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Wed, 13 Dec 2023 14:31:54 -0800 (PST) MIME-Version: 1.0 References: <20220921003201.1441511-11-seanjc@google.com> <20231207010302.2240506-1-jmattson@google.com> <5ca5592b21131f515e296afae006e5bb28b1fb87.camel@redhat.com> In-Reply-To: <5ca5592b21131f515e296afae006e5bb28b1fb87.camel@redhat.com> From: Jim Mattson Date: Wed, 13 Dec 2023 14:31:40 -0800 Message-ID: Subject: Re: [PATCH v4 10/12] KVM: x86: never write to memory from kvm_vcpu_check_block() To: Maxim Levitsky 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231213_143208_775940_F4A5C94D X-CRM114-Status: GOOD ( 29.69 ) 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 T24gV2VkLCBEZWMgMTMsIDIwMjMgYXQgMjoyNeKAr1BNIE1heGltIExldml0c2t5IDxtbGV2aXRz a0ByZWRoYXQuY29tPiB3cm90ZToKPgo+IE9uIFR1ZSwgMjAyMy0xMi0xMiBhdCAwNzoyOCAtMDgw MCwgU2VhbiBDaHJpc3RvcGhlcnNvbiB3cm90ZToKPiA+IE9uIFN1biwgRGVjIDEwLCAyMDIzLCBK aW0gTWF0dHNvbiB3cm90ZToKPiA+ID4gT24gVGh1LCBEZWMgNywgMjAyMyBhdCA4OjIx4oCvQU0g U2VhbiBDaHJpc3RvcGhlcnNvbiA8c2VhbmpjQGdvb2dsZS5jb20+IHdyb3RlOgo+ID4gPiA+IERv aC4gIFdlIGdvdCB0aGUgbGVzcyBvYnZpb3VzIGNhc2VzIGFuZCBtaXNzZWQgdGhlIG9idmlvdXMg b25lLgo+ID4gPiA+Cj4gPiA+ID4gVWdoLCBhbmQgd2UgYWxzbyBtaXNzZWQgYSByZWxhdGVkIG1l c3MgaW4ga3ZtX2d1ZXN0X2FwaWNfaGFzX2ludGVycnVwdCgpLiAgVGhhdAo+ID4gPiA+IHRoaW5n IHNob3VsZCByZWFsbHkgYmUgZm9sZGVkIGludG8gdm14X2hhc19uZXN0ZWRfZXZlbnRzKCkuCj4g PiA+ID4KPiA+ID4gPiBHb29kIGdyYXZ5LiAgQW5kIHZteF9pbnRlcnJ1cHRfYmxvY2tlZCgpIGRv ZXMgdGhlIHdyb25nIHRoaW5nIGJlY2F1c2UgdGhhdAo+ID4gPiA+IHNwZWNpZmljYWxseSBjaGVj a3MgaWYgTDEgaW50ZXJydXB0cyBhcmUgYmxvY2tlZC4KPiA+ID4gPgo+ID4gPiA+IENvbXBpbGUg dGVzdGVkIG9ubHksIGFuZCBkZWZpbml0ZWx5IG5lZWRzIHRvIGJlIGNodW5rZWQgaW50byBtdWx0 aXBsZSBwYXRjaGVzLAo+ID4gPiA+IGJ1dCBJIHRoaW5rIHNvbWV0aGluZyBsaWtlIHRoaXMgbWVz cz8KPiA+ID4KPiA+ID4gVGhlIHByb3Bvc2VkIHBhdGNoIGRvZXMgbm90IGZpeCB0aGUgcHJvYmxl bS4gSW4gZmFjdCwgaXQgbWVzc2VzIHRoaW5ncwo+ID4gPiB1cCBzbyBtdWNoIHRoYXQgSSBkb24n dCBnZXQgYW55IHRlc3QgcmVzdWx0cyBiYWNrLgo+ID4KPiA+IERyYXQuCj4gPgo+ID4gPiBHb29n bGUgaGFzIGFuIGludGVybmFsIEstVS1UIHRlc3QgdGhhdCBkZW1vbnN0cmF0ZXMgdGhlIHByb2Js ZW0uIEkKPiA+ID4gd2lsbCBwb3N0IGl0IHNvb24uCj4gPgo+ID4gUmVjZWl2ZWQsIEknbGwgZGln IGluIHNvb25pc2gsIHRob3VnaCAic29vbmlzaCIgbWlnaHQgdW5mb3J0dW5hdGVseSBtaWdodCBt ZWFuCj4gPiAyMDI0Lgo+ID4KPgo+IEhpLAo+Cj4gU28gdGhpcyBpcyB3aGF0IEkgdGhpbms6Cj4K Pgo+IEtWTSBkb2VzIGhhdmUga3ZtX2d1ZXN0X2FwaWNfaGFzX2ludGVycnVwdCgpIGZvciB0aGlz IGV4YWN0IHB1cnBvc2UsCj4gdG8gY2hlY2sgaWYgbmVzdGVkIEFQSUN2IGhhcyBhIHBlbmRpbmcg aW50ZXJydXB0IGJlZm9yZSBoYWx0aW5nLgo+Cj4KPiBIb3dldmVyIHRoZSBwcm9ibGVtIGlzIGJp Z2dlciAtIHdpdGggQVBJQ3Ygd2UgaGF2ZSBpbiBlc3NlbmNlIDIgcGVuZGluZyBpbnRlcnJ1cHQK PiBiaXRtYXBzIC0gdGhlIFBJUiBhbmQgdGhlIElSUiwgYW5kIHRvIGtub3cgaWYgdGhlIGd1ZXN0 IGhhcyBhIHBlbmRpbmcgaW50ZXJydXB0Cj4gb25lIGhhcyBpbiB0aGVvcnkgdG8gY29weSBQSVIg dG8gSVJSLCB0aGVuIHNlZSBpZiB0aGUgbWF4IGlzIGxhcmdlciB0aGVuIHRoZSBjdXJyZW50IFBQ Ui4KPgo+IFNpbmNlIHdlIGRvbid0IHdhbnQgdG8gd3JpdGUgdG8gZ3Vlc3QgbWVtb3J5LCBhbmQg dGhlIElSUiBoZXJlIHJlc2lkZXMgaW4gdGhlIGd1ZXN0IG1lbW9yeSwKPiBJIGd1ZXNzIHdlIGhh dmUgdG8gZG8gYSAnZHJ5LXJ1bicgdmVyc2lvbiBvZiAndm14X2NvbXBsZXRlX25lc3RlZF9wb3N0 ZWRfaW50ZXJydXB0JyBhbmQgY2FsbAo+IGl0IGZyb20gIGt2bV9ndWVzdF9hcGljX2hhc19pbnRl cnJ1cHQoKS4KPgo+IFdoYXQgZG8geW91IHRoaW5rPyBJIGNhbiBwcmVwYXJlIGEgcGF0Y2ggZm9y IHRoaXMuCj4KPiBDYW4geW91IHNoYXJlIGEgcmVwcm9kdWNlciBvciB3cml0ZSBhIG5ldyBvbmUg dGhhdCBjYW4gYmUgc2hhcmVkPwoKU2VlIGh0dHBzOi8vbG9yZS5rZXJuZWwub3JnL2t2bS8yMDIz MTIxMTE4NTU1Mi4zODU2ODYyLTEtam1hdHRzb25AZ29vZ2xlLmNvbS8uCgo+IEJlc3QgcmVnYXJk cywKPiAgICAgICAgIE1heGltIExldml0c2t5Cj4KCl9fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4 LWFybS1rZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9y Zy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK