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Re: [Qemu-devel] [PATCH] s390-ccw.img: Fix waiting for virtio processing
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH] s390-ccw.img: Fix waiting for virtio processing. |
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Date: |
Fri, 30 Aug 2013 10:38:35 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130805 Thunderbird/17.0.8 |
Il 30/08/2013 09:59, Cornelia Huck ha scritto:
> + vr->used_idx = vr->used->idx;
> + /*
> + * Wait until the used index has moved.
> + * Note: This is only race-free if the host doesn't start draining
> + * the queue out of its own accord.
> + */
> + while (vr->used->idx == vr->used_idx) {
Can you instead initialize vr->used_idx in virtio_setup_block, and then
update it _after_ the while loop? This would be race-free.
Paolo