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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 05/28] riscv: usercfi state for task and save/restore of CSR_SSP on trap entry/exit References: <20250314-v5_user_cfi_series-v12-0-e51202b53138@rivosinc.com> <20250314-v5_user_cfi_series-v12-5-e51202b53138@rivosinc.com> In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250424_051635_393005_BAA463D7 X-CRM114-Status: GOOD ( 19.32 ) 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 MjAyNS0wNC0yM1QxNzoyMzo1Ni0wNzowMCwgRGVlcGFrIEd1cHRhIDxkZWJ1Z0ByaXZvc2luYy5j b20+Ogo+IE9uIFRodSwgQXByIDEwLCAyMDI1IGF0IDAxOjA0OjM5UE0gKzAyMDAsIFJhZGltIEty xI1tw6HFmSB3cm90ZToKPj4yMDI1LTAzLTE0VDE0OjM5OjI0LTA3OjAwLCBEZWVwYWsgR3VwdGEg PGRlYnVnQHJpdm9zaW5jLmNvbT46Cj4+PiBkaWZmIC0tZ2l0IGEvYXJjaC9yaXNjdi9rZXJuZWwv ZW50cnkuUyBiL2FyY2gvcmlzY3Yva2VybmVsL2VudHJ5LlMKPj4+IEBAIC0xNDcsNiArMTQ3LDIw IEBAIFNZTV9DT0RFX1NUQVJUKGhhbmRsZV9leGNlcHRpb24pCj4+Pgo+Pj4gIAlSRUdfTCBzMCwg VEFTS19USV9VU0VSX1NQKHRwKQo+Pj4gIAljc3JyYyBzMSwgQ1NSX1NUQVRVUywgdDAKPj4+ICsJ LyoKPj4+ICsJICogSWYgcHJldmlvdXMgbW9kZSB3YXMgVSwgY2FwdHVyZSBzaGFkb3cgc3RhY2sg cG9pbnRlciBhbmQgc2F2ZSBpdCBhd2F5Cj4+PiArCSAqIFplcm8gQ1NSX1NTUCBhdCB0aGUgc2Ft ZSB0aW1lIGZvciBzYW5pdGl6YXRpb24uCj4+PiArCSAqLwo+Pj4gKwlBTFRFUk5BVElWRSgibm9w OyBub3A7IG5vcDsgbm9wIiwKPj4+ICsJCQkJX19zdHJpbmdpZnkoCQkJXAo+Pj4gKwkJCQlhbmRp IHMyLCBzMSwgU1JfU1BQOwlcCj4+PiArCQkJCWJuZXogczIsIHNraXBfc3NwX3NhdmU7CVwKPj4+ ICsJCQkJY3NycncgczIsIENTUl9TU1AsIHgwOwlcCj4+PiArCQkJCVJFR19TIHMyLCBUQVNLX1RJ X1VTRVJfU1NQKHRwKTsgXAo+Pj4gKwkJCQlza2lwX3NzcF9zYXZlOiksCj4+PiArCQkJCTAsCj4+ PiArCQkJCVJJU0NWX0lTQV9FWFRfWklDRklTUywKPj4+ICsJCQkJQ09ORklHX1JJU0NWX1VTRVJf Q0ZJKQo+Pgo+PihJJ2QgcHJlZmVyIHRoaXMgY2xvc2VyIHRvIHRoZSB1c2VyX3NwIGFuZCBrZXJu ZWxfc3Agc3dhcCwgaXQncyBicmVha2luZwo+PiB0aGUgZmxvdyBoZXJlLiAgV2UgYWxzbyBhbHJl YWR5IGtub3cgaWYgd2UndmUgcmV0dXJuZWQgZnJvbSB1c2Vyc3BhY2UKPj4gb3Igbm90IGV2ZW4g d2l0aG91dCBTUl9TUFAsIGJ1dCByZXVzaW5nIHRoZSBpbmZvcm1hdGlvbiBtaWdodCB0YW5nbGUK Pj4gdGhlIGxvZ2ljLikKPgo+IElmIENTUl9TQ1JBVENIIHdhcyAwLCB0aGVuIHdlIHdvdWxkIGJl IGNvbWluZyBmcm9tIGtlcm5lbCBlbHNlIGZsb3cgZ29lcwo+IHRvIGAuTHNhdmVfY29udGV4dGAu IElmIHdlIHdlcmUgY29taW5nIGZyb20ga2VybmVsIG1vZGUsIHRoZW4gZXZlbnR1YWxseQo+IGZs b3cgbWVyZ2VzIHRvIGAuTHNhdmVfY29udGV4dGAuCj4KPiBTbyB3ZSB3aWxsIGJlIHNhdmluZyBD U1JfU1NQIG9uIGFsbCBrZXJuZWwgLS0gPiBrZXJuZWwgdHJhcCBoYW5kbGluZy4gVGhhdAo+IHdv dWxkIGJlIHVubmVjZXNzYXJ5LiBJSVJDLCB0aGlzIHdhcyBvbmUgb2YgdGhlIGZpcnN0IHJldmll dyBjb21tZW50cyBpbgo+IGVhcmx5IFJGQyBzZXJpZXMgb2YgdGhlc2UgcGF0Y2ggc2VyaWVzICh0 byBub3QgdG91Y2ggQ1NSX1NTUCB1bi1uZWNlc3NhcmlseSkKPgo+IFdlIGNhbiBhdm9pZCB0aGF0 IGJ5IGVuc3VyaW5nIHdoZW4gd2UgYnJhbmNoIGJ5IGRldGVybWluaW5nIGlmIHdlIGFyZSBjb21p bmcKPiBmcm9tIHVzZXIgdG8gc29tZXRoaW5nIGxpa2UgYC5Mc2F2ZV9zc3BgIHdoaWNoIGV2ZW50 dWFsbHkgbWVyZ2VzIGludG8KPiAiLkxzYXZlX2NvbnRleHQiLiBBbmQgaWYgd2Ugd2VyZSBjb21p bmcgZnJvbSBrZXJuZWwgdGhlbiB3ZSB3b3VsZCBicmFuY2ggdG8KPiBgLkxzYXZlX2NvbnRleHRg IGFuZCB0aHVzIHNraXBwaW5nIHNzcCBzYXZlIGxvZ2ljLiBCdXQgIyBvZiBicmFuY2hlcyBpdAo+ IGludHJvZHVjZXMgaW4gZWFybHkgZXhjZXB0aW9uIGhhbmRsaW5nIGlzIGVxdWl2YWxlbnQgdG8g d2hhdCBjdXJyZW50IHBhdGNoZXMKPiBkby4gU28gSSBkb24ndCBzZWUgYW55IHZhbHVlIGluIGRv aW5nIHRoYXQuCj4KPiBMZXQgbWUga25vdyBpZiBJIGFtIG1pc3Npbmcgc29tZXRoaW5nLgoKUmln aHQsIGl0J3MgaGFyZCB0byBhdm9pZCB0aGUgZXh0cmEgYnJhbmNoZXMuCgpJIHRoaW5rIHdlIGNv dWxkIG1vZGlmeSB0aGUgZW50cnkgcG9pbnQgKFNUVkVDKSwgc28gd2Ugc3RhcnQgYXQKZGlmZmVy ZW50IHBhdGhzIGJhc2VkIG9uIGtlcm5lbC91c2Vyc3BhY2UgdHJhcCBhbmQgb25seSBqdW1wIG9u Y2UgdG8gdGhlCmNvbW1vbiBjb2RlLCBsaWtlOgoKICBTWU1fQ09ERV9TVEFSVChoYW5kbGVfZXhj ZXB0aW9uX2tlcm5lbCkKICAgIC8qIGtlcm5lbCBzZXR1cCBtYWdpYyAqLwogICAgaiBoYW5kbGVf ZXhjZXB0aW9uX2NvbW1vbgogIFNZTV9DT0RFX1NUQVJUKGhhbmRsZV9leGNlcHRpb25fdXNlcikK ICAgIC8qIHVzZXJzcGFjZSBzZXR1cCBtYWdpYyAqLwogIGhhbmRsZV9leGNlcHRpb25fY29tbW9u OgoKVGhpcyBpcyBub3QgYSBzdWdnZXN0aW9uIGZvciB0aGlzIHNlcmllcy4gIEkgd291bGQgYmUg cGVyZmVjdGx5IGhhcHB5CndpdGgganVzdCBhIGNsZWFuZXIgY29kZS4KCldvdWxkIGl0IGJlIHBv c3NpYmxlIHRvIGhpZGUgdGhlIEFMVEVSTkFUSVZFIHVnbGluZXNzIGJlaGluZCBhIG1hY3JvIGFu ZAptb3ZlIGl0IG91dHNpZGUgdGhlIGNvZGUgYmxvY2sgdGhhdCBzYXZlcyBwdF9yZWdzPwoKVGhh bmtzLgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGlu dXgtcmlzY3YgbWFpbGluZyBsaXN0CmxpbnV4LXJpc2N2QGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0 cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1yaXNjdgo=