linux-kernel - Re: [PATCH] x86/kvm: Don't waste kvmclock memory if there is nopv parameter

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Date:   Fri, 8 Apr 2022 15:44:11 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>, kvm <kvm@...r.kernel.org>
Cc:     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>
Subject: Re: [PATCH] x86/kvm: Don't waste kvmclock memory if there is nopv parameter

ping,
On Tue, 8 Mar 2022 at 16:19, Wanpeng Li <kernellwp@...il.com> wrote:
>
> From: Wanpeng Li <wanpengli@...cent.com>
>
> When the "nopv" command line parameter is used, it should not waste
> memory for kvmclock.
>
> Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
> ---
>  arch/x86/kernel/kvmclock.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
> index c5caa73..16333ba 100644
> --- a/arch/x86/kernel/kvmclock.c
> +++ b/arch/x86/kernel/kvmclock.c
> @@ -239,7 +239,7 @@ static void __init kvmclock_init_mem(void)
>
>  static int __init kvm_setup_vsyscall_timeinfo(void)
>  {
> -       if (!kvm_para_available() || !kvmclock)
> +       if (!kvm_para_available() || !kvmclock || nopv)
>                 return 0;
>
>         kvmclock_init_mem();
> --
> 2.7.4
>