[Intel-gfx] [igt-dev] [PATCH i-g-t] i915: Add gem_vm_create

[Chris Wilson]

Quoting Tvrtko Ursulin (2019-04-01 09:12:08)
> 
> 
> On 30/03/2019 10:29, Chris Wilson wrote:
> > +     /* Verify the trick with the assumed target works */
> > +     write_to_address(i915, ctx[0], obj[0].offset, i915);
> > +     gem_read(i915, obj[0].handle, 0, &result, sizeof(result));
> > +     igt_assert_eq(result, i915);
> > +
> > +     /* Now check that we can't write to vm[0] from second fd/vm */
> > +     write_to_address(other, ctx[1], obj[0].offset, other);
> > +     gem_read(i915, obj[0].handle, 0, &result, sizeof(result));
> > +     igt_assert_eq(result, i915);
> > +
> 
> Relies on objects being zeroes (check) and neither fd being zero. To be 
> safe add asserts for the latter?

Just replace i915,other there with 1,2. Objects are verified to be zero
in other tests, and it's a core piece of ABI that we don't allow
information leaks so easily.
-Chris