linux-kernel - Re: [PATCH 1/7] KVM: MMU: update the documentation for reverse mapping of parent

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Date:	Wed, 19 Jun 2013 12:32:54 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC:	gleb@...hat.com, avi.kivity@...il.com, mtosatti@...hat.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 1/7] KVM: MMU: update the documentation for reverse mapping
 of parent_pte

Il 19/06/2013 11:09, Xiao Guangrong ha scritto:
> Update the document to match the current reverse mapping of
> parent_pte
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
> ---
>  Documentation/virtual/kvm/mmu.txt | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/virtual/kvm/mmu.txt b/Documentation/virtual/kvm/mmu.txt
> index 43fcb76..869abcc 100644
> --- a/Documentation/virtual/kvm/mmu.txt
> +++ b/Documentation/virtual/kvm/mmu.txt
> @@ -191,12 +191,12 @@ Shadow pages contain the following information:
>      A counter keeping track of how many hardware registers (guest cr3 or
>      pdptrs) are now pointing at the page.  While this counter is nonzero, the
>      page cannot be destroyed.  See role.invalid.
> -  multimapped:
> -    Whether there exist multiple sptes pointing at this page.
> -  parent_pte/parent_ptes:
> -    If multimapped is zero, parent_pte points at the single spte that points at
> -    this page's spt.  Otherwise, parent_ptes points at a data structure
> -    with a list of parent_ptes.
> +  parent_ptes:
> +    The reverse mapping for the pte/ptes pointing at this page's spt. If
> +    parent_ptes bit 0 is zero, only one spte points at this pages and
> +    parent_ptes points at this single spte, otherwise, there exists multiple
> +    sptes pointing at this page and (parent_ptes & ~0x1) points at a data
> +    structure with a list of parent_ptes.

Applying with this small change:

The reverse mapping for the pte/ptes pointing at this page's spt. If
bit 0 is zero, only one spte points at this pages and parent_ptes
points at this single spte.  If bit 0 is set, there exist multiple
sptes pointing at this page and (parent_ptes & ~0x1) points at a data
structure with a list of parent_ptes.

Paolo

>    unsync:
>      If true, then the translations in this page may not match the guest's
>      translation.  This is equivalent to the state of the tlb when a pte is
> 

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