Re: [PATCH for-4.16 3/4] test/tsx: set grant version for created domains

[Andrew Cooper <amc96@srcf.net>]

On 15/11/2021 13:58, Roger Pau Monné wrote:
> On Mon, Nov 15, 2021 at 12:43:34PM +0000, Andrew Cooper wrote:
>> On 15/11/2021 12:17, Roger Pau Monne wrote:
>>> Set the grant table version for the created domains to use version 1,
>>> as such tests domains don't require the usage of the grant table at
>>> all. A TODO note is added to switch those dummy domains to not have a
>>> grant table at all when possible. Without setting the grant version
>>> the domains for the tests cannot be created.
>>>
>>> Fixes: 7379f9e10a ('gnttab: allow setting max version per-domain')
>>> Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
>>> Reported-by: Jan Beulich <jbeulich@suse.com>
>>> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
>>> ---
>>> Cc: Ian Jackson <iwj@xenproject.org>
>>>
>>> This patch only modifies a test, so it should be safe to commit as
>>> it's not going to cause any changes to the hypervisor or the tools.
>>> Worse that could happen is it makes the test even more broken, but
>>> it's already unusable.
>> What do you mean unusable?  Other than this, the test works.
> I mean, it's unusable because I broke it with the gnttab change, and
> that's it's current status unless this patch is applied.
>
>>> ---
>>>  tools/tests/tsx/test-tsx.c | 4 ++++
>>>  1 file changed, 4 insertions(+)
>>>
>>> diff --git a/tools/tests/tsx/test-tsx.c b/tools/tests/tsx/test-tsx.c
>>> index fab99c135e..f1dcff4c30 100644
>>> --- a/tools/tests/tsx/test-tsx.c
>>> +++ b/tools/tests/tsx/test-tsx.c
>>> @@ -444,6 +444,8 @@ static void test_guests(void)
>>>          struct xen_domctl_createdomain c = {
>>>              .max_vcpus = 1,
>>>              .max_grant_frames = 1,
>>> +            /* TODO: switch to 0 once support for no grant table is added. */
>> I'd avoid these TODOs.  It's test code, so really doesn't matter too much.
> I'm fine with this, when looking at the test code I didn't see any
> reason why gnttab was needed, so I thought it would be a fine use-case
> for opting out to grant table. As you say it's a test case, so it
> doesn't matter much.
>
> Do you want me to repost with the comments removed?

I'm happy to fix on commit, if nothing else needs reposting.

~Andrew