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Mon, 30 May 2022 09:27:07 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Mon, 30 May 2022 09:27:07 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 25651) id 49AEEE13C2; Mon, 30 May 2022 11:27:07 +0200 (CEST) From: Christian Borntraeger To: KVM Cc: Christian Borntraeger , Janosch Frank , David Hildenbrand , linux-s390 , Thomas Huth , Claudio Imbrenda , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Janis Schoetterl-Glausch Subject: [PATCH 2/2] s390/pgtable: use non-quiescing sske for KVM switch to keyed Date: Mon, 30 May 2022 11:27:06 +0200 Message-Id: <20220530092706.11637-3-borntraeger@linux.ibm.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220530092706.11637-1-borntraeger@linux.ibm.com> References: <20220530092706.11637-1-borntraeger@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: AcQQxq36jkLSXOUHWaybs730NFH0-3lI X-Proofpoint-GUID: EMMAFhlxr9VDzXJFknTQa8hkskYm3FKz X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-30_03,2022-05-27_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 bulkscore=0 phishscore=0 suspectscore=0 mlxlogscore=999 malwarescore=0 priorityscore=1501 adultscore=0 clxscore=1015 mlxscore=0 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2204290000 definitions=main-2205300047 Precedence: bulk List-ID: X-Mailing-List: linux-s390@vger.kernel.org The switch to a keyed guest does not require a classic sske as the other guest CPUs are not accessing the key before the switch is complete. By using the NQ SSKE things are faster especially with multiple guests. Signed-off-by: Christian Borntraeger Suggested-by: Janis Schoetterl-Glausch --- arch/s390/mm/pgtable.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 697df02362af..4909dcd762e8 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -748,7 +748,7 @@ void ptep_zap_key(struct mm_struct *mm, unsigned long addr, pte_t *ptep) pgste_val(pgste) |= PGSTE_GR_BIT | PGSTE_GC_BIT; ptev = pte_val(*ptep); if (!(ptev & _PAGE_INVALID) && (ptev & _PAGE_WRITE)) - page_set_storage_key(ptev & PAGE_MASK, PAGE_DEFAULT_KEY, 1); + page_set_storage_key(ptev & PAGE_MASK, PAGE_DEFAULT_KEY, 0); pgste_set_unlock(ptep, pgste); preempt_enable(); } -- 2.35.1