linux-kernel - Re: [PATCH v5 4/8] KVM: x86: use the fast way to invalidate all pages

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Date:	Thu, 16 May 2013 19:19:03 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc:	avi.kivity@...il.com, mtosatti@...hat.com, pbonzini@...hat.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v5 4/8] KVM: x86: use the fast way to invalidate all pages

On Thu, May 16, 2013 at 08:17:49PM +0800, Xiao Guangrong wrote:
> Replace kvm_mmu_zap_all by kvm_mmu_invalidate_memslot_pages except on
> the path of mmu_notifier->release() which will be fixed in
> the later patch
> 
Why ->release() cannot use kvm_mmu_invalidate_memslot_pages()?

> Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
> ---
>  arch/x86/kvm/x86.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index d885418..c2dd732 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -5528,7 +5528,7 @@ static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt)
>  	 * to ensure that the updated hypercall appears atomically across all
>  	 * VCPUs.
>  	 */
> -	kvm_mmu_zap_all(vcpu->kvm);
> +	kvm_mmu_invalidate_memslot_pages(vcpu->kvm, NULL);
>  
>  	kvm_x86_ops->patch_hypercall(vcpu, instruction);
>  
> @@ -7079,7 +7079,7 @@ void kvm_arch_flush_shadow_all(struct kvm *kvm)
>  void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
>  				   struct kvm_memory_slot *slot)
>  {
> -	kvm_arch_flush_shadow_all(kvm);
> +	kvm_mmu_invalidate_memslot_pages(kvm, slot);
>  }
>  
>  int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
> -- 
> 1.7.7.6

--
			Gleb.
--
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