linux-kernel - [PATCH 1/2] hyperv: Sync guest VMM capabilities structure with Microsoft Hypervisor ABI

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Message-ID: 
 <176903495416.166619.16629695002971245203.stgit@skinsburskii-cloud-desktop.internal.cloudapp.net>
Date: Wed, 21 Jan 2026 22:35:54 +0000
From: Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>
To: kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
 decui@...rosoft.com, longli@...rosoft.com
Cc: linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] hyperv: Sync guest VMM capabilities structure with
 Microsoft Hypervisor ABI

From: Andreea Pintilie <anpintil@...rosoft.com>

Update the partition VMM capability structure to match the hypervisor
representation to bring it to the up to date state. A precursor patch for
Root-on-Core scheduler feature support.

Signed-off-by: Andreea Pintilie <anpintil@...rosoft.com>
Signed-off-by: Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>
---
 include/hyperv/hvhdk_mini.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/hyperv/hvhdk_mini.h b/include/hyperv/hvhdk_mini.h
index 41a29bf8ec14..aa03616f965b 100644
--- a/include/hyperv/hvhdk_mini.h
+++ b/include/hyperv/hvhdk_mini.h
@@ -102,7 +102,7 @@ enum hv_partition_property_code {
 };
 
 #define HV_PARTITION_VMM_CAPABILITIES_BANK_COUNT		1
-#define HV_PARTITION_VMM_CAPABILITIES_RESERVED_BITFIELD_COUNT	59
+#define HV_PARTITION_VMM_CAPABILITIES_RESERVED_BITFIELD_COUNT	58
 
 struct hv_partition_property_vmm_capabilities {
 	u16 bank_count;
@@ -119,6 +119,7 @@ struct hv_partition_property_vmm_capabilities {
 			u64 reservedbit3: 1;
 #endif
 			u64 assignable_synthetic_proc_features: 1;
+			u64 tag_hv_message_from_child: 1;
 			u64 reserved0: HV_PARTITION_VMM_CAPABILITIES_RESERVED_BITFIELD_COUNT;
 		} __packed;
 	};