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Wed, 18 Aug 2021 13:26:30 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 000E24C044; Wed, 18 Aug 2021 13:26:29 +0000 (GMT) Received: from p-imbrenda.bredband2.com (unknown [9.145.14.177]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 18 Aug 2021 13:26:29 +0000 (GMT) From: Claudio Imbrenda To: kvm@vger.kernel.org Cc: cohuck@redhat.com, borntraeger@de.ibm.com, frankja@linux.ibm.com, thuth@redhat.com, pasic@linux.ibm.com, david@redhat.com, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Ulrich.Weigand@de.ibm.com Subject: [PATCH v4 14/14] KVM: s390: pv: avoid export before import if possible Date: Wed, 18 Aug 2021 15:26:20 +0200 Message-Id: <20210818132620.46770-15-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210818132620.46770-1-imbrenda@linux.ibm.com> References: <20210818132620.46770-1-imbrenda@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: W2SkcQcFKC4t1y566J7A4GQq--Rck-3f X-Proofpoint-GUID: eLV76xqKNX7302yxZrBcRdjH9W3IIKrw X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-08-18_04:2021-08-17,2021-08-18 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 lowpriorityscore=0 bulkscore=0 mlxlogscore=999 priorityscore=1501 malwarescore=0 mlxscore=0 impostorscore=0 clxscore=1015 suspectscore=0 adultscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2107140000 definitions=main-2108180082 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org If the appropriate UV feature bit is set, there is no need to perform an export before import. Signed-off-by: Claudio Imbrenda --- 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 bc79085d7152..6f8aef5609c0 100644 --- a/arch/s390/kernel/uv.c +++ b/arch/s390/kernel/uv.c @@ -251,7 +251,8 @@ 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; } -- 2.31.1