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hyperv: Log hypercall status codes as strings

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Introduce hv_status_printk() macros as a convenience to log hypercall
errors, formatting them with the status code (HV_STATUS_*) as a raw hex
value and also as a string, which saves some time while debugging.

Create a table of HV_STATUS_ codes with strings and mapped errnos, and
use it for hv_result_to_string() and hv_result_to_errno().

Use the new hv_status_printk()s in hv_proc.c, hyperv-iommu.c, and
irqdomain.c hypercalls to aid debugging in the root partition.

Signed-off-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Reviewed-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Link: https://lore.kernel.org/r/1741980536-3865-2-git-send-email-nunodasneves@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <1741980536-3865-2-git-send-email-nunodasneves@linux.microsoft.com>
This commit is contained in:
Nuno Das Neves
2025-03-14 12:28:47 -07:00
committed by Wei Liu
parent e792d843aa
commit 3817854ba8
5 changed files with 118 additions and 44 deletions
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13
include/asm-generic/mshyperv.h
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@@ -298,6 +298,19 @@ static inline int cpumask_to_vpset_skip(struct hv_vpset *vpset,
return __cpumask_to_vpset(vpset, cpus, func);
}
#define _hv_status_fmt(fmt) "%s: Hyper-V status: %#x = %s: " fmt
#define hv_status_printk(level, status, fmt, ...) \
do { \
u64 __status = (status); \
pr_##level(_hv_status_fmt(fmt), __func__, hv_result(__status), \
hv_result_to_string(__status), ##__VA_ARGS__); \
} while (0)
#define hv_status_err(status, fmt, ...) \
hv_status_printk(err, status, fmt, ##__VA_ARGS__)
#define hv_status_debug(status, fmt, ...) \
hv_status_printk(debug, status, fmt, ##__VA_ARGS__)
const char *hv_result_to_string(u64 hv_status);
int hv_result_to_errno(u64 status);
void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die);
bool hv_is_hyperv_initialized(void);