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mshv: Add tracepoint for GPA intercept handling

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Provide visibility into GPA intercept operations for debugging and
performance analysis of Microsoft Hypervisor guest memory management.

Signed-off-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Reviewed-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Stanislav Kinsburskii
2026-03-24 23:59:59 +00:00
committed by Wei Liu
parent 404cd6bffe
commit cfc42685e5
2 changed files with 33 additions and 2 deletions
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6
drivers/hv/mshv_root_main.c
View File

@@ -674,7 +674,7 @@ static bool mshv_handle_gpa_intercept(struct mshv_vp *vp)
region = mshv_partition_region_by_gfn_get(p, gfn);
if (!region)
return false;
goto out;
if (access_type == HV_INTERCEPT_ACCESS_WRITE &&
!(region->hv_map_flags & HV_MAP_GPA_WRITABLE))
@@ -690,7 +690,9 @@ static bool mshv_handle_gpa_intercept(struct mshv_vp *vp)
put_region:
mshv_region_put(region);
out:
trace_mshv_handle_gpa_intercept(p->pt_id, vp->vp_index, gfn,
access_type, ret);
return ret;
}

29
drivers/hv/mshv_trace.h
View File

@@ -12,6 +12,7 @@
#define _MSHV_TRACE_H_
#include <linux/tracepoint.h>
#include <hyperv/hvhdk.h>
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH ../../drivers/hv
@@ -509,6 +510,34 @@ TRACE_EVENT(mshv_vp_wait_for_hv_kick,
)
);
TRACE_EVENT(mshv_handle_gpa_intercept,
TP_PROTO(u64 partition_id, u32 vp_index, u64 gfn, u8 access_type, bool handled),
TP_ARGS(partition_id, vp_index, gfn, access_type, handled),
TP_STRUCT__entry(
__field(u64, partition_id)
__field(u32, vp_index)
__field(u64, gfn)
__field(u8, access_type)
__field(bool, handled)
),
TP_fast_assign(
__entry->partition_id = partition_id;
__entry->vp_index = vp_index;
__entry->gfn = gfn;
__entry->access_type = access_type == HV_INTERCEPT_ACCESS_READ ? 'R' :
(access_type == HV_INTERCEPT_ACCESS_WRITE ? 'W' :
(access_type == HV_INTERCEPT_ACCESS_EXECUTE ? 'X' : '?'));
__entry->handled = handled;
),
TP_printk("partition_id=%llu vp_index=%u gfn=0x%llx access_type=%c handled=%d",
__entry->partition_id,
__entry->vp_index,
__entry->gfn,
__entry->access_type,
__entry->handled
)
);
#endif /* _MSHV_TRACE_H_ */
/* This part must be outside protection */