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Message-ID: <YqD/ObG9ae9YQVNy@google.com>
Date: Wed, 8 Jun 2022 19:57:45 +0000
From: Sean Christopherson <seanjc@...gle.com>
To: Vasant Karasulli <vkarasulli@...e.de>
Cc: linux-kernel@...r.kernel.org, jroedel@...e.de, kvm@...r.kernel.org,
bp@...en8.de, x86@...nel.org, thomas.lendacky@....com
Subject: 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.
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.
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