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Tue, 17 Nov 2020 10:51:09 +0000 MIME-Version: 1.0 Date: Tue, 17 Nov 2020 10:51:09 +0000 From: Marc Zyngier To: Auger Eric Subject: Re: [PATCH 1/2] KVM: arm64: vgic: Forbid invalid userspace Redistributor accesses In-Reply-To: <5ba4a98e-276b-2462-0580-fe0e007e9b38@redhat.com> References: <20201113142801.1659-1-yuzenghui@huawei.com> <20201113142801.1659-2-yuzenghui@huawei.com> <724c43702b52aac0d3c9beb9604d1bfb@kernel.org> <584b7ff1-ecf2-b0ec-cea3-ccc29902f43a@huawei.com> <7e58200c-814e-3598-155a-9a7e6cc24374@huawei.com> <5ba4a98e-276b-2462-0580-fe0e007e9b38@redhat.com> User-Agent: Roundcube Webmail/1.4.9 Message-ID: <6f4312dbedd6c1d8fa88dc0fc5adcb5d@kernel.org> X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: eric.auger@redhat.com, yuzenghui@huawei.com, suzuki.poulose@arm.com, linux-kernel@vger.kernel.org, james.morse@arm.com, linux-arm-kernel@lists.infradead.org, wanghaibin.wang@huawei.com, zhukeqian1@huawei.com, kvmarm@lists.cs.columbia.edu, julien.thierry.kdev@gmail.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Cc: linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org 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 T24gMjAyMC0xMS0xNyAwOTo1OSwgQXVnZXIgRXJpYyB3cm90ZToKPiBIaSBNYXJjLAo+IAo+IE9u IDExLzE3LzIwIDk6NDkgQU0sIE1hcmMgWnluZ2llciB3cm90ZToKPj4gSGkgWmVuZ2h1aSwKPj4g Cj4+IE9uIDIwMjAtMTEtMTYgMTQ6NTcsIFplbmdodWkgWXUgd3JvdGU6Cj4+PiBIaSBNYXJjLAo+ Pj4gCj4+PiBPbiAyMDIwLzExLzE2IDIyOjEwLCBNYXJjIFp5bmdpZXIgd3JvdGU6Cj4+Pj4+IE15 IHRha2UgaXMgdGhhdCBvbmx5IGlmIHRoZSAiW1JlXURpc3RyaWJ1dG9yIGJhc2UgYWRkcmVzcyIg aXMgCj4+Pj4+IHNwZWNpZmllZAo+Pj4+PiBpbiB0aGUgc3lzdGVtIG1lbW9yeSBtYXAsIHdpbGwg dGhlIHVzZXItcHJvdmlkZWQgCj4+Pj4+IGt2bV9kZXZpY2VfYXR0ci5vZmZzZXQKPj4+Pj4gbWFr ZSBzZW5zZS4gQW5kIHdlIGNhbiB0aGVuIGhhbmRsZSB0aGUgYWNjZXNzIHRvIHRoZSByZWdpc3Rl ciB3aGljaCAKPj4+Pj4gaXMKPj4+Pj4gZGVmaW5lZCBieSAiYmFzZSBhZGRyZXNzICsgb2Zmc2V0 Ii4KPj4+PiAKPj4+PiBJJ2QgdGVuZCB0byBhZ3JlZSwgYnV0IGl0IGlzIGp1c3QgdGhhdCB0aGlz IGlzIGEgbGFyZ2UgY2hhbmdlIGF0IAo+Pj4+IC1yYzQuCj4+Pj4gSSdkIHJhdGhlciBoYXZlIGEg cXVpY2sgZml4IGZvciA1LjEwLCBhbmQgYSBtb3JlIGludmFzaXZlIGNoYW5nZSBmb3IKPj4+PiA1 LjExLAo+Pj4+IHNwYW5uaW5nIGFsbCB0aGUgcG9zc2libGUgdmdpYyBkZXZpY2VzLgo+Pj4gCj4+ PiBTbyB5b3UgcHJlZmVyIGZpeGluZyBpdCBieSAicmV0dXJuIGEgdmFsdWUgdGhhdCBkb2Vzbid0 IGhhdmUgdGhlIExhc3QKPj4+IGJpdCBzZXQiIGZvciB2NS4xMD8gSSdtIG9rIHdpdGggaXQgYW5k IGNhbiBzZW5kIHYyIGZvciBpdC4KPj4gCj4+IENvb2wuIFRoYW5rcyBmb3IgdGhhdC4KPj4gCj4+ PiBCdHcsIGxvb2tpbmcgYWdhaW4gYXQgdGhlIHdheSB3ZSBoYW5kbGUgdGhlIHVzZXItcmVhZGlu ZyBvZiAKPj4+IEdJQ1JfVFlQRVIKPj4+IAo+Pj4gwqDCoMKgwqB2Z2ljX21taW9fcmVhZF92M3Jf dHlwZXIodmNwdSwgYWRkciwgbGVuKQo+Pj4gCj4+PiBpdCBzZWVtcyB0aGF0IEBhZGRyIGlzIGFj dHVhbGx5IHRoZSAqb2Zmc2V0KiBvZiBHSUNSX1RZUEVSICgweDAwMDgpIAo+Pj4gYW5kCj4+PiBA YWRkciBpcyB1bmxpa2VseSB0byBiZSBlcXVhbCB0byBsYXN0X3JkaXN0X3R5cGVyLCB3aGljaCBp cyB0aGUgKkdQQSogCj4+PiBvZgo+Pj4gdGhlIGxhc3QgUkQuIExvb2tzIGxpa2UgdGhlIHVzZXIt cmVhZGluZyBvZiBHSUNSX1RZUEVSLkxhc3QgaXMgYWx3YXlzCj4+PiBicm9rZW4/Cj4+IAo+PiBJ IHRoaW5rIHlvdSBhcmUgcmlnaHQuIFNvbWVob3csIHdlIGRvbid0IHNlZW0gdG8gdHJhY2sgdGhl IGluZGV4IG9mCj4+IHRoZSBSRCBpbiB0aGUgcmVnaW9uLCBzbyB3ZSBjYW4gbmV2ZXIgY29tcHV0 ZSB0aGUgYWRkcmVzcyBvZiB0aGUgUkQKPj4gZXZlbiBpZiB0aGUgYmFzZSBhZGRyZXNzIGlzIHNl dC4KPj4gCj4+IExldCdzIGRyb3AgdGhlIHJlcG9ydGluZyBvZiBMYXN0IGZvciB1c2Vyc3BhY2Ug Zm9yIG5vdywgYXMgaXQgbmV2ZXIKPj4gd29ya2VkLiBJZiB5b3UgcG9zdCBhIHBhdGNoIGFkZHJl c3NpbmcgdGhhdCBxdWlja2x5LCBJJ2xsIGdldCBpdCB0bwo+PiBQYW9sbyBieSB0aGUgZW5kIG9m IHRoZSB3ZWVrICh0aGVyZSdzIGFub3RoZXIgZml4IHRoYXQgbmVlZHMgbWVyZ2luZykuCj4+IAo+ PiBFcmljOiBkbyB3ZSBoYXZlIGFueSB0ZXN0IGNvdmVyaW5nIHRoZSB1c2Vyc3BhY2UgQVBJPwo+ IAo+IFNvIGFzIHRoaXMgaXNzdWUgc2VlbXMgcmVsYXRlZCB0byB0aGUgY2hhbmdlcyBtYWRlIHdo ZW4gaW1wbGVtZW50aW5nIAo+IHRoZQo+IG11bHRpcGxlIFJESVNUIHJlZ2lvbnMsIEkgdm9sdW50 ZWVyIHRvIHdyaXRlIHRob3NlIEtWTSBzZWxmdGVzdHMgOi0pCgpZb3UncmUgb24hIDpECgpNb3Jl IHNlcmlvdXNseSwgdGhlcmUgaXMgc2NvcGUgZm9yIGZ1enppbmcgdGhlIGRldmljZSBzYXZlL3Jl c3RvcmUgQVBJLAphcyB3ZSBmaW5kIGJ1Z3MgZXZlcnkgdGltZSBzb21lb25lIGNoYW5nZSB0aGUg Imtub3duIGdvb2QiIG9yZGVyaW5nIHRoYXQKaXMgaW1wbGVtZW50ZWQgaW4gUUVNVS4KCk1heWJl IGl0IG1lYW5zIGdldHRpbmcgcmlkIG9mIHNvbWUgdW5uZWNlc3NhcnkgZmxleGliaWxpdHksIGFz IHByb3Bvc2VkCmJ5IFplbmdodWksIGlmIHdlIGFyZSBjb25maWRlbnQgdGhhdCBubyB1c2Vyc3Bh Y2UgbWFrZXMgdXNlIG9mIGl0LgpBbmQgaW4gdGhlIGZ1dHVyZSwgbWFraW5nIHN1cmUgdGhhdCBu ZXcgQVBJcyBhcmUgcmlnaWQgZW5vdWdoIHRvIGF2b2lkIApzdWNoCmJ1Z3MuCgpUaGFua3MsCgog ICAgICAgICBNLgotLSAKSmF6eiBpcyBub3QgZGVhZC4gSXQganVzdCBzbWVsbHMgZnVubnkuLi4K X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18Ka3ZtYXJtIG1h aWxpbmcgbGlzdAprdm1hcm1AbGlzdHMuY3MuY29sdW1iaWEuZWR1Cmh0dHBzOi8vbGlzdHMuY3Mu Y29sdW1iaWEuZWR1L21haWxtYW4vbGlzdGluZm8va3ZtYXJtCg==