KVM: Add parameter "kvm" to kvm_cpu_dirty_log_size() and its callers

Add a parameter "kvm" to kvm_cpu_dirty_log_size() and down to its callers:
kvm_dirty_ring_get_rsvd_entries(), kvm_dirty_ring_alloc().

This is a preparation to make cpu_dirty_log_size a per-VM value rather than
a system-wide value.

No function changes expected.

Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Author: yanzhao56

arch/x86/kvm/mmu/mmu.c

@@ -1311,7 +1311,7 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
 		kvm_mmu_write_protect_pt_masked(kvm, slot, gfn_offset, mask);
 }
 
-int kvm_cpu_dirty_log_size(void)
+int kvm_cpu_dirty_log_size(struct kvm *kvm)
 {
 	return kvm_x86_ops.cpu_dirty_log_size;
 }

include/linux/kvm_dirty_ring.h

@@ -32,7 +32,7 @@ struct kvm_dirty_ring {
  * If CONFIG_HAVE_HVM_DIRTY_RING not defined, kvm_dirty_ring.o should
  * not be included as well, so define these nop functions for the arch.
  */
-static inline u32 kvm_dirty_ring_get_rsvd_entries(void)
+static inline u32 kvm_dirty_ring_get_rsvd_entries(struct kvm *kvm)
 {
 	return 0;
 }
@@ -42,7 +42,7 @@ static inline bool kvm_use_dirty_bitmap(struct kvm *kvm)
 	return true;
 }
 
-static inline int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring,
+static inline int kvm_dirty_ring_alloc(struct kvm *kvm, struct kvm_dirty_ring *ring,
 				       int index, u32 size)
 {
 	return 0;
@@ -71,11 +71,12 @@ static inline void kvm_dirty_ring_free(struct kvm_dirty_ring *ring)
 
 #else /* CONFIG_HAVE_KVM_DIRTY_RING */
 
-int kvm_cpu_dirty_log_size(void);
+int kvm_cpu_dirty_log_size(struct kvm *kvm);
 bool kvm_use_dirty_bitmap(struct kvm *kvm);
 bool kvm_arch_allow_write_without_running_vcpu(struct kvm *kvm);
-u32 kvm_dirty_ring_get_rsvd_entries(void);
-int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, int index, u32 size);
+u32 kvm_dirty_ring_get_rsvd_entries(struct kvm *kvm);
+int kvm_dirty_ring_alloc(struct kvm *kvm, struct kvm_dirty_ring *ring,
+			 int index, u32 size);
 
 /*
  * called with kvm->slots_lock held, returns the number of

virt/kvm/dirty_ring.c

@@ -11,14 +11,14 @@
 #include <trace/events/kvm.h>
 #include "kvm_mm.h"
 
-int __weak kvm_cpu_dirty_log_size(void)
+int __weak kvm_cpu_dirty_log_size(struct kvm *kvm)
 {
 	return 0;
 }
 
-u32 kvm_dirty_ring_get_rsvd_entries(void)
+u32 kvm_dirty_ring_get_rsvd_entries(struct kvm *kvm)
 {
-	return KVM_DIRTY_RING_RSVD_ENTRIES + kvm_cpu_dirty_log_size();
+	return KVM_DIRTY_RING_RSVD_ENTRIES + kvm_cpu_dirty_log_size(kvm);
 }
 
 bool kvm_use_dirty_bitmap(struct kvm *kvm)
@@ -74,14 +74,15 @@ static void kvm_reset_dirty_gfn(struct kvm *kvm, u32 slot, u64 offset, u64 mask)
 	KVM_MMU_UNLOCK(kvm);
 }
 
-int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, int index, u32 size)
+int kvm_dirty_ring_alloc(struct kvm *kvm, struct kvm_dirty_ring *ring,
+			 int index, u32 size)
 {
 	ring->dirty_gfns = vzalloc(size);
 	if (!ring->dirty_gfns)
 		return -ENOMEM;
 
 	ring->size = size / sizeof(struct kvm_dirty_gfn);
-	ring->soft_limit = ring->size - kvm_dirty_ring_get_rsvd_entries();
+	ring->soft_limit = ring->size - kvm_dirty_ring_get_rsvd_entries(kvm);
 	ring->dirty_index = 0;
 	ring->reset_index = 0;
 	ring->index = index;

virt/kvm/kvm_main.c

@@ -4108,7 +4108,7 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, unsigned long id)
 		goto vcpu_free_run_page;
 
 	if (kvm->dirty_ring_size) {
-		r = kvm_dirty_ring_alloc(&vcpu->dirty_ring,
+		r = kvm_dirty_ring_alloc(kvm, &vcpu->dirty_ring,
 					 id, kvm->dirty_ring_size);
 		if (r)
 			goto arch_vcpu_destroy;
@@ -4847,7 +4847,7 @@ static int kvm_vm_ioctl_enable_dirty_log_ring(struct kvm *kvm, u32 size)
 		return -EINVAL;
 
 	/* Should be bigger to keep the reserved entries, or a page */
-	if (size < kvm_dirty_ring_get_rsvd_entries() *
+	if (size < kvm_dirty_ring_get_rsvd_entries(kvm) *
 	    sizeof(struct kvm_dirty_gfn) || size < PAGE_SIZE)
 		return -EINVAL;