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Sat, 19 Feb 2022 20:08:18 GMT Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2A0C578068; Sat, 19 Feb 2022 20:08:18 +0000 (GMT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2FC7478064; Sat, 19 Feb 2022 20:08:17 +0000 (GMT) Received: from localhost.localdomain (unknown [9.160.92.72]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Sat, 19 Feb 2022 20:08:17 +0000 (GMT) Message-ID: Subject: [PATCH v3 4/4] powerpc/pseries/vas: Disable window open during migration From: Haren Myneni To: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, npiggin@gmail.com, nathanl@linux.ibm.com Date: Sat, 19 Feb 2022 12:08:15 -0800 In-Reply-To: <4a23d5ec655fd00da97b0b0b46174a3a3894bfb0.camel@linux.ibm.com> References: <4a23d5ec655fd00da97b0b0b46174a3a3894bfb0.camel@linux.ibm.com> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.36.5 (3.36.5-2.fc32) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: nm2orN7R5bKk2T9ZyamH75o_EOBS4B27 X-Proofpoint-GUID: lQyUsae5VlSCQfO1fMBzUa0joFr9QcJK X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-02-19_04,2022-02-18_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 mlxscore=0 phishscore=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 adultscore=0 clxscore=1015 malwarescore=0 mlxlogscore=924 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202190130 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" The current partition migration implementation does not freeze the user space and the user space can continue open VAS windows. So when migration_in_progress flag is enabled, VAS open window API returns -EBUSY. Signed-off-by: Haren Myneni --- arch/powerpc/platforms/pseries/vas.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/platforms/pseries/vas.c b/arch/powerpc/platforms/pseries/vas.c index df22827969db..4be80112b05e 100644 --- a/arch/powerpc/platforms/pseries/vas.c +++ b/arch/powerpc/platforms/pseries/vas.c @@ -30,6 +30,7 @@ static struct hv_vas_cop_feat_caps hv_cop_caps; static struct vas_caps vascaps[VAS_MAX_FEAT_TYPE]; static DEFINE_MUTEX(vas_pseries_mutex); +static bool migration_in_progress; static long hcall_return_busy_check(long rc) { @@ -356,8 +357,11 @@ static struct vas_window *vas_allocate_window(int vas_id, u64 flags, * same fault IRQ is not freed by the OS before. */ mutex_lock(&vas_pseries_mutex); - rc = allocate_setup_window(txwin, (u64 *)&domain[0], - cop_feat_caps->win_type); + if (migration_in_progress) + rc = -EBUSY; + else + rc = allocate_setup_window(txwin, (u64 *)&domain[0], + cop_feat_caps->win_type); mutex_unlock(&vas_pseries_mutex); if (rc) goto out; @@ -890,6 +894,11 @@ int vas_migration_handler(int action) mutex_lock(&vas_pseries_mutex); + if (action == VAS_SUSPEND) + migration_in_progress = true; + else + migration_in_progress = false; + for (i = 0; i < VAS_MAX_FEAT_TYPE; i++) { vcaps = &vascaps[i]; caps = &vcaps->caps; -- 2.27.0