Commit cfc42685 authored by Stanislav Kinsburskii's avatar Stanislav Kinsburskii Committed by Wei Liu
Browse files

mshv: Add tracepoint for GPA intercept handling 



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

Signed-off-by: default avatarStanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Reviewed-by: default avatarAnirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
parent 404cd6bf

drivers/hv/mshv_root_main.c

+4 −2
Original line number Diff line number Diff line
@@ -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;

}

drivers/hv/mshv_trace.h

+29 −0
Original line number Diff line number Diff line
@@ -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 */