[PATCH v5 05/19] KVM: x86: Allocate memslot resources during prepare_memory_region()

Sean Christopherson
2020-01-21T22:33:43Z

Allocate the various metadata structures associated with a new memslot
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.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/kvm/x86.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1953c71c52f2..35a7e3d9b99a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9790,6 +9790,12 @@ 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_alloc_memslot_metadata(struct kvm_memory_slot *slot,
+ unsigned long npages)
{
int i;

@@ -9874,10 +9880,9 @@ 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_MOVE)
- return kvm_arch_create_memslot(kvm, memslot,
- mem->memory_size >> PAGE_SHIFT);
-
+ if (change == KVM_MR_CREATE || change == KVM_MR_MOVE)
+ return kvm_alloc_memslot_metadata(memslot,
+ mem->memory_size >> PAGE_SHIFT);
return 0;
}

--
2.24.1