linux-kernel - Re: [PATCH kernel] KVM: PPC: Book3S HV: Make unique debugfs nodename

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Date:   Tue, 24 Aug 2021 18:37:25 +1000
From:   Alexey Kardashevskiy <aik@...abs.ru>
To:     Fabiano Rosas <farosas@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, kvm-ppc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, Paul Mackerras <paulus@...abs.org>
Subject: Re: [PATCH kernel] KVM: PPC: Book3S HV: Make unique debugfs nodename



On 18/08/2021 08:20, Fabiano Rosas wrote:
> Alexey Kardashevskiy <aik@...abs.ru> writes:
> 
>> On 07/07/2021 14:13, Alexey Kardashevskiy wrote:
> 
>> alternatively move this debugfs stuff under the platform-independent
>> directory, how about that?
> 
> That's a good idea. I only now realized we have two separate directories
> for the same guest:
> 
> $ ls /sys/kernel/debug/kvm/ | grep $pid
> 19062-11
> vm19062
> 
> Looks like we would have to implement kvm_arch_create_vcpu_debugfs for
> the vcpu information and add a similar hook for the vm.

Something like that. From the git history, it looks like the ppc folder 
was added first and then the generic kvm folder was added but apparently 
they did not notice the ppc one due to natural reasons :)

If you are not too busy, can you please merge the ppc one into the 
generic one and post the patch, so we won't need to fix these 
duplication warnings again? Thanks,



>>> ---
>>>    arch/powerpc/kvm/book3s_hv.c | 2 +-
>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
>>> index 1d1fcc290fca..0223ddc0eed0 100644
>>> --- a/arch/powerpc/kvm/book3s_hv.c
>>> +++ b/arch/powerpc/kvm/book3s_hv.c
>>> @@ -5227,7 +5227,7 @@ static int kvmppc_core_init_vm_hv(struct kvm *kvm)
>>>    	/*
>>>    	 * Create a debugfs directory for the VM
>>>    	 */
>>> -	snprintf(buf, sizeof(buf), "vm%d", current->pid);
>>> +	snprintf(buf, sizeof(buf), "vm%d-lp%ld", current->pid, lpid);
>>>    	kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir);
>>>    	kvmppc_mmu_debugfs_init(kvm);
>>>    	if (radix_enabled())
>>>

-- 
Alexey