From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4732CC44501 for ; Tue, 14 Jul 2026 07:11:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To:Subject: MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Alied9mwLbQpBWSvp3pnA9aHBXD5ZOsOwgqqmhyzAFg=; b=4xBv4TVhtkGYKZ 3dlVRKQcM0Q1EnsZA6Nw5BUJ00UUOGjW4dsXZlKyJjz8jYb7cLdB4FFiLUYfivJUv/N4Z++f2Q0rE bH+N0asMbxcU68v3xXZZkSbIQDH0mTxLErHpm7e6AyL3sgqV73UoBdxDuaPrjl17NZXb57zFfuitT ahDrFCQYV/8+RNOoMXRUaZG+Itq1mtlm6A4L2jllk5nnUlydn1OqFLhvC6BIYcJK7MNMSyZN2FEwH /pWzQOznZ+XtuEvioPCzcGeJjysZrYEm++ZpEck0jedtG4hr7berXGHk4qkZqg0jlxd2A3Xnr6FFs BnnwajBguqfdCLBxxz2g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wjXID-0000000B806-1pVR; Tue, 14 Jul 2026 07:11:01 +0000 Received: from out-188.mta0.migadu.com ([91.218.175.188]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wjXI9-0000000B7zV-3oRb for linux-riscv@lists.infradead.org; Tue, 14 Jul 2026 07:11:00 +0000 Message-ID: <2226176d-73fd-4def-b80e-89f03bade03e@linux.dev> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1784013051; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GT3rIxG28NqGYqoctwKe35C7wW+IlZnhyXvJ39odNJY=; b=PupI7Qp0/erKaMYoqQzSiSrA843/pulTK0kaFAOKUS+a12uVrEhK1PHaNfL43H+b557ENd zAFzpBcvFbrWlokT1FABUJkn9qNNx2VMSsrNdM3mHB165AbKOPFft1SKpCTuoHbJjvKhgr eINoMgzjbQbGJ02gSPeRjhB+5R6dHho= Date: Tue, 14 Jul 2026 09:10:28 +0200 MIME-Version: 1.0 Subject: Re: [PATCH v3] iommu/riscv: Use 32-bit MMIO accesses for 64-bit registers To: Guo Ren , Zhanpeng Zhang Cc: Joerg Roedel , Will Deacon , Robin Murphy , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , David Laight , Vivian Wang , Zong Li , cuiyunhui@bytedance.com, yuanzhu@bytedance.com, iommu@lists.linux.dev, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org References: <20260615064855.90316-1-zhangzhanpeng.jasper@bytedance.com> <20260713122903.9458-1-zhangzhanpeng.jasper@bytedance.com> Content-Language: en-US X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Tomasz Jeznach In-Reply-To: X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260714_001058_810535_246BA754 X-CRM114-Status: GOOD ( 16.13 ) 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 T24gNy8xMy8yNiA3OjAyIFBNLCBHdW8gUmVuIHdyb3RlOgo+IExHVE0hCj4KPiBSZXZpZXdlZC1i eTogR3VvIFJlbiAoQWxpYmFiYSBEQU1PIEFjYWRlbXkpIDxndW9yZW5Aa2VybmVsLm9yZz4KPiBD by1kZXZlbG9wZWQtYnk6IEd1byBSZW4gKEFsaWJhYmEgREFNTyBBY2FkZW15KSA8Z3VvcmVuQGtl cm5lbC5vcmc+Cj4gU2lnbmVkLW9mZi1ieTogR3VvIFJlbiAoQWxpYmFiYSBEQU1PIEFjYWRlbXkp IDxndW9yZW5Aa2VybmVsLm9yZz4KPgo+IE9uIE1vbiwgSnVsIDEzLCAyMDI2IGF0IDg6MjnigK9Q TSBaaGFucGVuZyBaaGFuZwo+IDx6aGFuZ3poYW5wZW5nLmphc3BlckBieXRlZGFuY2UuY29tPiB3 cm90ZToKPj4gVGhlIFJJU0MtViBJT01NVSBzcGVjaWZpY2F0aW9uIFsxXSBwZXJtaXRzIDY0LWJp dCByZWdpc3RlcnMgdG8gYmUgYWNjZXNzZWQKPj4gdXNpbmcgdHdvIDMyLWJpdCB0cmFuc2FjdGlv bnMsIGhpZ2ggaGFsZiBmaXJzdCwgYW5kIGxlYXZlcyB0aGUgc2luZ2xlLWNvcHkKPj4gYXRvbWlj aXR5IG9mIDgtYnl0ZSBJT01NVSByZWdpc3RlciBhY2Nlc3NlcyB1bnNwZWNpZmllZC4KPj4KPj4g VXNlIHRoZSBnZW5lcmljIGhpX2xvX3JlYWRxX3JlbGF4ZWQoKSBhbmQgaGlfbG9fd3JpdGVxX3Jl bGF4ZWQoKSBoZWxwZXJzCj4+IGZvciBvcmRpbmFyeSA2NC1iaXQgSU9NTVUgcmVnaXN0ZXJzLiBG b3IgRERUUCwgcG9sbCBCVVNZIGluIHRoZSBsb3cgaGFsZiwKPj4gdGhlbiByZWFkIHRoZSBoaWdo IGhhbGYgYW5kIGNvbXBvc2UgdGhlIHJlZ2lzdGVyIHZhbHVlIGZyb20gdGhlIHBvbGxlZCBsb3cK Pj4gaGFsZi4gSFBNIGNvdW50ZXIgcmVhZHMgcmVxdWlyZSBhIHJvbGxvdmVyLWF3YXJlIHNlcXVl bmNlIGFuZCByZW1haW4KPj4gb3V0c2lkZSB0aGVzZSBhY2Nlc3NvcnMuCj4+Cj4+IFRoaXMgZm9s bG93cyB0aGUgMzItYml0IGFjY2VzcyBkaXJlY3Rpb24gcHJvcG9zZWQgYnkgR3VvIFJlbiBbMl0g YW5kIHVzZXMKPj4gdGhlIGdlbmVyaWMgbm9uLWF0b21pYyBNTUlPIGhlbHBlcnMgc3VnZ2VzdGVk IGJ5IERhdmlkIExhaWdodC4KPj4KPj4gWzFdIGh0dHBzOi8vZG9jcy5yaXNjdi5vcmcvcmVmZXJl bmNlL2lvbW11Lwo+PiBbMl0gaHR0cHM6Ly9sb3JlLmtlcm5lbC5vcmcvci8yMDI1MDkwMzE0NDIx Ny44Mzc0NDgtMS1ndW9yZW5Aa2VybmVsLm9yZwo+Pgo+PiBTdWdnZXN0ZWQtYnk6IEd1byBSZW4g PGd1b3JlbkBrZXJuZWwub3JnPgo+PiBTdWdnZXN0ZWQtYnk6IERhdmlkIExhaWdodCA8ZGF2aWQu bGFpZ2h0LmxpbnV4QGdtYWlsLmNvbT4KPj4gU2lnbmVkLW9mZi1ieTogWmhhbnBlbmcgWmhhbmcg PHpoYW5nemhhbnBlbmcuamFzcGVyQGJ5dGVkYW5jZS5jb20+Cj4+IC0tLQo+PiBDaGFuZ2VzIGlu IHYzOgo+PiAtIFVzZSB0aGUgRERUUCBhY2Nlc3Mgc2VxdWVuY2UgZnJvbSBbMV06IHJldGFpbiB0 aGUgbG93IGhhbGYgcmV0dXJuZWQgYnkKPj4gICAgQlVTWSBwb2xsaW5nLCByZWFkIG9ubHkgdGhl IGhpZ2ggaGFsZiwgYW5kIGNvbXBvc2UgdGhlIEREVFAgdmFsdWUgZnJvbQo+PiAgICB0aG9zZSB0 d28gMzItYml0IHJlYWRzLgo+Pgo+PiBDaGFuZ2VzIGluIHYyOgo+PiAtIFJld29yayB0aGUgcGF0 Y2ggYmFzZWQgb24gR3VvIFJlbidzIGVhcmxpZXIgcHJvcG9zYWwgWzFdLgo+PiAtIERyb3AgdGhl IGJ1aWxkLXRpbWUgb3B0aW9uIGFuZCB1c2UgMzItYml0IGFjY2Vzc2VzIHVuY29uZGl0aW9uYWxs eS4KPj4gLSBEcm9wIHRoZSBnbG9iYWwgbG9jayBhbmQgdXNlIHRoZSBnZW5lcmljIGhpZ2gtbG93 IE1NSU8gaGVscGVycywgYXMKPj4gICAgc3VnZ2VzdGVkIGJ5IERhdmlkIExhaWdodC4KPj4gLSBQ b2xsIEREVFAuQlVTWSB0aHJvdWdoIGl0cyBsb3cgaGFsZi4KPj4KPj4gTGluayB0byB2MTogWzJd Cj4+IFNwZWNpZmljYXRpb24gZGlzY3Vzc2lvbjogWzNdCj4+Cj4+IFsxXTogaHR0cHM6Ly9sb3Jl Lmtlcm5lbC5vcmcvci8yMDI1MDkwMzE0NDIxNy44Mzc0NDgtMS1ndW9yZW5Aa2VybmVsLm9yZwo+ PiBbMl06IGh0dHBzOi8vbG9yZS5rZXJuZWwub3JnL3IvMjAyNjA2MTUwNjQ4NTUuOTAzMTYtMS16 aGFuZ3poYW5wZW5nLmphc3BlckBieXRlZGFuY2UuY29tCj4+IFszXTogaHR0cHM6Ly9naXRodWIu Y29tL3Jpc2N2LW5vbi1pc2EvcmlzY3YtaW9tbXUvaXNzdWVzLzc2NQo+Pgo+PiAgIGRyaXZlcnMv aW9tbXUvcmlzY3YvaW9tbXUuYyB8IDkgKysrKysrLS0tCj4+ICAgZHJpdmVycy9pb21tdS9yaXNj di9pb21tdS5oIHwgOSArKystLS0tLS0KPj4gICAyIGZpbGVzIGNoYW5nZWQsIDkgaW5zZXJ0aW9u cygrKSwgOSBkZWxldGlvbnMoLSkKPj4KPj4gZGlmZiAtLWdpdCBhL2RyaXZlcnMvaW9tbXUvcmlz Y3YvaW9tbXUuYyBiL2RyaXZlcnMvaW9tbXUvcmlzY3YvaW9tbXUuYwo+PiBpbmRleCBjZWMzZGRk N2FiMS4uZDY0N2I3MWViZWMgMTAwNjQ0Cj4+IC0tLSBhL2RyaXZlcnMvaW9tbXUvcmlzY3YvaW9t bXUuYwo+PiArKysgYi9kcml2ZXJzL2lvbW11L3Jpc2N2L2lvbW11LmMKPj4gQEAgLTY3MCw5ICs2 NzAsMTIgQEAgdm9pZCByaXNjdl9pb21tdV9kaXNhYmxlKHN0cnVjdCByaXNjdl9pb21tdV9kZXZp Y2UgKmlvbW11KQo+Pgo+PiAgICNkZWZpbmUgcmlzY3ZfaW9tbXVfcmVhZF9kZHRwKGlvbW11KSAo eyBcCj4+ICAgICAgICAgIHU2NCBkZHRwOyBcCj4+IC0gICAgICAgcmlzY3ZfaW9tbXVfcmVhZHFf dGltZW91dCgoaW9tbXUpLCBSSVNDVl9JT01NVV9SRUdfRERUUCwgZGR0cCwgXAo+PiAtICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgIShkZHRwICYgUklTQ1ZfSU9NTVVfRERUUF9CVVNZ KSwgMTAsIFwKPj4gKyAgICAgICB1MzIgZGR0cF9sbywgZGR0cF9oaTsgXAo+PiArICAgICAgIHJp c2N2X2lvbW11X3JlYWRsX3RpbWVvdXQoKGlvbW11KSwgUklTQ1ZfSU9NTVVfUkVHX0REVFAsIGRk dHBfbG8sIFwKPj4gKyAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICEoZGR0cF9sbyAm IFJJU0NWX0lPTU1VX0REVFBfQlVTWSksIDEwLCBcCj4+ICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgUklTQ1ZfSU9NTVVfRERUUF9USU1FT1VUKTsgXAo+PiArICAgICAgIGRkdHBf aGkgPSByaXNjdl9pb21tdV9yZWFkbCgoaW9tbXUpLCBSSVNDVl9JT01NVV9SRUdfRERUUCArIDQp OyBcCj4+ICsgICAgICAgZGR0cCA9ICgodTY0KWRkdHBfaGkgPDwgMzIpIHwgZGR0cF9sbzsgXAo+ PiAgICAgICAgICBkZHRwOyB9KQo+Pgo+PiAgIHN0YXRpYyBpbnQgcmlzY3ZfaW9tbXVfaW9kaXJf YWxsb2Moc3RydWN0IHJpc2N2X2lvbW11X2RldmljZSAqaW9tbXUpCj4+IEBAIC0xNTAxLDcgKzE1 MDQsNyBAQCBzdGF0aWMgaW50IHJpc2N2X2lvbW11X2luaXRfY2hlY2soc3RydWN0IHJpc2N2X2lv bW11X2RldmljZSAqaW9tbXUpCj4+ICAgICAgICAgICAqIHJlZ3VsYXIgYm9vdCBmbG93IGFuZCBk aXNhYmxlIHRyYW5zbGF0aW9uIHdoZW4gd2UgYm9vdCBpbnRvIGEga2V4ZWMKPj4gICAgICAgICAg ICoga2VybmVsIGFuZCB0aGUgcHJldmlvdXMga2VybmVsIGxlZnQgdGhlbSBlbmFibGVkLgo+PiAg ICAgICAgICAgKi8KPj4gLSAgICAgICBkZHRwID0gcmlzY3ZfaW9tbXVfcmVhZHEoaW9tbXUsIFJJ U0NWX0lPTU1VX1JFR19ERFRQKTsKPj4gKyAgICAgICBkZHRwID0gcmlzY3ZfaW9tbXVfcmVhZF9k ZHRwKGlvbW11KTsKPj4gICAgICAgICAgaWYgKGRkdHAgJiBSSVNDVl9JT01NVV9ERFRQX0JVU1kp Cj4+ICAgICAgICAgICAgICAgICAgcmV0dXJuIC1FQlVTWTsKPj4KPj4gZGlmZiAtLWdpdCBhL2Ry aXZlcnMvaW9tbXUvcmlzY3YvaW9tbXUuaCBiL2RyaXZlcnMvaW9tbXUvcmlzY3YvaW9tbXUuaAo+ PiBpbmRleCA0NmRmNzlkZDU0OS4uMWIwMzc5MGZiZTEgMTAwNjQ0Cj4+IC0tLSBhL2RyaXZlcnMv aW9tbXUvcmlzY3YvaW9tbXUuaAo+PiArKysgYi9kcml2ZXJzL2lvbW11L3Jpc2N2L2lvbW11LmgK Pj4gQEAgLTExLDYgKzExLDcgQEAKPj4gICAjaWZuZGVmIF9SSVNDVl9JT01NVV9IXwo+PiAgICNk ZWZpbmUgX1JJU0NWX0lPTU1VX0hfCj4+Cj4+ICsjaW5jbHVkZSA8bGludXgvaW8tNjQtbm9uYXRv bWljLWhpLWxvLmg+Cj4+ICAgI2luY2x1ZGUgPGxpbnV4L2lvbW11Lmg+Cj4+ICAgI2luY2x1ZGUg PGxpbnV4L3R5cGVzLmg+Cj4+ICAgI2luY2x1ZGUgPGxpbnV4L2lvcG9sbC5oPgo+PiBAQCAtNzAs MTcgKzcxLDEzIEBAIHZvaWQgcmlzY3ZfaW9tbXVfZGlzYWJsZShzdHJ1Y3QgcmlzY3ZfaW9tbXVf ZGV2aWNlICppb21tdSk7Cj4+ICAgICAgICAgIHJlYWRsX3JlbGF4ZWQoKGlvbW11KS0+cmVnICsg KGFkZHIpKQo+Pgo+PiAgICNkZWZpbmUgcmlzY3ZfaW9tbXVfcmVhZHEoaW9tbXUsIGFkZHIpIFwK Pj4gLSAgICAgICByZWFkcV9yZWxheGVkKChpb21tdSktPnJlZyArIChhZGRyKSkKPj4gKyAgICAg ICBoaV9sb19yZWFkcV9yZWxheGVkKChpb21tdSktPnJlZyArIChhZGRyKSkKPj4KPj4gICAjZGVm aW5lIHJpc2N2X2lvbW11X3dyaXRlbChpb21tdSwgYWRkciwgdmFsKSBcCj4+ICAgICAgICAgIHdy aXRlbF9yZWxheGVkKCh2YWwpLCAoaW9tbXUpLT5yZWcgKyAoYWRkcikpCj4+Cj4+ICAgI2RlZmlu ZSByaXNjdl9pb21tdV93cml0ZXEoaW9tbXUsIGFkZHIsIHZhbCkgXAo+PiAtICAgICAgIHdyaXRl cV9yZWxheGVkKCh2YWwpLCAoaW9tbXUpLT5yZWcgKyAoYWRkcikpCj4+IC0KPj4gLSNkZWZpbmUg cmlzY3ZfaW9tbXVfcmVhZHFfdGltZW91dChpb21tdSwgYWRkciwgdmFsLCBjb25kLCBkZWxheV91 cywgdGltZW91dF91cykgXAo+PiAtICAgICAgIHJlYWR4X3BvbGxfdGltZW91dChyZWFkcV9yZWxh eGVkLCAoaW9tbXUpLT5yZWcgKyAoYWRkciksIHZhbCwgY29uZCwgXAo+PiAtICAgICAgICAgICAg ICAgICAgICAgICAgICBkZWxheV91cywgdGltZW91dF91cykKPj4gKyAgICAgICBoaV9sb193cml0 ZXFfcmVsYXhlZCgodmFsKSwgKGlvbW11KS0+cmVnICsgKGFkZHIpKQo+Pgo+PiAgICNkZWZpbmUg cmlzY3ZfaW9tbXVfcmVhZGxfdGltZW91dChpb21tdSwgYWRkciwgdmFsLCBjb25kLCBkZWxheV91 cywgdGltZW91dF91cykgXAo+PiAgICAgICAgICByZWFkeF9wb2xsX3RpbWVvdXQocmVhZGxfcmVs YXhlZCwgKGlvbW11KS0+cmVnICsgKGFkZHIpLCB2YWwsIGNvbmQsIFwKPj4gLS0KPj4gMi41MC4x IChBcHBsZSBHaXQtMTU1KQoKVGhhbmsgeW91IGZvciB0aGlzIGNoYW5nZS4gU29ycnkgZm9yIGJl aW5nIGxhdGUgb24gdGhlIGRpc2N1c3Npb24uIExHVE0KClJldmlld2VkLWJ5OiBUb21hc3ogSmV6 bmFjaCA8dG9tYXN6Lmplem5hY2hAbGludXguZGV2PgoKQmVzdCwKLSBUb21hc3oKCgoKX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtcmlzY3YgbWFp bGluZyBsaXN0CmxpbnV4LXJpc2N2QGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmlu ZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1yaXNjdgo=