linux-kernel - Re: [PATCH 04/13] KVM: MMU: introduce FNAME(get_sp

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Message-ID: <4F745E7D.5080102@redhat.com>
Date:	Thu, 29 Mar 2012 15:07:09 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 04/13] KVM: MMU: introduce FNAME(get_sp_gpa)

On 03/29/2012 11:22 AM, Xiao Guangrong wrote:
> It can calculate the base gpa of the specified shadow page on any level,
> let it instead of FNAME(get_level1_sp_gpa)
>
>
> +static gpa_t FNAME(get_sp_gpa)(struct kvm_mmu_page *sp)
> +{

Maybe worth adding a pte index and calling it get_spte_gpa(), depends on
the next patches I guess.

> +	int offset, shift;
> +
> +	shift = PAGE_SHIFT - (PT_LEVEL_BITS - PT64_LEVEL_BITS) * sp->role.level;
> +	offset = sp->role.quadrant << shift;

if you add '& ~PAGE_MASK' the compiler may be smart enough to drop the
whole thing for 64-bit ptes.

> +
> +	return gfn_to_gpa(sp->gfn) + offset;
> +}
> +
>  /*
>   * Page fault handler.  There are several causes for a page fault:
>   *   - there is no shadow pte for the guest pte
> @@ -659,18 +669,6 @@ out_unlock:
>  	return 0;
>

-- 
error compiling committee.c: too many arguments to function

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