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Tue, 20 Oct 2020 09:48:11 +0000 Received: from Alexanders-MacBook-Air.local (10.43.162.231) by EX13D20UWC001.ant.amazon.com (10.43.162.244) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 20 Oct 2020 09:48:10 +0000 Subject: Re: [PATCH] KVM: VMX: Forbid userspace MSR filters for x2APIC To: Paolo Bonzini CC: "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , Aaron Lewis , Peter Xu , Sean Christopherson References: <20201019170519.1855564-1-pbonzini@redhat.com> <618E2129-7AB5-4F0D-A6C9-E782937FE935@amazon.de> From: Alexander Graf Message-ID: Date: Tue, 20 Oct 2020 11:48:07 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:78.0) Gecko/20100101 Thunderbird/78.3.3 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Originating-IP: [10.43.162.231] X-ClientProxiedBy: EX13D44UWB001.ant.amazon.com (10.43.161.32) 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 CgpPbiAyMC4xMC4yMCAxMToyNywgUGFvbG8gQm9uemluaSB3cm90ZToKPiAKPiBPbiAxOS8xMC8y MCAxOTo0NSwgR3JhZiAoQVdTKSwgQWxleGFuZGVyIHdyb3RlOgo+Pj4gKyAgICAgICAgKiBJbiBw cmluY2lwbGUgaXQgd291bGQgYmUgcG9zc2libGUgdG8gdHJhcCB4MmFwaWMgcmFuZ2VzCj4+PiAr ICAgICAgICAqIGlmICFsYXBpY19pbl9rZXJuZWwuICBUaGlzIGhvd2V2ZXIgd291bGQgYmUgY29t cGxpY2F0ZWQKPj4+ICsgICAgICAgICogYmVjYXVzZSBLVk1fWDg2X1NFVF9NU1JfRklMVEVSIGNh biBiZSBjYWxsZWQgYmVmb3JlCj4+PiArICAgICAgICAqIEtWTV9DUkVBVEVfSVJRQ0hJUCBvciBL Vk1fRU5BQkxFX0NBUC4KPj4+ICsgICAgICAgICovCj4+PiArICAgICAgIGZvciAoaSA9IDA7IGkg PCBBUlJBWV9TSVpFKGZpbHRlci5yYW5nZXMpOyBpKyspCj4+PiArICAgICAgICAgICAgICAgaWYg KHJhbmdlX292ZXJsYXBzX3gyYXBpYygmZmlsdGVyLnJhbmdlc1tpXSkpCj4+PiArICAgICAgICAg ICAgICAgICAgICAgICByZXR1cm4gLUVJTlZBTDsKPj4KPj4gV2hhdCBpZiB0aGUgZGVmYXVsdCBh Y3Rpb24gb2YgdGhlIGZpbHRlciBpcyB0byAiZGVueSI/IFRoZW4gb25seSBhbgo+PiBNU1IgZmls dGVyIHRvIGFsbG93IGFjY2VzcyB0byB4MmFwaWMgTVNScyB3b3VsZCBtYWtlIHRoZSBmdWxsCj4+ IGZpbHRlcmluZyBsb2dpYyBhZGhlcmUgdG8gdGhlIGNvbnN0cmFpbnRzLCBubz8KPiAKPiBSaWdo dDsgb3IgbW9yZSBwcmVjaXNlbHksIHRoYXQgaXMgaGFuZGxlZCBieSBTZWFuJ3MgcGF0Y2ggdGhh dCBoZSBoYWQKPiBwb3N0ZWQgZWFybGllci4gIFRoaXMgcGF0Y2ggb25seSBtYWtlcyBpdCBpbXBv c3NpYmxlIHRvIHNldCB1cCBzdWNoIGEKPiBmaWx0ZXIuCgpXaGF0IEknbSBzYXlpbmcgaXMgdGhh dCBhICJmaWx0ZXIgcnVsZSIgY2FuIGVpdGhlciBtZWFuICJhbGxvdyIgb3IgCiJkZW55Ii4gSGVy ZSB5b3UncmUgb25seSBjaGVja2luZyBpZiB0aGVyZSBpcyBhIHJ1bGUuIFdoYXQgeW91IHdhbnQg dG8gCmZpbHRlciBmb3IgaXMgd2hldGhlciB0aGVyZSBpcyBhIGRlbnlpbmcgcnVsZSAoaW5jbHVk aW5nIGRlZmF1bHQgCmZhbGxiYWNrKSBmb3IgeDJhcGljIGFmdGVyIGFsbCBydWxlcyBhcmUgaW4g cGxhY2UuCgpJbWFnaW5lIHlvdSBhZGQgdGhlIGZvbGxvd2luZyBmaWx0ZXI6Cgp7CiAgICAgY291 bnQ6IDEsCiAgICAgZGVmYXVsdF9hbGxvdzogZmFsc2UsCiAgICAgcmFuZ2VzOiBbCiAgICAgICAg IHsKICAgICAgICAgICAgIGZsYWdzOiBLVk1fTVNSX0ZJTFRFUl9SRUFELAogICAgICAgICAgICAg bm1zcnM6IDEsCiAgICAgICAgICAgICBiYXNlOiBNU1JfRUZFUiwKICAgICAgICAgICAgIGJpdG1h cDogeyAxIH0sCiAgICAgICAgIH0sCiAgICAgXSwKfQoKVGhhdCBmaWx0ZXIgd291bGQgc2V0IGFs bCB4MmFwaWMgcmVnaXN0ZXJzIHRvICJkZW55IiwgYnV0IHdvdWxkIG5vdCBiZSAKY2F1Z2h0IGJ5 IHRoZSBjb2RlIGFib3ZlLiBDb252ZXJzZWx5LCBhIHJhbmdlIHRoYXQgZXhwbGljaXRseSBhbGxv d3MgCngyYXBpYyByYW5nZXMgd2l0aCBkZWZhdWx0X2FsbG93PTAgd291bGQgYmUgcmVqZWN0ZWQg YnkgdGhpcyBwYXRjaC4KCgpBbGV4CgoKCkFtYXpvbiBEZXZlbG9wbWVudCBDZW50ZXIgR2VybWFu eSBHbWJICktyYXVzZW5zdHIuIDM4CjEwMTE3IEJlcmxpbgpHZXNjaGFlZnRzZnVlaHJ1bmc6IENo cmlzdGlhbiBTY2hsYWVnZXIsIEpvbmF0aGFuIFdlaXNzCkVpbmdldHJhZ2VuIGFtIEFtdHNnZXJp Y2h0IENoYXJsb3R0ZW5idXJnIHVudGVyIEhSQiAxNDkxNzMgQgpTaXR6OiBCZXJsaW4KVXN0LUlE OiBERSAyODkgMjM3IDg3OQoKCg==