linux-kernel - Re: [PATCH v6 1/2] x86/sev: Make sure IRQs are disabled while GHCB is active

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Message-ID: <YMxWsjZcudaorPgV@8bytes.org>
Date:   Fri, 18 Jun 2021 10:17:54 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, Joerg Roedel <jroedel@...e.de>, hpa@...or.com,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>,
        David Rientjes <rientjes@...gle.com>,
        Cfir Cohen <cfir@...gle.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mike Stunes <mstunes@...are.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Martin Radev <martin.b.radev@...il.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v6 1/2] x86/sev: Make sure IRQs are disabled while GHCB
 is active

On Thu, Jun 17, 2021 at 05:38:46PM +0200, Peter Zijlstra wrote:
> I'm getting (with all of v6.1 applied):
> 
> vmlinux.o: warning: objtool: __sev_es_nmi_complete()+0x1bf: call to panic() leaves .noinstr.text section
> 
> $ ./scripts/faddr2line defconfig-build/vmlinux __sev_es_nmi_complete+0x1bf
> __sev_es_nmi_complete+0x1bf/0x1d0:
> __sev_get_ghcb at arch/x86/kernel/sev.c:223
> (inlined by) __sev_es_nmi_complete at arch/x86/kernel/sev.c:519

I see where this is coming from, but can't create the same warning. I
did run 'objtool check -n vmlinux'. Is there more to do to get the full
check?

Regards,

	Joerg