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28 Apr 2022 09:02:25 -0700 Message-ID: Date: Thu, 28 Apr 2022 09:02:25 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.8.1 Subject: Re: [RFC PATCH 1/2] swiotlb: Split up single swiotlb lock Content-Language: en-US To: Robin Murphy , Christoph Hellwig References: <20220428141429.1637028-1-ltykernel@gmail.com> <20220428141429.1637028-2-ltykernel@gmail.com> <1517d2f0-08d6-a532-7810-2161b2dff421@linux.intel.com> From: Andi Kleen In-Reply-To: Cc: parri.andrea@gmail.com, thomas.lendacky@amd.com, wei.liu@kernel.org, Tianyu Lan , konrad.wilk@oracle.com, linux-hyperv@vger.kernel.org, Tianyu Lan , linux-kernel@vger.kernel.org, michael.h.kelley@microsoft.com, iommu@lists.linux-foundation.org, andi.kleen@intel.com, brijesh.singh@amd.com, vkuznets@redhat.com, kys@microsoft.com, kirill.shutemov@intel.com, hch@lst.de 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" Ck9uIDQvMjgvMjAyMiA4OjA3IEFNLCBSb2JpbiBNdXJwaHkgd3JvdGU6Cj4gT24gMjAyMi0wNC0y OCAxNTo1NSwgQW5kaSBLbGVlbiB3cm90ZToKPj4KPj4gT24gNC8yOC8yMDIyIDc6NDUgQU0sIENo cmlzdG9waCBIZWxsd2lnIHdyb3RlOgo+Pj4gT24gVGh1LCBBcHIgMjgsIDIwMjIgYXQgMDM6NDQ6 MzZQTSArMDEwMCwgUm9iaW4gTXVycGh5IHdyb3RlOgo+Pj4+IFJhdGhlciB0aGFuIGludHJvZHVj ZSB0aGlzIGV4dHJhIGxldmVsIG9mIGFsbG9jYXRvciBjb21wbGV4aXR5LCBob3cgCj4+Pj4gYWJv dXQKPj4+PiBqdXN0IGRpdmlkaW5nIHVwIHRoZSBpbml0aWFsIFNXSU9UTEIgYWxsb2NhdGlvbiBp bnRvIG11bHRpcGxlIAo+Pj4+IGlvX3RsYl9tZW0KPj4+PiBpbnN0YW5jZXM/Cj4+PiBZZWFoLsKg IFdlJ3JlIGFsbW9zdCBkb25lIHJlbW92aW5nIGFsbCBrbm93bGVkZ2Ugb2Ygc3dpb3RsYiBmcm9t IAo+Pj4gZHJpdmVycywKPj4+IHNvIHRoZSB2ZXJ5IGxhc3QgdGhpbmcgSSB3YW50IGlzIGFuIGlu dGVyZmFjZSB0aGF0IGFsbG93cyBhIGRyaXZlciB0bwo+Pj4gYWxsb2NhdGUgYSBwZXItZGV2aWNl IGJ1ZmZlci4KPj4KPj4gQXQgbGVhc3QgZm9yIFREWCBuZWVkIHBhcmFsbGVsaXNtIHdpdGggYSBz aW5nbGUgZGV2aWNlIGZvciBwZXJmb3JtYW5jZS4KPj4KPj4gU28gaWYgeW91IHNwbGl0IHVwIHRo ZSBpbyB0bGIgbWVtcyBmb3IgYSBkZXZpY2UgdGhlbiB5b3Ugd291bGQgbmVlZCBhIAo+PiBuZXcg bWVjaGFuaXNtIHRvIGxvYWQgYmFsYW5jZSB0aGUgcmVxdWVzdHMgZm9yIHNpbmdsZSBkZXZpY2Ug b3ZlciAKPj4gdGhvc2UuIEkgZG91YnQgaXQgd291bGQgYmUgYW55IHNpbXBsZXIuCj4KPiBFaCwg SSB0aGluayBpdCB3b3VsZCBiZSwgc2luY2UgdGhlIHJvdW5kLXJvYmluIHJldHJ5IGxvb3AgY2Fu IHRoZW4gCj4ganVzdCBzaXQgYXJvdW5kIHRoZSBleGlzdGluZyBpb190bGJfbWVtLWJhc2VkIGFs bG9jYXRvciwgdnMuIHRoZSBjaHVybiAKPiBvZiBpbnNlcnRpbmcgaXQgaW4gdGhlIG1pZGRsZSwg cGx1cyBpdCdzIHRoZW4gcmVhbGx5IGVhc3kgdG8gCj4gc3RhdGljYWxseSBkaXN0cmlidXRlIGRp ZmZlcmVudCBzdGFydGluZyBwb2ludHMgYWNyb3NzIGRpZmZlcmVudCAKPiBkZXZpY2VzIHZpYSBk ZXYtPmRtYV9pb190bGJfbWVtIGlmIHdlIHdhbnRlZCB0by4KPgo+IEFkbWl0dGVkbHkgdGhlIG92 ZXJhbGwgcGF0Y2ggcHJvYmFibHkgZW5kcyB1cCBhYm91dCB0aGUgc2FtZSBzaXplLCAKPiBzaW5j ZSBpdCBsaWtlbHkgcHVzaGVzIGEgYml0IG1vcmUgY29tcGxleGl0eSBpbnRvIHN3aW90bGJfaW5p dCB0byAKPiBjb21wZW5zYXRlLCBidXQgdGhhdCdzIHN0aWxsIGEgdHJhZGUtb2ZmIEkgbGlrZS4K ClVubGVzcyB5b3UgY29tcGxldGVseSBicmVhayB0aGUgZXh0ZXJuYWwgQVBJIHRoaXMgd2lsbCBy ZXF1aXJlIGEgbmV3IAptZWNoYW5pc20gdG8gc2VhcmNoIGEgbGlzdCBvZiBpb190bGJfbWVtcyBm b3IgdGhlIHJpZ2h0IGFyZWEgdG8gZnJlZSBpbnRvLgoKSWYgdGhlIG1lbW9yeSBhcmVhIG5vdCBj b250aWd1b3VzIChsaWtlIGluIHRoZSBvcmlnaW5hbCBwYXRjaCkgdGhpcyB3aWxsIApiZSBhIE8o bikgb3BlcmF0aW9uIG9uIHRoZSBudW1iZXIgb2YgaW9fdGxiX21lbXMsIHNvIGl0IHdvdWxkIGdl dCBtb3JlIAphbmQgbW9yZSBleHBlbnNpdmUgb24gbGFyZ2VyIHN5c3RlbXMuIE9yIHlvdSBtZXJn ZSB0aGVtIGFsbCB0b2dldGhlciAoc28gCnRoYXQgdGhlIHNpbXBsZSBhZGRyZXNzIGFyaXRobWV0 aWMgdG8gbG9vayB1cCB0aGUgYXJlYSB3b3JrcyBhZ2FpbiksIAp3aGljaCB3aWxsIHJlcXVpcmUg ZXZlbiBtb3JlIGNoYW5nZXMgaW4gdGhlIHNldHVwLiBPciB5b3UgYWRkIGhhc2hpbmcgb3IgCnNp bWlsYXIgd2hpY2ggd2lsbCBiZSBldmVuIG1vcmUgY29tcGxpY2F0ZWQuCgpJbiB0aGUgZW5kIGRv aW5nIGl0IHdpdGggYSBzaW5nbGUgaW9fdGxiX21lbSBpcyBzaWduaWZpY2FudGx5IHNpbXBsZXIg CmFuZCBhbHNvIG1vcmUgbmF0dXJhbC4KCi1BbmRpCgoKX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX18KaW9tbXUgbWFpbGluZyBsaXN0CmlvbW11QGxpc3RzLmxp bnV4LWZvdW5kYXRpb24ub3JnCmh0dHBzOi8vbGlzdHMubGludXhmb3VuZGF0aW9uLm9yZy9tYWls bWFuL2xpc3RpbmZvL2lvbW11