linux-kernel - [PATCH 20/40] KVM: SVM: move feature detection to hardware setup code

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Message-Id: <1206974244-9716-21-git-send-email-avi@qumranet.com>
Date:	Mon, 31 Mar 2008 17:37:04 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 20/40] KVM: SVM: move feature detection to hardware setup code

From: Joerg Roedel <joerg.roedel@....com>

By moving the SVM feature detection from the each_cpu code to the hardware
setup code it runs only once. As an additional advance the feature check is now
available earlier in the module setup process.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
Signed-off-by: Avi Kivity <avi@...ranet.com>
---
 arch/x86/kvm/svm.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index ff3bc74..5f527dc 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -302,7 +302,6 @@ static void svm_hardware_enable(void *garbage)
 	svm_data->asid_generation = 1;
 	svm_data->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1;
 	svm_data->next_asid = svm_data->max_asid + 1;
-	svm_features = cpuid_edx(SVM_CPUID_FUNC);
 
 	asm volatile ("sgdt %0" : "=m"(gdt_descr));
 	gdt = (struct desc_struct *)gdt_descr.address;
@@ -411,6 +410,9 @@ static __init int svm_hardware_setup(void)
 		if (r)
 			goto err_2;
 	}
+
+	svm_features = cpuid_edx(SVM_CPUID_FUNC);
+
 	return 0;
 
 err_2:
-- 
1.5.4.5

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