Commit 8927a108 authored by Anatol Belski's avatar Anatol Belski Committed by Wei Liu
Browse files

mshv: Add SMT_ENABLED_GUEST partition creation flag 



Add support for HV_PARTITION_CREATION_FLAG_SMT_ENABLED_GUEST
to allow userspace VMMs to enable SMT for guest partitions.

Expose this via new MSHV_PT_BIT_SMT_ENABLED_GUEST flag in the UAPI.

Without this flag, the hypervisor schedules guest VPs incorrectly,
causing SMT unusable.

Signed-off-by: default avatarAnatol Belski <anbelski@linux.microsoft.com>
Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
parent a284dbc9

drivers/hv/mshv_root_main.c

+2 −0
Original line number Diff line number Diff line
@@ -1949,6 +1949,8 @@ static long mshv_ioctl_process_pt_flags(void __user *user_arg, u64 *pt_flags, 
		*pt_flags |= HV_PARTITION_CREATION_FLAG_GPA_SUPER_PAGES_ENABLED;

	if (args.pt_flags & BIT(MSHV_PT_BIT_NESTED_VIRTUALIZATION))

		*pt_flags |= HV_PARTITION_CREATION_FLAG_NESTED_VIRTUALIZATION_CAPABLE;

	if (args.pt_flags & BIT(MSHV_PT_BIT_SMT_ENABLED_GUEST))

		*pt_flags |= HV_PARTITION_CREATION_FLAG_SMT_ENABLED_GUEST;



	isol_props->as_uint64 = 0;

include/hyperv/hvhdk.h

+1 −0
Original line number Diff line number Diff line
@@ -335,6 +335,7 @@ union hv_partition_isolation_properties { 
#define HV_PARTITION_ISOLATION_HOST_TYPE_RESERVED   0x2



/* Note: Exo partition is enabled by default */

#define HV_PARTITION_CREATION_FLAG_SMT_ENABLED_GUEST			BIT(0)

#define HV_PARTITION_CREATION_FLAG_NESTED_VIRTUALIZATION_CAPABLE	BIT(1)

#define HV_PARTITION_CREATION_FLAG_GPA_SUPER_PAGES_ENABLED		BIT(4)

#define HV_PARTITION_CREATION_FLAG_EXO_PARTITION			BIT(8)

include/uapi/linux/mshv.h

+1 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ enum { 
	MSHV_PT_BIT_GPA_SUPER_PAGES,

	MSHV_PT_BIT_CPU_AND_XSAVE_FEATURES,

	MSHV_PT_BIT_NESTED_VIRTUALIZATION,

	MSHV_PT_BIT_SMT_ENABLED_GUEST,

	MSHV_PT_BIT_COUNT,

};