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Wed, 13 Dec 2023 14:25:54 -0800 (PST) X-Google-Smtp-Source: AGHT+IGq5vSBS9iWIl4hhY+47LaF7O2e11U2yVs0UmGQ3dWeLwMn5yVhoe2ukGq+e6/HNoX4k1QrCw== X-Received: by 2002:a05:600c:518a:b0:40b:5e4a:2354 with SMTP id fa10-20020a05600c518a00b0040b5e4a2354mr4800760wmb.86.1702506354019; Wed, 13 Dec 2023 14:25:54 -0800 (PST) Received: from starship ([77.137.131.62]) by smtp.gmail.com with ESMTPSA id m27-20020a05600c3b1b00b0040b38292253sm24509354wms.30.2023.12.13.14.25.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Dec 2023 14:25:53 -0800 (PST) Message-ID: <5ca5592b21131f515e296afae006e5bb28b1fb87.camel@redhat.com> Subject: Re: [PATCH v4 10/12] KVM: x86: never write to memory from kvm_vcpu_check_block() From: Maxim Levitsky To: Sean Christopherson , Jim Mattson Cc: 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 00:25:50 +0200 In-Reply-To: References: <20220921003201.1441511-11-seanjc@google.com> <20231207010302.2240506-1-jmattson@google.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_142558_928672_5E7C2469 X-CRM114-Status: GOOD ( 22.60 ) 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 T24gVHVlLCAyMDIzLTEyLTEyIGF0IDA3OjI4IC0wODAwLCBTZWFuIENocmlzdG9waGVyc29uIHdy b3RlOgo+IE9uIFN1biwgRGVjIDEwLCAyMDIzLCBKaW0gTWF0dHNvbiB3cm90ZToKPiA+IE9uIFRo dSwgRGVjIDcsIDIwMjMgYXQgODoyMeKAr0FNIFNlYW4gQ2hyaXN0b3BoZXJzb24gPHNlYW5qY0Bn b29nbGUuY29tPiB3cm90ZToKPiA+ID4gRG9oLiAgV2UgZ290IHRoZSBsZXNzIG9idmlvdXMgY2Fz ZXMgYW5kIG1pc3NlZCB0aGUgb2J2aW91cyBvbmUuCj4gPiA+IAo+ID4gPiBVZ2gsIGFuZCB3ZSBh bHNvIG1pc3NlZCBhIHJlbGF0ZWQgbWVzcyBpbiBrdm1fZ3Vlc3RfYXBpY19oYXNfaW50ZXJydXB0 KCkuICBUaGF0Cj4gPiA+IHRoaW5nIHNob3VsZCByZWFsbHkgYmUgZm9sZGVkIGludG8gdm14X2hh c19uZXN0ZWRfZXZlbnRzKCkuCj4gPiA+IAo+ID4gPiBHb29kIGdyYXZ5LiAgQW5kIHZteF9pbnRl cnJ1cHRfYmxvY2tlZCgpIGRvZXMgdGhlIHdyb25nIHRoaW5nIGJlY2F1c2UgdGhhdAo+ID4gPiBz cGVjaWZpY2FsbHkgY2hlY2tzIGlmIEwxIGludGVycnVwdHMgYXJlIGJsb2NrZWQuCj4gPiA+IAo+ ID4gPiBDb21waWxlIHRlc3RlZCBvbmx5LCBhbmQgZGVmaW5pdGVseSBuZWVkcyB0byBiZSBjaHVu a2VkIGludG8gbXVsdGlwbGUgcGF0Y2hlcywKPiA+ID4gYnV0IEkgdGhpbmsgc29tZXRoaW5nIGxp a2UgdGhpcyBtZXNzPwo+ID4gCj4gPiBUaGUgcHJvcG9zZWQgcGF0Y2ggZG9lcyBub3QgZml4IHRo ZSBwcm9ibGVtLiBJbiBmYWN0LCBpdCBtZXNzZXMgdGhpbmdzCj4gPiB1cCBzbyBtdWNoIHRoYXQg SSBkb24ndCBnZXQgYW55IHRlc3QgcmVzdWx0cyBiYWNrLgo+IAo+IERyYXQuCj4gCj4gPiBHb29n bGUgaGFzIGFuIGludGVybmFsIEstVS1UIHRlc3QgdGhhdCBkZW1vbnN0cmF0ZXMgdGhlIHByb2Js ZW0uIEkKPiA+IHdpbGwgcG9zdCBpdCBzb29uLgo+IAo+IFJlY2VpdmVkLCBJJ2xsIGRpZyBpbiBz b29uaXNoLCB0aG91Z2ggInNvb25pc2giIG1pZ2h0IHVuZm9ydHVuYXRlbHkgbWlnaHQgbWVhbgo+ IDIwMjQuCj4gCgpIaSwKClNvIHRoaXMgaXMgd2hhdCBJIHRoaW5rOgoKCktWTSBkb2VzIGhhdmUg a3ZtX2d1ZXN0X2FwaWNfaGFzX2ludGVycnVwdCgpIGZvciB0aGlzIGV4YWN0IHB1cnBvc2UsCnRv IGNoZWNrIGlmIG5lc3RlZCBBUElDdiBoYXMgYSBwZW5kaW5nIGludGVycnVwdCBiZWZvcmUgaGFs dGluZy4KCgpIb3dldmVyIHRoZSBwcm9ibGVtIGlzIGJpZ2dlciAtIHdpdGggQVBJQ3Ygd2UgaGF2 ZSBpbiBlc3NlbmNlIDIgcGVuZGluZyBpbnRlcnJ1cHQKYml0bWFwcyAtIHRoZSBQSVIgYW5kIHRo ZSBJUlIsIGFuZCB0byBrbm93IGlmIHRoZSBndWVzdCBoYXMgYSBwZW5kaW5nIGludGVycnVwdApv bmUgaGFzIGluIHRoZW9yeSB0byBjb3B5IFBJUiB0byBJUlIsIHRoZW4gc2VlIGlmIHRoZSBtYXgg aXMgbGFyZ2VyIHRoZW4gdGhlIGN1cnJlbnQgUFBSLgoKU2luY2Ugd2UgZG9uJ3Qgd2FudCB0byB3 cml0ZSB0byBndWVzdCBtZW1vcnksIGFuZCB0aGUgSVJSIGhlcmUgcmVzaWRlcyBpbiB0aGUgZ3Vl c3QgbWVtb3J5LApJIGd1ZXNzIHdlIGhhdmUgdG8gZG8gYSAnZHJ5LXJ1bicgdmVyc2lvbiBvZiAn dm14X2NvbXBsZXRlX25lc3RlZF9wb3N0ZWRfaW50ZXJydXB0JyBhbmQgY2FsbAppdCBmcm9tICBr dm1fZ3Vlc3RfYXBpY19oYXNfaW50ZXJydXB0KCkuCgpXaGF0IGRvIHlvdSB0aGluaz8gSSBjYW4g cHJlcGFyZSBhIHBhdGNoIGZvciB0aGlzLgoKQ2FuIHlvdSBzaGFyZSBhIHJlcHJvZHVjZXIgb3Ig d3JpdGUgYSBuZXcgb25lIHRoYXQgY2FuIGJlIHNoYXJlZD8KCkJlc3QgcmVnYXJkcywKCU1heGlt IExldml0c2t5CgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X18KbGludXgtcmlzY3YgbWFpbGluZyBsaXN0CmxpbnV4LXJpc2N2QGxpc3RzLmluZnJhZGVhZC5v cmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1yaXNj dgo=