linux-kernel - Re: [PATCH v2 1/2] x86: make VMware support optional

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Date:   Wed, 2 Dec 2020 13:59:02 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     "Enrico Weigelt, metux IT consult" <info@...ux.net>,
        linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        hpa@...or.com, dmitry.torokhov@...il.com, derek.kiernan@...inx.com,
        dragan.cvetic@...inx.com, richardcochran@...il.com,
        linux-hyperv@...r.kernel.org, linux-input@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v2 1/2] x86: make VMware support optional

On 12/2/20 1:19 PM, Enrico Weigelt, metux IT consult wrote:
> Make it possible to opt-out from VMware support, for minimized kernels
> that never will be run under Vmware (eg. high-density virtualization
> or embedded systems).
> 
> Average distro kernel will leave it on, therefore default to y.
> 
> Signed-off-by: Enrico Weigelt <info@...ux.net>
> ---
>  arch/x86/Kconfig                 | 11 +++++++++++
>  arch/x86/kernel/cpu/Makefile     |  4 +++-
>  arch/x86/kernel/cpu/hypervisor.c |  2 ++
>  drivers/input/mouse/Kconfig      |  2 +-
>  drivers/misc/Kconfig             |  2 +-
>  drivers/ptp/Kconfig              |  2 +-
>  6 files changed, 19 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index f6946b81f74a..eff12460cb3c 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -801,6 +801,17 @@ config X86_HV_CALLBACK_VECTOR
>  
>  source "arch/x86/xen/Kconfig"
>  
> +config VMWARE_GUEST
> +	bool "VMware Guest support"
> +	default y
> +	help
> +	  This option enables several optimizations for running under the
> +	  VMware hypervisor.
> +
> +	  Disabling it saves a few kb, for stripped down kernels eg. in high

	                           kB or KiB or even KB, but not kb
	                                                         e.g.

> +	  density virtualization or embedded systems running (para)virtualized
> +	  workloads.
> +
>  config KVM_GUEST
>  	bool "KVM Guest support (including kvmclock)"
>  	depends on PARAVIRT


-- 
~Randy