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

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Message-ID: <20240323080541.10047-2-pmenzel@molgen.mpg.de>
Date: Sat, 23 Mar 2024 09:05:42 +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@...el.com>,
	Paul Menzel <pmenzel@...gen.mpg.de>,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] KVM: VMX: make vmx_init a late init call to get to init process faster

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);
-- 
2.43.0