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([2404:f801:9000:1a:efea::754]) by smtp.gmail.com with ESMTPSA id s2sm13819900pfk.3.2022.02.21.07.15.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 21 Feb 2022 07:15:06 -0800 (PST) Message-ID: <23f4a64d-5977-1816-8faa-fe7691ace2ff@gmail.com> Date: Mon, 21 Feb 2022 23:14:58 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.6.0 Subject: Re: [PATCH V2 1/2] Swiotlb: Add swiotlb_alloc_from_low_pages switch Content-Language: en-US From: Tianyu Lan To: Christoph Hellwig References: <20220209122302.213882-1-ltykernel@gmail.com> <20220209122302.213882-2-ltykernel@gmail.com> <20220214081919.GA18337@lst.de> <4f433f07-05be-f81f-43e8-55c3f1af23b3@gmail.com> <20220214135834.GA30150@lst.de> <8d052867-ccff-f00f-7c89-cc26a4bfa347@gmail.com> In-Reply-To: <8d052867-ccff-f00f-7c89-cc26a4bfa347@gmail.com> Cc: linux-hyperv@vger.kernel.org, brijesh.singh@amd.com, dave.hansen@linux.intel.com, hpa@zytor.com, kys@microsoft.com, hch@infradead.org, wei.liu@kernel.org, sthemmin@microsoft.com, x86@kernel.org, decui@microsoft.com, michael.h.kelley@microsoft.com, mingo@redhat.com, parri.andrea@gmail.com, thomas.lendacky@amd.com, Tianyu Lan , konrad.wilk@oracle.com, haiyangz@microsoft.com, bp@alien8.de, tglx@linutronix.de, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, vkuznets@redhat.com, robin.murphy@arm.com X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" T24gMi8xNS8yMDIyIDExOjMyIFBNLCBUaWFueXUgTGFuIHdyb3RlOgo+IE9uIDIvMTQvMjAyMiA5 OjU4IFBNLCBDaHJpc3RvcGggSGVsbHdpZyB3cm90ZToKPj4gT24gTW9uLCBGZWIgMTQsIDIwMjIg YXQgMDc6Mjg6NDBQTSArMDgwMCwgVGlhbnl1IExhbiB3cm90ZToKPj4+IE9uIDIvMTQvMjAyMiA0 OjE5IFBNLCBDaHJpc3RvcGggSGVsbHdpZyB3cm90ZToKPj4+PiBBZGRpbmcgYSBmdW5jdGlvbiB0 byBzZXQgdGhlIGZsYWcgZG9lc24ndCByZWFsbHkgY2hhbmdlIG11Y2guwqAgQXMgUm9iaW4KPj4+ PiBwb2ludGVkIG91dCBsYXN0IHRpbWUgeW91IHNob3VsZCBmaW5lIGEgd2F5IHRvIGp1c3QgY2Fs bAo+Pj4+IHN3aW90bGJfaW5pdF93aXRoX3RibCBkaXJlY3RseSB3aXRoIHRoZSBtZW1vcnkgYWxs b2NhdGVkIHRoZSB3YXkgeW91Cj4+Pj4gbGlrZSBpdC7CoCBPciBnaXZlbiB0aGF0IHdlIGhhdmUg cXVpdGUgYSBmZXcgb2YgdGhlc2UgdHJ1c3RlZCBoeXBlcnZpc29yCj4+Pj4gc2NoZW1lcyBtYXli ZSBhZGQgYW4gYXJndW1lbnQgdG8gc3dpb3RsYl9pbml0IHRoYXQgc3BlY2lmaWVzIGhvdyB0bwo+ Pj4+IGFsbG9jYXRlIHRoZSBtZW1vcnkuCj4+Pgo+Pj4gVGhhbmtzIGZvciB5b3VyIHN1Z2dlc3Rp b24uIEkgd2lsbCB0cnkgdGhlIGZpcnN0IGFwcHJvYWNoIGZpcnN0IAo+Pj4gYXBwcm9hY2guCj4+ Cj4+IFRha2UgYSBsb29rIGF0IHRoZSBTV0lPVExCX0FOWSBmbGFnIGluIHRoaXMgV0lQIGJyYW5j aDoKPj4KPj4gICAgIAo+PiBodHRwOi8vZ2l0LmluZnJhZGVhZC5vcmcvdXNlcnMvaGNoL21pc2Mu Z2l0L3Nob3J0bG9nL3JlZnMvaGVhZHMvc3dpb3RsYi1pbml0LWNsZWFudXAgCj4+Cj4+Cj4+IFRo YXQgYmVpbmcgc2FpZCBJJ20gbm90IHN1cmUgdGhhdCBlaXRoZXIgdGhpcyBmbGFnIG9yIHRoZSBl eGlzdGluZyAKPj4gcG93ZXJwYwo+PiBjb2RlIGnRlSBhY3R1YWxseSB0aGUgcmlnaHQgdGhpbmcg dG8gZG8uwqAgV2Ugc3RpbGwgbmVlZCB0aGUgNEcgbGltaXRlZAo+PiBidWZmZXIgdG8gc3VwcG9y dCBkZXZpY2VzIHdpdGggYWRkcmVzc2luZyBsaW1pdGF0aW9ucy7CoCBTbyBJIHRoaW5rIHdlIAo+ PiBuZWVkCj4+IGFuIGFkZGl0aW9uYWwgaW9fdGxiX21lbSBpbnN0YW5jZSBmb3IgdGhlIGRldmlj ZXMgd2l0aG91dCBhZGRyZXNzaW5nCj4+IGxpbWl0YXRpb25zIGluc3RlYWQuCj4+Cj4gCj4gSGkg Q2hyaXN0b3BoOgo+ICDCoMKgwqDCoCBUaGFua3MgZm9yIHlvdXIgcGF0Y2hlcy4gSSB0ZXN0ZWQg dGhlc2UgcGF0Y2hlcyBpbiBIeXBlci1WIHRydXN0ZWQgCj4gVk0gYW5kIHN5c3RlbSBjYW4ndCBi b290IHVwLiBJIGFtIGRlYnVnZ2luZyBhbmQgd2lsbCByZXBvcnQgYmFjay4KClNvcnJ5LiBUaGUg Ym9vdCBmYWlsdXJlIGlzIG5vdCByZWxhdGVkIHdpdGggdGhlc2UgcGF0Y2hlcyBhbmQgdGhlIGlz c3VlCmhhcyBiZWVuIGZpeGVkIGluIHRoZSBsYXRlc3QgdXBzdHJlYW0gY29kZS4KClRoZXJlIGlz IGEgcGVyZm9ybWFuY2UgYm90dGxlbmVjayBkdWUgdG8gaW8gdGxiIG1lbSdzIHNwaW4gbG9jayBk dXJpbmcKcGVyZm9ybWFuY2UgdGVzdC4gQWxsIGRldmljZXMnaW8gcXVldWVzIHVzZXMgc2FtZSBp byB0bGIgbWVtIGVudHJ5CmFuZCB0aGUgc3BpbiBsb2NrIG9mIGlvIHRsYiBtZW0gaW50cm9kdWNl IG92ZXJoZWFkcy4gVGhlcmUgaXMgYSBmaXggCnBhdGNoIGZyb20gQW5kaSBLbGVlbiBpbiB0aGUg Z2l0aHViLiBDb3VsZCB5b3UgaGF2ZSBhIGxvb2s/CgpodHRwczovL2dpdGh1Yi5jb20vaW50ZWwv dGR4L2NvbW1pdC80NTI5YjU3ODRjMTQxNzgyYzcyZWM5YmQ5YTkyZGYyYjY4Y2I3ZDQ1CgpUaGFu a3MuCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwppb21t dSBtYWlsaW5nIGxpc3QKaW9tbXVAbGlzdHMubGludXgtZm91bmRhdGlvbi5vcmcKaHR0cHM6Ly9s aXN0cy5saW51eGZvdW5kYXRpb24ub3JnL21haWxtYW4vbGlzdGluZm8vaW9tbXU=