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KVM: Disable pagefaults during copy_from_user_inatomic()
With CONFIG_PREEMPT=n, this is needed in order to disable the fault-in code from sleeping. Signed-off-by: Andrea Arcangeli <andrea@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
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@ -554,7 +554,9 @@ int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
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addr = gfn_to_hva(kvm, gfn);
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if (kvm_is_error_hva(addr))
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return -EFAULT;
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pagefault_disable();
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r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
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pagefault_enable();
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if (r)
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return -EFAULT;
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return 0;
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