Re: [PATCH] pseries: disable migration-test if /dev/kvm cannot be used

[Greg Kurz <groug@kaod.org>]

On Wed, 20 Nov 2019 18:09:55 +0100
Laurent Vivier <lvivier@redhat.com> wrote:

> On ppc64, migration-test only works with kvm_hv, and we already
> have a check to verify the module is loaded.
> 
> kvm_hv module can be loaded in memory and /sys/module/kvm_hv exists,
> but on some systems (like build systems) /dev/kvm can be missing
> (by administrators choice).
> 
> And as kvm_hv exists test-migration is started but QEMU falls back to
> TCG because it cannot be used:
> 
>     Could not access KVM kernel module: No such file or directory
>     failed to initialize KVM: No such file or directory
>     Back to tcg accelerator
> 
> And as the test is done with TCG, it fails.
> 
> As for s390x, we must check for the existence and the access rights
> of /dev/kvm.
> 
> Reported-by: Cole Robinson <crobinso@redhat.com>
> Signed-off-by: Laurent Vivier <lvivier@redhat.com>
> ---

Reviewed-by: Greg Kurz <groug@kaod.org>

>  tests/migration-test.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/migration-test.c b/tests/migration-test.c
> index ac780dffdaad..2b25ba6d77f6 100644
> --- a/tests/migration-test.c
> +++ b/tests/migration-test.c
> @@ -1349,7 +1349,8 @@ int main(int argc, char **argv)
>       * some reason)
>       */
>      if (g_str_equal(qtest_get_arch(), "ppc64") &&
> -        access("/sys/module/kvm_hv", F_OK)) {
> +        (access("/sys/module/kvm_hv", F_OK) ||
> +         access("/dev/kvm", R_OK | W_OK))) {
>          g_test_message("Skipping test: kvm_hv not available");
>          return g_test_run();
>      }