[PATCH v7 10/29] KVM: x86: Use "new" memslot instead of userspace memory region

[Maciej S. Szmigiero]

From: Sean Christopherson <seanjc@xxxxxxxxxx>

Get the number of pages directly from the new memslot instead of
computing the same from the userspace memory region when allocating
memslot metadata.  This will allow a future patch to drop @mem.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Reviewed-by: Maciej S. Szmigiero <maciej.szmigiero@xxxxxxxxxx>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@xxxxxxxxxx>
---
 arch/x86/kvm/x86.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d6362406a82e..e657c238b642 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11642,9 +11642,9 @@ int memslot_rmap_alloc(struct kvm_memory_slot *slot, unsigned long npages)
 }
 
 static int kvm_alloc_memslot_metadata(struct kvm *kvm,
-				      struct kvm_memory_slot *slot,
-				      unsigned long npages)
+				      struct kvm_memory_slot *slot)
 {
+	unsigned long npages = slot->npages;
 	int i, r;
 
 	/*
@@ -11729,8 +11729,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
 				   enum kvm_mr_change change)
 {
 	if (change == KVM_MR_CREATE || change == KVM_MR_MOVE)
-		return kvm_alloc_memslot_metadata(kvm, new,
-						  mem->memory_size >> PAGE_SHIFT);
+		return kvm_alloc_memslot_metadata(kvm, new);
 
 	if (change == KVM_MR_FLAGS_ONLY)
 		memcpy(&new->arch, &old->arch, sizeof(old->arch));