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Fri, 20 Sep 2019 19:51:53 +0000 Received: from b03ledav004.gho.boulder.ibm.com (b03ledav004.gho.boulder.ibm.com [9.17.130.235]) by b03cxnp07029.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x8KJpqgA56885528 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 20 Sep 2019 19:51:52 GMT Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5D8A878064; Fri, 20 Sep 2019 19:51:52 +0000 (GMT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C0C7F7805E; Fri, 20 Sep 2019 19:51:47 +0000 (GMT) Received: from LeoBras.aus.stglabs.ibm.com (unknown [9.18.235.184]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Fri, 20 Sep 2019 19:51:47 +0000 (GMT) From: Leonardo Bras To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 07/11] powerpc/kvm/e500: Applies counting method to monitor lockless pgtbl walks Date: Fri, 20 Sep 2019 16:50:43 -0300 Message-Id: <20190920195047.7703-8-leonardo@linux.ibm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190920195047.7703-1-leonardo@linux.ibm.com> References: <20190920195047.7703-1-leonardo@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-09-20_07:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1909200161 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: Keith Busch , Richard Fontana , Paul Mackerras , Ira Weiny , Dan Williams , "Aneesh Kumar K.V" , YueHaibing , Mike Rapoport , Jason Gunthorpe , Ganesh Goudar , Mahesh Salgaonkar , Leonardo Bras , Arnd Bergmann , John Hubbard , Nicholas Piggin , Thomas Gleixner , Allison Randal , Greg Kroah-Hartman , Andrew Morton Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Applies the counting-based method for monitoring lockless pgtable walks on kvmppc_e500_shadow_map(). Signed-off-by: Leonardo Bras --- arch/powerpc/kvm/e500_mmu_host.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_host.c index 321db0fdb9db..a1b8bfe20bc8 100644 --- a/arch/powerpc/kvm/e500_mmu_host.c +++ b/arch/powerpc/kvm/e500_mmu_host.c @@ -473,6 +473,7 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, * We are holding kvm->mmu_lock so a notifier invalidate * can't run hence pfn won't change. */ + start_lockless_pgtbl_walk(kvm->mm); local_irq_save(flags); ptep = find_linux_pte(pgdir, hva, NULL, NULL); if (ptep) { @@ -484,12 +485,15 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, local_irq_restore(flags); } else { local_irq_restore(flags); + end_lockless_pgtbl_walk(kvm->mm); pr_err_ratelimited("%s: pte not present: gfn %lx,pfn %lx\n", __func__, (long)gfn, pfn); ret = -EINVAL; goto out; } } + end_lockless_pgtbl_walk(kvm->mm); + kvmppc_e500_ref_setup(ref, gtlbe, pfn, wimg); kvmppc_e500_setup_stlbe(&vcpu_e500->vcpu, gtlbe, tsize, -- 2.20.1