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-rw-r--r--arch/x86/include/asm/kvm_host.h2
-rw-r--r--arch/x86/kvm/mmu/mmu.c90
-rw-r--r--arch/x86/kvm/mmu/page_track.c8
-rw-r--r--arch/x86/kvm/mmu/paging_tmpl.h8
-rw-r--r--arch/x86/kvm/mmu/tdp_mmu.c20
-rw-r--r--arch/x86/kvm/x86.c4
-rw-r--r--include/linux/kvm_host.h5
-rw-r--r--virt/kvm/dirty_ring.c5
-rw-r--r--virt/kvm/kvm_main.c37
-rw-r--r--virt/kvm/mmu_lock.h23
10 files changed, 118 insertions, 84 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index fa7b2df6422b..c445a51244d3 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -348,6 +348,8 @@ struct kvm_mmu_root_info {
#define KVM_MMU_NUM_PREV_ROOTS 3
+#define KVM_HAVE_MMU_RWLOCK
+
struct kvm_mmu_page;
/*
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 5b364ff9c115..329930d57774 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2010,9 +2010,9 @@ static void mmu_sync_children(struct kvm_vcpu *vcpu,
flush |= kvm_sync_page(vcpu, sp, &invalid_list);
mmu_pages_clear_parents(&parents);
}
- if (need_resched() || spin_needbreak(&vcpu->kvm->mmu_lock)) {
+ if (need_resched() || rwlock_needbreak(&vcpu->kvm->mmu_lock)) {
kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
- cond_resched_lock(&vcpu->kvm->mmu_lock);
+ cond_resched_rwlock_write(&vcpu->kvm->mmu_lock);
flush = false;
}
}
@@ -2464,7 +2464,7 @@ static int make_mmu_pages_available(struct kvm_vcpu *vcpu)
*/
void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned long goal_nr_mmu_pages)
{
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
if (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages) {
kvm_mmu_zap_oldest_mmu_pages(kvm, kvm->arch.n_used_mmu_pages -
@@ -2475,7 +2475,7 @@ void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned long goal_nr_mmu_pages)
kvm->arch.n_max_mmu_pages = goal_nr_mmu_pages;
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
}
int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn)
@@ -2486,7 +2486,7 @@ int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn)
pgprintk("%s: looking for gfn %llx\n", __func__, gfn);
r = 0;
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
for_each_gfn_indirect_valid_sp(kvm, sp, gfn) {
pgprintk("%s: gfn %llx role %x\n", __func__, gfn,
sp->role.word);
@@ -2494,7 +2494,7 @@ int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn)
kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list);
}
kvm_mmu_commit_zap_page(kvm, &invalid_list);
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
return r;
}
@@ -3186,7 +3186,7 @@ void kvm_mmu_free_roots(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
return;
}
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++)
if (roots_to_free & KVM_MMU_ROOT_PREVIOUS(i))
@@ -3209,7 +3209,7 @@ void kvm_mmu_free_roots(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
}
kvm_mmu_commit_zap_page(kvm, &invalid_list);
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
}
EXPORT_SYMBOL_GPL(kvm_mmu_free_roots);
@@ -3230,16 +3230,16 @@ static hpa_t mmu_alloc_root(struct kvm_vcpu *vcpu, gfn_t gfn, gva_t gva,
{
struct kvm_mmu_page *sp;
- spin_lock(&vcpu->kvm->mmu_lock);
+ write_lock(&vcpu->kvm->mmu_lock);
if (make_mmu_pages_available(vcpu)) {
- spin_unlock(&vcpu->kvm->mmu_lock);
+ write_unlock(&vcpu->kvm->mmu_lock);
return INVALID_PAGE;
}
sp = kvm_mmu_get_page(vcpu, gfn, gva, level, direct, ACC_ALL);
++sp->root_count;
- spin_unlock(&vcpu->kvm->mmu_lock);
+ write_unlock(&vcpu->kvm->mmu_lock);
return __pa(sp->spt);
}
@@ -3410,17 +3410,17 @@ void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu)
!smp_load_acquire(&sp->unsync_children))
return;
- spin_lock(&vcpu->kvm->mmu_lock);
+ write_lock(&vcpu->kvm->mmu_lock);
kvm_mmu_audit(vcpu, AUDIT_PRE_SYNC);
mmu_sync_children(vcpu, sp);
kvm_mmu_audit(vcpu, AUDIT_POST_SYNC);
- spin_unlock(&vcpu->kvm->mmu_lock);
+ write_unlock(&vcpu->kvm->mmu_lock);
return;
}
- spin_lock(&vcpu->kvm->mmu_lock);
+ write_lock(&vcpu->kvm->mmu_lock);
kvm_mmu_audit(vcpu, AUDIT_PRE_SYNC);
for (i = 0; i < 4; ++i) {
@@ -3434,7 +3434,7 @@ void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu)
}
kvm_mmu_audit(vcpu, AUDIT_POST_SYNC);
- spin_unlock(&vcpu->kvm->mmu_lock);
+ write_unlock(&vcpu->kvm->mmu_lock);
}
EXPORT_SYMBOL_GPL(kvm_mmu_sync_roots);
@@ -3718,7 +3718,7 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
return r;
r = RET_PF_RETRY;
- spin_lock(&vcpu->kvm->mmu_lock);
+ write_lock(&vcpu->kvm->mmu_lock);
if (mmu_notifier_retry(vcpu->kvm, mmu_seq))
goto out_unlock;
r = make_mmu_pages_available(vcpu);
@@ -3733,7 +3733,7 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
prefault, is_tdp);
out_unlock:
- spin_unlock(&vcpu->kvm->mmu_lock);
+ write_unlock(&vcpu->kvm->mmu_lock);
kvm_release_pfn_clean(pfn);
return r;
}
@@ -4959,7 +4959,7 @@ static void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
*/
mmu_topup_memory_caches(vcpu, true);
- spin_lock(&vcpu->kvm->mmu_lock);
+ write_lock(&vcpu->kvm->mmu_lock);
gentry = mmu_pte_write_fetch_gpte(vcpu, &gpa, &bytes);
@@ -4991,7 +4991,7 @@ static void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
}
kvm_mmu_flush_or_zap(vcpu, &invalid_list, remote_flush, local_flush);
kvm_mmu_audit(vcpu, AUDIT_POST_PTE_WRITE);
- spin_unlock(&vcpu->kvm->mmu_lock);
+ write_unlock(&vcpu->kvm->mmu_lock);
}
int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva)
@@ -5189,14 +5189,14 @@ slot_handle_level_range(struct kvm *kvm, struct kvm_memory_slot *memslot,
if (iterator.rmap)
flush |= fn(kvm, iterator.rmap);
- if (need_resched() || spin_needbreak(&kvm->mmu_lock)) {
+ if (need_resched() || rwlock_needbreak(&kvm->mmu_lock)) {
if (flush && lock_flush_tlb) {
kvm_flush_remote_tlbs_with_address(kvm,
start_gfn,
iterator.gfn - start_gfn + 1);
flush = false;
}
- cond_resched_lock(&kvm->mmu_lock);
+ cond_resched_rwlock_write(&kvm->mmu_lock);
}
}
@@ -5346,7 +5346,7 @@ restart:
* be in active use by the guest.
*/
if (batch >= BATCH_ZAP_PAGES &&
- cond_resched_lock(&kvm->mmu_lock)) {
+ cond_resched_rwlock_write(&kvm->mmu_lock)) {
batch = 0;
goto restart;
}
@@ -5379,7 +5379,7 @@ static void kvm_mmu_zap_all_fast(struct kvm *kvm)
{
lockdep_assert_held(&kvm->slots_lock);
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
trace_kvm_mmu_zap_all_fast(kvm);
/*
@@ -5406,7 +5406,7 @@ static void kvm_mmu_zap_all_fast(struct kvm *kvm)
if (kvm->arch.tdp_mmu_enabled)
kvm_tdp_mmu_zap_all(kvm);
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
}
static bool kvm_has_zapped_obsolete_pages(struct kvm *kvm)
@@ -5448,7 +5448,7 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
int i;
bool flush;
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
slots = __kvm_memslots(kvm, i);
kvm_for_each_memslot(memslot, slots) {
@@ -5472,7 +5472,7 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
kvm_flush_remote_tlbs(kvm);
}
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
}
static bool slot_rmap_write_protect(struct kvm *kvm,
@@ -5487,12 +5487,12 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm,
{
bool flush;
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
flush = slot_handle_level(kvm, memslot, slot_rmap_write_protect,
start_level, KVM_MAX_HUGEPAGE_LEVEL, false);
if (kvm->arch.tdp_mmu_enabled)
flush |= kvm_tdp_mmu_wrprot_slot(kvm, memslot, PG_LEVEL_4K);
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
/*
* We can flush all the TLBs out of the mmu lock without TLB
@@ -5552,13 +5552,13 @@ void kvm_mmu_zap_collapsible_sptes(struct kvm *kvm,
const struct kvm_memory_slot *memslot)
{
/* FIXME: const-ify all uses of struct kvm_memory_slot. */
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
slot_handle_leaf(kvm, (struct kvm_memory_slot *)memslot,
kvm_mmu_zap_collapsible_spte, true);
if (kvm->arch.tdp_mmu_enabled)
kvm_tdp_mmu_zap_collapsible_sptes(kvm, memslot);
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
}
void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm,
@@ -5581,11 +5581,11 @@ void kvm_mmu_slot_leaf_clear_dirty(struct kvm *kvm,
{
bool flush;
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
flush = slot_handle_leaf(kvm, memslot, __rmap_clear_dirty, false);
if (kvm->arch.tdp_mmu_enabled)
flush |= kvm_tdp_mmu_clear_dirty_slot(kvm, memslot);
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
/*
* It's also safe to flush TLBs out of mmu lock here as currently this
@@ -5603,12 +5603,12 @@ void kvm_mmu_slot_largepage_remove_write_access(struct kvm *kvm,
{
bool flush;
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
flush = slot_handle_large_level(kvm, memslot, slot_rmap_write_protect,
false);
if (kvm->arch.tdp_mmu_enabled)
flush |= kvm_tdp_mmu_wrprot_slot(kvm, memslot, PG_LEVEL_2M);
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
if (flush)
kvm_arch_flush_remote_tlbs_memslot(kvm, memslot);
@@ -5620,11 +5620,11 @@ void kvm_mmu_slot_set_dirty(struct kvm *kvm,
{
bool flush;
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
flush = slot_handle_all_level(kvm, memslot, __rmap_set_dirty, false);
if (kvm->arch.tdp_mmu_enabled)
flush |= kvm_tdp_mmu_slot_set_dirty(kvm, memslot);
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
if (flush)
kvm_arch_flush_remote_tlbs_memslot(kvm, memslot);
@@ -5637,14 +5637,14 @@ void kvm_mmu_zap_all(struct kvm *kvm)
LIST_HEAD(invalid_list);
int ign;
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
restart:
list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link) {
if (WARN_ON(sp->role.invalid))
continue;
if (__kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list, &ign))
goto restart;
- if (cond_resched_lock(&kvm->mmu_lock))
+ if (cond_resched_rwlock_write(&kvm->mmu_lock))
goto restart;
}
@@ -5653,7 +5653,7 @@ restart:
if (kvm->arch.tdp_mmu_enabled)
kvm_tdp_mmu_zap_all(kvm);
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
}
void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm, u64 gen)
@@ -5713,7 +5713,7 @@ mmu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
continue;
idx = srcu_read_lock(&kvm->srcu);
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
if (kvm_has_zapped_obsolete_pages(kvm)) {
kvm_mmu_commit_zap_page(kvm,
@@ -5724,7 +5724,7 @@ mmu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
freed = kvm_mmu_zap_oldest_mmu_pages(kvm, sc->nr_to_scan);
unlock:
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
srcu_read_unlock(&kvm->srcu, idx);
/*
@@ -5944,7 +5944,7 @@ static void kvm_recover_nx_lpages(struct kvm *kvm)
ulong to_zap;
rcu_idx = srcu_read_lock(&kvm->srcu);
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
ratio = READ_ONCE(nx_huge_pages_recovery_ratio);
to_zap = ratio ? DIV_ROUND_UP(kvm->stat.nx_lpage_splits, ratio) : 0;
@@ -5969,14 +5969,14 @@ static void kvm_recover_nx_lpages(struct kvm *kvm)
WARN_ON_ONCE(sp->lpage_disallowed);
}
- if (need_resched() || spin_needbreak(&kvm->mmu_lock)) {
+ if (need_resched() || rwlock_needbreak(&kvm->mmu_lock)) {
kvm_mmu_commit_zap_page(kvm, &invalid_list);
- cond_resched_lock(&kvm->mmu_lock);
+ cond_resched_rwlock_write(&kvm->mmu_lock);
}
}
kvm_mmu_commit_zap_page(kvm, &invalid_list);
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
srcu_read_unlock(&kvm->srcu, rcu_idx);
}
diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c
index 8443a675715b..34bb0ec69bd8 100644
--- a/arch/x86/kvm/mmu/page_track.c
+++ b/arch/x86/kvm/mmu/page_track.c
@@ -184,9 +184,9 @@ kvm_page_track_register_notifier(struct kvm *kvm,
head = &kvm->arch.track_notifier_head;
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
hlist_add_head_rcu(&n->node, &head->track_notifier_list);
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
}
EXPORT_SYMBOL_GPL(kvm_page_track_register_notifier);
@@ -202,9 +202,9 @@ kvm_page_track_unregister_notifier(struct kvm *kvm,
head = &kvm->arch.track_notifier_head;
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
hlist_del_rcu(&n->node);
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
synchronize_srcu(&head->track_srcu);
}
EXPORT_SYMBOL_GPL(kvm_page_track_unregister_notifier);
diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
index 50e268eb8e1a..d9f66cc459e8 100644
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h
@@ -868,7 +868,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t addr, u32 error_code,
}
r = RET_PF_RETRY;
- spin_lock(&vcpu->kvm->mmu_lock);
+ write_lock(&vcpu->kvm->mmu_lock);
if (mmu_notifier_retry(vcpu->kvm, mmu_seq))
goto out_unlock;
@@ -881,7 +881,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t addr, u32 error_code,
kvm_mmu_audit(vcpu, AUDIT_POST_PAGE_FAULT);
out_unlock:
- spin_unlock(&vcpu->kvm->mmu_lock);
+ write_unlock(&vcpu->kvm->mmu_lock);
kvm_release_pfn_clean(pfn);
return r;
}
@@ -919,7 +919,7 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva, hpa_t root_hpa)
return;
}
- spin_lock(&vcpu->kvm->mmu_lock);
+ write_lock(&vcpu->kvm->mmu_lock);
for_each_shadow_entry_using_root(vcpu, root_hpa, gva, iterator) {
level = iterator.level;
sptep = iterator.sptep;
@@ -954,7 +954,7 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva, hpa_t root_hpa)
if (!is_shadow_present_pte(*sptep) || !sp->unsync_children)
break;
}
- spin_unlock(&vcpu->kvm->mmu_lock);
+ write_unlock(&vcpu->kvm->mmu_lock);
}
/* Note, @addr is a GPA when gva_to_gpa() translates an L2 GPA to an L1 GPA. */
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 9e4009068920..f1fbed72e149 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -59,7 +59,7 @@ static void tdp_mmu_put_root(struct kvm *kvm, struct kvm_mmu_page *root)
static inline bool tdp_mmu_next_root_valid(struct kvm *kvm,
struct kvm_mmu_page *root)
{
- lockdep_assert_held(&kvm->mmu_lock);
+ lockdep_assert_held_write(&kvm->mmu_lock);
if (list_entry_is_head(root, &kvm->arch.tdp_mmu_roots, link))
return false;
@@ -117,7 +117,7 @@ void kvm_tdp_mmu_free_root(struct kvm *kvm, struct kvm_mmu_page *root)
{
gfn_t max_gfn = 1ULL << (shadow_phys_bits - PAGE_SHIFT);
- lockdep_assert_held(&kvm->mmu_lock);
+ lockdep_assert_held_write(&kvm->mmu_lock);
WARN_ON(root->root_count);
WARN_ON(!root->tdp_mmu_page);
@@ -170,13 +170,13 @@ static struct kvm_mmu_page *get_tdp_mmu_vcpu_root(struct kvm_vcpu *vcpu)
role = page_role_for_level(vcpu, vcpu->arch.mmu->shadow_root_level);
- spin_lock(&kvm->mmu_lock);
+ write_lock(&kvm->mmu_lock);
/* Check for an existing root before allocating a new one. */
for_each_tdp_mmu_root(kvm, root) {
if (root->role.word == role.word) {
kvm_mmu_get_root(kvm, root);
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
return root;
}
}
@@ -186,7 +186,7 @@ static struct kvm_mmu_page *get_tdp_mmu_vcpu_root(struct kvm_vcpu *vcpu)
list_add(&root->link, &kvm->arch.tdp_mmu_roots);
- spin_unlock(&kvm->mmu_lock);
+ write_unlock(&kvm->mmu_lock);
return root;
}
@@ -421,7 +421,7 @@ static inline void __tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter,
struct kvm_mmu_page *root = sptep_to_sp(root_pt);
int as_id = kvm_mmu_page_as_id(root);
- lockdep_assert_held(&kvm->mmu_lock);
+ lockdep_assert_held_write(&kvm->mmu_lock);
WRITE_ONCE(*rcu_dereference(iter->sptep), new_spte);
@@ -492,13 +492,13 @@ static inline bool tdp_mmu_iter_cond_resched(struct kvm *kvm,
if (iter->next_last_level_gfn == iter->yielded_gfn)
return false;
- if (need_resched() || spin_needbreak(&kvm->mmu_lock)) {
+ if (need_resched() || rwlock_needbreak(&kvm->mmu_lock)) {
rcu_read_unlock();
if (flush)
kvm_flush_remote_tlbs(kvm);
- cond_resched_lock(&kvm->mmu_lock);
+ cond_resched_rwlock_write(&kvm->mmu_lock);
rcu_read_lock();
WARN_ON(iter->gfn > iter->next_last_level_gfn);
@@ -1103,7 +1103,7 @@ void kvm_tdp_mmu_clear_dirty_pt_masked(struct kvm *kvm,
struct kvm_mmu_page *root;
int root_as_id;
- lockdep_assert_held(&kvm->mmu_lock);
+ 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)
@@ -1268,7 +1268,7 @@ bool kvm_tdp_mmu_write_protect_gfn(struct kvm *kvm,
int root_as_id;
bool spte_set = false;
- lockdep_assert_held(&kvm->mmu_lock);
+ 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)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 912fc418ce99..b3b1cce939ab 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7112,9 +7112,9 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
if (vcpu->arch.mmu->direct_map) {
unsigned int indirect_shadow_pages;
- spin_lock(&vcpu->kvm->mmu_lock);
+ write_lock(&vcpu->kvm->mmu_lock);
indirect_shadow_pages = vcpu->kvm->arch.indirect_shadow_pages;
- spin_unlock(&vcpu->kvm->mmu_lock);
+ write_unlock(&vcpu->kvm->mmu_lock);
if (indirect_shadow_pages)
kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index f3b1013fb22c..f417447129b9 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -451,7 +451,12 @@ struct kvm_memslots {
};
struct kvm {
+#ifdef KVM_HAVE_MMU_RWLOCK
+ rwlock_t mmu_lock;
+#else
spinlock_t mmu_lock;
+#endif /* KVM_HAVE_MMU_RWLOCK */
+
struct mutex slots_lock;
struct mm_struct *mm; /* userspace tied to this vm */
struct kvm_memslots __rcu *memslots[KVM_ADDRESS_SPACE_NUM];
diff --git a/virt/kvm/dirty_ring.c b/virt/kvm/dirty_ring.c
index 790f17325f8d..7aafefc50aa7 100644
--- a/virt/kvm/dirty_ring.c
+++ b/virt/kvm/dirty_ring.c
@@ -9,6 +9,7 @@
#include <linux/vmalloc.h>
#include <linux/kvm_dirty_ring.h>
#include <trace/events/kvm.h>
+#include "mmu_lock.h"
int __weak kvm_cpu_dirty_log_size(void)
{
@@ -60,9 +61,9 @@ static void kvm_reset_dirty_gfn(struct kvm *kvm, u32 slot, u64 offset, u64 mask)
if (!memslot || (offset + __fls(mask)) >= memslot->npages)
return;
- spin_lock(&kvm->mmu_lock);
+ KVM_MMU_LOCK(kvm);
kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, offset, mask);
- spin_unlock(&kvm->mmu_lock);
+ KVM_MMU_UNLOCK(kvm);
}
int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, int index, u32 size)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 335a1a2b8edc..48ccdf4e3d04 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -58,6 +58,7 @@
#include "coalesced_mmio.h"
#include "async_pf.h"
+#include "mmu_lock.h"
#include "vfio.h"
#define CREATE_TRACE_POINTS
@@ -459,13 +460,15 @@ static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
int idx;
idx = srcu_read_lock(&kvm->srcu);
- spin_lock(&kvm->mmu_lock);
+
+ KVM_MMU_LOCK(kvm);
+
kvm->mmu_notifier_seq++;
if (kvm_set_spte_hva(kvm, address, pte))
kvm_flush_remote_tlbs(kvm);
- spin_unlock(&kvm->mmu_lock);
+ KVM_MMU_UNLOCK(kvm);
srcu_read_unlock(&kvm->srcu, idx);
}
@@ -476,7 +479,7 @@ static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
int need_tlb_flush = 0, idx;
idx = srcu_read_lock(&kvm->srcu);
- spin_lock(&kvm->mmu_lock);
+ KVM_MMU_LOCK(kvm);
/*
* The count increase must become visible at unlock time as no
* spte can be established without taking the mmu_lock and
@@ -489,7 +492,7 @@ static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
if (need_tlb_flush || kvm->tlbs_dirty)
kvm_flush_remote_tlbs(kvm);
- spin_unlock(&kvm->mmu_lock);
+ KVM_MMU_UNLOCK(kvm);
srcu_read_unlock(&kvm->srcu, idx);
return 0;
@@ -500,7 +503,7 @@ static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
{
struct kvm *kvm = mmu_notifier_to_kvm(mn);
- spin_lock(&kvm->mmu_lock);
+ KVM_MMU_LOCK(kvm);
/*
* This sequence increase will notify the kvm page fault that
* the page that is going to be mapped in the spte could have
@@ -514,7 +517,7 @@ static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
* in conjunction with the smp_rmb in mmu_notifier_retry().
*/
kvm->mmu_notifier_count--;
- spin_unlock(&kvm->mmu_lock);
+ KVM_MMU_UNLOCK(kvm);
BUG_ON(kvm->mmu_notifier_count < 0);
}
@@ -528,13 +531,13 @@ static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
int young, idx;
idx = srcu_read_lock(&kvm->srcu);
- spin_lock(&kvm->mmu_lock);
+ KVM_MMU_LOCK(kvm);
young = kvm_age_hva(kvm, start, end);
if (young)
kvm_flush_remote_tlbs(kvm);
- spin_unlock(&kvm->mmu_lock);
+ KVM_MMU_UNLOCK(kvm);
srcu_read_unlock(&kvm->srcu, idx);
return young;
@@ -549,7 +552,7 @@ static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
int young, idx;
idx = srcu_read_lock(&kvm->srcu);
- spin_lock(&kvm->mmu_lock);
+ KVM_MMU_LOCK(kvm);
/*
* Even though we do not flush TLB, this will still adversely
* affect performance on pre-Haswell Intel EPT, where there is
@@ -564,7 +567,7 @@ static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
* more sophisticated heuristic later.
*/
young = kvm_age_hva(kvm, start, end);
- spin_unlock(&kvm->mmu_lock);
+ KVM_MMU_UNLOCK(kvm);
srcu_read_unlock(&kvm->srcu, idx);
return young;
@@ -578,9 +581,9 @@ static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
int young, idx;
idx = srcu_read_lock(&kvm->srcu);
- spin_lock(&kvm->mmu_lock);
+ KVM_MMU_LOCK(kvm);
young = kvm_test_age_hva(kvm, address);
- spin_unlock(&kvm->mmu_lock);
+ KVM_MMU_UNLOCK(kvm);
srcu_read_unlock(&kvm->srcu, idx);
return young;
@@ -745,7 +748,7 @@ static struct kvm *kvm_create_vm(unsigned long type)
if (!kvm)
return ERR_PTR(-ENOMEM);
- spin_lock_init(&kvm->mmu_lock);
+ KVM_MMU_LOCK_INIT(kvm);
mmgrab(current->mm);
kvm->mm = current->mm;
kvm_eventfd_init(kvm);
@@ -1525,7 +1528,7 @@ static int kvm_get_dirty_log_protect(struct kvm *kvm, struct kvm_dirty_log *log)
dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot);
memset(dirty_bitmap_buffer, 0, n);
- spin_lock(&kvm->mmu_lock);
+ KVM_MMU_LOCK(kvm);
for (i = 0; i < n / sizeof(long); i++) {
unsigned long mask;
gfn_t offset;
@@ -1541,7 +1544,7 @@ static int kvm_get_dirty_log_protect(struct kvm *kvm, struct kvm_dirty_log *log)
kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
offset, mask);
}
- spin_unlock(&kvm->mmu_lock);
+ KVM_MMU_UNLOCK(kvm);
}
if (flush)
@@ -1636,7 +1639,7 @@ static int kvm_clear_dirty_log_protect(struct kvm *kvm,
if (copy_from_user(dirty_bitmap_buffer, log->dirty_bitmap, n))
return -EFAULT;
- spin_lock(&kvm->mmu_lock);
+ KVM_MMU_LOCK(kvm);
for (offset = log->first_page, i = offset / BITS_PER_LONG,
n = DIV_ROUND_UP(log->num_pages, BITS_PER_LONG); n--;
i++, offset += BITS_PER_LONG) {
@@ -1659,7 +1662,7 @@ static int kvm_clear_dirty_log_protect(struct kvm *kvm,
offset, mask);
}
}
- spin_unlock(&kvm->mmu_lock);
+ KVM_MMU_UNLOCK(kvm);
if (flush)
kvm_arch_flush_remote_tlbs_memslot(kvm, memslot);
diff --git a/virt/kvm/mmu_lock.h b/virt/kvm/mmu_lock.h
new file mode 100644
index 000000000000..9e1308f9734c
--- /dev/null
+++ b/virt/kvm/mmu_lock.h
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#ifndef KVM_MMU_LOCK_H
+#define KVM_MMU_LOCK_H 1
+
+/*
+ * Architectures can choose whether to use an rwlock or spinlock
+ * for the mmu_lock. These macros, for use in common code
+ * only, avoids using #ifdefs in places that must deal with
+ * multiple architectures.
+ */
+
+#ifdef KVM_HAVE_MMU_RWLOCK
+#define KVM_MMU_LOCK_INIT(kvm) rwlock_init(&(kvm)->mmu_lock)
+#define KVM_MMU_LOCK(kvm) write_lock(&(kvm)->mmu_lock)
+#define KVM_MMU_UNLOCK(kvm) write_unlock(&(kvm)->mmu_lock)
+#else
+#define KVM_MMU_LOCK_INIT(kvm) spin_lock_init(&(kvm)->mmu_lock)
+#define KVM_MMU_LOCK(kvm) spin_lock(&(kvm)->mmu_lock)
+#define KVM_MMU_UNLOCK(kvm) spin_unlock(&(kvm)->mmu_lock)
+#endif /* KVM_HAVE_MMU_RWLOCK */
+
+#endif
generated by cgit (git 2.34.1) at 2024-06-15 21:38:14 +0000