linux-kernel - [PATCH 0/4] Switch X86_FEATURE_XENPV to cpu_feature

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Date:   Thu,  3 Nov 2022 12:36:32 +0100
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        x86@...nel.org
Cc:     Juergen Gross <jgross@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Pu Wen <puwen@...on.cn>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 0/4] Switch X86_FEATURE_XENPV to cpu_feature_enabled() use

Make especially kernels without CONFIG_XEN_PV more efficient by
using cpu_feature_enabled(X86_FEATURE_XENPV) instead of boot_cpu_has()
and friends.

Juergen Gross (4):
  x86: add X86_FEATURE_XENPV to disabled-features.h
  x86: remove unneeded 64-bit dependency in arch_enter_from_user_mode()
  x86: drop 32-bit Xen PV guest code in update_task_stack()
  x86: switch to cpu_feature_enabled() for X86_FEATURE_XENPV

 arch/x86/include/asm/disabled-features.h | 8 +++++++-
 arch/x86/include/asm/entry-common.h      | 4 ++--
 arch/x86/include/asm/switch_to.h         | 7 ++-----
 arch/x86/kernel/cpu/amd.c                | 2 +-
 arch/x86/kernel/cpu/bugs.c               | 2 +-
 arch/x86/kernel/cpu/hygon.c              | 2 +-
 arch/x86/kernel/process_64.c             | 4 ++--
 arch/x86/kernel/topology.c               | 2 +-
 arch/x86/mm/cpu_entry_area.c             | 2 +-
 9 files changed, 18 insertions(+), 15 deletions(-)

-- 
2.35.3