Merge tag 'kvm-x86-generic-6.4' of https://github.com/kvm-x86/linux into HEAD

Common KVM changes for 6.4:

 - Drop unnecessary casts from "void *" throughout kvm_main.c

 - Tweak the layout of "struct kvm_mmu_memory_cache" to shrink the struct
   size by 8 bytes on 64-bit kernels by utilizing a padding hole

 - Fix a documentation format goof that was introduced when the KVM docs
   were converted to ReST

 - Constify MIPS's internal callbacks (a leftover from the hardware enabling
   rework that landed in 6.3)

Author: bonzini

Documentation/virt/kvm/api.rst

@@ -7330,6 +7330,7 @@ and injected exceptions.
        will clear DR6.RTM.
 
 7.18 KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2
+--------------------------------------
 
 :Architectures: x86, arm64, mips
 :Parameters: args[0] whether feature should be enabled or not

Documentation/virt/kvm/locking.rst

@@ -21,7 +21,7 @@ The acquisition orders for mutexes are as follows:
 - kvm->mn_active_invalidate_count ensures that pairs of
   invalidate_range_start() and invalidate_range_end() callbacks
   use the same memslots array.  kvm->slots_lock and kvm->slots_arch_lock
-  are taken on the waiting side in install_new_memslots, so MMU notifiers
+  are taken on the waiting side when modifying memslots, so MMU notifiers
   must not take either kvm->slots_lock or kvm->slots_arch_lock.
 
 For SRCU:

arch/mips/include/asm/kvm_host.h

@@ -757,7 +757,7 @@ struct kvm_mips_callbacks {
 	int (*vcpu_run)(struct kvm_vcpu *vcpu);
 	void (*vcpu_reenter)(struct kvm_vcpu *vcpu);
 };
-extern struct kvm_mips_callbacks *kvm_mips_callbacks;
+extern const struct kvm_mips_callbacks * const kvm_mips_callbacks;
 int kvm_mips_emulation_init(void);
 
 /* Debug: dump vcpu state */

arch/mips/kvm/vz.c

@@ -3305,7 +3305,7 @@ static struct kvm_mips_callbacks kvm_vz_callbacks = {
 };
 
 /* FIXME: Get rid of the callbacks now that trap-and-emulate is gone. */
-struct kvm_mips_callbacks *kvm_mips_callbacks = &kvm_vz_callbacks;
+const struct kvm_mips_callbacks * const kvm_mips_callbacks = &kvm_vz_callbacks;
 
 int kvm_mips_emulation_init(void)
 {

include/linux/kvm_host.h

@@ -58,7 +58,7 @@
 
 /*
  * Bit 63 of the memslot generation number is an "update in-progress flag",
- * e.g. is temporarily set for the duration of install_new_memslots().
+ * e.g. is temporarily set for the duration of kvm_swap_active_memslots().
  * This flag effectively creates a unique generation number that is used to
  * mark cached memslot data, e.g. MMIO accesses, as potentially being stale,
  * i.e. may (or may not) have come from the previous memslots generation.
@@ -713,7 +713,7 @@ struct kvm {
 	 * use by the VM. To be used under the slots_lock (above) or in a
 	 * kvm->srcu critical section where acquiring the slots_lock would
 	 * lead to deadlock with the synchronize_srcu in
-	 * install_new_memslots.
+	 * kvm_swap_active_memslots().
 	 */
 	struct mutex slots_arch_lock;
 	struct mm_struct *mm; /* userspace tied to this vm */

include/linux/kvm_types.h

@@ -91,11 +91,11 @@ struct gfn_to_pfn_cache {
  * is topped up (__kvm_mmu_topup_memory_cache()).
  */
 struct kvm_mmu_memory_cache {
-	int nobjs;
 	gfp_t gfp_zero;
 	gfp_t gfp_custom;
 	struct kmem_cache *kmem_cache;
 	int capacity;
+	int nobjs;
 	void **objects;
 };
 #endif

virt/kvm/kvm_main.c

@@ -1298,7 +1298,7 @@ static void kvm_destroy_vm(struct kvm *kvm)
 	 * At this point, pending calls to invalidate_range_start()
 	 * have completed but no more MMU notifiers will run, so
 	 * mn_active_invalidate_count may remain unbalanced.
-	 * No threads can be waiting in install_new_memslots as the
+	 * No threads can be waiting in kvm_swap_active_memslots() as the
 	 * last reference on KVM has been dropped, but freeing
 	 * memslots would deadlock without this manual intervention.
 	 */
@@ -1742,13 +1742,13 @@ static void kvm_invalidate_memslot(struct kvm *kvm,
 	kvm_arch_flush_shadow_memslot(kvm, old);
 	kvm_arch_guest_memory_reclaimed(kvm);
 
-	/* Was released by kvm_swap_active_memslots, reacquire. */
+	/* Was released by kvm_swap_active_memslots(), reacquire. */
 	mutex_lock(&kvm->slots_arch_lock);
 
 	/*
 	 * Copy the arch-specific field of the newly-installed slot back to the
 	 * old slot as the arch data could have changed between releasing
-	 * slots_arch_lock in install_new_memslots() and re-acquiring the lock
+	 * slots_arch_lock in kvm_swap_active_memslots() and re-acquiring the lock
 	 * above.  Writers are required to retrieve memslots *after* acquiring
 	 * slots_arch_lock, thus the active slot's data is guaranteed to be fresh.
 	 */
@@ -1810,11 +1810,11 @@ static int kvm_set_memslot(struct kvm *kvm,
 	int r;
 
 	/*
-	 * Released in kvm_swap_active_memslots.
+	 * Released in kvm_swap_active_memslots().
 	 *
-	 * Must be held from before the current memslots are copied until
-	 * after the new memslots are installed with rcu_assign_pointer,
-	 * then released before the synchronize srcu in kvm_swap_active_memslots.
+	 * Must be held from before the current memslots are copied until after
+	 * the new memslots are installed with rcu_assign_pointer, then
+	 * released before the synchronize srcu in kvm_swap_active_memslots().
 	 *
 	 * When modifying memslots outside of the slots_lock, must be held
 	 * before reading the pointer to the current memslots until after all
@@ -3866,7 +3866,7 @@ static int create_vcpu_fd(struct kvm_vcpu *vcpu)
 #ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS
 static int vcpu_get_pid(void *data, u64 *val)
 {
-	struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
+	struct kvm_vcpu *vcpu = data;
 	*val = pid_nr(rcu_access_pointer(vcpu->pid));
 	return 0;
 }
@@ -5572,8 +5572,7 @@ static int kvm_debugfs_open(struct inode *inode, struct file *file,
 			   const char *fmt)
 {
 	int ret;
-	struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
-					  inode->i_private;
+	struct kvm_stat_data *stat_data = inode->i_private;
 
 	/*
 	 * The debugfs files are a reference to the kvm struct which
@@ -5594,8 +5593,7 @@ static int kvm_debugfs_open(struct inode *inode, struct file *file,
 
 static int kvm_debugfs_release(struct inode *inode, struct file *file)
 {
-	struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
-					  inode->i_private;
+	struct kvm_stat_data *stat_data = inode->i_private;
 
 	simple_attr_release(inode, file);
 	kvm_put_kvm(stat_data->kvm);
@@ -5644,7 +5642,7 @@ static int kvm_clear_stat_per_vcpu(struct kvm *kvm, size_t offset)
 static int kvm_stat_data_get(void *data, u64 *val)
 {
 	int r = -EFAULT;
-	struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
+	struct kvm_stat_data *stat_data = data;
 
 	switch (stat_data->kind) {
 	case KVM_STAT_VM:
@@ -5663,7 +5661,7 @@ static int kvm_stat_data_get(void *data, u64 *val)
 static int kvm_stat_data_clear(void *data, u64 val)
 {
 	int r = -EFAULT;
-	struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
+	struct kvm_stat_data *stat_data = data;
 
 	if (val)
 		return -EINVAL;