linux-kernel - Re: [PATCH 14/62] x86/boot/compressed/64: Add stage1 #VC handler

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Date:   Wed, 12 Feb 2020 08:22:14 -0800
From:   Andy Lutomirski <luto@...capital.net>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Hellstrom <thellstrom@...are.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>,
        LKML <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        Linux Virtualization <virtualization@...ts.linux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 14/62] x86/boot/compressed/64: Add stage1 #VC handler



> On Feb 12, 2020, at 3:38 AM, Joerg Roedel <joro@...tes.org> wrote:
> 
> On Tue, Feb 11, 2020 at 02:23:22PM -0800, Andy Lutomirski wrote:
>>> On Tue, Feb 11, 2020 at 5:53 AM Joerg Roedel <joro@...tes.org> wrote:
>>> +void __init no_ghcb_vc_handler(struct pt_regs *regs)
>> 
>> Isn't there a second parameter: unsigned long error_code?
> 
> No, the function gets the error-code from regs->orig_ax. This particular
> function only needs to check for error_code == SVM_EXIT_CPUID, as that
> is the only one supported when there is no GHCB.
> 

Hmm. It might be nice to use the same signature for early handlers as for normal ones.

> Regards,
> 
>    Joerg