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BM/tdx-host: restrict ftrace profiling to Dynamic PAMT functions #600

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Merged
hongyuni merged 1 commit into from
Sep 15, 2026
Merged

BM/tdx-host: restrict ftrace profiling to Dynamic PAMT functions #600

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21 changes: 16 additions & 5 deletions BM/tdx-host/tdx_dpamt_test.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -144,13 +144,24 @@ get_dpamt_kb() {

# function to start function profiling for a testcase
dpamt_profile_start() {
local profile=/sys/kernel/tracing/function_profile_enabled

if [ ! -w "$profile" ]; then
die "Function profiler control $profile is not writable."
fi
local trace=/sys/kernel/tracing
local profile="$trace/function_profile_enabled"
local filter="$trace/set_ftrace_filter"
local available="$trace/available_filter_functions"
local function

for function in tdh_phymem_pamt_add tdh_phymem_pamt_remove; do
grep -qw "$function" "$available" || \
die "Function $function is unavailable for ftrace."
done

echo 0 > "$profile" || die "Failed to reset function profiling."
echo nop > "$trace/current_tracer" || die "Failed to select the nop tracer."
: > "$filter" || die "Failed to clear the ftrace function filter."
echo tdh_phymem_pamt_add > "$filter" || \
die "Failed to add tdh_phymem_pamt_add to the ftrace function filter."
echo tdh_phymem_pamt_remove >> "$filter" || \
die "Failed to add tdh_phymem_pamt_remove to the ftrace function filter."
echo 1 > "$profile" || die "Failed to enable function profiling."
trap dpamt_profile_stop EXIT
test_print_trc "Function profiling enabled for dynamic PAMT accounting"
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