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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49230a58fddsm233967025e9.8.2026.06.18.06.36.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Jun 2026 06:36:37 -0700 (PDT) Date: Thu, 18 Jun 2026 14:36:34 +0100 From: David Laight To: Guo Ren Cc: Vivian Wang , zhangzhanpeng.jasper@bytedance.com, alex@ghiti.fr, aou@eecs.berkeley.edu, cuiyunhui@bytedance.com, iommu@lists.linux.dev, joro@8bytes.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, luxu.kernel@bytedance.com, palmer@dabbelt.com, pjw@kernel.org, robin.murphy@arm.com, tjeznach@rivosinc.com, will@kernel.org, yuanzhu@bytedance.com Subject: Re: [PATCH v1] iommu/riscv: Support 32-bit register accesses Message-ID: <20260618143634.7f3dd6c5@pumpkin> In-Reply-To: References: <20260615064855.90316-1-zhangzhanpeng.jasper@bytedance.com> <20260615123821.373248-1-guoren@kernel.org> <7c490aeb-a3d9-4fe9-81de-f9662577851d@iscas.ac.cn> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260618_063640_177708_D2692D2E X-CRM114-Status: GOOD ( 11.69 ) 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 T24gVGh1LCAxOCBKdW4gMjAyNiAxNzo1MTozNCArMDgwMApHdW8gUmVuIDxndW9yZW5Aa2VybmVs Lm9yZz4gd3JvdGU6Cgo+IEhpIFZpdmlhbiwKPiAKPiBBcyBub3RlZCBpbiB0aGUgUklTQy1WIElP TU1VIFNwZWNpZmljYXRpb24sIENoYXB0ZXIgNjoKPiA+IFdoZXRoZXIgYW4gOC1ieXRlIGFjY2Vz cyB0byBhbiBJT01NVSByZWdpc3RlciBpcyBzaW5nbGUtY29weSBhdG9taWMgaXMgVU5TUEVDSUZJ RUQsIGFuZCBzdWNoIGFuIGFjY2VzcyBtYXkgYXBwZWFyLCBpbnRlcm5hbGx5IHRvIHRoZSBJT01N VSwgYXMgaWYgdHdvIHNlcGFyYXRlIDQtYnl0ZSBhY2Nlc3NlcyDigJQgZmlyc3QgdG8gdGhlIGhp Z2ggaGFsZiBhbmQgc2Vjb25kIHRvIHRoZSBsb3cgaGFsZiDigJQgd2VyZSBwZXJmb3JtZWQuICAK PiAKPiBUaGVyZWZvcmUsIHRoZSBhdG9taWNpdHkgb2YgNjQtYml0IE1NSU8gYWNjZXNzZXMgaXMg VU5TUEVDSUZJRUQgYW5kCj4gbm90IGNsZWFybHkgZGVmaW5lZCBpbiB0aGUgY3VycmVudCByYXRp ZmllZCBSSVNDLVYgSU9NTVUKPiBzcGVjaWZpY2F0aW9uLiBUbyBoYW5kbGUgdGhpcyBjb3JyZWN0 bHksIHRoZSBMaW51eCBSSVNDLVYgSU9NTVUgZHJpdmVyCj4gc2hvdWxkIGZhbGwgYmFjayB0byAz Mi1iaXQgTU1JTyBhY2Nlc3NlcyB3aGVuIHJlYWRpbmcgNjQtYml0IHJlZ2lzdGVycwo+IChlLmcu LCBwZXJmb3JtYW5jZSBjb3VudGVycykuIFRoZSBiZWhhdmlvciBvZiAzMi1iaXQgTU1JTyBhY2Nl c3NlcyBpcwo+IG1vcmUgcHJlY2lzZWx5IGRlZmluZWQgaW4gdGhlIFJJU0MtViBJT01NVSBzcGVj aWZpY2F0aW9uLgo+IAo+IFRodXMsIG1hbnkgaGFyZHdhcmUgdmVuZG9ycyBpbXBsZW1lbnQgMzIt Yml0IE1NSU8gKHJhdGhlciB0aGFuIDY0LWJpdAo+IE1NSU8pIGJhc2VkIG9uIHRoZSBjdXJyZW50 IHJhdGlmaWVkIFJJU0MtViBJT01NVSBzcGVjaWZpY2F0aW9uLCBhbmQKPiB0aGlzIGRyaXZlciBk b2VzIG5vdCBhcHBlYXIgdG8gYmVuZWZpdCBmcm9tIDY0LWJpdCBNTUlPIGFjY2VzcyBlaXRoZXIu Cj4gUGVyZm9ybWFuY2UgaXMgZnVuZGFtZW50YWxseSBjb25zdHJhaW5lZCBieSBidXMgbGF0ZW5j eTsgYXNzdW1pbmcgdGhhdAo+IHNpbXBseSByZWR1Y2luZyB0aGUgbnVtYmVyIG9mIGFjY2Vzc2Vz IHdpbGwgaW1wcm92ZSBwZXJmb3JtYW5jZSBpcyBhbgo+IG92ZXJzaW1wbGlmaWNhdGlvbiB0aGF0 IGlnbm9yZXMgdGhlIHVuZGVybHlpbmcgaGFyZHdhcmUKPiBjaGFyYWN0ZXJpc3RpY3MuCgpJZiB0 aGUgYnVzIGxhdGVuY3kgaXMgc2lnbmlmaWNhbnQgaXQgaXMgYWxtb3N0IGNlcnRhaW5seSB3b3J0 aCB1c2luZwptZW1vcnkgYWNjZXNzZXMgdG8gYXZvaWQgcmUtcmVhZGluZyB0aGUgaGkgcmVnaXN0 ZXIuCgpTb21ldGhpbmcgbGlrZSB0aGlzIG1pZ2h0IHdvcms6CgpzdGF0aWMgdm9sYXRpbGUgdTMy IGhpX3ByZXYsIGxvX3ByZXY7CgoJdTMyIGhpID0gcmVhZF9yZWdfaGkoKTsKCXUzMiBsbyA9IHJl YWRfcmVnX2xvKCk7CgoJaWYgKGxvIDw9IGxvX3ByZXYgfHwgaGkgIT0gaGlfcHJldikgewoJCXUz MiBoaV90bXAgPSByZWFkX3JlZ19oaTsKCQlpZiAoaGlfdG1wICE9IGhpKSB7CgkJCWhpID0gaGlf dG1wOwoJCQlsbyA9IDA7CgkJfQoJCWxvX3ByZXYgPSB+MHU7CgkJaGlfcHJldiA9IGhpOwoJfQoJ bG9fcHJldiA9IGxvOwoJcmV0dXJuICh1NjQpaGkgPDwgMzIgfCBsbzsKCkl0IHNob3VsZG4ndCBu ZWVkIGFueSBsb2NraW5nIGJ1dCB0aGUgYWNjZXNzZXMgZG8gbmVlZCB0byBiZSBvcmRlcmVkLgoK CURhdmlkCgoKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f CmxpbnV4LXJpc2N2IG1haWxpbmcgbGlzdApsaW51eC1yaXNjdkBsaXN0cy5pbmZyYWRlYWQub3Jn Cmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtcmlzY3YK