From 8927a108a7662eb83eb667bc0c5a0633397122b1 Mon Sep 17 00:00:00 2001 From: Anatol Belski Date: Wed, 18 Feb 2026 14:48:02 +0000 Subject: 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: Anatol Belski Signed-off-by: Wei Liu --- include/hyperv/hvhdk.h | 1 + include/uapi/linux/mshv.h | 1 + 2 files changed, 2 insertions(+) (limited to 'include') diff --git a/include/hyperv/hvhdk.h b/include/hyperv/hvhdk.h index f139c7c5bb2d..245f3db53bf1 100644 --- a/include/hyperv/hvhdk.h +++ b/include/hyperv/hvhdk.h @@ -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) diff --git a/include/uapi/linux/mshv.h b/include/uapi/linux/mshv.h index 7ef5dd67a232..e0645a34b55b 100644 --- a/include/uapi/linux/mshv.h +++ b/include/uapi/linux/mshv.h @@ -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, }; -- cgit v1.2.3