Re: [kvm-unit-tests PATCH v1 3/3] arm64: efi: Make running tests on EFI can be parallel

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Hi drew,

On 11/29/23 17:27, Andrew Jones wrote:
On Tue, Nov 28, 2023 at 10:21:23PM -0500, Shaoqin Huang wrote:
Currently running tests on EFI in parallel can cause part of tests to
fail, this is because arm/efi/run script use the EFI_CASE to create the
subdir under the efi-tests, and the EFI_CASE is the filename of the
test, when running tests in parallel, the multiple tests exist in the
same filename will execute at the same time, which will use the same
directory and write the test specific things into it, this cause
chaotic and make some tests fail.

How do they fail? iiuc, we're switching from having one of each unique
binary on the efi partition to multiple redundant binaries, since we
copy the binary for each test, even when it's the same as for other
tests. It seems like we should be able to keep single unique binaries
and resolve the parallel execution failure by just checking for existence
of the binaries or only creating test-specific data directories or
something.


The problem comes from the arm/efi/run script, as you can see. If we parallel running multiple tests on efi, for example, running the pmu-sw-incr and pmu-chained-counters and other pmu tests at the same time, the EFI_CASE will be pmu. So they will write their $cmd_args to the $EFI/TEST/pmu/startup.nsh at the same time, which will corrupt the startup.nsh file.

cp "$EFI_SRC/$EFI_CASE.efi" "$EFI_TEST/$EFI_CASE/"
echo "@echo -off" > "$EFI_TEST/$EFI_CASE/startup.nsh"
...
echo "$EFI_CASE.efi" "${cmd_args[@]}" >> "$EFI_TEST/$EFI_CASE/startup.nsh"

And I can get the log which outputs:

* pmu-sw-incr.log:
  - ABORT: pmu: Unknown sub-test 'pmu-mem-acce'
* pmu-chained-counters.log
  - ABORT: pmu: Unknown sub-test 'pmu-mem-access-reliab'

And the efi-tests/pmu/startup.nsh:

@echo -off
setvar fdtfile -guid 97ef3e03-7329-4a6a-b9ba-6c1fdcc5f823 -rt =L"dtb"
pmu.efi pmu-mem-access-reliability
setvar fdtfile -guid 97ef3e03-7329-4a6a-b9ba-6c1fdcc5f823 -rt =L"dtb"
pmu.efi pmu-chained-sw-incr


Thus when running parallel, some of them will fail. So I create different sub-dir in the efi-tests for each small test.

Thanks,
Shaoqin


To Fix this things, use the testname instead of the filename to create
the subdir under the efi-tests. We use the EFI_TESTNAME to replace the
EFI_CASE in script. Since every testname is specific, now the tests
can be run parallel. It also considers when user directly use the
arm/efi/run to run test, in this case, still use the filename.

Besides, replace multiple $EFI_TEST/$EFI_CASE to the $EFI_CASE_DIR, this
makes the script looks more clean and we don'e need to replace many
EFI_CASE to EFI_TESTNAME.

Signed-off-by: Shaoqin Huang <shahuang@xxxxxxxxxx>
---
  arm/efi/run | 16 +++++++++-------
  1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/arm/efi/run b/arm/efi/run
index 6872c337..03bfbef4 100755
--- a/arm/efi/run
+++ b/arm/efi/run
@@ -24,6 +24,8 @@ fi
  : "${EFI_SRC:=$TEST_DIR}"
  : "${EFI_UEFI:=$DEFAULT_UEFI}"
  : "${EFI_TEST:=efi-tests}"
+: "${EFI_TESTNAME:=$TESTNAME}"
+: "${EFI_TESTNAME:=$(basename $1 .efi)}"
  : "${EFI_CASE:=$(basename $1 .efi)}"
  : "${EFI_VAR_GUID:=97ef3e03-7329-4a6a-b9ba-6c1fdcc5f823}"
@@ -56,20 +58,20 @@ if [ "$EFI_CASE" = "_NO_FILE_4Uhere_" ]; then
  	EFI_CASE=dummy
  fi
-: "${EFI_CASE_DIR:="$EFI_TEST/$EFI_CASE"}"
+: "${EFI_CASE_DIR:="$EFI_TEST/$EFI_TESTNAME"}"
  mkdir -p "$EFI_CASE_DIR"
-cp "$EFI_SRC/$EFI_CASE.efi" "$EFI_TEST/$EFI_CASE/"
-echo "@echo -off" > "$EFI_TEST/$EFI_CASE/startup.nsh"
+cp "$EFI_SRC/$EFI_CASE.efi" "$EFI_CASE_DIR/"
+echo "@echo -off" > "$EFI_CASE_DIR/startup.nsh"

Unrelated change, should be a separate patch.


Ok, Will separate it.

  if [ "$EFI_USE_DTB" = "y" ]; then
  	qemu_args+=(-machine acpi=off)
  	FDT_BASENAME="dtb"
-	$(EFI_RUN=y $TEST_DIR/run -machine dumpdtb="$EFI_TEST/$EFI_CASE/$FDT_BASENAME" "${qemu_args[@]}")
-	echo "setvar fdtfile -guid $EFI_VAR_GUID -rt =L\"$FDT_BASENAME\""  >> "$EFI_TEST/$EFI_CASE/startup.nsh"
+	$(EFI_RUN=y $TEST_DIR/run -machine dumpdtb="$EFI_CASE_DIR/$FDT_BASENAME" "${qemu_args[@]}")
+	echo "setvar fdtfile -guid $EFI_VAR_GUID -rt =L\"$FDT_BASENAME\""  >> "$EFI_CASE_DIR/startup.nsh"
  fi
-echo "$EFI_CASE.efi" "${cmd_args[@]}" >> "$EFI_TEST/$EFI_CASE/startup.nsh"
+echo "$EFI_CASE.efi" "${cmd_args[@]}" >> "$EFI_CASE_DIR/startup.nsh"
EFI_RUN=y $TEST_DIR/run \
         -bios "$EFI_UEFI" \
-       -drive file.dir="$EFI_TEST/$EFI_CASE/",file.driver=vvfat,file.rw=on,format=raw,if=virtio \
+       -drive file.dir="$EFI_CASE_DIR/",file.driver=vvfat,file.rw=on,format=raw,if=virtio \
         "${qemu_args[@]}"
--
2.40.1


Thanks,
drew


--
Shaoqin





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