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Re: [Qemu-devel] [PATCH] block/nvme: call blk_drain in NVMe reset code t
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH] block/nvme: call blk_drain in NVMe reset code to avoid lockups |
Date: |
Tue, 20 Nov 2018 18:52:33 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0 |
On 20/11/18 18:31, Igor Druzhinin wrote:
> On 14/11/2018 17:42, Igor Druzhinin wrote:
>> On 06/11/2018 12:16, Igor Druzhinin wrote:
>>> When blk_flush called in NVMe reset path S/C queues are already freed
>>> which means that re-entering AIO handling loop having some IO requests
>>> unfinished will lockup or crash as their SG structures being potentially
>>> reused. Call blk_drain before freeing the queues to avoid this nasty
>>> scenario.
>>>
>>> Signed-off-by: Igor Druzhinin <address@hidden>
>>> ---
>>> hw/block/nvme.c | 2 ++
>>> 1 file changed, 2 insertions(+)
>>>
>>> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
>>> index fc7dacb..cdf836e 100644
>>> --- a/hw/block/nvme.c
>>> +++ b/hw/block/nvme.c
>>> @@ -797,6 +797,8 @@ static void nvme_clear_ctrl(NvmeCtrl *n)
>>> {
>>> int i;
>>>
>>> + blk_drain(n->conf.blk);
>>> +
>>> for (i = 0; i < n->num_queues; i++) {
>>> if (n->sq[i] != NULL) {
>>> nvme_free_sq(n->sq[i], n);
>>>
>>
>> ping?
>>
>
> CC: Paolo Bonzini <address@hidden>
>
Looks good to me. Kevin, Max?
Paolo