From: Peter Zijlstra <peterz@infradead.org>
To: Juergen Gross <jgross@suse.com>
Cc: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org,
x86@kernel.org, virtualization@lists.linux-foundation.org,
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Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Andy Lutomirski <luto@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>
Subject: Re: [PATCH v5 00/12] x86: major paravirt cleanup
Date: Mon, 8 Mar 2021 17:31:14 +0100 [thread overview]
Message-ID: <YEZRUh6sYS+8Rm+I@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20210308122844.30488-1-jgross@suse.com>
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@infradead.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.
prev parent reply other threads:[~2021-03-08 16:33 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-08 12:28 [PATCH v5 00/12] x86: major paravirt cleanup Juergen Gross
2021-03-08 12:28 ` [PATCH v5 01/12] staticcall: move struct static_call_key definition to static_call_types.h Juergen Gross
2021-03-08 16:27 ` Peter Zijlstra
2021-03-08 12:28 ` [PATCH v5 02/12] x86/paravirt: switch time pvops functions to use static_call() Juergen Gross
2021-03-08 17:00 ` Boris Ostrovsky
2021-03-09 6:14 ` Jürgen Groß
2021-03-08 12:28 ` [PATCH v5 03/12] x86/alternative: drop feature parameter from ALTINSTR_REPLACEMENT() Juergen Gross
2021-03-08 12:28 ` [PATCH v5 04/12] x86/alternative: support not-feature Juergen Gross
2021-03-08 12:28 ` [PATCH v5 05/12] x86/alternative: support ALTERNATIVE_TERNARY Juergen Gross
2021-03-08 12:28 ` [PATCH v5 06/12] x86: add new features for paravirt patching Juergen Gross
2021-03-08 12:28 ` [PATCH v5 07/12] x86/paravirt: remove no longer needed 32-bit pvops cruft Juergen Gross
2021-03-08 12:28 ` [PATCH v5 08/12] x86/paravirt: simplify paravirt macros Juergen Gross
2021-03-08 12:28 ` [PATCH v5 09/12] x86/paravirt: switch iret pvops to ALTERNATIVE Juergen Gross
2021-03-08 12:28 ` [PATCH v5 10/12] x86/paravirt: add new macros PVOP_ALT* supporting pvops in ALTERNATIVEs Juergen Gross
2021-03-08 12:28 ` [PATCH v5 11/12] x86/paravirt: switch functions with custom code to ALTERNATIVE Juergen Gross
2021-03-08 18:30 ` Borislav Petkov
2021-03-09 6:21 ` Jürgen Groß
2021-03-08 12:28 ` [PATCH v5 12/12] x86/paravirt: have only one paravirt patch function Juergen Gross
2021-03-08 16:31 ` Peter Zijlstra [this message]
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