[v2,1/3] KVM: fix rcu usage warning in kvm_arch_vcpu_ioctl_set_sregs()

Commit Message

Xiao Guangrong Jan. 7, 2011, 7:46 a.m. UTC

None

Patch

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index fa708c9..0b77e9c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5571,7 +5571,7 @@  int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 				  struct kvm_sregs *sregs)
 {
 	int mmu_reset_needed = 0;
-	int pending_vec, max_bits;
+	int pending_vec, max_bits, idx;
 	struct desc_ptr dt;
 
 	dt.size = sregs->idt.limit;
@@ -5600,10 +5600,13 @@  int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 	kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
 	if (sregs->cr4 & X86_CR4_OSXSAVE)
 		update_cpuid(vcpu);
+
+	idx = srcu_read_lock(&vcpu->kvm->srcu);
 	if (!is_long_mode(vcpu) && is_pae(vcpu)) {
 		load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
 		mmu_reset_needed = 1;
 	}
+	srcu_read_unlock(&vcpu->kvm->srcu, idx);
 
 	if (mmu_reset_needed)
 		kvm_mmu_reset_context(vcpu);