linux-kernel - Re: [PATCH 1/5] x86/boot/compressed/64: Introduce sev

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Date:   Tue, 20 Oct 2020 11:55:25 +0200
From:   Joerg Roedel <jroedel@...e.de>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Joerg Roedel <joro@...tes.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Martin Radev <martin.b.radev@...il.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] x86/boot/compressed/64: Introduce sev_status

On Mon, Oct 19, 2020 at 05:59:25PM -0700, Sean Christopherson wrote:
> On Mon, Oct 19, 2020 at 05:11:17PM +0200, Joerg Roedel wrote:
> > +	push	%rax
> > +	push	%rcx
> 
> There's no need to save/restore RAX and RCX, they are callee save.  This
> function is only called from C, so I doubt it's using a custom ABI.

Right, removed the save/restore of these registers from the function.

Thanks,

	Joerg