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[89.103.73.235]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3997f9b3f7csm1592933f8f.49.2025.03.21.00.35.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Mar 2025 00:35:50 -0700 (PDT) Mime-Version: 1.0 Date: Fri, 21 Mar 2025 08:35:49 +0100 Message-Id: Cc: "Thomas Gleixner" , "Ingo Molnar" , "Borislav Petkov" , "Dave Hansen" , , "H. Peter Anvin" , "Andrew Morton" , "Liam R. Howlett" , "Vlastimil Babka" , "Lorenzo Stoakes" , "Paul Walmsley" , "Palmer Dabbelt" , "Albert Ou" , "Conor Dooley" , "Rob Herring" , "Krzysztof Kozlowski" , "Arnd Bergmann" , "Christian Brauner" , "Peter Zijlstra" , "Oleg Nesterov" , "Eric Biederman" , "Kees Cook" , "Jonathan Corbet" , "Shuah Khan" , "Jann Horn" , "Conor Dooley" , , , , , , , , , , , , , , , , , , , , , , "Zong Li" , "linux-riscv" To: "Deepak Gupta" From: =?utf-8?q?Radim_Kr=C4=8Dm=C3=A1=C5=99?= Subject: Re: [PATCH v12 22/28] riscv: enable kernel access to shadow stack memory via FWFT sbi call References: <20250314-v5_user_cfi_series-v12-0-e51202b53138@rivosinc.com> <20250314-v5_user_cfi_series-v12-22-e51202b53138@rivosinc.com> In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250321_003553_092894_231C1DFF X-CRM114-Status: GOOD ( 17.66 ) 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 MjAyNS0wMy0yMFQxNTo0Mjo0NC0wNzowMCwgRGVlcGFrIEd1cHRhIDxkZWJ1Z0ByaXZvc2luYy5j b20+Ogo+IE9uIFRodSwgTWFyIDIwLCAyMDI1IGF0IDM6MTDigK9QTSBSYWRpbSBLcsSNbcOhxZkg PHJrcmNtYXJAdmVudGFuYW1pY3JvLmNvbT4gd3JvdGU6Cj4+Cj4+IDIwMjUtMDMtMTRUMTQ6Mzk6 NDEtMDc6MDAsIERlZXBhayBHdXB0YSA8ZGVidWdAcml2b3NpbmMuY29tPjoKPj4gPiBLZXJuZWwg d2lsbCBoYXZlIHRvIHBlcmZvcm0gc2hhZG93IHN0YWNrIG9wZXJhdGlvbnMgb24gdXNlciBzaGFk b3cgc3RhY2suCj4+ID4gTGlrZSBkdXJpbmcgc2lnbmFsIGRlbGl2ZXJ5IGFuZCBzaWdyZXR1cm4s IHNoYWRvdyBzdGFjayB0b2tlbiBtdXN0IGJlCj4+ID4gY3JlYXRlZCBhbmQgdmFsaWRhdGVkIHJl c3BlY3RpdmVseS4gVGh1cyBzaGFkb3cgc3RhY2sgYWNjZXNzIGZvciBrZXJuZWwKPj4gPiBtdXN0 IGJlIGVuYWJsZWQuCj4+Cj4+IFdoeSBjYW4ndCBrZXJuZWwgYWNjZXNzIHRoZSB1c2VyIHNoYWRv dyBzdGFjayB0aHJvdWdoIGFuIGFsaWFzZWQgV1IKPj4gbWFwcGluZz8KPgo+IEl0IGNhbiwgYWx0 aG91Z2ggdGhhdCBvcGVucyB1cCBhIGNhbiBvZiB3b3Jtcy4gSWYgdGhpcyBhbHRlcm5hdGluZwo+ IG1hcHBpbmcgaXMgdXNlciBtb2RlCj4gdGhlbiBlbnN1cmluZyB0aGF0IGFub3RoZXIgdGhyZWF0 IGluIHVzZXJzcGFjZSBjYW4ndCB3cml0ZSB0byB0aGlzCj4gYWRkcmVzcyBpbiB0aGlzIHdpbmRv dwo+IG9mIHNpZ25hbCBoYW5kbGluZy4KClJpZ2h0LCBpdCBtdXN0IG5vdCBiZSB1c2VyIG1vZGUu Cgo+ICAgICAgICAgICAgICAgICAgICAgQSBrZXJuZWwgYWx0ZXJuYXRlIG1hcHBpbmcgY2FuIGJl IGNyZWF0ZWQsIGJ1dAo+IHRoYXQgY2FuIGxlYWQgdG8gYWxsCj4gc29ydHMgb2YgcmVxdWlyZW1l bnRzIG9mIGVuc3VyaW5nIHRoZSBwYWdlIGlzIHBpbm5lZCBkb3duLiBJSVJDLCBJdAo+IGhhcyBi ZWVuIGRlYmF0ZWQKPiBvbiB4ODYgc2hhZG93IHN0YWNrIG1lcmdlIHRpbWUgYXMgd2VsbCBvbiBo b3cgYSBmbGFreSBhbGlhcyBtYXBwaW5nIGFwcHJvYWNoIGNhbgo+IGJlY29tZSBhbmQgd2Vha2Vu IHRoZSB0aHJlYXQgbW9kZWwgaXQgaXMgc3VwcG9zZWQgdG8gcHJvdGVjdCBhZ2FpbnN0LgoKVHJ1 ZS4KCj4gU2ltcGx5IHVzaW5nIGBzc2Ftb3N3YXBgIGlzIHNpbXBsZSBhbmQgc2VydmVzIHRoZSBw dXJwb3NlLiBFbmFibGluZyBzaGFkb3cgc3RhY2sKPiBhY2Nlc3MgZm9yIHRoZSBrZXJuZWwgZG9l c24ndCBoYXZlIGFueSBhZHZlcnNlIGVmZmVjdCBvbiB0aGUga2VybmVsLgoKTWFrZXMgc2Vuc2Uu ICBXZSBqdXN0IGRlcGVuZCBvbiBhbiBleHRyYSBmZWF0dXJlLCBiZWNhdXNlIHdlIHNob3VsZApj b25zaWRlciB0aGUgY2FzZSB3aGVuIE0tbW9kZSBkb2Vzbid0IGFsbG93IFMtbW9kZSBzaGFkb3cg c3RhY2ssIGJ1dApTLW1vZGUgY2FuIGVuYWJsZSBVLW1vZGUgc2hhZG93IHN0YWNrOgoKPj4gPiAt LS0KPj4gPiBkaWZmIC0tZ2l0IGEvYXJjaC9yaXNjdi9rZXJuZWwvaGVhZC5TIGIvYXJjaC9yaXNj di9rZXJuZWwvaGVhZC5TCj4+ID4gQEAgLTMyMCw2ICszMjYsMTIgQEAgU1lNX0NPREVfU1RBUlQo X3N0YXJ0X2tlcm5lbCkKPj4gPiAgICAgICBsYSB0cCwgaW5pdF90YXNrCj4+ID4gICAgICAgbGEg c3AsIGluaXRfdGhyZWFkX3VuaW9uICsgVEhSRUFEX1NJWkUKPj4gPiAgICAgICBhZGRpIHNwLCBz cCwgLVBUX1NJWkVfT05fU1RBQ0sKPj4gPiArICAgICBsaSBhNywgU0JJX0VYVF9GV0ZUCj4+ID4g KyAgICAgbGkgYTYsIFNCSV9FWFRfRldGVF9TRVQKPj4gPiArICAgICBsaSBhMCwgU0JJX0ZXRlRf U0hBRE9XX1NUQUNLCj4+ID4gKyAgICAgbGkgYTEsIDEgLyogZW5hYmxlIHN1cGVydmlzb3IgdG8g YWNjZXNzIHNoYWRvdyBzdGFjayBhY2Nlc3MgKi8KPj4gPiArICAgICBsaSBhMiwgU0JJX0ZXRlRf U0VUX0ZMQUdfTE9DSwo+PiA+ICsgICAgIGVjYWxsCj4+Cj4+IEkgdGhpbmsgdGhlIGVjYWxsIGNh biBmYWlsIGV2ZW4gb24gbWFjaGluZXMgdGhhdCBoYXZlIFppY2Zpc3MsIHNvIGl0Cj4+IHdvdWxk IGJlIGdvb2QgdG8gZGlzYWJsZSB1c2VyIHNoYWRvdyBzdGFjayBpZiB0aGF0IGhhcHBlbnMuCgpf X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1yaXNj diBtYWlsaW5nIGxpc3QKbGludXgtcmlzY3ZAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlz dHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LXJpc2N2Cg==