From: Lukas Wunner <lukas@wunner.de>
To: Robin Murphy <robin.murphy@arm.com>
Cc: Ethan Zhao <haifeng.zhao@linux.intel.com>,
bhelgaas@google.com, baolu.lu@linux.intel.com,
dwmw2@infradead.org, will@kernel.org, linux-pci@vger.kernel.org,
iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
Haorong Ye <yehaorong@bytedance.com>
Subject: Re: [PATCH 2/2] iommu/vt-d: don's issue devTLB flush request when device is disconnected
Date: Thu, 21 Dec 2023 11:42:54 +0100 [thread overview]
Message-ID: <20231221104254.GB12714@wunner.de> (raw)
In-Reply-To: <3b7742c4-bbae-4a78-a5a6-30df936a17d4@arm.com>
On Wed, Dec 13, 2023 at 11:54:05AM +0000, Robin Murphy wrote:
> I think if we want to ensure ATCs are invalidated on hot-unplug we need an
> additional pre-removal notifier to take care of that, and that step would
> then want to distinguish between an orderly removal where cleaning up is
> somewhat meaningful, and a surprise removal where it definitely isn't.
Even if a user starts the process for orderly removal, the device may be
surprise-removed *during* that process. So we cannot assume that the
device is actually accessible if orderly removal has been initiated.
If the form factor supports surprise removal, the device may be gone
at any time.
Thanks,
Lukas
next prev parent reply other threads:[~2023-12-21 10:43 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-13 3:46 [PATCH RFC 0/2] fix vt-d hard lockup when hotplug ATS capable device Ethan Zhao
2023-12-13 3:46 ` [PATCH 1/2] PCI: make pci_dev_is_disconnected() helper public for other drivers Ethan Zhao
2023-12-13 10:49 ` Lukas Wunner
2023-12-14 0:58 ` Ethan Zhao
2023-12-21 10:51 ` Lukas Wunner
2023-12-22 2:35 ` Ethan Zhao
2023-12-13 3:46 ` [PATCH 2/2] iommu/vt-d: don's issue devTLB flush request when device is disconnected Ethan Zhao
2023-12-13 10:44 ` Lukas Wunner
2023-12-13 11:54 ` Robin Murphy
2023-12-14 2:40 ` Ethan Zhao
2023-12-21 10:42 ` Lukas Wunner [this message]
2023-12-21 11:01 ` Robin Murphy
2023-12-21 11:07 ` Lukas Wunner
2023-12-22 3:20 ` Ethan Zhao
2023-12-14 2:16 ` Ethan Zhao
2023-12-15 0:43 ` Ethan Zhao
2023-12-13 11:59 ` Baolu Lu
2023-12-14 2:26 ` Ethan Zhao
2023-12-15 1:03 ` Ethan Zhao
2023-12-15 1:34 ` Baolu Lu
2023-12-15 1:51 ` Ethan Zhao
-- strict thread matches above, loose matches on Subject: below --
2023-12-20 0:51 [PATCH v4 0/2] fix vt-d hard lockup when hotplug ATS capable device Ethan Zhao
2023-12-20 0:51 ` [PATCH v4 1/2] PCI: make pci_dev_is_disconnected() helper public for other drivers Ethan Zhao
2023-12-20 0:51 ` [PATCH v4 2/2] iommu/vt-d: don's issue devTLB flush request when device is disconnected Ethan Zhao
2023-12-21 10:39 ` Lukas Wunner
2023-12-21 11:01 ` Lukas Wunner
2023-12-22 2:08 ` Ethan Zhao
2023-12-22 3:56 ` Ethan Zhao
2023-12-22 1:56 ` Ethan Zhao
2023-12-22 8:14 ` Lukas Wunner
2023-12-22 9:01 ` Ethan Zhao
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