linux-kernel - Re: [PATCH RESEND] x86-64: use RIP-relative calls for paravirt indirect ones

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Message-ID: <alpine.DEB.2.21.1808201654230.1551@nanos.tec.linutronix.de>
Date:   Mon, 20 Aug 2018 16:54:54 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jan Beulich <JBeulich@...e.com>
cc:     the arch/x86 maintainers <x86@...nel.org>,
        Juergen Gross <jgross@...e.com>,
        Alok Kataria <akataria@...are.com>,
        Linux Virtualization <virtualization@...ts.linux-foundation.org>,
        linux-kernel@...r.kernel.org, hpa@...or.com
Subject: Re: [PATCH RESEND] x86-64: use RIP-relative calls for paravirt
 indirect ones

On Wed, 15 Aug 2018, Jan Beulich wrote:

> This saves one insn byte per instance, summing up to a savings of over
> 4k in my (stripped down) configuration. No variant of to be patched in
> replacement code relies on the one byte larger size.
> 
> Signed-off-by: Jan Beulich <jbeulich@...e.com>
> Reviewed-by: Juergen Gross <jgross@...e.com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>