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(haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 5FFDD605AB; Mon, 8 May 2023 12:01:35 +1000 (AEST) From: Rohan McLure To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH 09/12] powerpc: Mark writes registering ipi to host cpu through kvm Date: Mon, 8 May 2023 12:01:17 +1000 Message-Id: <20230508020120.218494-10-rmclure@linux.ibm.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230508020120.218494-1-rmclure@linux.ibm.com> References: <20230508020120.218494-1-rmclure@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: Or5tA-ctvLLhGAk9Pk5TENl6cHkbtqja X-Proofpoint-ORIG-GUID: Cao2PyW_VoKIoOSwGMxauOJAgG3DG6ZE X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-05-07_10,2023-05-05_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 lowpriorityscore=0 impostorscore=0 phishscore=0 mlxlogscore=711 bulkscore=0 suspectscore=0 clxscore=1015 malwarescore=0 spamscore=0 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303200000 definitions=main-2305080009 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: , Cc: Rohan McLure , npiggin@gmail.com, arnd@arndb.de Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Mark writes to hypervisor ipi state so that KCSAN recognises these asynchronous issue of kvmppc_{set,clear}_host_ipi to be intended, with atomic writes. Signed-off-by: Rohan McLure --- arch/powerpc/include/asm/kvm_ppc.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index bc57d058ad5b..d701df006c08 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -548,12 +548,12 @@ static inline void kvmppc_set_host_ipi(int cpu) * pairs with the barrier in kvmppc_clear_host_ipi() */ smp_mb(); - paca_ptrs[cpu]->kvm_hstate.host_ipi = 1; + WRITE_ONCE(paca_ptrs[cpu]->kvm_hstate.host_ipi, 1); } static inline void kvmppc_clear_host_ipi(int cpu) { - paca_ptrs[cpu]->kvm_hstate.host_ipi = 0; + WRITE_ONCE(paca_ptrs[cpu]->kvm_hstate.host_ipi, 0); /* * order clearing of host_ipi flag vs. processing of IPI messages *