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Mon, 27 Oct 2025 17:37:05 -0700 (PDT) Date: Mon, 27 Oct 2025 17:37:03 -0700 In-Reply-To: <55461c549803e08db97528127c29e092c597adc5.camel@intel.com> Mime-Version: 1.0 References: <20251017003244.186495-1-seanjc@google.com> <20251017003244.186495-25-seanjc@google.com> <55461c549803e08db97528127c29e092c597adc5.camel@intel.com> Message-ID: Subject: Re: [PATCH v3 24/25] KVM: TDX: Guard VM state transitions with "all" the locks From: Sean Christopherson To: Kai Huang Cc: "chenhuacai@kernel.org" , "frankja@linux.ibm.com" , "maz@kernel.org" , "borntraeger@linux.ibm.com" , "pjw@kernel.org" , "aou@eecs.berkeley.edu" , "kas@kernel.org" , "maobibo@loongson.cn" , "pbonzini@redhat.com" , "maddy@linux.ibm.com" , "palmer@dabbelt.com" , "imbrenda@linux.ibm.com" , "zhaotianrui@loongson.cn" , "anup@brainfault.org" , "oliver.upton@linux.dev" , "kvm@vger.kernel.org" , "linux-coco@lists.linux.dev" , Yan Y Zhao , "michael.roth@amd.com" , "linux-kernel@vger.kernel.org" , Ira Weiny , "loongarch@lists.linux.dev" , "binbin.wu@linux.intel.com" , "ackerleytng@google.com" , "kvmarm@lists.linux.dev" , "kvm-riscv@lists.infradead.org" , Vishal Annapurve , "linuxppc-dev@lists.ozlabs.org" , Rick P Edgecombe , "linux-mips@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-riscv@lists.infradead.org" , "x86@kernel.org" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251027_173707_156876_1839A2CA X-CRM114-Status: GOOD ( 17.79 ) X-BeenThere: kvm-riscv@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: "kvm-riscv" Errors-To: kvm-riscv-bounces+kvm-riscv=archiver.kernel.org@lists.infradead.org T24gVHVlLCBPY3QgMjgsIDIwMjUsIEthaSBIdWFuZyB3cm90ZToKPiBPbiBUaHUsIDIwMjUtMTAt MTYgYXQgMTc6MzIgLTA3MDAsIFNlYW4gQ2hyaXN0b3BoZXJzb24gd3JvdGU6Cj4gPiBAQCAtMjc4 MSw4ICsyODI3LDYgQEAgaW50IHRkeF92bV9pb2N0bChzdHJ1Y3Qga3ZtICprdm0sIHZvaWQgX191 c2VyICphcmdwKQo+ID4gwqAJaWYgKHIpCj4gPiDCoAkJcmV0dXJuIHI7Cj4gPiDCoAo+ID4gLQln dWFyZChtdXRleCkoJmt2bS0+bG9jayk7Cj4gPiAtCj4gPiDCoAlzd2l0Y2ggKHRkeF9jbWQuaWQp IHsKPiA+IMKgCWNhc2UgS1ZNX1REWF9DQVBBQklMSVRJRVM6Cj4gPiDCoAkJciA9IHRkeF9nZXRf Y2FwYWJpbGl0aWVzKCZ0ZHhfY21kKTsKPiAKPiBJSVJDLCB0aGlzIHBhdGNoIHJlbW92ZXMgZ3Jh YmJpbmcgdGhlIGt2bS0+bG9jayBpbiB0ZHhfdm1faW9jdGwoKSBidXQgb25seQo+IGFkZHMgdGhl ICJiaWcgaGFtbWVyIiB0byB0ZHhfdGRfaW5pdCgpIGFuZCB0ZHhfdGRfZmluYWxpemUoKSwgc28g dGhlCj4gdGR4X2dldF9jYXBhYmlsaXRpZXMoKSBsb3N0IGhvbGRpbmcgdGhlIGt2bS0+bG9jay4K Ck9vaCwgeWVhaCwgbmljZSBjYXRjaCwgdGhhdCBpcyBpbmRlZWQgc2lsbHkgYW5kIHVubmVjZXNz YXJ5IGNodXJuLgoKPiBBcyByZXBsaWVkIGVhcmxpZXIsIEkgdGhpbmsgd2UgY2FuIGp1c3QgaG9s ZCB0aGUgImJpZyBoYW1tZXIiIGluCj4gdGR4X3ZtX2lvY3RsKCk/CgpBY3R1YWxseSwgSSB0aGlu ayB3ZSBjYW4gaGF2ZSBvdXIgY2FrZSBhbmQgZWF0IGl0IHRvby4gIFdpdGggdGhpcyBzbG90dGVk IGluIGFzCmEgcHJlcCBwYXRjaCwgdGhlIGJpZyBoYW1tZXIgY2FuIGxhbmQgZGlyZWN0bHkgaW4g dGR4X3ZtX2lvY3RsKCksIHdpdGhvdXQgYW55CmNoYW5nZSBpbiBmdW5jdGlvbmFsaXR5IGZvciBL Vk1fVERYX0NBUEFCSUxJVElFUy4KCi0tCkZyb206IFNlYW4gQ2hyaXN0b3BoZXJzb24gPHNlYW5q Y0Bnb29nbGUuY29tPgpEYXRlOiBNb24sIDI3IE9jdCAyMDI1IDE3OjMyOjM0IC0wNzAwClN1Ympl Y3Q6IFtQQVRDSF0gS1ZNOiBURFg6IERvbid0IGNvcHkgImNtZCIgYmFjayB0byB1c2Vyc3BhY2Ug Zm9yCiBLVk1fVERYX0NBUEFCSUxJVElFUwoKRG9uJ3QgY29weSB0aGUga3ZtX3RkeF9jbWQgc3Ry dWN0dXJlIGJhY2sgdG8gdXNlcnNwYWNlIHdoZW4gaGFuZGxpbmcKS1ZNX1REWF9DQVBBQklMSVRJ RVMsIGFzIHRkeF9nZXRfY2FwYWJpbGl0aWVzKCkgZG9lc24ndCBtb2RpZnkgaHdfZXJyb3Igb3IK YW55IG90aGVyIGZpZWxkcy4KCk9wcG9ydHVuaXN0aWNhbGx5IGhvaXN0IHRoZSBjYWxsIHRvIHRk eF9nZXRfY2FwYWJpbGl0aWVzKCkgb3V0c2lkZSBvZiB0aGUKa3ZtLT5sb2NrIGNyaXRpY2FsIHNl Y3Rpb24sIGFzIGdldHRpbmcgdGhlIGNhcGFiaWxpdGllcyBkb2Vzbid0IHRvdWNoIHRoZQpWTSBp biBhbnkgd2F5LCBlLmcuIGRvZXNuJ3QgZXZlbiB0YWtlIEBrdm0uCgpTdWdnZXN0ZWQtYnk6IEth aSBIdWFuZyA8a2FpLmh1YW5nQGludGVsLmNvbT4KU2lnbmVkLW9mZi1ieTogU2VhbiBDaHJpc3Rv cGhlcnNvbiA8c2VhbmpjQGdvb2dsZS5jb20+Ci0tLQogYXJjaC94ODYva3ZtL3ZteC90ZHguYyB8 IDYgKysrLS0tCiAxIGZpbGUgY2hhbmdlZCwgMyBpbnNlcnRpb25zKCspLCAzIGRlbGV0aW9ucygt KQoKZGlmZiAtLWdpdCBhL2FyY2gveDg2L2t2bS92bXgvdGR4LmMgYi9hcmNoL3g4Ni9rdm0vdm14 L3RkeC5jCmluZGV4IDE2NDJkYTljMWZhOS4uNDNjMGMzZjZhOGMwIDEwMDY0NAotLS0gYS9hcmNo L3g4Ni9rdm0vdm14L3RkeC5jCisrKyBiL2FyY2gveDg2L2t2bS92bXgvdGR4LmMKQEAgLTI4MDcs MTIgKzI4MDcsMTIgQEAgaW50IHRkeF92bV9pb2N0bChzdHJ1Y3Qga3ZtICprdm0sIHZvaWQgX191 c2VyICphcmdwKQogCWlmIChyKQogCQlyZXR1cm4gcjsKIAorCWlmICh0ZHhfY21kLmlkID09IEtW TV9URFhfQ0FQQUJJTElUSUVTKQorCQlyZXR1cm4gdGR4X2dldF9jYXBhYmlsaXRpZXMoJnRkeF9j bWQpOworCiAJZ3VhcmQobXV0ZXgpKCZrdm0tPmxvY2spOwogCiAJc3dpdGNoICh0ZHhfY21kLmlk KSB7Ci0JY2FzZSBLVk1fVERYX0NBUEFCSUxJVElFUzoKLQkJciA9IHRkeF9nZXRfY2FwYWJpbGl0 aWVzKCZ0ZHhfY21kKTsKLQkJYnJlYWs7CiAJY2FzZSBLVk1fVERYX0lOSVRfVk06CiAJCXIgPSB0 ZHhfdGRfaW5pdChrdm0sICZ0ZHhfY21kKTsKIAkJYnJlYWs7CgpiYXNlLWNvbW1pdDogNjcyNTM3 MjMzYjhkYTJjMjlkY2E3MTU0YmYzYTMyMTFhZjdmNjEyOAotLQoKLS0gCmt2bS1yaXNjdiBtYWls aW5nIGxpc3QKa3ZtLXJpc2N2QGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJh ZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9rdm0tcmlzY3YK