Re: [PATCH v2 7/9] tests/qtest/migration: Define a machine for all architectures

[Fabiano Rosas <farosas@suse.de>]

Daniel P. Berrangé <berrange@redhat.com> writes:

> On Wed, Oct 11, 2023 at 04:28:41PM +0200, Juan Quintela wrote:
>> Fabiano Rosas <farosas@suse.de> wrote:
>> > Stop relying on defaults and select a machine explicitly for every
>> > architecture.
>> >
>> > This is a prerequisite for being able to select machine types for
>> > migration using different QEMU binaries for source and destination.
>> >
>> > Signed-off-by: Fabiano Rosas <farosas@suse.de>
>> > ---
>> >  tests/qtest/migration-test.c | 11 ++++++++++-
>> >  1 file changed, 10 insertions(+), 1 deletion(-)
>> >
>> > diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
>> > index 46f1c275a2..7c10ac925b 100644
>> > --- a/tests/qtest/migration-test.c
>> > +++ b/tests/qtest/migration-test.c
>> > @@ -746,6 +746,7 @@ static int test_migrate_start(QTestState **from, QTestState **to,
>> >      const char *kvm_opts = NULL;
>> >      const char *arch = qtest_get_arch();
>> >      const char *memory_size;
>> > +    const char *machine;
>> >  
>> >      if (args->use_shmem) {
>> >          if (!g_file_test("/dev/shm", G_FILE_TEST_IS_DIR)) {
>> > @@ -758,11 +759,13 @@ static int test_migrate_start(QTestState **from, QTestState **to,
>> >      got_dst_resume = false;
>> >      if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
>> >          memory_size = "150M";
>> > +        machine = "pc";
>> 
>> I would suggest:
>> 
>>       if (strcmp(arch, "i386")) {
>>           machine = "pc";
>>       } else {
>>           machine = "q35";
>>       }
>> 
>> New development is happening in q35, so I think this should be the more tested.
>> 
>> > @@ -774,10 +777,12 @@ static int test_migrate_start(QTestState **from, QTestState **to,
>> >                                        "'nvramrc=hex .\" _\" begin %x %x "
>> >                                        "do i c@ 1 + i c! 1000 +loop .\" B\" 0 "
>> >                                        "until'", end_address, start_address);
>> > +        machine = "pseries";
>> >          arch_opts = g_strdup("-nodefaults -machine vsmt=8");
>> >      } else if (strcmp(arch, "aarch64") == 0) {
>> >          memory_size = "150M";
>> > -        arch_opts = g_strdup_printf("-machine virt,gic-version=max -cpu max "
>> > +        machine = "virt";
>> > +        arch_opts = g_strdup_printf("-machine gic-version=max -cpu max "
>> 
>> Does this double -machine command line works?
>
> Why not just call the variable 'machine_opts' and here you can
> do
>
>  -        arch_opts = g_strdup_printf("-machine virt,gic-version=max -cpu max "
>  +        machine_opts = "virt,gic-version=max";
>  +        arch_opts = g_strdup_printf("-cpu max "

The machine name needs to be standalone so it can be overridden in the
next patch when we compute the common machine type.

Maybe I could add the machine_opts anyway just to make it more explicit.