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Received: from localhost.localdomain(mailfrom:fangyu.yu@linux.alibaba.com fp:SMTPD_---0XBErlvu_1789873979 cluster:ay36) by smtp.aliyun-inc.com; Sun, 20 Sep 2026 11:13:01 +0800 From: fangyu.yu@linux.alibaba.com To: gsh517025@gmail.com Cc: alex@ghiti.fr, andrew.jones@oss.qualcomm.com, anup@brainfault.org, aou@eecs.berkeley.edu, atish.patra@linux.dev, baolu.lu@linux.intel.com, fangyu.yu@linux.alibaba.com, gong.shuai@sanechips.com.cn, guoren@kernel.org, iommu@lists.linux.dev, jgg@nvidia.com, jgg@ziepe.ca, joerg.roedel@amd.com, joro@8bytes.org, jroedel@suse.de, kevin.tian@intel.com, kvm-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, palmer@dabbelt.com, pjw@kernel.org, robin.murphy@arm.com, skhawaja@google.com, tomasz.jeznach@linux.dev, vasant.hegde@amd.com, will@kernel.org, zong.li@sifive.com Subject: Re: [RFC PATCH v4 08/10] iommu/riscv: Pre-enable GADE for second-stage domains Date: Sun, 20 Sep 2026 11:12:59 +0800 Message-Id: <20260920031259.20950-1-fangyu.yu@linux.alibaba.com> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <90826872-1374-49e4-832d-555abf8e8369@gmail.com> References: <90826872-1374-49e4-832d-555abf8e8369@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260919_201308_010756_012BA7CA X-CRM114-Status: GOOD ( 18.66 ) 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 PkhpIEZhbmd5dSwKPgo+T24gOS8xNS8yMDI2IDExOjI4IEFNLCBmYW5neXUueXVAbGludXguYWxp YmFiYS5jb20gd3JvdGU6Cj4+IEZyb206IEZhbmd5dSBZdSA8ZmFuZ3l1Lnl1QGxpbnV4LmFsaWJh YmEuY29tPgo+Pgo+PiBQcmUtZW5hYmxlIFJJU0NWX0lPTU1VX0RDX1RDX0dBREUgaW4gdGhlIGRl dmljZSBjb250ZXh0IHdoZW4KPj4gYXR0YWNoaW5nIGEgc2Vjb25kLXN0YWdlIGRvbWFpbiwgaWYg dGhlIElPTU1VIHN1cHBvcnRzIEFNT19IV0FELgo+Pgo+PiBTb2Z0d2FyZSBwcmUtcG9wdWxhdGVz IHNlY29uZC1zdGFnZSBwYWdlIHRhYmxlcyB3aXRoIEQgc2V0LCBzbwo+PiBlbmFibGluZyBHQURF IGJ5IGRlZmF1bHQgZG9lcyBub3QgY2hhbmdlIG5vcm1hbCBiZWhhdmlvci4gV2hlbgo+PiBkaXJ0 eSB0cmFja2luZyBpcyBlbmFibGVkLCBpb21tdWZkIGNsZWFycyB0aGUgcHJlLXNldCBEIGJpdHMg YW5kCj4+IEdBREUgYmVjb21lcyBuZWNlc3NhcnkgZm9yIGhhcmR3YXJlIHRvIHVwZGF0ZSB0aGUg ZGlydHkgYml0IG9uCj4+IHdyaXRlIGFjY2Vzcy4KPj4KPj4gVGhpcyBhdm9pZHMgdG9nZ2xpbmcg R0FERSBkeW5hbWljYWxseSBhbmQga2VlcHMgZGV2aWNlIGNvbnRleHQKPj4gc2V0dXAgY29uc2lz dGVudCB3aXRoIHNlY29uZC1zdGFnZSBkb21haW4gYXR0YWNobWVudC4KPj4KPj4gU2lnbmVkLW9m Zi1ieTogRmFuZ3l1IFl1IDxmYW5neXUueXVAbGludXguYWxpYmFiYS5jb20+Cj4+IC0tLQo+PiAg IGRyaXZlcnMvaW9tbXUvcmlzY3YvaW9tbXUuYyB8IDIgKysKPj4gICAxIGZpbGUgY2hhbmdlZCwg MiBpbnNlcnRpb25zKCspCj4+Cj4+IGRpZmYgLS1naXQgYS9kcml2ZXJzL2lvbW11L3Jpc2N2L2lv bW11LmMgYi9kcml2ZXJzL2lvbW11L3Jpc2N2L2lvbW11LmMKPj4gaW5kZXggMTY3Nzk4NzczNTFi Li5mMDFmZDRlMmY4NDAgMTAwNjQ0Cj4+IC0tLSBhL2RyaXZlcnMvaW9tbXUvcmlzY3YvaW9tbXUu Ywo+PiArKysgYi9kcml2ZXJzL2lvbW11L3Jpc2N2L2lvbW11LmMKPj4gQEAgLTEzMzAsNiArMTMz MCw4IEBAIHN0YXRpYyBpbnQgcmlzY3ZfaW9tbXVfYXR0YWNoX3BhZ2luZ19kb21haW4oc3RydWN0 IGlvbW11X2RvbWFpbiAqaW9tbXVfZG9tYWluLAo+PiAgIAkJCUZJRUxEX1BSRVAoUklTQ1ZfSU9N TVVfRENfSU9IR0FUUF9NT0RFLCBwdF9pbmZvLmlvaGdhdHBfbW9kZSkgfAo+PiAgIAkJCUZJRUxE X1BSRVAoUklTQ1ZfSU9NTVVfRENfSU9IR0FUUF9HU0NJRCwgZG9tYWluLT5nc2NpZCkgfAo+PiAg IAkJCUZJRUxEX1BSRVAoUklTQ1ZfSU9NTVVfRENfSU9IR0FUUF9QUE4sIHB0X2luZm8ucHBuKTsK Pj4gKwkJaWYgKGlvbW11LT5jYXBzICYgUklTQ1ZfSU9NTVVfQ0FQQUJJTElUSUVTX0FNT19IV0FE KQo+PiArCQkJZGMudGMgfD0gUklTQ1ZfSU9NTVVfRENfVENfR0FERTsKCkhpIFNodWFpOgoKPgo+ SSBtaWdodCBiZSBtaXNzaW5nIHNvbWV0aGluZywgYnV0IEkgZG9uJ3Qgc2VlIGhvdyB0aGUgR0FE RSBiaXQgc2V0Cj5oZXJlIHJlYWNoZXMgdGhlIGhhcmR3YXJlIElPTU1VIERDLiBJbiByaXNjdl9p b21tdV9pb2Rpcl91cGRhdGUoKQo+KGluIHBhdGNoIDA0LzEwKSwgaXQgbG9va3MgbGlrZSBvbmx5 IHRoZSBWIGJpdCBpcyB0YWtlbjoKPgo+CXRjID0gUkVBRF9PTkNFKGRjLT50Yyk7Cj4JdGMgfD0g bmV3X2RjLT50YSAmIFJJU0NWX0lPTU1VX0RDX1RDX1Y7Cj4JLi4uCj4JV1JJVEVfT05DRShkYy0+ dGMsIHRjKTsKPgoKWW914oCZcmUgcmlnaHQg4oCUIHRoaXMgaXMgYSByZWFsIGlzc3VlLgoKR0FE RSB3YXMgYmVpbmcgc2V0IGluIHRoZSBzb2Z0d2FyZS1zaWRlIGRjLCBidXQgaXQgd2FzIG5vdApw cm9wYWdhdGVkIGludG8gdGhlIGhhcmR3YXJlIERDIGluIHJpc2N2X2lvbW11X2lvZGlyX3VwZGF0 ZSgpLgoKSSBoYXZlIGFscmVhZHkgZml4ZWQgdGhpcyBpbiBteSBsb2NhbCB0cmVlLCBhbmQgSeKA mWxsIGluY2x1ZGUgdGhlCmNoYW5nZSBpbiB0aGUgbmV4dCB2ZXJzaW9uIG9mIHRoZSBwYXRjaHNl dDoKICAgIHRjICY9IH5SSVNDVl9JT01NVV9EQ19UQ19HQURFOwogICAgdGMgfD0gbmV3X2RjLT50 YyAmIFJJU0NWX0lPTU1VX0RDX1RDX0dBREU7CiAgICB0YyB8PSBuZXdfZGMtPnRhICYgUklTQ1Zf SU9NTVVfRENfVENfVjsKCj5JIHNhdyB0aGF0IHlvdSBtZW50aW9uZWQgeW91IHRlc3RlZCBpdCBv biBRRU1VLiBBcyBmYXIgYXMgSSBrbm93LAo+bWFpbmxpbmUgUUVNVSBoYXMgbm90IHlldCBkZWNs YXJlZCB0aGUgQU1PX0hXQUQgY2FwYWJpbGl0eS4gQ291bGQKPnlvdSBjbGFyaWZ5IHdoZXRoZXIg eW91IHVzZWQgYSBtb2RpZmllZCBRRU1VIGZvciB0aGlzIHRlc3Q/Cj4KCkkgdXNlZCBtYWlubGlu ZSBRRU1VLCBub3QgYSBtb2RpZmllZCBvbmUuCgpJbiBRRU1VLCBJIG9ubHkgdGVzdGVkIHRoZSBz ZWNvbmQtc3RhZ2UgcGF0aCB3aXRoIGEKVk0gdXNpbmcgZGV2aWNlIHBhc3N0aHJvdWdoLgoKSSBk aWQgbm90IHRlc3QgdGhlIGRpcnR5LWxvZyByZWxhdGVkIHBhcnQgdGhlcmUsCnNvIHRoYXQgcGF0 aCBjYW5ub3QgYmUgY292ZXJlZCB0aGVyZS4KClRoYXQgaXMgd2h5IEkgbm90ZWQgaW4gdGhlIFRP RE8gdGhhdCBJIHdpbGwgYnVpbGQgYQpkZWRpY2F0ZWQgdGVzdCBjYXNlIGZvciBkaXJ0eSBsb2cg aGFuZGxpbmcgbGF0ZXIuCgpUaGFua3MsCkZhbmd5dQoKPlRoYW5rcywKPlNodWFpCj4KPj4gICAJ fSBlbHNlIHsKPj4gICAJCWlmICghcmlzY3ZfaW9tbXVfZnNjX3N1cHBvcnRlZChpb21tdSwgcHRf aW5mby5mc2NfaW9zYXRwX21vZGUpKQo+PiAgIAkJCXJldHVybiAtRU5PREVWOwoKX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtcmlzY3YgbWFpbGlu ZyBsaXN0CmxpbnV4LXJpc2N2QGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJh ZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1yaXNjdgo=