linux-kernel - Re: [PATCH v9 05/43] x86/compressed/64: Detect/setup SEV/SME features earlier in boot

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Date:   Wed, 2 Feb 2022 11:28:01 -0600
From:   Michael Roth <michael.roth@....com>
To:     Borislav Petkov <bp@...en8.de>
CC:     Brijesh Singh <brijesh.singh@....com>, <x86@...nel.org>,
        <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
        <linux-efi@...r.kernel.org>, <platform-driver-x86@...r.kernel.org>,
        <linux-coco@...ts.linux.dev>, <linux-mm@...ck.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        "H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        "Vitaly Kuznetsov" <vkuznets@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        "Andy Lutomirski" <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Dov Murik <dovmurik@...ux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Andi Kleen <ak@...ux.intel.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        <brijesh.ksingh@...il.com>, <tony.luck@...el.com>,
        <marcorr@...gle.com>, <sathyanarayanan.kuppuswamy@...ux.intel.com>
Subject: Re: [PATCH v9 05/43] x86/compressed/64: Detect/setup SEV/SME
 features earlier in boot

On Wed, Feb 02, 2022 at 07:09:24AM +0100, Borislav Petkov wrote:
> On Tue, Feb 01, 2022 at 06:52:12PM -0600, Michael Roth wrote:
> > Since the kernel proper rdmsr()/wrmsr() definitions are getting pulled in via
> > misc.h, I have to use a different name to avoid compiler errors. For now I've
> > gone with rd_msr()/wr_msr(), but no problem changing those if needed.
> 
> Does that fix it too?
> 
> diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
> index 16ed360b6692..346c46d072c8 100644
> --- a/arch/x86/boot/compressed/misc.h
> +++ b/arch/x86/boot/compressed/misc.h
> @@ -21,7 +21,6 @@
>  
>  #include <linux/linkage.h>
>  #include <linux/screen_info.h>
> -#include <linux/elf.h>
>  #include <linux/io.h>
>  #include <asm/page.h>
>  #include <asm/boot.h>
> ---
> 
> This is exactly what I mean with a multi-year effort of untangling what
> has been mindlessly mixed in over the years...

Indeed... it looks like linux/{elf,io,efi,acpi}.h all end up pulling in
kernel proper's rdmsr()/wrmsr() definitions, and pulling them out ends up
breaking a bunch of other stuff, so I think we might be stuck using a
different name like rd_msr()/wr_msr() in the meantime.