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Mon, 13 Mar 2023 10:21:11 -0700 (PDT) Date: Mon, 13 Mar 2023 10:21:09 -0700 In-Reply-To: Mime-Version: 1.0 References: <20230313091425.1962708-1-maz@kernel.org> <20230313091425.1962708-2-maz@kernel.org> Message-ID: Subject: Re: [PATCH 1/2] KVM: arm64: Disable interrupts while walking userspace PTs From: Sean Christopherson To: David Matlack Cc: Marc Zyngier , kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, James Morse , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Ard Biesheuvel , Will Deacon , Quentin Perret , stable@vger.kernel.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230313_102114_180071_599F1C7D X-CRM114-Status: GOOD ( 24.31 ) 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-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gTW9uLCBNYXIgMTMsIDIwMjMsIERhdmlkIE1hdGxhY2sgd3JvdGU6Cj4gT24gTW9uLCBNYXIg MTMsIDIwMjMgYXQgODo1M+KAr0FNIFNlYW4gQ2hyaXN0b3BoZXJzb24gPHNlYW5qY0Bnb29nbGUu Y29tPiB3cm90ZToKPiA+Cj4gPiArRGF2aWQKPiA+Cj4gPiBPbiBNb24sIE1hciAxMywgMjAyMywg TWFyYyBaeW5naWVyIHdyb3RlOgo+ID4gPiBkaWZmIC0tZ2l0IGEvYXJjaC9hcm02NC9rdm0vbW11 LmMgYi9hcmNoL2FybTY0L2t2bS9tbXUuYwo+ID4gPiBpbmRleCA3MTEzNTg3MjIyZmYuLmQ3Yjhi MjU5NDJkZiAxMDA2NDQKPiA+ID4gLS0tIGEvYXJjaC9hcm02NC9rdm0vbW11LmMKPiA+ID4gKysr IGIvYXJjaC9hcm02NC9rdm0vbW11LmMKPiA+ID4gQEAgLTY2NiwxNCArNjY2LDIzIEBAIHN0YXRp YyBpbnQgZ2V0X3VzZXJfbWFwcGluZ19zaXplKHN0cnVjdCBrdm0gKmt2bSwgdTY0IGFkZHIpCj4g PiA+ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIENPTkZJR19QR1RBQkxFX0xFVkVM UyksCj4gPiA+ICAgICAgICAgICAgICAgLm1tX29wcyAgICAgICAgID0gJmt2bV91c2VyX21tX29w cywKPiA+ID4gICAgICAgfTsKPiA+ID4gKyAgICAgdW5zaWduZWQgbG9uZyBmbGFnczsKPiA+ID4g ICAgICAga3ZtX3B0ZV90IHB0ZSA9IDA7ICAgICAgLyogS2VlcCBHQ0MgcXVpZXQuLi4gKi8KPiA+ ID4gICAgICAgdTMyIGxldmVsID0gfjA7Cj4gPiA+ICAgICAgIGludCByZXQ7Cj4gPiA+Cj4gPiA+ ICsgICAgIC8qCj4gPiA+ICsgICAgICAqIERpc2FibGUgSVJRcyBzbyB0aGF0IHdlIGhhemFyZCBh Z2FpbnN0IGEgY29uY3VycmVudAo+ID4gPiArICAgICAgKiB0ZWFyZG93biBvZiB0aGUgdXNlcnNw YWNlIHBhZ2UgdGFibGVzICh3aGljaCByZWxpZXMgb24KPiA+ID4gKyAgICAgICogSVBJLWluZyB0 aHJlYWRzKS4KPiA+ID4gKyAgICAgICovCj4gPiA+ICsgICAgIGxvY2FsX2lycV9zYXZlKGZsYWdz KTsKPiA+ID4gICAgICAgcmV0ID0ga3ZtX3BndGFibGVfZ2V0X2xlYWYoJnBndCwgYWRkciwgJnB0 ZSwgJmxldmVsKTsKPiA+ID4gLSAgICAgVk1fQlVHX09OKHJldCk7Cj4gPiA+IC0gICAgIFZNX0JV R19PTihsZXZlbCA+PSBLVk1fUEdUQUJMRV9NQVhfTEVWRUxTKTsKPiA+ID4gLSAgICAgVk1fQlVH X09OKCEocHRlICYgUFRFX1ZBTElEKSk7Cj4gPiA+ICsgICAgIGxvY2FsX2lycV9yZXN0b3JlKGZs YWdzKTsKPiA+ID4gKwo+ID4gPiArICAgICAvKiBPb3BzLCB0aGUgdXNlcnNwYWNlIFBUcyBhcmUg Z29uZS4uLiAqLwo+ID4gPiArICAgICBpZiAocmV0IHx8IGxldmVsID49IEtWTV9QR1RBQkxFX01B WF9MRVZFTFMgfHwgIShwdGUgJiBQVEVfVkFMSUQpKQo+ID4gPiArICAgICAgICAgICAgIHJldHVy biAtRUZBVUxUOwo+ID4KPiA+IEkgZG9uJ3QgdGhpbmsgdGhpcyBzaG91bGQgcmV0dXJuIC1FRkFV TFQgYWxsIHRoZSB3YXkgb3V0IHRvIHVzZXJzcGFjZS4gIFVubGVzcwo+ID4gYXJtNjQgZGlmZmVy cyBmcm9tIHg4NiBpbiB0ZXJtcyBvZiBob3cgdGhlIHVzZXJzcGFjZSBwYWdlIHRhYmxlcyBhcmUg bWFuYWdlZCwgbm90Cj4gPiBoYXZpbmcgYSB2YWxpZCB0cmFuc2xhdGlvbiBfcmlnaHQgbm93XyBk b2Vzbid0IG1lYW4gdGhhdCBvbmUgY2FuJ3QgYmUgY3JlYXRlZCBpbgo+ID4gdGhlIGZ1dHVyZSwg ZS5nLiBieSB3YXkgb2YgYSBzdWJzZXF1ZW50IGh2YV90b19wZm4oKS4KPiA+Cj4gPiBGV0lXLCB0 aGUgYXBwcm9hY2ggeDg2IHRha2VzIGlzIHRvIGluc3RhbGwgYSA0S2lCIChzbWFsbGVzdCBncmFu dWFsZSkgdHJhbnNsYXRpb24sCj4gCj4gSWYgSSdtIHJlYWRpbmcgdGhlIEFSTSBjb2RlIGNvcnJl Y3RseSwgcmV0dXJuaW5nIC1FRkFVTFQgaGVyZSB3aWxsCj4gaGF2ZSB0aGF0IGVmZmVjdC4gZ2V0 X3VzZXJfbWFwcGluZ19zaXplKCkgaXMgb25seSBjYWxsZWQgYnkKPiB0cmFuc3BhcmVudF9odWdl cGFnZV9hZGp1c3QoKSB3aGljaCByZXR1cm5zIFBBR0VfU0laRSBpZgo+IGdldF91c2VyX21hcHBp bmdfc2l6ZSgpIHJldHVybnMgYW55dGhpbmcgbGVzcyB0aGFuIFBNRF9TSVpFLgoKTm8sIHRoaXMg cGF0Y2ggYWRkcwoKKyAgICAgICAgICAgICAgIGludCBzeiA9IGdldF91c2VyX21hcHBpbmdfc2l6 ZShrdm0sIGh2YSk7CisKKyAgICAgICAgICAgICAgIGlmIChzeiA8IDApCisgICAgICAgICAgICAg ICAgICAgICAgIHJldHVybiBzejsKKworICAgICAgICAgICAgICAgaWYgKHN6IDwgUE1EX1NJWkUp CisgICAgICAgICAgICAgICAgICAgICAgIHJldHVybiBQQUdFX1NJWkU7CisKCmFuZCAKCiAgICAg ICAgICAgICAgICAgICAgICAgIHZtYV9wYWdlc2l6ZSA9IHRyYW5zcGFyZW50X2h1Z2VwYWdlX2Fk anVzdChrdm0sIG1lbXNsb3QsCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgICBodmEsICZwZm4sCiAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAmZmF1bHRf aXBhKTsKKworICAgICAgICAgICAgICAgaWYgKHZtYV9wYWdlc2l6ZSA8IDApIHsKKyAgICAgICAg ICAgICAgICAgICAgICAgcmV0ID0gdm1hX3BhZ2VzaXplOworICAgICAgICAgICAgICAgICAgICAg ICBnb3RvIG91dF91bmxvY2s7CisgICAgICAgICAgICAgICB9CgpfX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlz dApsaW51eC1hcm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJh ZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==