linux-kernel - Re: [PATCH] virt/kvm: change kvm_assign_device() to print return value when iommu_attach

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Date:	Wed, 10 Oct 2012 12:20:56 -0600
From:	Shuah Khan <shuahkhan@...il.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	Shuah Khan <shuah.khan@...com>, avi@...hat.com,
	kvm@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] virt/kvm: change kvm_assign_device() to print return
 value when iommu_attach_device() fails

On Wed, Oct 10, 2012 at 10:51 AM, Marcelo Tosatti <mtosatti@...hat.com> wrote:
> On Mon, Oct 08, 2012 at 06:36:11PM -0600, Shuah Khan wrote:
>> Change existing kernel error message to include return value from
>> iommu_attach_device() when it fails. This will help debug device
>> assignment failures more effectively.
>>
>> Signed-off-by: Shuah Khan <shuah.khan@...com>
>> ---
>>  virt/kvm/iommu.c |    6 +-----
>>  1 file changed, 1 insertion(+), 5 deletions(-)
>>
>> diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
>> index 037cb67..18e1e30 100644
>> --- a/virt/kvm/iommu.c
>> +++ b/virt/kvm/iommu.c
>> @@ -168,11 +168,7 @@ int kvm_assign_device(struct kvm *kvm,
>>
>>       r = iommu_attach_device(domain, &pdev->dev);
>>       if (r) {
>> -             printk(KERN_ERR "assign device %x:%x:%x.%x failed",
>> -                     pci_domain_nr(pdev->bus),
>> -                     pdev->bus->number,
>> -                     PCI_SLOT(pdev->devfn),
>> -                     PCI_FUNC(pdev->devfn));
>> +             dev_err(&pdev->dev, "kvm assign device failed ret %d", r);
>>               return r;
>>       }
>
> Why removal of domain,bus,slot,func from the message?
>

dev_err() includes that information like this:

pci 0000:00:1d.0: assign device failed ret 0

Without the removal of domain,bus,slot,func from the message:

It will look like:

pci 0000:00:1d.0: assign device 0:0:1d.0 failed ret 0

Initially I left it in there and after testing, realized it is
duplicate information and decided to remove it.

-- Shuah
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