linux-kernel - Re: [PATCH 15/18] KVM: MMU: Propagate the right fault back to the guest after gva_to

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Date:	Mon, 15 Mar 2010 09:36:52 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 15/18] KVM: MMU: Propagate the right fault back to the
 guest after gva_to_gpa

On 03/03/2010 09:12 PM, Joerg Roedel wrote:
> This patch implements logic to make sure that either a
> page-fault/page-fault-vmexit or a nested-page-fault-vmexit
> is propagated back to the guest.
>
> Signed-off-by: Joerg Roedel<joerg.roedel@....com>
> ---
>   arch/x86/kvm/mmu.h         |    1 +
>   arch/x86/kvm/paging_tmpl.h |    2 ++
>   arch/x86/kvm/x86.c         |   15 ++++++++++++++-
>   3 files changed, 17 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
> index 64f619b..b42b27e 100644
> --- a/arch/x86/kvm/mmu.h
> +++ b/arch/x86/kvm/mmu.h
> @@ -47,6 +47,7 @@
>   #define PFERR_USER_MASK (1U<<  2)
>   #define PFERR_RSVD_MASK (1U<<  3)
>   #define PFERR_FETCH_MASK (1U<<  4)
> +#define PFERR_NESTED_MASK (1U<<  31)
>    


Why is this needed?  Queue an ordinary page fault page; the injection 
code should check the page fault intercept and #VMEXIT if needed.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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