linux-kernel - Re: SCSI hotplug issues with UEFI VM with guest kernel >= 6.5

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Message-ID: <c6233df5-01d8-498f-8235-ce4b102a2e91@proxmox.com>
Date:   Mon, 11 Dec 2023 14:52:42 +0100
From:   Fiona Ebner <f.ebner@...xmox.com>
To:     Igor Mammedov <imammedo@...hat.com>,
        Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, bhelgaas@...gle.com, lenb@...nel.org,
        rafael@...nel.org, Thomas Lamprecht <t.lamprecht@...xmox.com>
Subject: Re: SCSI hotplug issues with UEFI VM with guest kernel >= 6.5

Am 11.12.23 um 08:46 schrieb Igor Mammedov:
> On Fri, 8 Dec 2023 16:47:23 +0100
> Igor Mammedov <imammedo@...hat.com> wrote:
> 
>> On Thu, 7 Dec 2023 17:28:15 -0600
>> Bjorn Helgaas <helgaas@...nel.org> wrote:
>>
>>>
>>> What's the actual symptom that this is broken?  All these log
>>> fragments show the exact same assignments for BARs 0, 1, 4 and for the
>>> bridge windows.
>>>

The disk never shows up in /dev

>>> I assume 0000:01:02.0 is the hot-added SCSI HBA, and 00:05.0 is a
>>> bridge leading to it?
>>>
>>> Can you put the complete dmesg logs somewhere?  There's a lot of
>>> context missing here.
>>>

Is this still necessary with Igor being able to reproduce the issue?

>>> Do you have to revert both cc22522fd55e2 and 40613da52b13f to make it
>>> work reliably?  If we have to revert something, reverting one would be
>>> better than reverting both.  
>>

Just reverting cc22522fd55e2 is not enough (and cc22522fd55e2 fixes
40613da52b13f so I can't revert just 40613da52b13f).

> 
> Fiona,
> 
> Does it help if you use q35 machine with '-global ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off' option?
> 

Yes, it does :)

I added the following to my QEMU commandline (first line, because there
wouldn't be a "pci.0" otherwise):

> -device 'pci-bridge,id=pci.0,chassis_nr=4' \
> -machine 'q35' \
> -global 'ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off' \

and while it takes a few seconds, the disk does show up successfully:

> Dec 11 13:07:32 hotplug kernel: shpchp 0000:01:05.0: Latch close on Slot(2-1)
> Dec 11 13:07:32 hotplug kernel: shpchp 0000:01:05.0: Button pressed on Slot(2-1)
> Dec 11 13:07:32 hotplug kernel: shpchp 0000:01:05.0: Card present on Slot(2-1)
> Dec 11 13:07:32 hotplug kernel: shpchp 0000:01:05.0: PCI slot #2-1 - powering on due to button press
> Dec 11 13:07:38 hotplug kernel: pci 0000:02:02.0: [1af4:1004] type 00 class 0x010000
> Dec 11 13:07:38 hotplug kernel: pci 0000:02:02.0: reg 0x10: [io  0x0000-0x003f]
> Dec 11 13:07:38 hotplug kernel: pci 0000:02:02.0: reg 0x14: [mem 0x00000000-0x00000fff]
> Dec 11 13:07:38 hotplug kernel: pci 0000:02:02.0: reg 0x20: [mem 0x00000000-0x00003fff 64bit pref]
> Dec 11 13:07:38 hotplug kernel: pci 0000:02:02.0: BAR 4: assigned [mem 0xc040004000-0xc040007fff 64bit pref]
> Dec 11 13:07:38 hotplug kernel: pci 0000:02:02.0: BAR 1: assigned [mem 0xc1401000-0xc1401fff]
> Dec 11 13:07:38 hotplug kernel: pci 0000:02:02.0: BAR 0: assigned [io  0x8040-0x807f]
> Dec 11 13:07:38 hotplug kernel: shpchp 0000:01:05.0: PCI bridge to [bus 02]
> Dec 11 13:07:38 hotplug kernel: shpchp 0000:01:05.0:   bridge window [io  0x8000-0x8fff]
> Dec 11 13:07:38 hotplug kernel: shpchp 0000:01:05.0:   bridge window [mem 0xc1400000-0xc15fffff]
> Dec 11 13:07:38 hotplug kernel: shpchp 0000:01:05.0:   bridge window [mem 0xc040000000-0xc05fffffff 64bit pref]
> Dec 11 13:07:38 hotplug kernel: virtio-pci 0000:02:02.0: enabling device (0000 -> 0003)
> Dec 11 13:07:38 hotplug kernel: scsi host7: Virtio SCSI HBA
> Dec 11 13:07:38 hotplug kernel: scsi 7:0:0:1: Direct-Access     QEMU     QEMU HARDDISK    2.5+ PQ: 0 ANSI: 5
> Dec 11 13:07:38 hotplug kernel: sd 7:0:0:1: Attached scsi generic sg1 type 0
> Dec 11 13:07:38 hotplug kernel: sd 7:0:0:1: Power-on or device reset occurred
> Dec 11 13:07:38 hotplug kernel: sd 7:0:0:1: [sdb] 2048 512-byte logical blocks: (1.05 MB/1.00 MiB)
> Dec 11 13:07:38 hotplug kernel: sd 7:0:0:1: [sdb] Write Protect is off
> Dec 11 13:07:38 hotplug kernel: sd 7:0:0:1: [sdb] Mode Sense: 63 00 00 08
> Dec 11 13:07:38 hotplug kernel: sd 7:0:0:1: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> Dec 11 13:07:38 hotplug kernel: sd 7:0:0:1: [sdb] Attached SCSI disk

Best Regards,
Fiona