From: Jinhao Fan <fanjinhao21s@ict.ac.cn>
To: Klaus Jensen <its@irrelevant.dk>
Cc: qemu-devel@nongnu.org, kbusch@kernel.org, stefanha@gmail.com,
"open list:nvme" <qemu-block@nongnu.org>
Subject: Re: [PATCH v2 1/3] hw/nvme: support irq(de)assertion with eventfd
Date: Thu, 25 Aug 2022 19:16:04 +0800 [thread overview]
Message-ID: <7e5708c6-ffad-d867-a232-85ce55ee60b4@ict.ac.cn> (raw)
In-Reply-To: <YwdB//iV62uWeqJK@apples>
On 8/25/2022 5:33 PM, Klaus Jensen wrote:
> I'm still a bit perplexed by this issue, so I just tried moving
> nvme_init_irq_notifier() to the end of nvme_init_cq() and removing this
> first_io_cqe thing. I did not observe any particular issues?
>
> What bad behavior did you encounter, it seems to work fine to me
The kernel boots up and got stuck, waiting for interrupts. Then the
request times out and got retried three times. Finally the driver seems
to decide that the drive is down and continues to boot.
I added some prints during debugging and found that the MSI-X message
which got registered in KVM via kvm_irqchip_add_msi_route() is not the
same as the one actually used in msix_notify().
Are you sure you are using KVM's irqfd?
Here is a previous discussion with Keith [1].
[1]
https://lore.kernel.org/qemu-devel/YvKJk2dYiwomexFv@kbusch-mbp.dhcp.thefacebook.com/#t
next prev parent reply other threads:[~2022-08-25 11:18 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-25 7:47 [PATCH v2 0/3] hw/nvme: add irqfd support Jinhao Fan
2022-08-25 7:47 ` [PATCH v2 1/3] hw/nvme: support irq(de)assertion with eventfd Jinhao Fan
2022-08-25 9:33 ` Klaus Jensen
2022-08-25 11:16 ` Jinhao Fan [this message]
2022-08-25 11:56 ` Klaus Jensen
2022-08-25 12:38 ` Klaus Jensen
2022-08-25 13:09 ` Jinhao Fan
2022-08-25 13:59 ` Klaus Jensen
2022-08-25 14:11 ` Jinhao Fan
2022-08-25 14:05 ` Jinhao Fan
2022-08-25 7:47 ` [PATCH v2 2/3] hw/nvme: use KVM irqfd when available Jinhao Fan
2022-08-25 7:47 ` [PATCH v2 3/3] hw/nvme: add MSI-x mask handlers for irqfd Jinhao Fan
-- strict thread matches above, loose matches on Subject: below --
2022-08-26 15:12 [PATCH v2 0/3] iothread and irqfd support Jinhao Fan
2022-08-26 15:12 ` [PATCH v2 1/3] hw/nvme: support irq(de)assertion with eventfd Jinhao Fan
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