linux-kernel - [PATCH] x86: svm: make wbinvd faster

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Message-ID: <20150228001917.15247.41063.stgit@joelvmguard2.amd.com>
Date:	Fri, 27 Feb 2015 18:19:18 -0600
From:	Joel Schopp <joel.schopp@....com>
To:	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>, <kvm@...r.kernel.org>
CC:	David Kaplan <David.Kaplan@....com>,
	David Kaplan <david.kaplan@....com>, <rkrcmar@...hat.com>,
	Joerg Roedel <joro@...tes.org>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	<linux-kernel@...r.kernel.org>, Borislav Petkov <bp@...en8.de>
Subject: [PATCH] x86: svm: make wbinvd faster

From: David Kaplan <David.Kaplan@....com>
No need to re-decode WBINVD since we know what it is from the intercept.

Signed-off-by: David Kaplan <David.Kaplan@....com>
[extracted from larger unlrelated patch, forward ported, tested]
Signed-off-by: Joel Schopp <joel.schopp@....com>
---
 arch/x86/kvm/svm.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index d319e0c..86ecd21 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2776,6 +2776,14 @@ static int skinit_interception(struct vcpu_svm *svm)
 	return 1;
 }
 
+static int wbinvd_interception(struct vcpu_svm *svm)
+{
+	kvm_emulate_wbinvd(&svm->vcpu);
+	skip_emulated_instruction(&svm->vcpu);
+	return 1;
+}
+
+
 static int xsetbv_interception(struct vcpu_svm *svm)
 {
 	u64 new_bv = kvm_read_edx_eax(&svm->vcpu);
@@ -3376,7 +3384,7 @@ static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
 	[SVM_EXIT_STGI]				= stgi_interception,
 	[SVM_EXIT_CLGI]				= clgi_interception,
 	[SVM_EXIT_SKINIT]			= skinit_interception,
-	[SVM_EXIT_WBINVD]                       = emulate_on_interception,
+	[SVM_EXIT_WBINVD]                       = wbinvd_interception,
 	[SVM_EXIT_MONITOR]			= monitor_interception,
 	[SVM_EXIT_MWAIT]			= mwait_interception,
 	[SVM_EXIT_XSETBV]			= xsetbv_interception,

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