kvmtool: Abstract KVM_VM_TYPE into a weak function
Most architectures pass a fixed value for their VM type. However,
arm64 uses it as a parameter describing the size of the guest's
physical address space.
In order to support this, introduce a kvm__get_vm_type() helper
that only returns KVM_VM_TYPE for now.
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Oliver Upton <oupton@google.com>
Link: https://lore.kernel.org/r/20210822152526.1291918-2-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
diff --git a/include/kvm/kvm.h b/include/kvm/kvm.h
index 56e9c8e..ad732e5 100644
--- a/include/kvm/kvm.h
+++ b/include/kvm/kvm.h
@@ -114,6 +114,7 @@
struct kvm *kvm__new(void);
int kvm__recommended_cpus(struct kvm *kvm);
int kvm__max_cpus(struct kvm *kvm);
+int kvm__get_vm_type(struct kvm *kvm);
void kvm__init_ram(struct kvm *kvm);
int kvm__exit(struct kvm *kvm);
bool kvm__load_firmware(struct kvm *kvm, const char *firmware_filename);
diff --git a/kvm.c b/kvm.c
index e327541..5bc66c8 100644
--- a/kvm.c
+++ b/kvm.c
@@ -428,6 +428,11 @@
return ret;
}
+int __attribute__((weak)) kvm__get_vm_type(struct kvm *kvm)
+{
+ return KVM_VM_TYPE;
+}
+
int kvm__init(struct kvm *kvm)
{
int ret;
@@ -461,7 +466,7 @@
goto err_sys_fd;
}
- kvm->vm_fd = ioctl(kvm->sys_fd, KVM_CREATE_VM, KVM_VM_TYPE);
+ kvm->vm_fd = ioctl(kvm->sys_fd, KVM_CREATE_VM, kvm__get_vm_type(kvm));
if (kvm->vm_fd < 0) {
pr_err("KVM_CREATE_VM ioctl");
ret = kvm->vm_fd;
