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[03/13] KVM: x86: Allocate memslot resources during prepare_memory_region()

Message ID 20190911185038.24341-4-sean.j.christopherson@intel.com (mailing list archive)
State New, archived
Headers show
Series KVM: Dynamically size memslot arrays | expand

Commit Message

Sean Christopherson Sept. 11, 2019, 6:50 p.m. UTC 
Allocate the various metadata structures associated with a memslot
during during kvm_arch_prepare_memory_region(), which paves the way for
removing kvm_arch_create_memslot() altogether.  Moving x86's memory
allocation only changes the order of kernel memory allocations between
x86 and common KVM code.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/x86.c | 9 +++++++++
 1 file changed, 9 insertions(+)
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Patch

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b4cfd786d0b6..72ec6272d7cb 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9484,6 +9484,12 @@  void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
 
 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
 			    unsigned long npages)
+{
+	return 0;
+}
+
+static int kvm_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
+			      unsigned long npages)
 {
 	int i;
 
@@ -9561,6 +9567,9 @@  int kvm_arch_prepare_memory_region(struct kvm *kvm,
 				const struct kvm_userspace_memory_region *mem,
 				enum kvm_mr_change change)
 {
+	if (change == KVM_MR_CREATE)
+		return kvm_create_memslot(kvm, memslot,
+					  mem->memory_size >> PAGE_SHIFT);
 	return 0;
 }