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Date: Fri, 10 Jun 2022 10:28:08 +0200 From: Vasant Karasulli <vkarasulli@...e.de> To: Sean Christopherson <seanjc@...gle.com> 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 Mi 08-06-22 19:57:45, Sean Christopherson wrote: > 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. Yes, intermediate cast satisfied the compiler. Thanks for the tip. -- Vasant Karasulli Kernel generalist www.suse.com<http://www.suse.com> [https://www.suse.com/assets/img/social-platforms-suse-logo.png]<http://www.suse.com/> SUSE - Open Source Solutions for Enterprise Servers & Cloud<http://www.suse.com/> Modernize your infrastructure with SUSE Linux Enterprise servers, cloud technology for IaaS, and SUSE's software-defined storage. www.suse.com
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