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mshv: Add SMT_ENABLED_GUEST partition creation flag

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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: Anatol Belski <anbelski@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Anatol Belski 2026-02-18 14:48:02 +00:00 • committed by Wei Liu
parent a284dbc96a
commit 8927a108a7
3 changed files with 4 additions and 0 deletions
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2
drivers/hv/mshv_root_main.c
View file

@ -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;

1
include/hyperv/hvhdk.h
View file

@ -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)

1
include/uapi/linux/mshv.h
View file

@ -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,
};