linux-kernel - Re: [PATCH v6 1/4] x86/tests: Add tests for AMD SEV-ES #VC handling

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Date:   Tue, 7 Jun 2022 11:45:59 +0200
From:   Vasant Karasulli <vkarasulli@...e.de>
To:     Borislav Petkov <bp@...en8.de>
Cc:     linux-kernel@...r.kernel.org, jroedel@...e.de, kvm@...r.kernel.org,
        x86@...nel.org, thomas.lendacky@....com, varad.gautam@...e.com
Subject: Re: [PATCH v6 1/4] x86/tests: Add tests for AMD SEV-ES #VC handling

On Fr 08-04-22 15:44:26, Borislav Petkov wrote:
> > Subject: Re: [PATCH v6 1/4] x86/tests: Add tests for AMD SEV-ES #VC handling
>
> > diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
> > index 6aef9ee28a39..69472a576909 100644
> > --- a/arch/x86/kernel/Makefile
> > +++ b/arch/x86/kernel/Makefile
> > @@ -24,6 +24,13 @@ CFLAGS_REMOVE_sev.o = -pg
> >  CFLAGS_REMOVE_cc_platform.o = -pg
> >  endif
> >
> > +# AMD_SEV_TEST_VC registers a kprobe by function name. IPA-SRA creates
> > +# function copies and renames them to have an .isra suffix, which breaks kprobes'
> > +# lookup. Build with -fno-ipa-sra for the test.
> > +ifdef CONFIG_AMD_SEV_TEST_VC
>
> Why ifdef?
>
> I think you want this to be enabled unconditionally since the VC tests
> select KRPOBES.
>

VC tests added in this patch series depend on the configuration
option CONFIG_AMD_SEV_TEST_VC which in turn selects KPROBES.
I think compiler flag -fno-ipa-sra wouldn't be necessary if
configuration option CONFIG_AMD_SEV_TEST_VC is disabled.

> > +CFLAGS_sev.o	+= -fno-ipa-sra
> > +endif
> > +
>
> --
> Regards/Gruss,
>     Boris.
>
> https://people.kernel.org/tglx/notes-about-netiquette

--
Vasant Karasulli
Kernel generalist
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