linux-kernel - Re: [PATCH v3 4/7] KVM: X86: Introduce mmu_rmaps

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Date:   Thu, 5 Aug 2021 18:19:41 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Peter Xu <peterx@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: Re: [PATCH v3 4/7] KVM: X86: Introduce mmu_rmaps_stat per-vm debugfs
 file

On Mon, Aug 02, 2021, Paolo Bonzini wrote:
> On 31/07/21 00:04, Peter Xu wrote:
> > Use this file to dump rmap statistic information.  The statistic is done by
> > calculating the rmap count and the result is log-2-based.
> > 
> > An example output of this looks like (idle 6GB guest, right after boot linux):
> > 
> > Rmap_Count:     0       1       2-3     4-7     8-15    16-31   32-63   64-127  128-255 256-511 512-1023
> > Level=4K:       3086676 53045   12330   1272    502     121     76      2       0       0       0
> > Level=2M:       5947    231     0       0       0       0       0       0       0       0       0
> > Level=1G:       32      0       0       0       0       0       0       0       0       0       0
> > 
> > Signed-off-by: Peter Xu <peterx@...hat.com>
> > ---
> >   arch/x86/kvm/x86.c | 113 +++++++++++++++++++++++++++++++++++++++++++++
> >   1 file changed, 113 insertions(+)
> 
> This should be in debugfs.c, meaning that the kvm_mmu_slot_lpages() must be
> in a header.  I think mmu.h should do, let me take a look and I can post
> myself a v4 of these debugfs parts.

When you do post v4, don't forget to include both mmu.h and mmu/mmu_internal.h. :-)
kvm/queue is still broken...

arch/x86/kvm/debugfs.c: In function ‘kvm_mmu_rmaps_stat_show’:
arch/x86/kvm/debugfs.c:115:18: error: implicit declaration of function ‘kvm_mmu_slot_lpages’;
  115 |     lpage_size = kvm_mmu_slot_lpages(slot, k + 1);
      |                  ^~~~~~~~~~~~~~~~~~~
      |                  kvm_mmu_gfn_allow_lpage