linux-kernel - Re: [PATCH v6 42/76] x86/sev-es: Setup early #VC handler

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Date:   Tue, 1 Sep 2020 14:59:22 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, Joerg Roedel <jroedel@...e.de>, hpa@...or.com,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        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 <sean.j.christopherson@...el.com>,
        Martin Radev <martin.b.radev@...il.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v6 42/76] x86/sev-es: Setup early #VC handler

On Mon, Aug 31, 2020 at 11:45:41AM +0200, Borislav Petkov wrote:
> On Mon, Aug 24, 2020 at 10:54:37AM +0200, Joerg Roedel wrote:
> > +#ifdef CONFIG_AMD_MEM_ENCRYPT
> > +	/* VMM Communication Exception */
> > +	handler = fixup_pointer(vc_no_ghcb, physbase);
> > +	set_early_idt_handler(idt, X86_TRAP_VC, handler);
> 
> This function is used only once AFAICT - you might just as well add its
> three-lined body here and save yourself the function definition and
> ifdeffery above...

True, but having a separate function might be handy when support for #VE
and #HV is developed. Those might also need to setup their early
handlers here, no?

Regards,

	Joerg