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Wed, 13 Dec 2023 14:44:15 -0800 (PST) X-Google-Smtp-Source: AGHT+IF5EdNQIMrjofmVv1zrJdv8ykEuwHCs2ZxHKs/y4nPdIAePbusp9PWe8bHPWPpyIDEswd1Chw== X-Received: by 2002:a7b:cd91:0:b0:40c:3399:d5a0 with SMTP id y17-20020a7bcd91000000b0040c3399d5a0mr3902490wmj.100.1702507455621; Wed, 13 Dec 2023 14:44:15 -0800 (PST) Received: from starship ([77.137.131.62]) by smtp.gmail.com with ESMTPSA id az23-20020a05600c601700b0040c0902dc22sm22569330wmb.31.2023.12.13.14.44.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Dec 2023 14:44:15 -0800 (PST) Message-ID: <0c86e5ffb65f07cd3e444038d1f0ed39f0f4130a.camel@redhat.com> Subject: Re: [PATCH v4 10/12] KVM: x86: never write to memory from kvm_vcpu_check_block() From: Maxim Levitsky To: Jim Mattson Cc: Sean Christopherson , alexandru.elisei@arm.com, anup@brainfault.org, aou@eecs.berkeley.edu, atishp@atishpatra.org, borntraeger@linux.ibm.com, chenhuacai@kernel.org, david@redhat.com, frankja@linux.ibm.com, imbrenda@linux.ibm.com, james.morse@arm.com, kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, maz@kernel.org, oliver.upton@linux.dev, palmer@dabbelt.com, paul.walmsley@sifive.com, pbonzini@redhat.com, suzuki.poulose@arm.com Date: Thu, 14 Dec 2023 00:44:12 +0200 In-Reply-To: References: <20220921003201.1441511-11-seanjc@google.com> <20231207010302.2240506-1-jmattson@google.com> <5ca5592b21131f515e296afae006e5bb28b1fb87.camel@redhat.com> User-Agent: Evolution 3.36.5 (3.36.5-2.fc32) MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231213_144424_729002_C2E51E96 X-CRM114-Status: GOOD ( 32.96 ) X-BeenThere: linux-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: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gV2VkLCAyMDIzLTEyLTEzIGF0IDE0OjMxIC0wODAwLCBKaW0gTWF0dHNvbiB3cm90ZToKPiBP biBXZWQsIERlYyAxMywgMjAyMyBhdCAyOjI14oCvUE0gTWF4aW0gTGV2aXRza3kgPG1sZXZpdHNr QHJlZGhhdC5jb20+IHdyb3RlOgo+ID4gT24gVHVlLCAyMDIzLTEyLTEyIGF0IDA3OjI4IC0wODAw LCBTZWFuIENocmlzdG9waGVyc29uIHdyb3RlOgo+ID4gPiBPbiBTdW4sIERlYyAxMCwgMjAyMywg SmltIE1hdHRzb24gd3JvdGU6Cj4gPiA+ID4gT24gVGh1LCBEZWMgNywgMjAyMyBhdCA4OjIx4oCv QU0gU2VhbiBDaHJpc3RvcGhlcnNvbiA8c2VhbmpjQGdvb2dsZS5jb20+IHdyb3RlOgo+ID4gPiA+ ID4gRG9oLiAgV2UgZ290IHRoZSBsZXNzIG9idmlvdXMgY2FzZXMgYW5kIG1pc3NlZCB0aGUgb2J2 aW91cyBvbmUuCj4gPiA+ID4gPiAKPiA+ID4gPiA+IFVnaCwgYW5kIHdlIGFsc28gbWlzc2VkIGEg cmVsYXRlZCBtZXNzIGluIGt2bV9ndWVzdF9hcGljX2hhc19pbnRlcnJ1cHQoKS4gIFRoYXQKPiA+ ID4gPiA+IHRoaW5nIHNob3VsZCByZWFsbHkgYmUgZm9sZGVkIGludG8gdm14X2hhc19uZXN0ZWRf ZXZlbnRzKCkuCj4gPiA+ID4gPiAKPiA+ID4gPiA+IEdvb2QgZ3JhdnkuICBBbmQgdm14X2ludGVy cnVwdF9ibG9ja2VkKCkgZG9lcyB0aGUgd3JvbmcgdGhpbmcgYmVjYXVzZSB0aGF0Cj4gPiA+ID4g PiBzcGVjaWZpY2FsbHkgY2hlY2tzIGlmIEwxIGludGVycnVwdHMgYXJlIGJsb2NrZWQuCj4gPiA+ ID4gPiAKPiA+ID4gPiA+IENvbXBpbGUgdGVzdGVkIG9ubHksIGFuZCBkZWZpbml0ZWx5IG5lZWRz IHRvIGJlIGNodW5rZWQgaW50byBtdWx0aXBsZSBwYXRjaGVzLAo+ID4gPiA+ID4gYnV0IEkgdGhp bmsgc29tZXRoaW5nIGxpa2UgdGhpcyBtZXNzPwo+ID4gPiA+IAo+ID4gPiA+IFRoZSBwcm9wb3Nl ZCBwYXRjaCBkb2VzIG5vdCBmaXggdGhlIHByb2JsZW0uIEluIGZhY3QsIGl0IG1lc3NlcyB0aGlu Z3MKPiA+ID4gPiB1cCBzbyBtdWNoIHRoYXQgSSBkb24ndCBnZXQgYW55IHRlc3QgcmVzdWx0cyBi YWNrLgo+ID4gPiAKPiA+ID4gRHJhdC4KPiA+ID4gCj4gPiA+ID4gR29vZ2xlIGhhcyBhbiBpbnRl cm5hbCBLLVUtVCB0ZXN0IHRoYXQgZGVtb25zdHJhdGVzIHRoZSBwcm9ibGVtLiBJCj4gPiA+ID4g d2lsbCBwb3N0IGl0IHNvb24uCj4gPiA+IAo+ID4gPiBSZWNlaXZlZCwgSSdsbCBkaWcgaW4gc29v bmlzaCwgdGhvdWdoICJzb29uaXNoIiBtaWdodCB1bmZvcnR1bmF0ZWx5IG1pZ2h0IG1lYW4KPiA+ ID4gMjAyNC4KPiA+ID4gCj4gPiAKPiA+IEhpLAo+ID4gCj4gPiBTbyB0aGlzIGlzIHdoYXQgSSB0 aGluazoKPiA+IAo+ID4gCj4gPiBLVk0gZG9lcyBoYXZlIGt2bV9ndWVzdF9hcGljX2hhc19pbnRl cnJ1cHQoKSBmb3IgdGhpcyBleGFjdCBwdXJwb3NlLAo+ID4gdG8gY2hlY2sgaWYgbmVzdGVkIEFQ SUN2IGhhcyBhIHBlbmRpbmcgaW50ZXJydXB0IGJlZm9yZSBoYWx0aW5nLgo+ID4gCj4gPiAKPiA+ IEhvd2V2ZXIgdGhlIHByb2JsZW0gaXMgYmlnZ2VyIC0gd2l0aCBBUElDdiB3ZSBoYXZlIGluIGVz c2VuY2UgMiBwZW5kaW5nIGludGVycnVwdAo+ID4gYml0bWFwcyAtIHRoZSBQSVIgYW5kIHRoZSBJ UlIsIGFuZCB0byBrbm93IGlmIHRoZSBndWVzdCBoYXMgYSBwZW5kaW5nIGludGVycnVwdAo+ID4g b25lIGhhcyBpbiB0aGVvcnkgdG8gY29weSBQSVIgdG8gSVJSLCB0aGVuIHNlZSBpZiB0aGUgbWF4 IGlzIGxhcmdlciB0aGVuIHRoZSBjdXJyZW50IFBQUi4KPiA+IAo+ID4gU2luY2Ugd2UgZG9uJ3Qg d2FudCB0byB3cml0ZSB0byBndWVzdCBtZW1vcnksIGFuZCB0aGUgSVJSIGhlcmUgcmVzaWRlcyBp biB0aGUgZ3Vlc3QgbWVtb3J5LAo+ID4gSSBndWVzcyB3ZSBoYXZlIHRvIGRvIGEgJ2RyeS1ydW4n IHZlcnNpb24gb2YgJ3ZteF9jb21wbGV0ZV9uZXN0ZWRfcG9zdGVkX2ludGVycnVwdCcgYW5kIGNh bGwKPiA+IGl0IGZyb20gIGt2bV9ndWVzdF9hcGljX2hhc19pbnRlcnJ1cHQoKS4KPiA+IAo+ID4g V2hhdCBkbyB5b3UgdGhpbms/IEkgY2FuIHByZXBhcmUgYSBwYXRjaCBmb3IgdGhpcy4KPiA+IAo+ ID4gQ2FuIHlvdSBzaGFyZSBhIHJlcHJvZHVjZXIgb3Igd3JpdGUgYSBuZXcgb25lIHRoYXQgY2Fu IGJlIHNoYXJlZD8KPiAKPiBTZWUgaHR0cHM6Ly9sb3JlLmtlcm5lbC5vcmcva3ZtLzIwMjMxMjEx MTg1NTUyLjM4NTY4NjItMS1qbWF0dHNvbkBnb29nbGUuY29tLy4KClRoYW5rIHlvdSEKCkJlc3Qg cmVnYXJkcywKCU1heGltIExldml0c2t5Cgo+IAo+ID4gQmVzdCByZWdhcmRzLAo+ID4gICAgICAg ICBNYXhpbSBMZXZpdHNreQo+ID4gCgoKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fCmxpbnV4LXJpc2N2IG1haWxpbmcgbGlzdApsaW51eC1yaXNjdkBsaXN0 cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGlu Zm8vbGludXgtcmlzY3YK