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Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.14.0 Subject: Re: [PATCH] KVM: arm64: pmu: Resync EL0 state on counter rotation To: Leo Yan Cc: Marc Zyngier , kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, James Morse , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Huang Shijie , Mark Rutland , Will Deacon References: <20230811180520.131727-1-maz@kernel.org> <20230814071627.GA3963214@leoy-huanghe> <5608d22d-47c3-2a03-a3d9-ba8ec51679a3@amperemail.onmicrosoft.com> <20230814084710.GA69080@leoy-huanghe.lan> <8640c3c7-b117-5754-6ac4-910988e5374f@amperemail.onmicrosoft.com> <20230814100154.GB69080@leoy-huanghe.lan> From: Shijie Huang In-Reply-To: <20230814100154.GB69080@leoy-huanghe.lan> X-ClientProxiedBy: CH0PR03CA0400.namprd03.prod.outlook.com (2603:10b6:610:11b::20) To DM8PR01MB6824.prod.exchangelabs.com (2603:10b6:8:23::24) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM8PR01MB6824:EE_|SJ2PR01MB8660:EE_ X-MS-Office365-Filtering-Correlation-Id: 0f43ff65-4fb5-4772-896a-08db9d3b9b68 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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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 SGkgTGVvLAoK5ZyoIDIwMjMvOC8xNCAxODowMSwgTGVvIFlhbiDlhpnpgZM6Cj4gSGkgU2hpamll LAo+Cj4gT24gTW9uLCBBdWcgMTQsIDIwMjMgYXQgMDU6Mjk6NTRQTSArMDgwMCwgU2hpamllIEh1 YW5nIHdyb3RlOgo+Cj4KPiBbLi4uXQo+Cj4+PiBTZWVtcyB0byBtZSwgYmFzZWQgb24gTWFyYydz IHBhdGNoLCB3ZSBuZWVkIHRvIGFwcGx5IGJlbG93IGNoYW5nZS4gIEluCj4+PiBiZWxvdyBjb2Rl LCB3ZSBkb24ndCBuZWVkIHRvIGNoYW5nZSB0aGUgcGVyZiBjb3JlIGNvZGUgYW5kIHdlIGNhbgo+ Pj4gcmVzb2x2ZSBpdCBhcyBhIGNvbW1vbiBpc3N1ZSBmb3IgQXJtIFBNVSBkcml2ZXJzLgo+Pj4K Pj4+Cj4+PiBkaWZmIC0tZ2l0IGEvYXJjaC9hcm02NC9rdm0vcG11LmMgYi9hcmNoL2FybTY0L2t2 bS9wbXUuYwo+Pj4gaW5kZXggMTIxZjFhMTRjODI5Li44Zjk2NzNjZGFkZWMgMTAwNjQ0Cj4+PiAt LS0gYS9hcmNoL2FybTY0L2t2bS9wbXUuYwo+Pj4gKysrIGIvYXJjaC9hcm02NC9rdm0vcG11LmMK Pj4+IEBAIC0zOCwxNCArMzgsMjAgQEAgc3RydWN0IGt2bV9wbXVfZXZlbnRzICprdm1fZ2V0X3Bt dV9ldmVudHModm9pZCkKPj4+ICAgIHZvaWQga3ZtX3NldF9wbXVfZXZlbnRzKHUzMiBzZXQsIHN0 cnVjdCBwZXJmX2V2ZW50X2F0dHIgKmF0dHIpCj4+PiAgICB7Cj4+PiAgICAJc3RydWN0IGt2bV9w bXVfZXZlbnRzICpwbXUgPSBrdm1fZ2V0X3BtdV9ldmVudHMoKTsKPj4+ICsJaW50IHJlc3luYzsK Pj4+ICAgIAlpZiAoIWt2bV9hcm1fc3VwcG9ydF9wbXVfdjMoKSB8fCAhcG11IHx8ICFrdm1fcG11 X3N3aXRjaF9uZWVkZWQoYXR0cikpCj4+PiAgICAJCXJldHVybjsKPj4+ICsJcmVzeW5jID0gcG11 LT5ldmVudHNfZ3Vlc3QgIT0gc2V0Owo+PiBJZiB3ZSBzZXQgdHdvIGV2ZW50cyBpbiBndWVzdCwg dGhlIHJlc3luYyB3aWxsIHNldAo+Pgo+PiBGb3IgZXhhbXBsZToKPj4KPj4gIMKgwqDCoMKgwqDC oMKgwqDCoMKgIHBlcmYgc3RhdCAtZSBjeWNsZXM6R3UsIGN5Y2xlczpHawo+Pgo+Pgo+PiBJZiBz bywgdGhpcyBpcyBub3QgcmVhc29uYmxlLi4uCj4gWW91IG1lYW4gaWYgc2V0IHR3byBndWVzdCBl dmVudHMsIHRoZSBrdm1fdmNwdV9wbXVfcmVzeW5jX2VsMCgpIHdpbGwKPiBiZSBpbnZva2VkIHR3 aWNlLCBhbmQgdGhlIHNlY29uZCBjYWxsaW5nIGlzIG5vdCByZWFzb25hYmxlLCByaWdodD8KCklN SE8sIGV2ZW4gdGhlIGZpcnN0IHRpbWUgaXMgbm90IHJlYXNvbmFibGUuIHdoeSBjYWxsIAprdm1f dmNwdV9wbXVfcmVzeW5jX2VsMCgpIHdoZW4gZXZlbnQgcm90YXRpb24KCmRvZXMgbm90IGhhcHBl bj8KCgoKPiBJIGNhbiBhY2NlcHQgdGhpcyBzaW5jZSBJIHBlcnNvbmFsbHkgdGhpbmsgdGhpcyBz aG91bGQgbm90IGludHJvZHVjZQo+IG11Y2ggcGVyZm9ybWFuY2UgcGVuYWx0eS4KPgo+IEkgdW5k ZXJzdGFuZCB5b3VyIHByZWZlcmVuY2UgdG8gY2FsbCBrdm1fdmNwdV9wbXVfcmVzeW5jX2VsMCgp IGZyb20KPiBwZXJmIGNvcmUgbGF5ZXIsIGJ1dCB0aGlzIGlzIG5vdCBhIGNvbW1vbiBpc3N1ZSBm b3IgYWxsIFBNVSBldmVudHMgYW5kCj4gY3Jvc3NpbmcgYXJjaGVzLiAgRnVydGhlcm1vcmUsIGV2 ZW4gcGVyZiBjb3JlIHJvdGF0ZXMgZXZlbnRzLCBpdCdzIG5vdAoKSWYgd2UgY2FuIGZpbmQgYSBi ZXR0ZXIgd2F5IHRvIGZpeCBpdCBpbiBQTVUgY29kZSwgSSBhbSBva2F5IHRvby4gOikKCkkgdHJp ZWQgdG8gZml4IGl0IGluIFBNVSBjb2RlLCBidXQgSSBhbSBub3Qgc2F0aWZpZWQgd2l0aCBpdC4K Cgo+IG5lY2Vzc2FyaWx5IG1lYW4gd2UgbXVzdCByZXN0b3JlIGV2ZW50cyBmb3IgZ3Vlc3QgaW4g dGhlIGNhc2UgdGhlcmUKPiBoYXZlIG5vIGV2ZW50IGlzIGVuYWJsZWQgZm9yIGd1ZXN0LgoKTm90 IG9ubHkgZm9yIGV2ZW50cyBpbiBndWVzdCwgYnV0IGFsc28gZm9yIHRoZSBldmVudHMgaW4gdGhl IGhvc3QgdG9vLgoKSW4gdGhlIGt2bV92Y3B1X3BtdV9yZXN0b3JlX2d1ZXN0KCksIGl0IGFsc28g ZGlzYWJsZSB0aGUgRUwwIGZvciBob3N0IApldmVudHMuCgoKVGhhbmtzCgpIdWFuZyBTaGlqaWUK Cj4KPiBUaGFua3MsCj4gTGVvCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1hcm0ta2VybmVs QGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9s aXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==