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mshv: Introduce hv_deposit_memory helper functions

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Introduce hv_deposit_memory_node() and hv_deposit_memory() helper
functions to handle memory deposit with proper error handling.

The new hv_deposit_memory_node() function takes the hypervisor status
as a parameter and validates it before depositing pages. It checks for
HV_STATUS_INSUFFICIENT_MEMORY specifically and returns an error for
unexpected status codes.

This is a precursor patch to new out-of-memory error codes support.
No functional changes intended.

Signed-off-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Reviewed-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
Reviewed-by: Mukesh R <mrathor@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Stanislav Kinsburskii 2026-02-05 18:42:15 +00:00 • committed by Wei Liu
parent 7db44aa173
commit ede54383e6
4 changed files with 39 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

21
drivers/hv/hv_proc.c
View file

@ -110,6 +110,22 @@ free_buf:
}
EXPORT_SYMBOL_GPL(hv_call_deposit_pages);
int hv_deposit_memory_node(int node, u64 partition_id,
u64 hv_status)
{
u32 num_pages = 1;
switch (hv_result(hv_status)) {
case HV_STATUS_INSUFFICIENT_MEMORY:
break;
default:
hv_status_err(hv_status, "Unexpected!\n");
return -ENOMEM;
}
return hv_call_deposit_pages(node, partition_id, num_pages);
}
EXPORT_SYMBOL_GPL(hv_deposit_memory_node);
bool hv_result_needs_memory(u64 status)
{
switch (hv_result(status)) {
@ -155,7 +171,8 @@ int hv_call_add_logical_proc(int node, u32 lp_index, u32 apic_id)
}
break;
}
ret = hv_call_deposit_pages(node, hv_current_partition_id, 1);
ret = hv_deposit_memory_node(node, hv_current_partition_id,
status);
} while (!ret);
return ret;
@ -197,7 +214,7 @@ int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags)
}
break;
}
ret = hv_call_deposit_pages(node, partition_id, 1);
ret = hv_deposit_memory_node(node, partition_id, status);
} while (!ret);

25
drivers/hv/mshv_root_hv_call.c
View file

@ -123,8 +123,7 @@ int hv_call_create_partition(u64 flags,
break;
}
local_irq_restore(irq_flags);
ret = hv_call_deposit_pages(NUMA_NO_NODE,
hv_current_partition_id, 1);
ret = hv_deposit_memory(hv_current_partition_id, status);
} while (!ret);
return ret;
@ -151,7 +150,7 @@ int hv_call_initialize_partition(u64 partition_id)
ret = hv_result_to_errno(status);
break;
}
ret = hv_call_deposit_pages(NUMA_NO_NODE, partition_id, 1);
ret = hv_deposit_memory(partition_id, status);
} while (!ret);
return ret;
@ -465,8 +464,7 @@ int hv_call_get_vp_state(u32 vp_index, u64 partition_id,
}
local_irq_restore(flags);
ret = hv_call_deposit_pages(NUMA_NO_NODE,
partition_id, 1);
ret = hv_deposit_memory(partition_id, status);
} while (!ret);
return ret;
@ -525,8 +523,7 @@ int hv_call_set_vp_state(u32 vp_index, u64 partition_id,
}
local_irq_restore(flags);
ret = hv_call_deposit_pages(NUMA_NO_NODE,
partition_id, 1);
ret = hv_deposit_memory(partition_id, status);
} while (!ret);
return ret;
@ -573,7 +570,7 @@ static int hv_call_map_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
local_irq_restore(flags);
ret = hv_call_deposit_pages(NUMA_NO_NODE, partition_id, 1);
ret = hv_deposit_memory(partition_id, status);
} while (!ret);
return ret;
@ -722,8 +719,7 @@ hv_call_create_port(u64 port_partition_id, union hv_port_id port_id,
ret = hv_result_to_errno(status);
break;
}
ret = hv_call_deposit_pages(NUMA_NO_NODE, port_partition_id, 1);
ret = hv_deposit_memory(port_partition_id, status);
} while (!ret);
return ret;
@ -776,8 +772,7 @@ hv_call_connect_port(u64 port_partition_id, union hv_port_id port_id,
ret = hv_result_to_errno(status);
break;
}
ret = hv_call_deposit_pages(NUMA_NO_NODE,
connection_partition_id, 1);
ret = hv_deposit_memory(connection_partition_id, status);
} while (!ret);
return ret;
@ -855,8 +850,7 @@ static int hv_call_map_stats_page2(enum hv_stats_object_type type,
break;
}
ret = hv_call_deposit_pages(NUMA_NO_NODE,
hv_current_partition_id, 1);
ret = hv_deposit_memory(hv_current_partition_id, status);
} while (!ret);
return ret;
@ -929,8 +923,7 @@ hv_call_map_stats_page(enum hv_stats_object_type type,
return hv_result_to_errno(status);
}
ret = hv_call_deposit_pages(NUMA_NO_NODE,
hv_current_partition_id, 1);
ret = hv_deposit_memory(hv_current_partition_id, status);
if (ret)
return ret;
} while (!ret);

3
drivers/hv/mshv_root_main.c
View file

@ -255,8 +255,7 @@ static int mshv_ioctl_passthru_hvcall(struct mshv_partition *partition,
if (!hv_result_needs_memory(status))
ret = hv_result_to_errno(status);
else
ret = hv_call_deposit_pages(NUMA_NO_NODE,
pt_id, 1);
ret = hv_deposit_memory(pt_id, status);
} while (!ret);
args.status = hv_result(status);

10
include/asm-generic/mshyperv.h
View file

@ -344,6 +344,7 @@ static inline bool hv_parent_partition(void)
}
bool hv_result_needs_memory(u64 status);
int hv_deposit_memory_node(int node, u64 partition_id, u64 status);
int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
@ -353,6 +354,10 @@ static inline bool hv_root_partition(void) { return false; }
static inline bool hv_l1vh_partition(void) { return false; }
static inline bool hv_parent_partition(void) { return false; }
static inline bool hv_result_needs_memory(u64 status) { return false; }
static inline int hv_deposit_memory_node(int node, u64 partition_id, u64 status)
{
return -EOPNOTSUPP;
}
static inline int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages)
{
return -EOPNOTSUPP;
@ -367,6 +372,11 @@ static inline int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u3
}
#endif /* CONFIG_MSHV_ROOT */
static inline int hv_deposit_memory(u64 partition_id, u64 status)
{
return hv_deposit_memory_node(NUMA_NO_NODE, partition_id, status);
}
#if IS_ENABLED(CONFIG_HYPERV_VTL_MODE)
u8 __init get_vtl(void);
#else