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Wed, 17 Mar 2021 19:29:49 +0000 Received: from Alexanders-MacBook-Air.local (10.43.160.67) by EX13D20UWC001.ant.amazon.com (10.43.162.244) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 17 Mar 2021 19:29:47 +0000 Subject: Re: [PATCH 1/4] KVM: x86: Protect userspace MSR filter with SRCU, and set atomically-ish To: Sean Christopherson , Paolo Bonzini CC: Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , , , Yuan Yao References: <20210316184436.2544875-1-seanjc@google.com> <20210316184436.2544875-2-seanjc@google.com> From: Alexander Graf Message-ID: <08ac1383-27d0-e5f9-a618-b9e43dc5dc12@amazon.com> Date: Wed, 17 Mar 2021 20:29:44 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20210316184436.2544875-2-seanjc@google.com> Content-Language: en-US X-Originating-IP: [10.43.160.67] X-ClientProxiedBy: EX13D31UWA004.ant.amazon.com (10.43.160.217) To EX13D20UWC001.ant.amazon.com (10.43.162.244) Content-Type: text/plain; charset="utf-8"; format="flowed" Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org CgpPbiAxNi4wMy4yMSAxOTo0NCwgU2VhbiBDaHJpc3RvcGhlcnNvbiB3cm90ZToKPiAKPiBGaXgg YSBwbGV0aG9yYSBvZiBpc3N1ZXMgd2l0aCBNU1IgZmlsdGVyaW5nIGJ5IGluc3RhbGxpbmcgdGhl IHJlc3VsdGluZwo+IGZpbHRlciBhcyBhbiBhdG9taWMgYnVuZGxlIGluc3RlYWQgb2YgdXBkYXRp bmcgdGhlIGxpdmUgZmlsdGVyIG9uZSByYW5nZQo+IGF0IGEgdGltZS4gIFRoZSBLVk1fWDg2X1NF VF9NU1JfRklMVEVSIGlvY3RsKCkgaXNuJ3QgdHJ1bHkgYXRvbWljLCBhcwo+IHRoZSBoYXJkd2Fy ZSBNU1IgYml0bWFwcyB3b24ndCBiZSB1cGRhdGVkIHVudGlsIHRoZSBuZXh0IFZNLUVudGVyLCBi dXQKPiB0aGUgcmVsZXZhbnQgc29mdHdhcmUgc3RydWN0IGlzIGF0b21pY2FsbHkgdXBkYXRlZCwg d2hpY2ggaXMgd2hhdCBLVk0KPiByZWFsbHkgbmVlZHMuCj4gCj4gU2ltaWxhciB0byB0aGUgYXBw cm9hY2ggdXNlZCBmb3IgbW9kaWZ5aW5nIG1lbXNsb3RzLCBtYWtlIGFyY2gubXNyX2ZpbHRlcgo+ IGEgU1JDVS1wcm90ZWN0ZWQgcG9pbnRlciwgZG8gYWxsIHRoZSB3b3JrIGNvbmZpZ3VyaW5nIHRo ZSBuZXcgZmlsdGVyCj4gb3V0c2lkZSBvZiBrdm0tPmxvY2ssIGFuZCB0aGVuIGFjcXVpcmUga3Zt LT5sb2NrIG9ubHkgd2hlbiB0aGUgbmV3IGZpbHRlcgo+IGhhcyBiZWVuIHZldHRlZCBhbmQgY3Jl YXRlZC4gIFRoYXQgd2F5IHZDUFUgcmVhZGVycyBlaXRoZXIgc2VlIHRoZSBvbGQKPiBmaWx0ZXIg b3IgdGhlIG5ldyBmaWx0ZXIgaW4gdGhlaXIgZW50aXJldHksIG5vdCBzb21lIGhhbGYtYmFrZWQg c3RhdGUuCj4gCj4gWXVhbiBZYW8gcG9pbnRlZCBvdXQgYSB1c2UtYWZ0ZXItZnJlZSBpbiBrc21f bXNyX2FsbG93ZWQoKSBkdWUgdG8gYQo+IFRPQ1RPVSBidWcsIGJ1dCB0aGF0J3MganVzdCB0aGUg dGlwIG9mIHRoZSBpY2ViZXJnLi4uCj4gCj4gICAgLSBOb3RoaW5nIGlzIF9fcmN1IGFubm90YXRl ZCwgbWFraW5nIGl0IG5pZ2ggaW1wb3NzaWJsZSB0byBhdWRpdCB0aGUKPiAgICAgIGNvZGUgZm9y IGNvcnJlY3RuZXNzLgo+ICAgIC0ga3ZtX2FkZF9tc3JfZmlsdGVyKCkgaGFzIGFuIHVucGFpcmVk IHNtcF93bWIoKS4gIFZpb2xhdGlvbiBvZiBrZXJuZWwKPiAgICAgIGNvZGluZyBzdHlsZSBhc2lk ZSwgdGhlIGxhY2sgb2YgYSBzbWJfcm1iKCkgYW55d2hlcmUgY2FzdHMgYWxsIGNvZGUKPiAgICAg IGludG8gZG91YnQuCj4gICAgLSBrdm1fY2xlYXJfbXNyX2ZpbHRlcigpIGhhcyBhIGRvdWJsZSBm cmVlIFRPQ1RPVSBidWcsIGFzIGl0IGdyYWJzCj4gICAgICBjb3VudCBiZWZvcmUgdGFraW5nIHRo ZSBsb2NrLgo+ICAgIC0ga3ZtX2NsZWFyX21zcl9maWx0ZXIoKSBhbHNvIGhhcyBtZW1vcnkgbGVh ayBkdWUgdG8gdGhlIHNhbWUgVE9DVE9VIGJ1Zy4KPiAKPiBUaGUgZW50aXJlIGFwcHJvYWNoIG9m IHVwZGF0aW5nIHRoZSBsaXZlIGZpbHRlciBpcyBhbHNvIGZsYXdlZC4gIFdoaWxlCj4gaW5zdGFs bGluZyBhIG5ldyBmaWx0ZXIgaXMgaW5oZXJlbnRseSByYWN5IGlmIHZDUFVzIGFyZSBydW5uaW5n LCBmaXhpbmcKPiB0aGUgYWJvdmUgaXNzdWVzIGFsc28gbWFrZXMgaXQgdHJpdmlhbCB0byBlbnN1 cmUgY2VydGFpbiBiZWhhdmlvciBpcwo+IGRldGVybWluaXN0aWMsIGUuZy4gS1ZNIGNhbiBwcm92 aWRlIGRldGVybWluaXN0aWMgYmVoYXZpb3IgZm9yIE1TUnMgd2l0aAo+IGlkZW50aWNhbCBzZXR0 aW5ncyBpbiB0aGUgb2xkIGFuZCBuZXcgZmlsdGVycy4gIEFuIGF0b21pYyB1cGRhdGUgb2YgdGhl Cj4gZmlsdGVyIGFsc28gcHJldmVudHMgS1ZNIGZyb20gZ2V0dGluZyBpbnRvIGEgaGFsZi1iYWtl ZCBzdGF0ZSwgZS5nLiBpZgo+IGluc3RhbGxpbmcgYSBmaWx0ZXIgZmFpbHMsIHRoZSBleGlzdGlu ZyBhcHByb2FjaCB3b3VsZCBsZWF2ZSB0aGUgZmlsdGVyCj4gaW4gYSBoYWxmLWJha2VkIHN0YXRl LCBoYXZpbmcgYWxyZWFkeSBjb21taXR0ZWQgd2hhdGV2ZXIgYml0cyBvZiB0aGUKPiBmaWx0ZXIg d2VyZSBhbHJlYWR5IHByb2Nlc3NlZC4KPiAKPiBbKl0gaHR0cHM6Ly9sa21sLmtlcm5lbC5vcmcv ci8yMDIxMDMxMjA4MzE1Ny4yNTQwMy0xLXlhb3l1YW4wMzI5b3NAZ21haWwuY29tCj4gCj4gRml4 ZXM6IDFhMTU1MjU0ZmY5MyAoIktWTTogeDg2OiBJbnRyb2R1Y2UgTVNSIGZpbHRlcmluZyIpCj4g Q2M6IHN0YWJsZUB2Z2VyLmtlcm5lbC5vcmcKPiBDYzogQWxleGFuZGVyIEdyYWYgPGdyYWZAYW1h em9uLmNvbT4KPiBSZXBvcnRlZC1ieTogWXVhbiBZYW8gPHlhb3l1YW4wMzI5b3NAZ21haWwuY29t Pgo+IFNpZ25lZC1vZmYtYnk6IFNlYW4gQ2hyaXN0b3BoZXJzb24gPHNlYW5qY0Bnb29nbGUuY29t PgoKVGhhbmtzIGEgbG90IFNlYW4gZm9yIGNsZWFuaW5nIHVwIGFmdGVyIG1lISBJIHdhcyB0cnlp bmcgdG8gYmUgYSBiaXQgdG9vIApzbWFydCB3aXRoIHRoZSBpbmJhbmQgY291bnQgYXMgdG9rZW4g dW5mb3J0dW5hdGVseSA6KQoKUmV2aWV3ZWQtYnk6IEFsZXhhbmRlciBHcmFmIDxncmFmQGFtYXpv bi5jb20+CgoKQWxleAoKCgpBbWF6b24gRGV2ZWxvcG1lbnQgQ2VudGVyIEdlcm1hbnkgR21iSApL cmF1c2Vuc3RyLiAzOAoxMDExNyBCZXJsaW4KR2VzY2hhZWZ0c2Z1ZWhydW5nOiBDaHJpc3RpYW4g U2NobGFlZ2VyLCBKb25hdGhhbiBXZWlzcwpFaW5nZXRyYWdlbiBhbSBBbXRzZ2VyaWNodCBDaGFy bG90dGVuYnVyZyB1bnRlciBIUkIgMTQ5MTczIEIKU2l0ejogQmVybGluClVzdC1JRDogREUgMjg5 IDIzNyA4NzkKCgo=