Re: ata driver loading hang on qemu/kvm

Re: ata driver loading hang on qemu/kvm

[Suresh Gumpula]

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From: Suresh Gumpula <suresh.gumpula@nutanix.com>
Date: Sunday, April 5, 2020 at 1:40 PM
To: "kvm@vger.kernel.org" <kvm@vger.kernel.org>, "pbonzini@redhat.com" <pbonzini@redhat.com>
Subject: Re: ata driver loading hang on qemu/kvm

The guest kernel(not a nested guest) boot iso is hanging with following errors.
[    1.414035] Write protecting the kernel read-only data: 6144k
[    1.418006] Freeing unused kernel memory: 1080K
[    1.423033] Freeing unused kernel memory: 1004K
[    1.466783] scsi host0: ata_piix
[    1.469539] scsi host1: ata_piix
[    1.472039] ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xc300 irq 14
[    1.475740] ata2: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xc308 irq 15
 
 
We have enabled nested host, but not running any nested guests.  So it’s a regular guest VM on a host.
Can someone please guide me what could be wrong here.  Is it a known issue in the kvm module or qemu emulation of IDE/CDROM controller?
 
 
Thanks,
Suresh
 
 
From: Suresh Gumpula <suresh.gumpula@nutanix.com>
Date: Sunday, April 5, 2020 at 1:35 PM
To: "kvm@vger.kernel.org" <kvm@vger.kernel.org>, "pbonzini@redhat.com" <pbonzini@redhat.com>
Subject: ata driver loading hang on qemu/kvm
 
Hi,
 
Hope you are doing great.  I am seeing this old problem with qemu 2.12/kernel 4.19.84(intel kvm with nesting enabled) and guest kernel 4.10
 
https://bugzilla.redhat.com/show_bug.cgi?id=1345964
 
Could you please advise me on this?  I am seeing the exact same problem where the ata driver load was stuck.
Really appreciate if you could give some pointers?
 
Thanks,
Suresh
 
 

Re: ata driver loading hang on qemu/kvm

[Paolo Bonzini]

On 05/04/20 22:46, Suresh Gumpula wrote:
> 
> 
> From: Suresh Gumpula <suresh.gumpula@nutanix.com>
> Date: Sunday, April 5, 2020 at 1:40 PM
> To: "kvm@vger.kernel.org" <kvm@vger.kernel.org>, "pbonzini@redhat.com" <pbonzini@redhat.com>
> Subject: Re: ata driver loading hang on qemu/kvm
> 
> The guest kernel(not a nested guest) boot iso is hanging with following errors.
> [    1.414035] Write protecting the kernel read-only data: 6144k
> [    1.418006] Freeing unused kernel memory: 1080K
> [    1.423033] Freeing unused kernel memory: 1004K
> [    1.466783] scsi host0: ata_piix
> [    1.469539] scsi host1: ata_piix
> [    1.472039] ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xc300 irq 14
> [    1.475740] ata2: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xc308 irq 15
>  
>  
> We have enabled nested host, but not running any nested guests.  So it’s a regular guest VM on a host.
> Can someone please guide me what could be wrong here.  Is it a known issue in the kvm module or qemu emulation of IDE/CDROM controller?

No, it's the first time I see this reported.  Please try with a newer
QEMU version.

Paolo