Re: [PATCH-for-9.1 v2 08/21] target/i386/kvm: Remove x86_cpu_change_kvm_default() and 'kvm-cpu.h'

[Zhao Liu <zhao1.liu@intel.com>]

On Wed, Mar 27, 2024 at 10:51:10AM +0100, Philippe Mathieu-Daudé wrote:
> Date: Wed, 27 Mar 2024 10:51:10 +0100
> From: Philippe Mathieu-Daudé <philmd@linaro.org>
> Subject: [PATCH-for-9.1 v2 08/21] target/i386/kvm: Remove
>  x86_cpu_change_kvm_default() and 'kvm-cpu.h'
> X-Mailer: git-send-email 2.41.0
> 
> x86_cpu_change_kvm_default() was only used out of kvm-cpu.c by
> the pc-i440fx-2.1 machine, which got removed. Make it static,
> and remove its declaration. "kvm-cpu.h" is now empty, remove it.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> Message-Id: <20240305134221.30924-8-philmd@linaro.org>
> ---
>  target/i386/kvm/kvm-cpu.h | 41 ---------------------------------------
>  target/i386/kvm/kvm-cpu.c |  3 +--
>  2 files changed, 1 insertion(+), 43 deletions(-)
>  delete mode 100644 target/i386/kvm/kvm-cpu.h
> 
> diff --git a/target/i386/kvm/kvm-cpu.h b/target/i386/kvm/kvm-cpu.h
> deleted file mode 100644
> index e858ca21e5..0000000000
> --- a/target/i386/kvm/kvm-cpu.h
> +++ /dev/null
> @@ -1,41 +0,0 @@
> -/*
> - * i386 KVM CPU type and functions
> - *
> - *  Copyright (c) 2003 Fabrice Bellard
> - *
> - * This library is free software; you can redistribute it and/or
> - * modify it under the terms of the GNU Lesser General Public
> - * License as published by the Free Software Foundation; either
> - * version 2 of the License, or (at your option) any later version.
> - *
> - * This library is distributed in the hope that it will be useful,
> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> - * Lesser General Public License for more details.
> - *
> - * You should have received a copy of the GNU Lesser General Public
> - * License along with this library; if not, see <http://www.gnu.org/licenses/>.
> - */
> -
> -#ifndef KVM_CPU_H
> -#define KVM_CPU_H
> -
> -#ifdef CONFIG_KVM
> -/*
> - * Change the value of a KVM-specific default
> - *
> - * If value is NULL, no default will be set and the original
> - * value from the CPU model table will be kept.
> - *
> - * It is valid to call this function only for properties that
> - * are already present in the kvm_default_props table.
> - */
> -void x86_cpu_change_kvm_default(const char *prop, const char *value);

Features in kvm_default_props[] are supposed to be supported on the
oldest kernal version (v4.5, from docs/system/target-i386.rst).

So future PC machines will not use this interface to adjust
compatibility with the oldest v4.5 kernel. And it makes sense to stop
exposing this interface in the header. Thus,

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>