Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [PATCH v2 13/13] KVM: s390: pv: add support for UV feature bits
To:     Claudio Imbrenda <imbrenda@linux.ibm.com>, kvm@vger.kernel.org
Cc:     cohuck@redhat.com, borntraeger@de.ibm.com, thuth@redhat.com,
        pasic@linux.ibm.com, david@redhat.com, linux-s390@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20210728142631.41860-1-imbrenda@linux.ibm.com>
 <20210728142631.41860-14-imbrenda@linux.ibm.com>
From:   Janosch Frank <frankja@linux.ibm.com>
Message-ID: <4d26ba27-e235-8f2b-c59c-01d3e0691453@linux.ibm.com>
Date:   Thu, 29 Jul 2021 11:52:58 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101
 Thunderbird/78.11.0
MIME-Version: 1.0
In-Reply-To: <20210728142631.41860-14-imbrenda@linux.ibm.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 7/28/21 4:26 PM, Claudio Imbrenda wrote:
> Add support for Ultravisor feature bits, and take advantage of the
> functionality advertised to speed up the lazy destroy mechanism.

UV feature bit support is already merged please fix the description and
subject.

> 
> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
> ---
>  arch/s390/kernel/uv.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
> index f0af49b09a91..6ec3d7338ec8 100644
> --- a/arch/s390/kernel/uv.c
> +++ b/arch/s390/kernel/uv.c
> @@ -290,7 +290,8 @@ static int make_secure_pte(pte_t *ptep, unsigned long addr,
>  
>  static bool should_export_before_import(struct uv_cb_header *uvcb, struct mm_struct *mm)
>  {
> -	return uvcb->cmd != UVC_CMD_UNPIN_PAGE_SHARED &&
> +	return !test_bit_inv(BIT_UV_FEAT_MISC, &uv_info.uv_feature_indications) &&
> +		uvcb->cmd != UVC_CMD_UNPIN_PAGE_SHARED &&
>  		atomic_read(&mm->context.is_protected) > 1;
>  }
>  
>