linux-kernel - Re: [PATCH v5 00/12] x86: major paravirt cleanup

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Message-ID: <YEZRUh6sYS+8Rm+I@hirez.programming.kicks-ass.net>
Date:   Mon, 8 Mar 2021 17:31:14 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Juergen Gross <jgross@...e.com>
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, virtualization@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-hyperv@...r.kernel.org,
        kvm@...r.kernel.org, clang-built-linux@...glegroups.com,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jason Baron <jbaron@...mai.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ard Biesheuvel <ardb@...nel.org>, Deep Shah <sdeep@...are.com>,
        "VMware, Inc." <pv-drivers@...are.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v5 00/12] x86: major paravirt cleanup

On Mon, Mar 08, 2021 at 01:28:32PM +0100, Juergen Gross wrote:
> This is a major cleanup of the paravirt infrastructure aiming at
> eliminating all custom code patching via paravirt patching.
> 
> This is achieved by using ALTERNATIVE instead, leading to the ability
> to give objtool access to the patched in instructions.
> 
> In order to remove most of the 32-bit special handling from pvops the
> time related operations are switched to use static_call() instead.
> 
> At the end of this series all paravirt patching has to do is to
> replace indirect calls with direct ones. In a further step this could
> be switched to static_call(), too.

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>

I've rebased my objtool/retpoline branch on top of this, will post
if/when this hits tip. Negative alternative works like a charm.