linux-kernel - [PATCH v2 9/9] KVM, VMX: Check for automatic switch msr table overflow.

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Message-Id: <1317816084-18026-10-git-send-email-gleb@redhat.com>
Date:	Wed,  5 Oct 2011 14:01:24 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	avi@...hat.com, kvm@...r.kernel.org, joerg.roedel@....com,
	mingo@...e.hu, a.p.zijlstra@...llo.nl
Subject: [PATCH v2 9/9] KVM, VMX: Check for automatic switch msr table overflow.


Signed-off-by: Gleb Natapov <gleb@...hat.com>
---
 arch/x86/kvm/vmx.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index d0d4afa..6e28d58 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1280,7 +1280,11 @@ static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
 		if (m->guest[i].index == msr)
 			break;
 
-	if (i == m->nr) {
+	if (i == NR_AUTOLOAD_MSRS) {
+		printk_once(KERN_WARNING"Not enough mst switch entries. "
+				"Can't add msr %x\n", msr);
+		return;
+	} else if (i == m->nr) {
 		++m->nr;
 		vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr);
 		vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr);
-- 
1.7.5.3

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