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Tue, 18 Oct 2022 06:42:12 -0700 (PDT) Message-ID: <4c9e1602-25e4-6489-e4da-3b1b7fda5302@linaro.org> Date: Tue, 18 Oct 2022 15:42:08 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.13.1 Subject: Re: [PATCH v4 07/25] KVM: arm64: Prevent the donation of no-map pages Content-Language: en-US To: Will Deacon , kvmarm@lists.linux.dev Cc: Sean Christopherson , Vincent Donnefort , Alexandru Elisei , Catalin Marinas , James Morse , Chao Peng , Quentin Perret , Suzuki K Poulose , Mark Rutland , Fuad Tabba , Oliver Upton , Marc Zyngier , kernel-team@android.com, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20221017115209.2099-1-will@kernel.org> <20221017115209.2099-8-will@kernel.org> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= In-Reply-To: <20221017115209.2099-8-will@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221018_064218_725485_E0C8F5C8 X-CRM114-Status: GOOD ( 22.18 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org SGkgV2lsbCAmIFF1ZW50aW4sCgpPbiAxNy8xMC8yMiAxMzo1MSwgV2lsbCBEZWFjb24gd3JvdGU6 Cj4gRnJvbTogUXVlbnRpbiBQZXJyZXQgPHFwZXJyZXRAZ29vZ2xlLmNvbT4KPiAKPiBNZW1vcnkg cmVnaW9ucyBtYXJrZWQgYXMgIm5vLW1hcCIgaW4gdGhlIGhvc3QgZGV2aWNlLXRyZWUgcm91dGlu ZWx5Cj4gaW5jbHVkZSBUcnVzdFpvbmUgY2FyZXZvdXRzIGFuZCBETUEgcG9vbHMuIEFsdGhvdWdo IGRvbmF0aW5nIHN1Y2ggcGFnZXMKClR5cG8gImNhcnZlLW91dHMiPwoKPiB0byB0aGUgaHlwZXJ2 aXNvciBtYXkgbm90IGJyZWFjaCBjb25maWRlbnRpYWxpdHksIGl0IGNvdWxkIGJlIHVzZWQgdG8K PiBjb3JydXB0IGl0cyBzdGF0ZSBpbiB1bmNvbnRyb2xsYWJsZSB3YXlzLiBUbyBwcmV2ZW50IHRo aXMsIGxldCdzIGJsb2NrCj4gaG9zdC1pbml0aWF0ZWQgbWVtb3J5IHRyYW5zaXRpb25zIHRhcmdl dGluZyAibm8tbWFwIiBwYWdlcyBhbHRvZ2V0aGVyIGluCj4gblZIRSBwcm90ZWN0ZWQgbW9kZSBh cyB0aGVyZSBzaG91bGQgYmUgbm8gdmFsaWQgcmVhc29uIHRvIGRvIHRoaXMgaW4KPiBjdXJyZW50 IG9wZXJhdGlvbi4KPiAKPiBUaGFua2Z1bGx5LCB0aGUgcEtWTSBFTDIgaHlwZXJ2aXNvciBoYXMg YSBmdWxsIGNvcHkgb2YgdGhlIGhvc3QncyBsaXN0Cj4gb2YgbWVtYmxvY2sgcmVnaW9ucywgc28g d2UgY2FuIGVhc2lseSBjaGVjayBmb3IgdGhlIHByZXNlbmNlIG9mIHRoZQo+IE1FTUJMT0NLX05P TUFQIGZsYWcgb24gYSByZWdpb24gY29udGFpbmluZyBwYWdlcyBiZWluZyBkb25hdGVkIGZyb20g dGhlCj4gaG9zdC4KPiAKPiBUZXN0ZWQtYnk6IFZpbmNlbnQgRG9ubmVmb3J0IDx2ZG9ubmVmb3J0 QGdvb2dsZS5jb20+Cj4gU2lnbmVkLW9mZi1ieTogUXVlbnRpbiBQZXJyZXQgPHFwZXJyZXRAZ29v Z2xlLmNvbT4KPiBTaWduZWQtb2ZmLWJ5OiBXaWxsIERlYWNvbiA8d2lsbEBrZXJuZWwub3JnPgo+ IC0tLQo+ICAgYXJjaC9hcm02NC9rdm0vaHlwL252aGUvbWVtX3Byb3RlY3QuYyB8IDIyICsrKysr KysrKysrKysrKystLS0tLS0KPiAgIDEgZmlsZSBjaGFuZ2VkLCAxNiBpbnNlcnRpb25zKCspLCA2 IGRlbGV0aW9ucygtKQo+IAo+IGRpZmYgLS1naXQgYS9hcmNoL2FybTY0L2t2bS9oeXAvbnZoZS9t ZW1fcHJvdGVjdC5jIGIvYXJjaC9hcm02NC9rdm0vaHlwL252aGUvbWVtX3Byb3RlY3QuYwo+IGlu ZGV4IGMzMDQwMjczNzU0OC4uYTcxNTZmZDEzYmM4IDEwMDY0NAo+IC0tLSBhL2FyY2gvYXJtNjQv a3ZtL2h5cC9udmhlL21lbV9wcm90ZWN0LmMKPiArKysgYi9hcmNoL2FybTY0L2t2bS9oeXAvbnZo ZS9tZW1fcHJvdGVjdC5jCj4gQEAgLTE5Myw3ICsxOTMsNyBAQCBzdHJ1Y3Qga3ZtX21lbV9yYW5n ZSB7Cj4gICAJdTY0IGVuZDsKPiAgIH07Cgo+ICAgYm9vbCBhZGRyX2lzX21lbW9yeShwaHlzX2Fk ZHJfdCBwaHlzKQo+ICAgewo+ICAgCXN0cnVjdCBrdm1fbWVtX3JhbmdlIHJhbmdlOwo+ICAgCj4g LQlyZXR1cm4gZmluZF9tZW1fcmFuZ2UocGh5cywgJnJhbmdlKTsKPiArCXJldHVybiAhIWZpbmRf bWVtX3JhbmdlKHBoeXMsICZyYW5nZSk7Cj4gK30KPiArCj4gK3N0YXRpYyBib29sIGFkZHJfaXNf YWxsb3dlZF9tZW1vcnkocGh5c19hZGRyX3QgcGh5cykKPiArewo+ICsJc3RydWN0IG1lbWJsb2Nr X3JlZ2lvbiAqcmVnOwo+ICsJc3RydWN0IGt2bV9tZW1fcmFuZ2UgcmFuZ2U7Cj4gKwo+ICsJcmVn ID0gZmluZF9tZW1fcmFuZ2UocGh5cywgJnJhbmdlKTsKPiArCj4gKwlyZXR1cm4gcmVnICYmICEo cmVnLT5mbGFncyAmIE1FTUJMT0NLX05PTUFQKTsKPiAgIH0KPiAgIAo+ICAgc3RhdGljIGJvb2wg aXNfaW5fbWVtX3JhbmdlKHU2NCBhZGRyLCBzdHJ1Y3Qga3ZtX21lbV9yYW5nZSAqcmFuZ2UpCj4g QEAgLTM0Niw3ICszNTYsNyBAQCBzdGF0aWMgYm9vbCBob3N0X3N0YWdlMl9mb3JjZV9wdGVfY2Io dTY0IGFkZHIsIHU2NCBlbmQsIGVudW0ga3ZtX3BndGFibGVfcHJvdCBwcgo+ICAgc3RhdGljIGlu dCBob3N0X3N0YWdlMl9pZG1hcCh1NjQgYWRkcikKPiAgIHsKPiAgIAlzdHJ1Y3Qga3ZtX21lbV9y YW5nZSByYW5nZTsKPiAtCWJvb2wgaXNfbWVtb3J5ID0gZmluZF9tZW1fcmFuZ2UoYWRkciwgJnJh bmdlKTsKPiArCWJvb2wgaXNfbWVtb3J5ID0gISFmaW5kX21lbV9yYW5nZShhZGRyLCAmcmFuZ2Up OwoKV2UgZG9uJ3QgcmVwbGFjZSBieSBhZGRyX2lzX2FsbG93ZWRfbWVtb3J5KCkgYmVjYXVzZSB3 ZSBzdGlsbCB1c2UKJnJhbmdlLCBPSy4KCj4gICAJZW51bSBrdm1fcGd0YWJsZV9wcm90IHByb3Q7 Cj4gICAJaW50IHJldDsKPiAgIAo+IEBAIC00MjQsNyArNDM0LDcgQEAgc3RhdGljIGludCBfX2No ZWNrX3BhZ2Vfc3RhdGVfdmlzaXRvcih1NjQgYWRkciwgdTY0IGVuZCwgdTMyIGxldmVsLAo+ICAg CXN0cnVjdCBjaGVja193YWxrX2RhdGEgKmQgPSBhcmc7Cj4gICAJa3ZtX3B0ZV90IHB0ZSA9ICpw dGVwOwo+ICAgCj4gLQlpZiAoa3ZtX3B0ZV92YWxpZChwdGUpICYmICFhZGRyX2lzX21lbW9yeShr dm1fcHRlX3RvX3BoeXMocHRlKSkpCj4gKwlpZiAoa3ZtX3B0ZV92YWxpZChwdGUpICYmICFhZGRy X2lzX2FsbG93ZWRfbWVtb3J5KGt2bV9wdGVfdG9fcGh5cyhwdGUpKSkKPiAgIAkJcmV0dXJuIC1F SU5WQUw7CgpSZXZpZXdlZC1ieTogUGhpbGlwcGUgTWF0aGlldS1EYXVkw6kgPHBoaWxtZEBsaW5h cm8ub3JnPgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18K bGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZy YWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGlu dXgtYXJtLWtlcm5lbAo=