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Tue, 24 Sep 2019 21:25:21 +0000 Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp08026.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x8OLPJse36110624 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 24 Sep 2019 21:25:19 GMT Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 845F0C605D; Tue, 24 Sep 2019 21:25:19 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E060BC605A; Tue, 24 Sep 2019 21:25:14 +0000 (GMT) Received: from LeoBras.aus.stglabs.ibm.com (unknown [9.18.235.184]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Tue, 24 Sep 2019 21:25:14 +0000 (GMT) From: Leonardo Bras To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org Cc: Leonardo Bras , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Arnd Bergmann , "Aneesh Kumar K.V" , Christophe Leroy , Andrew Morton , Dan Williams , Nicholas Piggin , Mahesh Salgaonkar , Greg Kroah-Hartman , Thomas Gleixner , Ganesh Goudar , Allison Randal , Mike Rapoport , YueHaibing , Ira Weiny , Jason Gunthorpe , John Hubbard , Keith Busch Subject: [PATCH v3 07/11] powerpc/kvm/e500: Applies counting method to monitor lockless pgtbl walks Date: Tue, 24 Sep 2019 18:24:24 -0300 Message-Id: <20190924212427.7734-8-leonardo@linux.ibm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190924212427.7734-1-leonardo@linux.ibm.com> References: <20190924212427.7734-1-leonardo@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-09-24_10:,, 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-1909240173 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Applies the counting-based method for monitoring lockless pgtable walks o= n 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 kvmpp= c_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 =3D find_linux_pte(pgdir, hva, NULL, NULL); if (ptep) { @@ -484,12 +485,15 @@ static inline int kvmppc_e500_shadow_map(struct kvm= ppc_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 =3D -EINVAL; goto out; } } + end_lockless_pgtbl_walk(kvm->mm); + kvmppc_e500_ref_setup(ref, gtlbe, pfn, wimg); =20 kvmppc_e500_setup_stlbe(&vcpu_e500->vcpu, gtlbe, tsize, --=20 2.20.1