linux-kernel - Re: [PATCH v2 04/22] KVM: x86: introduce vcpu_gva_to

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Date:	Wed, 29 Jun 2011 11:24:09 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 04/22] KVM: x86: introduce vcpu_gva_to_gpa to cleanup
 the code

On 06/22/2011 05:29 PM, Xiao Guangrong wrote:
> Introduce vcpu_gva_to_gpa to translate the gva to gpa, we can use it
> to cleanup the code between read emulation and write emulation
>
> Signed-off-by: Xiao Guangrong<xiaoguangrong@...fujitsu.com>
> ---
>   arch/x86/kvm/x86.c |   38 +++++++++++++++++++++++++++++---------
>   1 files changed, 29 insertions(+), 9 deletions(-)
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index eb27be4..c29ef96 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -3944,6 +3944,27 @@ out:
>   }
>   EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system);
>
> +static int vcpu_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
> +			   gpa_t *gpa, struct x86_exception *exception,
> +			   bool write)
> +{
> +	u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
> +
> +	if (write)
> +		access |= PFERR_WRITE_MASK;

Needs fetch as well so NX/SMEP can work.

> +
> +	*gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);

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

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