ bool kvm_tdp_mmu_wrprot_slot(struct kvm *kvm, struct kvm_memory_slot *slot,
int min_level)
{
struct kvm_mmu_page *root;
- int root_as_id;
bool spte_set = false;
- for_each_tdp_mmu_root_yield_safe(kvm, root) {
- root_as_id = kvm_mmu_page_as_id(root);
- if (root_as_id != slot->as_id)
- continue;
-
+ for_each_tdp_mmu_root_yield_safe(kvm, root, slot->as_id)
spte_set |= wrprot_gfn_range(kvm, root, slot->base_gfn,
slot->base_gfn + slot->npages, min_level);
- }
return spte_set;
}
@@ -1190,17 +1186,11 @@ static bool clear_dirty_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root,
bool kvm_tdp_mmu_clear_dirty_slot(struct kvm *kvm, struct kvm_memory_slot *slot)
{
struct kvm_mmu_page *root;
- int root_as_id;
bool spte_set = false;
- for_each_tdp_mmu_root_yield_safe(kvm, root) {
- root_as_id = kvm_mmu_page_as_id(root);
- if (root_as_id != slot->as_id)
- continue;
-
+ for_each_tdp_mmu_root_yield_safe(kvm, root, slot->as_id)
spte_set |= clear_dirty_gfn_range(kvm, root, slot->base_gfn,
slot->base_gfn + slot->npages);
- }
return spte_set;
}
@@ -1262,16 +1252,10 @@ void kvm_tdp_mmu_clear_dirty_pt_masked(struct kvm *kvm,
bool wrprot)
{
struct kvm_mmu_page *root;
- int root_as_id;
lockdep_assert_held_write(&kvm->mmu_lock);
- for_each_tdp_mmu_root(kvm, root) {
- root_as_id = kvm_mmu_page_as_id(root);
- if (root_as_id != slot->as_id)
- continue;
-
+ for_each_tdp_mmu_root(kvm, root, slot->as_id)
clear_dirty_pt_masked(kvm, root, gfn, mask, wrprot);
- }
}
/*
@@ -1324,15 +1308,9 @@ bool kvm_tdp_mmu_zap_collapsible_sptes(struct kvm *kvm,
struct kvm_memory_slot *slot, bool flush)
{
struct kvm_mmu_page *root;
- int root_as_id;
-
- for_each_tdp_mmu_root_yield_safe(kvm, root) {
- root_as_id = kvm_mmu_page_as_id(root);
- if (root_as_id != slot->as_id)
- continue;
+ for_each_tdp_mmu_root_yield_safe(kvm, root, slot->as_id)
flush = zap_collapsible_spte_range(kvm, root, slot, flush);
- }
return flush;
}
@@ -1376,17 +1354,12 @@ bool kvm_tdp_mmu_write_protect_gfn(struct kvm *kvm,
struct kvm_memory_slot *slot, gfn_t gfn)
{
struct kvm_mmu_page *root;
- int root_as_id;
bool spte_set = false;
lockdep_assert_held_write(&kvm->mmu_lock);
- for_each_tdp_mmu_root(kvm, root) {
- root_as_id = kvm_mmu_page_as_id(root);
- if (root_as_id != slot->as_id)
- continue;
-
+ for_each_tdp_mmu_root(kvm, root, slot->as_id)
spte_set |= write_protect_gfn(kvm, root, gfn);
- }
+
return spte_set;
}
--
2.31.0.291.g576ba9dcdaf-goog
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