[PATCH v3 06/15] hyperv-tlfs: Introduce hv_status_to_string and hv_status_to_errno

Nuno Das Neves
2023-09-22T18:39:23Z

hv_status_to_errno translates hyperv statuses to linux error codes.
This is useful for returning something linux-friendly from a hypercall
helper function.

hv_status_to_string improves clarity of error messages.

Signed-off-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Acked-by: Wei Liu <wei.liu@kernel.org>
---
arch/x86/hyperv/hv_init.c | 2 +-
arch/x86/hyperv/hv_proc.c | 6 ++--
include/asm-generic/hyperv-tlfs.h | 47 ++++++++++++++++++++++---------
include/asm-generic/mshyperv.h | 33 ++++++++++++++++++++++
4 files changed, 71 insertions(+), 17 deletions(-)

diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 2b0124394e24..5b679bfbc7f7 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -386,7 +386,7 @@ static void __init hv_get_partition_id(void)
status = hv_do_hypercall(HVCALL_GET_PARTITION_ID, NULL, output_page);
if (!hv_result_success(status)) {
/* No point in proceeding if this failed */
- pr_err("Failed to get partition ID: %lld\n", status);
+ pr_err("Failed to get partition ID: %s\n", hv_status_to_string(status));
BUG();
}
hv_current_partition_id = output_page->partition_id;
diff --git a/arch/x86/hyperv/hv_proc.c b/arch/x86/hyperv/hv_proc.c
index 5ba5ca1b2089..ed80da64649e 100644
--- a/arch/x86/hyperv/hv_proc.c
+++ b/arch/x86/hyperv/hv_proc.c
@@ -144,9 +144,9 @@ int hv_call_add_logical_proc(int node, u32 lp_index, u32 apic_id)

if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
if (!hv_result_success(status)) {
- pr_err("%s: cpu %u apic ID %u, %lld\n", __func__,
- lp_index, apic_id, status);
- ret = hv_result(status);
+ pr_err("%s: cpu %u apic ID %u, %s\n", __func__,
+ lp_index, apic_id, hv_status_to_string(status));
+ ret = hv_status_to_errno(status);
}
break;
}
diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
index 1316584983c1..8d76661a8c9f 100644
--- a/include/asm-generic/hyperv-tlfs.h
+++ b/include/asm-generic/hyperv-tlfs.h
@@ -212,19 +212,40 @@ enum HV_GENERIC_SET_FORMAT {
HV_HYPERCALL_RSVD2_MASK)

/* hypercall status code */
-#define HV_STATUS_SUCCESS 0
-#define HV_STATUS_INVALID_HYPERCALL_CODE 2
-#define HV_STATUS_INVALID_HYPERCALL_INPUT 3
-#define HV_STATUS_INVALID_ALIGNMENT 4
-#define HV_STATUS_INVALID_PARAMETER 5
-#define HV_STATUS_ACCESS_DENIED 6
-#define HV_STATUS_OPERATION_DENIED 8
-#define HV_STATUS_INSUFFICIENT_MEMORY 11
-#define HV_STATUS_INVALID_PORT_ID 17
-#define HV_STATUS_INVALID_CONNECTION_ID 18
-#define HV_STATUS_INSUFFICIENT_BUFFERS 19
-#define HV_STATUS_TIME_OUT 120
-#define HV_STATUS_VTL_ALREADY_ENABLED 134
+#define __HV_STATUS_DEF(OP) \
+ OP(HV_STATUS_SUCCESS, 0x0) \
+ OP(HV_STATUS_INVALID_HYPERCALL_CODE, 0x2) \
+ OP(HV_STATUS_INVALID_HYPERCALL_INPUT, 0x3) \
+ OP(HV_STATUS_INVALID_ALIGNMENT, 0x4) \
+ OP(HV_STATUS_INVALID_PARAMETER, 0x5) \
+ OP(HV_STATUS_ACCESS_DENIED, 0x6) \
+ OP(HV_STATUS_INVALID_PARTITION_STATE, 0x7) \
+ OP(HV_STATUS_OPERATION_DENIED, 0x8) \
+ OP(HV_STATUS_UNKNOWN_PROPERTY, 0x9) \
+ OP(HV_STATUS_PROPERTY_VALUE_OUT_OF_RANGE, 0xA) \
+ OP(HV_STATUS_INSUFFICIENT_MEMORY, 0xB) \
+ OP(HV_STATUS_INVALID_PARTITION_ID, 0xD) \
+ OP(HV_STATUS_INVALID_VP_INDEX, 0xE) \
+ OP(HV_STATUS_NOT_FOUND, 0x10) \
+ OP(HV_STATUS_INVALID_PORT_ID, 0x11) \
+ OP(HV_STATUS_INVALID_CONNECTION_ID, 0x12) \
+ OP(HV_STATUS_INSUFFICIENT_BUFFERS, 0x13) \
+ OP(HV_STATUS_NOT_ACKNOWLEDGED, 0x14) \
+ OP(HV_STATUS_INVALID_VP_STATE, 0x15) \
+ OP(HV_STATUS_NO_RESOURCES, 0x1D) \
+ OP(HV_STATUS_PROCESSOR_FEATURE_NOT_SUPPORTED, 0x20) \
+ OP(HV_STATUS_INVALID_LP_INDEX, 0x41) \
+ OP(HV_STATUS_INVALID_REGISTER_VALUE, 0x50) \
+ OP(HV_STATUS_TIME_OUT, 0x78) \
+ OP(HV_STATUS_CALL_PENDING, 0x79) \
+ OP(HV_STATUS_VTL_ALREADY_ENABLED, 0x86)
+
+#define __HV_MAKE_HV_STATUS_ENUM(NAME, VAL) NAME = (VAL),
+#define __HV_MAKE_HV_STATUS_CASE(NAME, VAL) case (NAME): return (#NAME);
+
+enum hv_status {
+ __HV_STATUS_DEF(__HV_MAKE_HV_STATUS_ENUM)
+};

/*
* The Hyper-V TimeRefCount register and the TSC
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index c9e166d73fca..81bacd4bce66 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -305,6 +305,39 @@ static inline int cpumask_to_vpset_skip(struct hv_vpset *vpset,
return __cpumask_to_vpset(vpset, cpus, func);
}

+
+static inline int hv_status_to_errno(u64 hv_status)
+{
+ switch (hv_result(hv_status)) {
+ case HV_STATUS_SUCCESS:
+ return 0;
+ case HV_STATUS_INVALID_PARAMETER:
+ case HV_STATUS_UNKNOWN_PROPERTY:
+ case HV_STATUS_PROPERTY_VALUE_OUT_OF_RANGE:
+ case HV_STATUS_INVALID_VP_INDEX:
+ case HV_STATUS_INVALID_REGISTER_VALUE:
+ case HV_STATUS_INVALID_LP_INDEX:
+ case HV_STATUS_PROCESSOR_FEATURE_NOT_SUPPORTED:
+ return -EINVAL;
+ case HV_STATUS_ACCESS_DENIED:
+ case HV_STATUS_OPERATION_DENIED:
+ return -EACCES;
+ case HV_STATUS_NOT_ACKNOWLEDGED:
+ case HV_STATUS_INVALID_VP_STATE:
+ case HV_STATUS_INVALID_PARTITION_STATE:
+ return -EBADFD;
+ }
+ return -ENOTRECOVERABLE;
+}
+
+static inline const char *hv_status_to_string(u64 hv_status)
+{
+ switch (hv_result(hv_status)) {
+ __HV_STATUS_DEF(__HV_MAKE_HV_STATUS_CASE)
+ default : return "Unknown";
+ }
+}
+
void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die);
bool hv_is_hyperv_initialized(void);
bool hv_is_hibernation_supported(void);
--
2.25.1