If this CAP returns true, then guestmem_hugetlb can be used as a
custom allocator for guest_memfd.
Change-Id: I4edef395b5bd5814b70c81788d87aa94823c35d5
Signed-off-by: Ackerley Tng <ackerleytng@xxxxxxxxxx>
---
include/uapi/linux/kvm.h | 1 +
virt/kvm/kvm_main.c | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index af486b2e4862..5012343dc2c5 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -932,6 +932,7 @@ struct kvm_enable_cap {
#define KVM_CAP_ARM_WRITABLE_IMP_ID_REGS 239
#define KVM_CAP_GMEM_SHARED_MEM 240
#define KVM_CAP_GMEM_CONVERSION 241
+#define KVM_CAP_GMEM_HUGETLB 242
struct kvm_irq_routing_irqchip {
__u32 irqchip;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 92054b1bbd3f..230bcb853712 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -4845,6 +4845,10 @@ static int kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
case KVM_CAP_GMEM_SHARED_MEM:
case KVM_CAP_GMEM_CONVERSION:
return true;
+#endif
+#ifdef CONFIG_KVM_GMEM_HUGETLB
+ case KVM_CAP_GMEM_HUGETLB:
+ return true;
#endif
default:
break;
--
2.49.0.1045.g170613ef41-goog
