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dkim=none (message not signed) header.d=none;oracle.com; dmarc=none action=none header.from=oracle.com; Received: from CH2PR10MB4391.namprd10.prod.outlook.com (2603:10b6:610:7d::11) by CH0PR10MB5498.namprd10.prod.outlook.com (2603:10b6:610:ed::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.20; Tue, 6 Jul 2021 15:35:43 +0000 Received: from CH2PR10MB4391.namprd10.prod.outlook.com ([fe80::b895:ab48:fa35:3f15]) by CH2PR10MB4391.namprd10.prod.outlook.com ([fe80::b895:ab48:fa35:3f15%4]) with mapi id 15.20.4287.033; Tue, 6 Jul 2021 15:35:43 +0000 Subject: Re: [PATCH] KVM: arm64: Disabling disabled PMU counters wastes a lot of time To: Marc Zyngier Cc: will@kernel.org, catalin.marinas@arm.com, alexandru.elisei@arm.com, james.morse@arm.com, suzuki.poulose@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, konrad.wilk@oracle.com, alexandre.chartre@oracle.com References: <20210628161925.401343-1-alexandre.chartre@oracle.com> <878s2tavks.wl-maz@kernel.org> <87y2aj7av5.wl-maz@kernel.org> From: Alexandre Chartre Message-ID: Date: Tue, 6 Jul 2021 17:35:37 +0200 User-Agent: Mozilla/5.0 (X11; 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The access >> functions (for pmcnten, pminten, pmovs), clear or set only the >> specified valid counter bits. This means that bits other than the >> valid counter bits never change in __vcpu_sys_reg(), and those bits >> are not necessarily zero because the initial value is >> 0x1de7ec7edbadc0deULL (set by reset_unknown()). > > That's a bug that should be fixed on its own. Bits that are RAZ/WI in > the architecture shouldn't be kept in the shadow registers the first > place. I'll have a look. > >> So I will resubmit initial patch, with just the commit message >> changes. > > Please don't. I'm not papering over this kind of bug. > Right, I meant I will resubmit after -rc1 as you requested. Thanks, alex. 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Tue, 6 Jul 2021 15:35:43 +0000 Subject: Re: [PATCH] KVM: arm64: Disabling disabled PMU counters wastes a lot of time To: Marc Zyngier Cc: will@kernel.org, catalin.marinas@arm.com, alexandru.elisei@arm.com, james.morse@arm.com, suzuki.poulose@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, konrad.wilk@oracle.com, alexandre.chartre@oracle.com References: <20210628161925.401343-1-alexandre.chartre@oracle.com> <878s2tavks.wl-maz@kernel.org> <87y2aj7av5.wl-maz@kernel.org> From: Alexandre Chartre Message-ID: Date: Tue, 6 Jul 2021 17:35:37 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 In-Reply-To: <87y2aj7av5.wl-maz@kernel.org> Content-Language: en-US X-ClientProxiedBy: LO2P123CA0094.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:139::9) To CH2PR10MB4391.namprd10.prod.outlook.com (2603:10b6:610:7d::11) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (2.7.202.103) by LO2P123CA0094.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:139::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4287.23 via Frontend Transport; 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charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org CgpPbiA3LzYvMjEgNDo1MiBQTSwgTWFyYyBaeW5naWVyIHdyb3RlOgo+IE9uIFR1ZSwgMDYgSnVs IDIwMjEgMTQ6NTA6MzUgKzAxMDAsCj4gQWxleGFuZHJlIENoYXJ0cmUgPGFsZXhhbmRyZS5jaGFy dHJlQG9yYWNsZS5jb20+IHdyb3RlOgo+Pgo+Pgo+PiBIaSBNYXJjLAo+Pgo+PiBPbiA2LzI5LzIx IDM6MTYgUE0sIEFsZXhhbmRyZSBDaGFydHJlIHdyb3RlOgo+Pj4gT24gNi8yOS8yMSAxMTowNiBB TSwgTWFyYyBaeW5naWVyIHdyb3RlCj4+PiBbLi4uXQo+Pj4+IFNvwqB0aGXCoHN5c3JlZ8KgaXPC oHRoZcKgb25secKgdGhpbmfCoHdlwqBzaG91bGTCoGNvbnNpZGVyLMKgYW5kwqBJwqB0aGlua8Kg d2UKPj4+PiBzaG91bGTCoGRyb3DCoHRoZcKgdXNlbGVzc8KgbWFza2luZy7CoFRoZXJlwqBpc8Kg YXTCoGxlYXN0wqBhbm90aGVywqBpbnN0YW5jZcKgb2YKPj4+PiB0aGlzwqBpbsKgdGhlwqBQTVXC oGNvZGXCoChrdm1fcG11X292ZXJmbG93X3N0YXR1cygpKSzCoGFuZMKgYXBhcnTCoGZyb20KPj4+ PiBrdm1fcG11X3ZjcHVfcmVzZXQoKSzCoG9ubHnCoHRoZcKgc3lzcmVnwqBhY2Nlc3NvcnPCoHNo b3VsZMKgY2FyZcKgYWJvdXTCoHRoZQo+Pj4+IG1hc2tpbmfCoHRvwqBzYW5pdGlzZcKgYWNjZXNz ZXMuCj4+Pj4KPj4+PiBXaGF0wqBkb8KgeW91wqB0aGluaz8KPj4+Pgo+Pj4KPj4+IEnCoHRoaW5r wqB5b3XCoGFyZcKgcmlnaHQuwqBQTUNOVEVOU0VUX0VMMMKgaXPCoGFscmVhZHnCoG1hc2tlZMKg d2l0aMKga3ZtX3BtdV92YWxpZF9jb3VudGVyX21hc2soKQo+Pj4gc2/CoHRoZXJlJ3PCoGVmZmVj dGl2ZWx5wqBub8KgbmVlZMKgdG/CoG1hc2vCoGl0wqBhZ2FpbsKgd2hlbsKgd2XCoHVzZcKgaXQu wqBJwqB3aWxswqBzZW5kwqBhbsKgYWRkaXRpb25hbAo+Pj4gcGF0Y2jCoChvbsKgdG9wwqBvZsKg dGhpc8Kgb25lKcKgdG/CoHJlbW92ZcKgdXNlbGVzc8KgbWFza2luZy7CoEJhc2ljYWxseSzCoGNo YW5nZXPCoHdvdWxkwqBiZToKPj4KPj4gSSBoYWQgYSBjbG9zZXIgbG9vayBhbmQgd2UgY2FuJ3Qg cmVtb3ZlIHRoZSBtYXNrLiBUaGUgYWNjZXNzCj4+IGZ1bmN0aW9ucyAoZm9yIHBtY250ZW4sIHBt aW50ZW4sIHBtb3ZzKSwgY2xlYXIgb3Igc2V0IG9ubHkgdGhlCj4+IHNwZWNpZmllZCB2YWxpZCBj b3VudGVyIGJpdHMuIFRoaXMgbWVhbnMgdGhhdCBiaXRzIG90aGVyIHRoYW4gdGhlCj4+IHZhbGlk IGNvdW50ZXIgYml0cyBuZXZlciBjaGFuZ2UgaW4gX192Y3B1X3N5c19yZWcoKSwgYW5kIHRob3Nl IGJpdHMKPj4gYXJlIG5vdCBuZWNlc3NhcmlseSB6ZXJvIGJlY2F1c2UgdGhlIGluaXRpYWwgdmFs dWUgaXMKPj4gMHgxZGU3ZWM3ZWRiYWRjMGRlVUxMIChzZXQgYnkgcmVzZXRfdW5rbm93bigpKS4K PiAKPiBUaGF0J3MgYSBidWcgdGhhdCBzaG91bGQgYmUgZml4ZWQgb24gaXRzIG93bi4gQml0cyB0 aGF0IGFyZSBSQVovV0kgaW4KPiB0aGUgYXJjaGl0ZWN0dXJlIHNob3VsZG4ndCBiZSBrZXB0IGlu IHRoZSBzaGFkb3cgcmVnaXN0ZXJzIHRoZSBmaXJzdAo+IHBsYWNlLiBJJ2xsIGhhdmUgYSBsb29r Lgo+IAo+PiBTbyBJIHdpbGwgcmVzdWJtaXQgaW5pdGlhbCBwYXRjaCwgd2l0aCBqdXN0IHRoZSBj b21taXQgbWVzc2FnZQo+PiBjaGFuZ2VzLgo+IAo+IFBsZWFzZSBkb24ndC4gSSdtIG5vdCBwYXBl cmluZyBvdmVyIHRoaXMga2luZCBvZiBidWcuCj4gCgpSaWdodCwgSSBtZWFudCBJIHdpbGwgcmVz dWJtaXQgYWZ0ZXIgLXJjMSBhcyB5b3UgcmVxdWVzdGVkLgoKVGhhbmtzLAoKYWxleC4KCgpfX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2Vy bmVsIG1haWxpbmcgbGlzdApsaW51eC1hcm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0 cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVs Cg==