Re: [PATCH v6 2/4] x86/tests: Add tests for AMD SEV-ES #VC handling Add KUnit based tests to validate Linux's VC handling for instructions cpuid and wbinvd. These tests: 1. install a kretprobe on the #VC handler (sev_es_ghcb_hv_call, to access GHCB before/after the resulting VMGEXIT). 2. trigger an NAE by executing either cpuid or wbinvd. 3. check that the kretprobe was hit with the right exit_code available in GHCB.

[Sean Christopherson <seanjc@google.com>]

On Wed, Jun 08, 2022, Vasant Karasulli wrote:
> On Mi 08-06-22 14:35:55, Sean Christopherson wrote:
> > On Wed, Jun 08, 2022, Vasant Karasulli wrote:
> > > On Mi 06-04-22 01:22:55, Sean Christopherson wrote:
> > > > > +	if (ret) {
> > > > > +		kunit_info(test, "Could not register kretprobe. Skipping.");
> > > > > +		goto out;
> > > > > +	}
> > > > > +
> > > > > +	test->priv = kunit_kzalloc(test, sizeof(u64), GFP_KERNEL);
> > > >
> > > > Allocating 8 bytes and storing the pointer an 8-byte field is rather pointless :-)
> > > >
> > >
> > > Actually it's necessary to allocate memory to test->priv before using according to
> > > https://www.kernel.org/doc/html/latest/dev-tools/kunit/tips.html
> >
> > If priv points at structure of some form, sure, but you're storing a simple value.
> 
> Yes, I agree. The reason it was done this way I guess is that type of priv is a
> void pointer and storing a u64 value results in a compiler warning:
> cast from pointer to integer of different size [-Wpointer-to-int-cast].

An intermediate cast to "unsigned long" should make that go away.