Re: [kvm-devel] [PATCH] KVM: add KVM_SYNC_SHADOW_WITH_USER ioctl

[Dor L. <dor...@gm...>]

Marcelo Tosatti wrote:
> The host needs to zap its shadow entries before performing an inflate
> operation to avoid the guest from using stale ones.
>
> So add an ioctl to interface with kvm_mmu_zap_all().
>
> Signed-off-by: Marcelo Tosatti <mto...@re...>
>
> Index: kvm.quilt/virt/kvm/kvm_main.c
> ===================================================================
> --- kvm.quilt.orig/virt/kvm/kvm_main.c
> +++ kvm.quilt/virt/kvm/kvm_main.c
> @@ -971,6 +971,11 @@ static long kvm_vm_ioctl(struct file *fi
>  			goto out;
>  		break;
>  	}
> +	case KVM_SYNC_SHADOW_WITH_USER: {
> +		r = 0;
> +		kvm_mmu_zap_all(kvm);
> +		break;
> +	}
>   
It should go into the arch ioctl below since the mmu is under x86
>  	default:
>  		r = kvm_arch_vm_ioctl(filp, ioctl, arg);
>  	}
>
>
>