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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 , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, alistair.francis@wdc.com, richard.henderson@linaro.org, jim.shu@sifive.com, andybnac@gmail.com, kito.cheng@sifive.com, charlie@rivosinc.com, atishp@rivosinc.com, evan@rivosinc.com, cleger@rivosinc.com, alexghiti@rivosinc.com, samitolvanen@google.com, broonie@kernel.org, rick.p.edgecombe@intel.com, Zong Li , linux-riscv Subject: Re: [PATCH v12 05/28] riscv: usercfi state for task and save/restore of CSR_SSP on trap entry/exit Message-ID: References: <20250314-v5_user_cfi_series-v12-0-e51202b53138@rivosinc.com> <20250314-v5_user_cfi_series-v12-5-e51202b53138@rivosinc.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250424_190405_979661_F1276A66 X-CRM114-Status: GOOD ( 21.98 ) 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-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gVGh1LCBBcHIgMjQsIDIwMjUgYXQgMDI6MTY6MzJQTSArMDIwMCwgUmFkaW0gS3LEjW3DocWZ IHdyb3RlOgo+MjAyNS0wNC0yM1QxNzoyMzo1Ni0wNzowMCwgRGVlcGFrIEd1cHRhIDxkZWJ1Z0By aXZvc2luYy5jb20+Ogo+PiBPbiBUaHUsIEFwciAxMCwgMjAyNSBhdCAwMTowNDozOVBNICswMjAw LCBSYWRpbSBLcsSNbcOhxZkgd3JvdGU6Cj4+PjIwMjUtMDMtMTRUMTQ6Mzk6MjQtMDc6MDAsIERl ZXBhayBHdXB0YSA8ZGVidWdAcml2b3NpbmMuY29tPjoKPj4+PiBkaWZmIC0tZ2l0IGEvYXJjaC9y aXNjdi9rZXJuZWwvZW50cnkuUyBiL2FyY2gvcmlzY3Yva2VybmVsL2VudHJ5LlMKPj4+PiBAQCAt MTQ3LDYgKzE0NywyMCBAQCBTWU1fQ09ERV9TVEFSVChoYW5kbGVfZXhjZXB0aW9uKQo+Pj4+Cj4+ Pj4gIAlSRUdfTCBzMCwgVEFTS19USV9VU0VSX1NQKHRwKQo+Pj4+ICAJY3NycmMgczEsIENTUl9T VEFUVVMsIHQwCj4+Pj4gKwkvKgo+Pj4+ICsJICogSWYgcHJldmlvdXMgbW9kZSB3YXMgVSwgY2Fw dHVyZSBzaGFkb3cgc3RhY2sgcG9pbnRlciBhbmQgc2F2ZSBpdCBhd2F5Cj4+Pj4gKwkgKiBaZXJv IENTUl9TU1AgYXQgdGhlIHNhbWUgdGltZSBmb3Igc2FuaXRpemF0aW9uLgo+Pj4+ICsJICovCj4+ Pj4gKwlBTFRFUk5BVElWRSgibm9wOyBub3A7IG5vcDsgbm9wIiwKPj4+PiArCQkJCV9fc3RyaW5n aWZ5KAkJCVwKPj4+PiArCQkJCWFuZGkgczIsIHMxLCBTUl9TUFA7CVwKPj4+PiArCQkJCWJuZXog czIsIHNraXBfc3NwX3NhdmU7CVwKPj4+PiArCQkJCWNzcnJ3IHMyLCBDU1JfU1NQLCB4MDsJXAo+ Pj4+ICsJCQkJUkVHX1MgczIsIFRBU0tfVElfVVNFUl9TU1AodHApOyBcCj4+Pj4gKwkJCQlza2lw X3NzcF9zYXZlOiksCj4+Pj4gKwkJCQkwLAo+Pj4+ICsJCQkJUklTQ1ZfSVNBX0VYVF9aSUNGSVNT LAo+Pj4+ICsJCQkJQ09ORklHX1JJU0NWX1VTRVJfQ0ZJKQo+Pj4KPj4+KEknZCBwcmVmZXIgdGhp cyBjbG9zZXIgdG8gdGhlIHVzZXJfc3AgYW5kIGtlcm5lbF9zcCBzd2FwLCBpdCdzIGJyZWFraW5n Cj4+PiB0aGUgZmxvdyBoZXJlLiAgV2UgYWxzbyBhbHJlYWR5IGtub3cgaWYgd2UndmUgcmV0dXJu ZWQgZnJvbSB1c2Vyc3BhY2UKPj4+IG9yIG5vdCBldmVuIHdpdGhvdXQgU1JfU1BQLCBidXQgcmV1 c2luZyB0aGUgaW5mb3JtYXRpb24gbWlnaHQgdGFuZ2xlCj4+PiB0aGUgbG9naWMuKQo+Pgo+PiBJ ZiBDU1JfU0NSQVRDSCB3YXMgMCwgdGhlbiB3ZSB3b3VsZCBiZSBjb21pbmcgZnJvbSBrZXJuZWwg ZWxzZSBmbG93IGdvZXMKPj4gdG8gYC5Mc2F2ZV9jb250ZXh0YC4gSWYgd2Ugd2VyZSBjb21pbmcg ZnJvbSBrZXJuZWwgbW9kZSwgdGhlbiBldmVudHVhbGx5Cj4+IGZsb3cgbWVyZ2VzIHRvIGAuTHNh dmVfY29udGV4dGAuCj4+Cj4+IFNvIHdlIHdpbGwgYmUgc2F2aW5nIENTUl9TU1Agb24gYWxsIGtl cm5lbCAtLSA+IGtlcm5lbCB0cmFwIGhhbmRsaW5nLiBUaGF0Cj4+IHdvdWxkIGJlIHVubmVjZXNz YXJ5LiBJSVJDLCB0aGlzIHdhcyBvbmUgb2YgdGhlIGZpcnN0IHJldmlldyBjb21tZW50cyBpbgo+ PiBlYXJseSBSRkMgc2VyaWVzIG9mIHRoZXNlIHBhdGNoIHNlcmllcyAodG8gbm90IHRvdWNoIENT Ul9TU1AgdW4tbmVjZXNzYXJpbHkpCj4+Cj4+IFdlIGNhbiBhdm9pZCB0aGF0IGJ5IGVuc3VyaW5n IHdoZW4gd2UgYnJhbmNoIGJ5IGRldGVybWluaW5nIGlmIHdlIGFyZSBjb21pbmcKPj4gZnJvbSB1 c2VyIHRvIHNvbWV0aGluZyBsaWtlIGAuTHNhdmVfc3NwYCB3aGljaCBldmVudHVhbGx5IG1lcmdl cyBpbnRvCj4+ICIuTHNhdmVfY29udGV4dCIuIEFuZCBpZiB3ZSB3ZXJlIGNvbWluZyBmcm9tIGtl cm5lbCB0aGVuIHdlIHdvdWxkIGJyYW5jaCB0bwo+PiBgLkxzYXZlX2NvbnRleHRgIGFuZCB0aHVz IHNraXBwaW5nIHNzcCBzYXZlIGxvZ2ljLiBCdXQgIyBvZiBicmFuY2hlcyBpdAo+PiBpbnRyb2R1 Y2VzIGluIGVhcmx5IGV4Y2VwdGlvbiBoYW5kbGluZyBpcyBlcXVpdmFsZW50IHRvIHdoYXQgY3Vy cmVudCBwYXRjaGVzCj4+IGRvLiBTbyBJIGRvbid0IHNlZSBhbnkgdmFsdWUgaW4gZG9pbmcgdGhh dC4KPj4KPj4gTGV0IG1lIGtub3cgaWYgSSBhbSBtaXNzaW5nIHNvbWV0aGluZy4KPgo+UmlnaHQs IGl0J3MgaGFyZCB0byBhdm9pZCB0aGUgZXh0cmEgYnJhbmNoZXMuCj4KPkkgdGhpbmsgd2UgY291 bGQgbW9kaWZ5IHRoZSBlbnRyeSBwb2ludCAoU1RWRUMpLCBzbyB3ZSBzdGFydCBhdAo+ZGlmZmVy ZW50IHBhdGhzIGJhc2VkIG9uIGtlcm5lbC91c2Vyc3BhY2UgdHJhcCBhbmQgb25seSBqdW1wIG9u Y2UgdG8gdGhlCj5jb21tb24gY29kZSwgbGlrZToKPgo+ICBTWU1fQ09ERV9TVEFSVChoYW5kbGVf ZXhjZXB0aW9uX2tlcm5lbCkKPiAgICAvKiBrZXJuZWwgc2V0dXAgbWFnaWMgKi8KPiAgICBqIGhh bmRsZV9leGNlcHRpb25fY29tbW9uCj4gIFNZTV9DT0RFX1NUQVJUKGhhbmRsZV9leGNlcHRpb25f dXNlcikKPiAgICAvKiB1c2Vyc3BhY2Ugc2V0dXAgbWFnaWMgKi8KPiAgaGFuZGxlX2V4Y2VwdGlv bl9jb21tb246CgpIbW0uLi4gVGhpcyBjYW4gYmUgZG9uZS4gQnV0IHRoZW4gaXQgd291bGQgcmVx dWlyZSB0byBjb25zdGFudGx5IG1vZGlmeSBgc3R2ZWNgCldoZW4geW91J3JlIGdvaW5nIGJhY2sg dG8gdXNlciBtb2RlLCB5b3Ugd291bGQgaGF2ZSB0byB3cml0ZSBgc3R2ZWNgIHdpdGggYWRkcgpv ZiBgaGFuZGxlX2V4Y2VwdGlvbl91c2VyYC4gQnV0IHRoZW4geW91IGNhbiBlYXNpbHkgZ2V0IGEg Tk1JLiBJdCBjYW4gYmVjb21lCnVnbHkuIE5lZWRzIG11Y2ggbW9yZSB0aG91Z2h0IGFuZCBvbiBm aXJzdCBnbGFuY2UgZmVlbHMgZXJyb3IgcHJvbmUuCgpPbmx5IGlmIHdlIGhhdmUgYW4gZXh0ZW5z aW9uIHRoYXQgYWxsb3dzIGRpZmZlcmVudCB0cmFwIGFkZHJlc3MgZGVwZW5kaW5nIG9uCm1vZGUg eW91J3JlIGNvbWluZyBmcm9tIChhcm0gZG9lcyB0aGF0LCByaWdodD8sIEkgdGhpbmsgeDg2IEZS RUQgYWxzbyBkb2VzCnRoYXQpCj4KPlRoaXMgaXMgbm90IGEgc3VnZ2VzdGlvbiBmb3IgdGhpcyBz ZXJpZXMuICBJIHdvdWxkIGJlIHBlcmZlY3RseSBoYXBweQo+d2l0aCBqdXN0IGEgY2xlYW5lciBj b2RlLgo+Cj5Xb3VsZCBpdCBiZSBwb3NzaWJsZSB0byBoaWRlIHRoZSBBTFRFUk5BVElWRSB1Z2xp bmVzcyBiZWhpbmQgYSBtYWNybyBhbmQKPm1vdmUgaXQgb3V0c2lkZSB0aGUgY29kZSBibG9jayB0 aGF0IHNhdmVzIHB0X3JlZ3M/CgpTdXJlLCBJJ2xsIGRvIHNvbWV0aGluZyBhYm91dCBpdC4KCj4K PlRoYW5rcy4KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f CmxpbnV4LXJpc2N2IG1haWxpbmcgbGlzdApsaW51eC1yaXNjdkBsaXN0cy5pbmZyYWRlYWQub3Jn Cmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtcmlzY3YK