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

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Date:   Tue, 17 Aug 2021 19:20:57 -0300
From:   Fabiano Rosas <farosas@...ux.ibm.com>
To:     Alexey Kardashevskiy <aik@...abs.ru>,
        Paul Mackerras <paulus@...abs.org>
Cc:     linux-kernel@...r.kernel.org, kvm-ppc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH kernel] KVM: PPC: Book3S HV: Make unique debugfs nodename

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.

>> ---
>>   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())
>>