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.

Vasant Karasulli
2022-06-08T09:26:27Z

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 (!test->priv) {
> > + ret = -ENOMEM;
> > + kunit_info(test, "Could not allocate. Skipping.");
> > + goto out;
> > + }
> > +

--
Vasant Karasulli
Kernel generalist
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