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

[Paolo Bonzini <pbonzini@redhat.com>]

On 3/8/22 09:18, Wanpeng Li wrote:
> From: Wanpeng Li <wanpengli@tencent.com>
> 
> When the "nopv" command line parameter is used, it should not waste
> memory for kvmclock.
> 
> Signed-off-by: Wanpeng Li <wanpengli@tencent.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();

Perhaps instead !kvm_para_available() && nopv should clear the kvmclock 
variable?

Paolo