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Mon, 16 Nov 2020 21:09:54 +0800 (CST) Received: from [10.174.185.179] (10.174.185.179) by DGGEMS413-HUB.china.huawei.com (10.3.19.213) with Microsoft SMTP Server id 14.3.487.0; Mon, 16 Nov 2020 21:09:53 +0800 Subject: Re: [PATCH 1/2] KVM: arm64: vgic: Forbid invalid userspace Redistributor accesses To: Marc Zyngier References: <20201113142801.1659-1-yuzenghui@huawei.com> <20201113142801.1659-2-yuzenghui@huawei.com> <724c43702b52aac0d3c9beb9604d1bfb@kernel.org> From: Zenghui Yu Message-ID: <584b7ff1-ecf2-b0ec-cea3-ccc29902f43a@huawei.com> Date: Mon, 16 Nov 2020 21:09:52 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <724c43702b52aac0d3c9beb9604d1bfb@kernel.org> Content-Language: en-US X-Originating-IP: [10.174.185.179] X-CFilter-Loop: Reflected Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu SGkgTWFyYywKCk9uIDIwMjAvMTEvMTYgMTowNCwgTWFyYyBaeW5naWVyIHdyb3RlOgo+IEhpIFpl bmdodWksCj4gCj4gT24gMjAyMC0xMS0xMyAxNDoyOCwgWmVuZ2h1aSBZdSB3cm90ZToKPj4gSXQn cyBleHBlY3RlZCB0aGF0IHVzZXJzIHdpbGwgYWNjZXNzIHJlZ2lzdGVycyBpbiB0aGUgcmVkaXN0 cmlidXRvciAqaWYqCj4+IHRoZSBSRCBoYXMgYmVlbiBpbml0aWFsaXplZCBwcm9wZXJseS4gVW5m b3J0dW5hdGVseSB1c2Vyc3BhY2UgY2FuIGJlIAo+PiBib2d1cwo+PiBlbm91Z2ggdG8gYWNjZXNz IHJlZ2lzdGVycyBiZWZvcmUgc2V0dGluZyB0aGUgUkQgYmFzZSBhZGRyZXNzLCBhbmQgS1ZNCj4+ IGltcGxpY2l0bHkgYWxsb3dzIGl0ICh3ZSBoYW5kbGUgdGhlIGFjY2VzcyBhbnl3YXksIHJlZ2Fy ZGxlc3Mgb2Ygd2hldGhlcgo+PiB0aGUgYmFzZSBhZGRyZXNzIGlzIHNldCkuCj4+Cj4+IEJhZCB0 aGluZyBoYXBwZW5zIHdoZW4gd2UncmUgaGFuZGxpbmcgdGhlIHVzZXIgcmVhZCBvZiBHSUNSX1RZ UEVSLiBXZSBlbmQKPj4gdXAgd2l0aCBhbiBvb3BzIHdoZW4gZGVmZXJlbmNpbmcgdGhlIHVuc2V0 IHJkcmVnLi4uCj4+Cj4+IMKgwqDCoMKgZ3BhX3QgbGFzdF9yZGlzdF90eXBlciA9IHJkcmVnLT5i YXNlICsgR0lDUl9UWVBFUiArCj4+IMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgKHJkcmVnLT5mcmVl X2luZGV4IC0gMSkgKiBLVk1fVkdJQ19WM19SRURJU1RfU0laRTsKPj4KPj4gRml4IHRoaXMgaXNz dWUgYnkgaW5mb3JtaW5nIHVzZXJzcGFjZSB3aGF0IGhhZCBnb25lIHdyb25nICgtRU5YSU8pLgo+ IAo+IEknbSB3b3JyaWVkIGFib3V0IHRoZSAiaW1wbGljaXQiIGFzcGVjdCBvZiB0aGUgYWNjZXNz IHRoYXQgdGhpcyBwYXRjaAo+IG5vdyBmb3JiaWRzLgo+IAo+IFRoZSBwcm9ibGVtIGlzIHRoYXQg dGhlIGV4aXN0aW5nIGRvY3VtZW50YXRpb24gZG9lc24ndCBjb3ZlciB0aGlzIGNhc2UsID4gYW5k IC1FTlhJTydzICJHZXR0aW5nIG9yIHNldHRpbmcgdGhpcyByZWdpc3RlciBpcyBub3QgeWV0IHN1 cHBvcnRlZCIKPiBpcyB3YXkgdG9vIHZhZ3VlLgoKSW5kZWVkLiBIb3cgYWJvdXQgY2hhbmdpbmcg dG8KCiAgICAgLUVOWElPICBHZXR0aW5nIG9yIHNldHRpbmcgdGhpcyByZWdpc3RlciBpcyBub3Qg eWV0IHN1cHBvcnRlZAogICAgICAgICAgICAgb3IgVkdJQyBub3QgcHJvcGVybHkgY29uZmlndXJl ZCAoZS5nLiwgW1JlXURpc3RyaWJ1dG9yIGJhc2UKICAgICAgICAgICAgIGFkZHJlc3MgaXMgdW5r bm93bikKCj4gVGhlcmUgaXMgYSBwcmVjZWRlbnQgd2l0aCB0aGUgSVRTLCBidXQgdGhhdCdzIAo+ IHVuZG9jdW1lbnRlZAo+IGFzIHdlbGwuIEFsc28sIGhvdyBhYm91dCB2Mj8gSWYgdGhhdCdzIHRo ZSB3YXN5IHdlIGFyZSBnb2luZyB0byBmaXggdGhpcywKPiB3ZSBhbHNvIG5uZWQgdG8gYmVlZiB1 cCB0aGUgZG9jdW1lbnRhdGlvbi4KClN1cmUsIEkgcGxhbiB0byBkbyBzbyBhbmQgaG9wZSBpdCB3 b24ndCBicmVhayB0aGUgZXhpc3RpbmcgdXNlcnNwYWNlLgoKPiBPZiBjb3Vyc2UsIHRoZSBvdGhl ciBob3JyaWJsZSB3YXkgdG8gYWRkcmVzcyB0aGUgaXNzdWUgaXMgdG8gcmV0dXJuIGEgdmFsdWUK PiB0aGF0IGRvZXNuJ3QgaGF2ZSB0aGUgTGFzdCBiaXQgc2V0LCBzaW5jZSB3ZSBjYW4ndCBzeW50 aGV0aXNlIGl0LiBJdCAKPiBkb2Vzbid0Cj4gY2hhbmdlIHRoZSB1c2Vyc3BhY2UgQVBJLCBhbmQg SSBjYW4gZXZlbiBmaW5kIHNvbWUgKGFkbWl0dGVkbHnCoCB0d2lzdGVkKQo+IGxvZ2ljIHRvIGl0 IChzaW5jZSB0aGVyZSBpcyBubyBiYXNlIGFkZHJlc3MsIHRoZXJlIGlzIG5vIGxhc3QgUkQuLi4p LgoKSSdtIGZpbmUgd2l0aCBpdC4gQnV0IEknbSBhZnJhaWQgdGhhdCB0aGVyZSBtaWdodCBiZSBv dGhlciBpc3N1ZXMgZHVlIHRvCnRoZSAidW5leHBlY3RlZCIgYWNjZXNzZXMgc2luY2UgSSBoYXZl bid0IHRlc3RlZCB3aXRoIGFsbCByZWdpc3RlcnMgZnJvbQp1c2Vyc3BhY2UuCgpNeSB0YWtlIGlz IHRoYXQgb25seSBpZiB0aGUgIltSZV1EaXN0cmlidXRvciBiYXNlIGFkZHJlc3MiIGlzIHNwZWNp ZmllZAppbiB0aGUgc3lzdGVtIG1lbW9yeSBtYXAsIHdpbGwgdGhlIHVzZXItcHJvdmlkZWQga3Zt X2RldmljZV9hdHRyLm9mZnNldAptYWtlIHNlbnNlLiBBbmQgd2UgY2FuIHRoZW4gaGFuZGxlIHRo ZSBhY2Nlc3MgdG8gdGhlIHJlZ2lzdGVyIHdoaWNoIGlzCmRlZmluZWQgYnkgImJhc2UgYWRkcmVz cyArIG9mZnNldCIuCgoKVGhhbmtzLApaZW5naHVpCl9fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fCmt2bWFybSBtYWlsaW5nIGxpc3QKa3ZtYXJtQGxpc3RzLmNz LmNvbHVtYmlhLmVkdQpodHRwczovL2xpc3RzLmNzLmNvbHVtYmlhLmVkdS9tYWlsbWFuL2xpc3Rp bmZvL2t2bWFybQo=