From: Ben Gardon <bgardon@google.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>, Peter Xu <peterx@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Peter Shier <pshier@google.com>,
Peter Feiner <pfeiner@google.com>,
Junaid Shahid <junaids@google.com>,
Jim Mattson <jmattson@google.com>,
Yulei Zhang <yulei.kernel@gmail.com>,
Wanpeng Li <kernellwp@gmail.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Xiao Guangrong <xiaoguangrong.eric@gmail.com>,
Ben Gardon <bgardon@google.com>
Subject: [PATCH 16/24] kvm: mmu: Wrap mmu_lock assertions
Date: Tue, 12 Jan 2021 10:10:33 -0800 [thread overview]
Message-ID: <20210112181041.356734-17-bgardon@google.com> (raw)
In-Reply-To: <20210112181041.356734-1-bgardon@google.com>
Wrap assertions and warnings checking the MMU lock state in a function
which uses lockdep_assert_held. While the existing checks use a few
different functions to check the lock state, they are all better off
using lockdep_assert_held. This will support a refactoring to move the
mmu_lock to struct kvm_arch so that it can be replaced with an rwlock for
x86.
Reviewed-by: Peter Feiner <pfeiner@google.com>
Signed-off-by: Ben Gardon <bgardon@google.com>
---
arch/arm64/kvm/mmu.c | 2 +-
arch/powerpc/include/asm/kvm_book3s_64.h | 7 +++----
arch/powerpc/kvm/book3s_hv_nested.c | 3 +--
arch/x86/kvm/mmu/mmu_internal.h | 4 ++--
arch/x86/kvm/mmu/tdp_mmu.c | 8 ++++----
include/linux/kvm_host.h | 1 +
virt/kvm/kvm_main.c | 5 +++++
7 files changed, 17 insertions(+), 13 deletions(-)
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 57ef1ec23b56..8b54eb58bf47 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -130,7 +130,7 @@ static void __unmap_stage2_range(struct kvm_s2_mmu *mmu, phys_addr_t start, u64
struct kvm *kvm = mmu->kvm;
phys_addr_t end = start + size;
- assert_spin_locked(&kvm->mmu_lock);
+ kvm_mmu_lock_assert_held(kvm);
WARN_ON(size & ~PAGE_MASK);
WARN_ON(stage2_apply_range(kvm, start, end, kvm_pgtable_stage2_unmap,
may_block));
diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h
index 9bb9bb370b53..db2e437cd97c 100644
--- a/arch/powerpc/include/asm/kvm_book3s_64.h
+++ b/arch/powerpc/include/asm/kvm_book3s_64.h
@@ -650,8 +650,8 @@ static inline pte_t *find_kvm_secondary_pte(struct kvm *kvm, unsigned long ea,
{
pte_t *pte;
- VM_WARN(!spin_is_locked(&kvm->mmu_lock),
- "%s called with kvm mmu_lock not held \n", __func__);
+ kvm_mmu_lock_assert_held(kvm);
+
pte = __find_linux_pte(kvm->arch.pgtable, ea, NULL, hshift);
return pte;
@@ -662,8 +662,7 @@ static inline pte_t *find_kvm_host_pte(struct kvm *kvm, unsigned long mmu_seq,
{
pte_t *pte;
- VM_WARN(!spin_is_locked(&kvm->mmu_lock),
- "%s called with kvm mmu_lock not held \n", __func__);
+ kvm_mmu_lock_assert_held(kvm);
if (mmu_notifier_retry(kvm, mmu_seq))
return NULL;
diff --git a/arch/powerpc/kvm/book3s_hv_nested.c b/arch/powerpc/kvm/book3s_hv_nested.c
index 18890dca9476..6d5987d1eee7 100644
--- a/arch/powerpc/kvm/book3s_hv_nested.c
+++ b/arch/powerpc/kvm/book3s_hv_nested.c
@@ -767,8 +767,7 @@ pte_t *find_kvm_nested_guest_pte(struct kvm *kvm, unsigned long lpid,
if (!gp)
return NULL;
- VM_WARN(!spin_is_locked(&kvm->mmu_lock),
- "%s called with kvm mmu_lock not held \n", __func__);
+ kvm_mmu_lock_assert_held(kvm);
pte = __find_linux_pte(gp->shadow_pgtable, ea, NULL, hshift);
return pte;
diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index 7f599cc64178..cc8268cf28d2 100644
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -101,14 +101,14 @@ void kvm_flush_remote_tlbs_with_address(struct kvm *kvm,
static inline void kvm_mmu_get_root(struct kvm *kvm, struct kvm_mmu_page *sp)
{
BUG_ON(!sp->root_count);
- lockdep_assert_held(&kvm->mmu_lock);
+ kvm_mmu_lock_assert_held(kvm);
++sp->root_count;
}
static inline bool kvm_mmu_put_root(struct kvm *kvm, struct kvm_mmu_page *sp)
{
- lockdep_assert_held(&kvm->mmu_lock);
+ kvm_mmu_lock_assert_held(kvm);
--sp->root_count;
return !sp->root_count;
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index fb911ca428b2..1d7c01300495 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -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);
+ kvm_mmu_lock_assert_held(kvm);
WARN_ON(root->root_count);
WARN_ON(!root->tdp_mmu_page);
@@ -425,7 +425,7 @@ 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);
+ kvm_mmu_lock_assert_held(kvm);
WRITE_ONCE(*iter->sptep, new_spte);
@@ -1139,7 +1139,7 @@ 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);
+ kvm_mmu_lock_assert_held(kvm);
for_each_tdp_mmu_root(kvm, root) {
root_as_id = kvm_mmu_page_as_id(root);
if (root_as_id != slot->as_id)
@@ -1324,7 +1324,7 @@ bool kvm_tdp_mmu_write_protect_gfn(struct kvm *kvm,
int root_as_id;
bool spte_set = false;
- lockdep_assert_held(&kvm->mmu_lock);
+ kvm_mmu_lock_assert_held(kvm);
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/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 6e2773fc406c..022e3522788f 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1499,5 +1499,6 @@ void kvm_mmu_lock(struct kvm *kvm);
void kvm_mmu_unlock(struct kvm *kvm);
int kvm_mmu_lock_needbreak(struct kvm *kvm);
int kvm_mmu_lock_cond_resched(struct kvm *kvm);
+void kvm_mmu_lock_assert_held(struct kvm *kvm);
#endif
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index b4c49a7e0556..c504f876176b 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -452,6 +452,11 @@ int kvm_mmu_lock_cond_resched(struct kvm *kvm)
return cond_resched_lock(&kvm->mmu_lock);
}
+void kvm_mmu_lock_assert_held(struct kvm *kvm)
+{
+ lockdep_assert_held(&kvm->mmu_lock);
+}
+
#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
{
--
2.30.0.284.gd98b1dd5eaa7-goog
next prev parent reply other threads:[~2021-01-12 18:14 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-12 18:10 [PATCH 00/24] Allow parallel page faults with TDP MMU Ben Gardon
2021-01-12 18:10 ` [PATCH 01/24] locking/rwlocks: Add contention detection for rwlocks Ben Gardon
2021-01-12 18:10 ` [PATCH 02/24] sched: Add needbreak " Ben Gardon
2021-01-12 18:10 ` [PATCH 03/24] sched: Add cond_resched_rwlock Ben Gardon
2021-01-12 18:10 ` [PATCH 04/24] kvm: x86/mmu: change TDP MMU yield function returns to match cond_resched Ben Gardon
2021-01-20 18:38 ` Sean Christopherson
2021-01-21 20:22 ` Paolo Bonzini
2021-01-26 14:11 ` Paolo Bonzini
2021-01-12 18:10 ` [PATCH 05/24] kvm: x86/mmu: Fix yielding in TDP MMU Ben Gardon
2021-01-20 19:28 ` Sean Christopherson
2021-01-22 1:06 ` Ben Gardon
2021-01-12 18:10 ` [PATCH 06/24] kvm: x86/mmu: Skip no-op changes in TDP MMU functions Ben Gardon
2021-01-20 19:51 ` Sean Christopherson
2021-01-25 23:51 ` Ben Gardon
2021-01-12 18:10 ` [PATCH 07/24] kvm: x86/mmu: Add comment on __tdp_mmu_set_spte Ben Gardon
2021-01-26 14:13 ` Paolo Bonzini
2021-01-12 18:10 ` [PATCH 08/24] kvm: x86/mmu: Add lockdep when setting a TDP MMU SPTE Ben Gardon
2021-01-20 19:58 ` Sean Christopherson
2021-01-26 14:13 ` Paolo Bonzini
2021-01-12 18:10 ` [PATCH 09/24] kvm: x86/mmu: Don't redundantly clear TDP MMU pt memory Ben Gardon
2021-01-20 20:06 ` Sean Christopherson
2021-01-26 14:14 ` Paolo Bonzini
2021-01-12 18:10 ` [PATCH 10/24] kvm: x86/mmu: Factor out handle disconnected pt Ben Gardon
2021-01-20 20:30 ` Sean Christopherson
2021-01-26 14:14 ` Paolo Bonzini
2021-01-12 18:10 ` [PATCH 11/24] kvm: x86/mmu: Put TDP MMU PT walks in RCU read-critical section Ben Gardon
2021-01-20 22:19 ` Sean Christopherson
2021-01-12 18:10 ` [PATCH 12/24] kvm: x86/kvm: RCU dereference tdp mmu page table links Ben Gardon
2021-01-22 18:32 ` Sean Christopherson
2021-01-26 18:17 ` Ben Gardon
2021-01-12 18:10 ` [PATCH 13/24] kvm: x86/mmu: Only free tdp_mmu pages after a grace period Ben Gardon
2021-01-12 18:10 ` [PATCH 14/24] kvm: mmu: Wrap mmu_lock lock / unlock in a function Ben Gardon
2021-01-12 18:10 ` [PATCH 15/24] kvm: mmu: Wrap mmu_lock cond_resched and needbreak Ben Gardon
2021-01-21 0:19 ` Sean Christopherson
2021-01-21 20:17 ` Paolo Bonzini
2021-01-26 14:38 ` Paolo Bonzini
2021-01-26 17:47 ` Ben Gardon
2021-01-26 17:55 ` Paolo Bonzini
2021-01-26 18:11 ` Ben Gardon
2021-01-26 20:47 ` Paolo Bonzini
2021-01-27 20:08 ` Ben Gardon
2021-01-27 20:55 ` Paolo Bonzini
2021-01-27 21:20 ` Ben Gardon
2021-01-28 8:18 ` Paolo Bonzini
2021-01-12 18:10 ` Ben Gardon [this message]
2021-01-26 14:29 ` [PATCH 16/24] kvm: mmu: Wrap mmu_lock assertions Paolo Bonzini
2021-01-12 18:10 ` [PATCH 17/24] kvm: mmu: Move mmu_lock to struct kvm_arch Ben Gardon
2021-01-12 18:10 ` [PATCH 18/24] kvm: x86/mmu: Use an rwlock for the x86 TDP MMU Ben Gardon
2021-01-21 0:45 ` Sean Christopherson
2021-01-12 18:10 ` [PATCH 19/24] kvm: x86/mmu: Protect tdp_mmu_pages with a lock Ben Gardon
2021-01-21 19:22 ` Sean Christopherson
2021-01-21 21:32 ` Sean Christopherson
2021-01-26 14:27 ` Paolo Bonzini
2021-01-26 21:47 ` Ben Gardon
2021-01-26 22:02 ` Sean Christopherson
2021-01-26 22:09 ` Sean Christopherson
2021-01-27 12:40 ` Paolo Bonzini
2021-01-26 13:37 ` Paolo Bonzini
2021-01-26 21:07 ` Ben Gardon
2021-01-12 18:10 ` [PATCH 20/24] kvm: x86/mmu: Add atomic option for setting SPTEs Ben Gardon
2021-01-26 14:21 ` Paolo Bonzini
2021-01-12 18:10 ` [PATCH 21/24] kvm: x86/mmu: Use atomic ops to set SPTEs in TDP MMU map Ben Gardon
2021-01-12 18:10 ` [PATCH 22/24] kvm: x86/mmu: Flush TLBs after zap in TDP MMU PF handler Ben Gardon
2021-01-21 0:05 ` Sean Christopherson
2021-01-12 18:10 ` [PATCH 23/24] kvm: x86/mmu: Freeze SPTEs in disconnected pages Ben Gardon
2021-01-12 18:10 ` [PATCH 24/24] kvm: x86/mmu: Allow parallel page faults for the TDP MMU Ben Gardon
2021-01-21 0:55 ` Sean Christopherson
2021-01-26 21:57 ` Ben Gardon
2021-01-27 17:14 ` Sean Christopherson
2021-01-26 13:37 ` Paolo Bonzini
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