lkml.org 
[lkml]   [2021]   [Jul]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH kernel] KVM: PPC: Book3S HV: Make unique debugfs nodename
Date
Alexey Kardashevskiy <aik@ozlabs.ru> writes:

> Currently it is vm-$currentpid which works as long as there is just one
> VM per the userspace (99.99% cases) but produces a bunch
> of "debugfs: Directory 'vm16679' with parent 'kvm' already present!"
> when syzkaller (syscall fuzzer) is running so only one VM is present in
> the debugfs for a given process.
>
> This changes the debugfs node to include the LPID which alone should be
> system wide unique. This leaves the existing pid for the convenience of
> matching the VM's debugfs with the running userspace process (QEMU).
>
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>

Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>

> ---
> 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())

\
 
 \ /
  Last update: 2021-07-07 19:50    [W:0.106 / U:2.408 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site