linux-kernel - [PATCH v3 3/4] mshv: Handle insufficient contiguous memory hypervisor status

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Message-ID: 
 <177031694144.186911.9296387721615544854.stgit@skinsburskii-cloud-desktop.internal.cloudapp.net>
Date: Thu, 05 Feb 2026 18:42:21 +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 v3 3/4] mshv: Handle insufficient contiguous memory hypervisor
 status

The HV_STATUS_INSUFFICIENT_CONTIGUOUS_MEMORY status indicates that the
hypervisor lacks sufficient contiguous memory for its internal allocations.

When this status is encountered, allocate and deposit
HV_MAX_CONTIGUOUS_ALLOCATION_PAGES contiguous pages to the hypervisor.
HV_MAX_CONTIGUOUS_ALLOCATION_PAGES is defined in the hypervisor headers, a
deposit of this size will always satisfy the hypervisor's requirements.

Signed-off-by: Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>
---
 drivers/hv/hv_common.c      |    1 +
 drivers/hv/hv_proc.c        |    4 ++++
 include/hyperv/hvgdk_mini.h |    1 +
 include/hyperv/hvhdk_mini.h |    2 ++
 4 files changed, 8 insertions(+)

diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index f1c17fb60dc1..f20596276662 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -793,6 +793,7 @@ static const struct hv_status_info hv_status_infos[] = {
 	_STATUS_INFO(HV_STATUS_UNKNOWN_PROPERTY,		-EIO),
 	_STATUS_INFO(HV_STATUS_PROPERTY_VALUE_OUT_OF_RANGE,	-EIO),
 	_STATUS_INFO(HV_STATUS_INSUFFICIENT_MEMORY,		-ENOMEM),
+	_STATUS_INFO(HV_STATUS_INSUFFICIENT_CONTIGUOUS_MEMORY,	-ENOMEM),
 	_STATUS_INFO(HV_STATUS_INVALID_PARTITION_ID,		-EINVAL),
 	_STATUS_INFO(HV_STATUS_INVALID_VP_INDEX,		-EINVAL),
 	_STATUS_INFO(HV_STATUS_NOT_FOUND,			-EIO),
diff --git a/drivers/hv/hv_proc.c b/drivers/hv/hv_proc.c
index 53622e5886b8..181f6d02bce3 100644
--- a/drivers/hv/hv_proc.c
+++ b/drivers/hv/hv_proc.c
@@ -118,6 +118,9 @@ int hv_deposit_memory_node(int node, u64 partition_id,
 	switch (hv_result(hv_status)) {
 	case HV_STATUS_INSUFFICIENT_MEMORY:
 		break;
+	case HV_STATUS_INSUFFICIENT_CONTIGUOUS_MEMORY:
+		num_pages = HV_MAX_CONTIGUOUS_ALLOCATION_PAGES;
+		break;
 	default:
 		hv_status_err(hv_status, "Unexpected!\n");
 		return -ENOMEM;
@@ -130,6 +133,7 @@ bool hv_result_needs_memory(u64 status)
 {
 	switch (hv_result(status)) {
 	case HV_STATUS_INSUFFICIENT_MEMORY:
+	case HV_STATUS_INSUFFICIENT_CONTIGUOUS_MEMORY:
 		return true;
 	}
 	return false;
diff --git a/include/hyperv/hvgdk_mini.h b/include/hyperv/hvgdk_mini.h
index 30fbbde81c5c..99ea0d03e657 100644
--- a/include/hyperv/hvgdk_mini.h
+++ b/include/hyperv/hvgdk_mini.h
@@ -38,6 +38,7 @@ struct hv_u128 {
 #define HV_STATUS_INVALID_LP_INDEX		    0x41
 #define HV_STATUS_INVALID_REGISTER_VALUE	    0x50
 #define HV_STATUS_OPERATION_FAILED		    0x71
+#define HV_STATUS_INSUFFICIENT_CONTIGUOUS_MEMORY    0x75
 #define HV_STATUS_TIME_OUT			    0x78
 #define HV_STATUS_CALL_PENDING			    0x79
 #define HV_STATUS_VTL_ALREADY_ENABLED		    0x86
diff --git a/include/hyperv/hvhdk_mini.h b/include/hyperv/hvhdk_mini.h
index c0300910808b..091c03e26046 100644
--- a/include/hyperv/hvhdk_mini.h
+++ b/include/hyperv/hvhdk_mini.h
@@ -7,6 +7,8 @@
 
 #include "hvgdk_mini.h"
 
+#define HV_MAX_CONTIGUOUS_ALLOCATION_PAGES	8
+
 /*
  * Doorbell connection_info flags.
  */