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kvm: take srcu lock around kvm_steal_time_set_preempted()

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kvm_memslots() will be called by kvm_write_guest_offset_cached() so
take the srcu lock.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Andrea Arcangeli 2016-12-17 19:13:32 +01:00 committed by Paolo Bonzini
parent 931f261b42
commit cc0d907c09
1 changed files with 7 additions and 0 deletions
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7
arch/x86/kvm/x86.c
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@ -2844,6 +2844,7 @@ static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu)
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
int idx;
/*
* Disable page faults because we're in atomic context here.
* kvm_write_guest_offset_cached() would call might_fault()
@ -2853,7 +2854,13 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
* paging.
*/
pagefault_disable();
/*
* kvm_memslots() will be called by
* kvm_write_guest_offset_cached() so take the srcu lock.
*/
idx = srcu_read_lock(&vcpu->kvm->srcu);
kvm_steal_time_set_preempted(vcpu);
srcu_read_unlock(&vcpu->kvm->srcu, idx);
pagefault_enable();
kvm_x86_ops->vcpu_put(vcpu);
kvm_put_guest_fpu(vcpu);