linux-kernel - Re: [PATCH] KVM: VMX: make vmx_init a late init call to get to init process faster

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Message-ID: <c5a4ce3a-6c0e-43c8-a3f8-1b291acb114d@molgen.mpg.de>
Date: Sat, 23 Mar 2024 09:14:51 +0100
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Sean Christopherson <seanjc@...gle.com>,
 Paolo Bonzini <pbonzini@...hat.com>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
 "H. Peter Anvin" <hpa@...or.com>
Cc: Colin Ian King <colin.i.king@...il.com>, kvm@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: VMX: make vmx_init a late init call to get to init
 process faster

[CC: Update Colin’s address.]

Am 23.03.24 um 09:05 schrieb Paul Menzel:
> From: Colin Ian King <colin.i.king@...el.com>
> 
> Making vmx_init a late initcall improves QEMU kernel boot times to
> get to the init process. Average of 100 boots, QEMU boot average
> reduced from 0.776 seconds to 0.622 seconds (~19.8% faster) on
> Alder Lake i9-12900 and ~0.5% faster for non-QEMU UEFI boots.
> 
> Signed-off-by: Colin Ian King <colin.i.king@...el.com>
> [Take patch
> https://github.com/clearlinux-pkgs/linux/commit/797db35496031b19ba37b1639ac5fa5db9159a06
> and fix spelling of Alder Lake.]
> Signed-off-by: Paul Menzel <pmenzel@...gen.mpg.de>
> ---
>   arch/x86/kvm/vmx/vmx.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index c37a89eda90f..0a9f4b20fbda 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -8783,4 +8783,4 @@ static int __init vmx_init(void)
>   	kvm_x86_vendor_exit();
>   	return r;
>   }
> -module_init(vmx_init);
> +late_initcall(vmx_init)