linux-kernel - [PATCH 4/9] KVM: SVM: Intercept RDPMC

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Date:	Thu,  3 Nov 2011 14:31:33 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	kvm@...r.kernel.org
Cc:	avi@...hat.com, mtosatti@...hat.com, linux-kernel@...r.kernel.org,
	mingo@...e.hu, a.p.zijlstra@...llo.nl, acme@...stprotocols.net
Subject: [PATCH 4/9] KVM: SVM: Intercept RDPMC

From: Avi Kivity <avi@...hat.com>

Intercept RDPMC and forward it to the PMU emulation code.

Signed-off-by: Avi Kivity <avi@...hat.com>
Signed-off-by: Gleb Natapov <gleb@...hat.com>
---
 arch/x86/kvm/svm.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index e32243e..5fa553b 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1014,6 +1014,7 @@ static void init_vmcb(struct vcpu_svm *svm)
 	set_intercept(svm, INTERCEPT_NMI);
 	set_intercept(svm, INTERCEPT_SMI);
 	set_intercept(svm, INTERCEPT_SELECTIVE_CR0);
+	set_intercept(svm, INTERCEPT_RDPMC);
 	set_intercept(svm, INTERCEPT_CPUID);
 	set_intercept(svm, INTERCEPT_INVD);
 	set_intercept(svm, INTERCEPT_HLT);
@@ -2770,6 +2771,19 @@ static int emulate_on_interception(struct vcpu_svm *svm)
 	return emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE;
 }
 
+static int rdpmc_interception(struct vcpu_svm *svm)
+{
+	int err;
+
+	if (!static_cpu_has(X86_FEATURE_NRIPS))
+		return emulate_on_interception(svm);
+
+	err = kvm_rdpmc(&svm->vcpu);
+	kvm_complete_insn_gp(&svm->vcpu, err);
+
+	return 1;
+}
+
 bool check_selective_cr0_intercepted(struct vcpu_svm *svm, unsigned long val)
 {
 	unsigned long cr0 = svm->vcpu.arch.cr0;
@@ -3190,6 +3204,7 @@ static int (*svm_exit_handlers[])(struct vcpu_svm *svm) = {
 	[SVM_EXIT_SMI]				= nop_on_interception,
 	[SVM_EXIT_INIT]				= nop_on_interception,
 	[SVM_EXIT_VINTR]			= interrupt_window_interception,
+	[SVM_EXIT_RDPMC]			= rdpmc_interception,
 	[SVM_EXIT_CPUID]			= cpuid_interception,
 	[SVM_EXIT_IRET]                         = iret_interception,
 	[SVM_EXIT_INVD]                         = emulate_on_interception,
-- 
1.7.5.3

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