linux-kernel - [196/200] KVM: x86: Add missing locking to arch specific vcpu ioctls

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Message-Id: <20100701174303.058796070@clark.site>
Date:	Thu, 01 Jul 2010 10:44:46 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Avi Kivity <avi@...hat.com>
Subject: [196/200] KVM: x86: Add missing locking to arch specific vcpu ioctls

2.6.34-stable review patch.  If anyone has any objections, please let me know.

------------------

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

Signed-off-by: Avi Kivity <avi@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

(Cherry-picked from commit 8fbf065d625617bbbf6b72d5f78f84ad13c8b547)
---
 arch/x86/kvm/x86.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1776,6 +1776,7 @@ static int kvm_vcpu_ioctl_get_cpuid2(str
 {
 	int r;
 
+	vcpu_load(vcpu);
 	r = -E2BIG;
 	if (cpuid->nent < vcpu->arch.cpuid_nent)
 		goto out;
@@ -1787,6 +1788,7 @@ static int kvm_vcpu_ioctl_get_cpuid2(str
 
 out:
 	cpuid->nent = vcpu->arch.cpuid_nent;
+	vcpu_put(vcpu);
 	return r;
 }
 
@@ -2042,6 +2044,7 @@ static int kvm_vcpu_ioctl_x86_setup_mce(
 	int r;
 	unsigned bank_num = mcg_cap & 0xff, bank;
 
+	vcpu_load(vcpu);
 	r = -EINVAL;
 	if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
 		goto out;
@@ -2056,6 +2059,7 @@ static int kvm_vcpu_ioctl_x86_setup_mce(
 	for (bank = 0; bank < bank_num; bank++)
 		vcpu->arch.mce_banks[bank*4] = ~(u64)0;
 out:
+	vcpu_put(vcpu);
 	return r;
 }
 
@@ -2323,7 +2327,9 @@ long kvm_arch_vcpu_ioctl(struct file *fi
 		r = -EFAULT;
 		if (copy_from_user(&mce, argp, sizeof mce))
 			goto out;
+		vcpu_load(vcpu);
 		r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
+		vcpu_put(vcpu);
 		break;
 	}
 	case KVM_GET_VCPU_EVENTS: {


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