linux-kernel - Re: [PATCH] KVM: MTRR: Use default type for non-MTRR-covered gfn before WARN

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Date:	Wed, 5 Aug 2015 11:58:32 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Alex Williamson <alex.williamson@...hat.com>, kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, guangrong.xiao@...el.com
Subject: Re: [PATCH] KVM: MTRR: Use default type for non-MTRR-covered gfn
 before WARN_ON



On 04/08/2015 18:58, Alex Williamson wrote:
> The patch was munged on commit to re-order these tests resulting in
> excessive warnings when trying to do device assignment.  Return to
> original ordering: https://lkml.org/lkml/2015/7/15/769
> 
> Fixes: 3e5d2fdceda1 ("KVM: MTRR: simplify kvm_mtrr_get_guest_memory_type")
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>

Applied, thanks.  Sorry for the delay.

Paolo

> ---
> 
> For v4.2
> 
>  arch/x86/kvm/mtrr.c |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c
> index dc0a84a..9e8bf13 100644
> --- a/arch/x86/kvm/mtrr.c
> +++ b/arch/x86/kvm/mtrr.c
> @@ -672,16 +672,16 @@ u8 kvm_mtrr_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn)
>  	if (iter.mtrr_disabled)
>  		return mtrr_disabled_type();
>  
> +	/* not contained in any MTRRs. */
> +	if (type == -1)
> +		return mtrr_default_type(mtrr_state);
> +
>  	/*
>  	 * We just check one page, partially covered by MTRRs is
>  	 * impossible.
>  	 */
>  	WARN_ON(iter.partial_map);
>  
> -	/* not contained in any MTRRs. */
> -	if (type == -1)
> -		return mtrr_default_type(mtrr_state);
> -
>  	return type;
>  }
>  EXPORT_SYMBOL_GPL(kvm_mtrr_get_guest_memory_type);
> 
--
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