Hi Drew, On 9/8/21 5:07 PM, Andrew Jones wrote: > On Wed, Sep 08, 2021 at 04:37:39PM +0100, Alexandru Elisei wrote: >> Hi Drew, >> >> On 9/7/21 11:21 AM, Andrew Jones wrote: >>> On Fri, Jul 02, 2021 at 05:31:21PM +0100, Alexandru Elisei wrote: >>>> Add support for the standalone target when running kvm-unit-tests under >>>> kvmtool. >>>> >>>> Example command line invocation: >>>> >>>> $ ./configure --target=kvmtool >>>> $ make clean && make standalone >>>> >>>> Signed-off-by: Alexandru Elisei <[email protected]> >>>> --- >>>> scripts/mkstandalone.sh | 14 +++++++------- >>>> 1 file changed, 7 insertions(+), 7 deletions(-) >>>> >>>> diff --git a/scripts/mkstandalone.sh b/scripts/mkstandalone.sh >>>> index 16f461c06842..d84bdb7e278c 100755 >>>> --- a/scripts/mkstandalone.sh >>>> +++ b/scripts/mkstandalone.sh >>>> @@ -44,6 +44,10 @@ generate_test () >>>> config_export ARCH_NAME >>>> config_export PROCESSOR >>>> >>>> + if [ "$ARCH" = "arm64" ] || [ "$ARCH" = "arm" ]; then >>>> + config_export TARGET >>>> + fi >>> Should export unconditionally, since we'll want TARGET set >>> unconditionally. >> Yes, will do. >> >>>> + >>>> echo "echo BUILD_HEAD=$(cat build-head)" >>>> >>>> if [ ! -f $kernel ]; then >>>> @@ -59,7 +63,7 @@ generate_test () >>>> echo 'export FIRMWARE' >>>> fi >>>> >>>> - if [ "$ENVIRON_DEFAULT" = "yes" ] && [ "$ERRATATXT" ]; then >>>> + if [ "$TARGET" != "kvmtool" ] && [ "$ENVIRON_DEFAULT" = "yes" ] && [ >>>> "$ERRATATXT" ]; then >>> I think it would be better to ensure that ENVIRON_DEFAULT is "no" for >>> TARGET=kvmtool in configure. >> From looking at the code, it is my understanding that with >> ENVIRON_DEFAULT=yes, an >> initrd file is generated with the contents of erratatxt and other >> information, in >> a key=value pair format. This initrd is then passed on to the test (please >> correct >> me if I'm wrong). With ENVIRON_DEFAULT=no (set via ./configure >> --disable-default-environ), this initrd is not generated. >> >> kvmtool doesn't have support for passing an initrd when loading firmware, so >> yes, >> I believe the default should be no. >> >> However, I have two questions: >> >> 1. What happens when the user specifically enables the default environ via >> ./configure --enable-default-environ --target=kvmtool? In my opinion, that >> should >> be an error because the user wants something that is not possible with >> kvmtool >> (loading an image with --firmware in kvmtool means that the initrd image it >> not >> loaded into the guest memory and no node is generated for it in the dtb), >> but I >> would like to hear your thoughts about it. > As part of the forcing ENVIRON_DEFAULT to "no" for kvmtool in configure an > error should be generated if a user tries to explicitly enable it. > >> 2. If the default environment is disabled, is it still possible for an user >> to >> pass an initrd via other means? I couldn't find where that is implemented, >> so I'm >> guessing it's not possible. > Yes, a user could have a KVM_UNIT_TESTS_ENV environment variable set when > they launch the tests. If that variable points to a file then it will get > passed as an initrd. I guess you should also report a warning in arm/run > if KVM_UNIT_TESTS_ENV is set which states that the environment file will > be ignored when running with kvmtool.
Thank you for explaining it, I had looked at scripts/arch-run.bash::initrd_create(), but it didn't click that setting the KVM_UNIT_TESTS_ENV environment variable is enough to generate and use the initrd. After looking at the code some more, in the logs the -initrd argument is shown as a comment, instead of an actual argument that is passed to qemu: timeout -k 1s --foreground 90s /usr/bin/qemu-system-aarch64 -nodefaults -machine virt,gic-version=host,accel=kvm -cpu host -device virtio-serial-device -device virtconsole,chardev=ctd -chardev testdev,id=ctd -device pci-testdev -display none -serial stdio -kernel arm/cache.flat -smp 1 # -initrd /tmp/tmp.rUIZ3h9KLJ QEMU_ACCEL = kvm INFO: IDC-DIC: dcache clean to PoU required INFO: IDC-DIC: icache invalidation to PoU required PASS: IDC-DIC: code generation SUMMARY: 1 tests This is done intentionally in scripts/arch-run.bash::run_qemu(). I don't understand the reason for that. When I first looked at the logs, I was sure that no initrd is passed to the test. I had to go dig through the scripts to figure out that the "#" sign (which marks the beginning of a comment) is not present in the qemu invocation. Thanks, Alex > > There aren't currently any other ways to invoke the addition of the > -initrd command line option, because so far we only support passing a > single file to test (the environment "file"). If we ever want to pass > more files, then we'd need to create a simple file system on the initrd > and make it possible to add -initrd even when no environment is desired. > But, that may never happen. > > Thanks, > drew > >> Thanks, >> >> Alex >> >>> >>>> temp_file ERRATATXT "$ERRATATXT" >>>> echo 'export ERRATATXT' >>>> fi >>>> @@ -95,12 +99,8 @@ function mkstandalone() >>>> echo Written $standalone. >>>> } >>>> >>>> -if [ "$TARGET" = "kvmtool" ]; then >>>> - echo "Standalone tests not supported with kvmtool" >>>> - exit 2 >>>> -fi >>>> - >>>> -if [ "$ENVIRON_DEFAULT" = "yes" ] && [ "$ERRATATXT" ] && [ ! -f >>>> "$ERRATATXT" ]; then >>>> +if [ "$TARGET" != "kvmtool" ] && [ "$ENVIRON_DEFAULT" = "yes" ] && \ >>>> + [ "$ERRATATXT" ] && [ ! -f "$ERRATATXT" ]; then >>>> echo "$ERRATATXT not found. (ERRATATXT=$ERRATATXT)" >&2 >>>> exit 2 >>>> fi >>>> -- >>>> 2.32.0 >>>> >>> Thanks, >>> drew >>> _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
