mshv: Add support for a new parent partition configuration

Detect booting as an "L1VH" partition. This is a new scenario very
similar to root partition where the mshv_root driver can be used to
create and manage guest partitions.

It mostly works the same as root partition, but there are some
differences in how various features are handled. hv_l1vh_partition()
is introduced to handle these cases. Add hv_parent_partition()
which returns true for either case, replacing some hv_root_partition()
checks.

Signed-off-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Acked-by: Wei Liu <wei.liu@kernel.org>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index a729b77983fa..dbd4c2f3aee3 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -31,6 +31,7 @@
 enum hv_partition_type {
 	HV_PARTITION_TYPE_GUEST,
 	HV_PARTITION_TYPE_ROOT,
+	HV_PARTITION_TYPE_L1VH,
 };
 
 struct ms_hyperv_info {
@@ -354,12 +355,22 @@ static inline bool hv_root_partition(void)
 {
 	return hv_curr_partition_type == HV_PARTITION_TYPE_ROOT;
 }
+static inline bool hv_l1vh_partition(void)
+{
+	return hv_curr_partition_type == HV_PARTITION_TYPE_L1VH;
+}
+static inline bool hv_parent_partition(void)
+{
+	return hv_root_partition() || hv_l1vh_partition();
+}
 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
 
 #else /* CONFIG_MSHV_ROOT */
 static inline bool hv_root_partition(void) { return false; }
+static inline bool hv_l1vh_partition(void) { return false; }
+static inline bool hv_parent_partition(void) { return false; }
 static inline int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages)
 {
 	return -EOPNOTSUPP;