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Wed, 28 Jul 2021 14:26:43 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9978BA404D; Wed, 28 Jul 2021 14:26:42 +0000 (GMT) Received: from localhost.localdomain (unknown [9.145.9.194]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 28 Jul 2021 14:26:42 +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 Subject: [PATCH v2 13/13] KVM: s390: pv: add support for UV feature bits Date: Wed, 28 Jul 2021 16:26:31 +0200 Message-Id: <20210728142631.41860-14-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210728142631.41860-1-imbrenda@linux.ibm.com> References: <20210728142631.41860-1-imbrenda@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: oUFudTQnZfpem5G6vQuiy6nKeDOhS0xb X-Proofpoint-ORIG-GUID: ipl4nIVJcp0apeOATzuSjzh5cIJhxzdX X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-07-28_08:2021-07-27,2021-07-28 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 bulkscore=0 clxscore=1015 mlxscore=0 malwarescore=0 mlxlogscore=999 spamscore=0 priorityscore=1501 adultscore=0 phishscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2107140000 definitions=main-2107280079 Precedence: bulk List-ID: X-Mailing-List: linux-s390@vger.kernel.org Add support for Ultravisor feature bits, and take advantage of the functionality advertised to speed up the lazy destroy mechanism. 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 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; } -- 2.31.1