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Sat, 8 May 2021 16:33:15 +0000 Subject: Re: [RFC 1/2] vfio/pci: keep the prefetchable attribute of a BAR region in VMA To: Catalin Marinas , Will Deacon CC: Vikram Sethi , Alex Williamson , Mark Kettenis , "Marc Zyngier" , "christoffer.dall@arm.com" , "linux-arm-kernel@lists.infradead.org" , "kvmarm@lists.cs.columbia.edu" , "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , Jason Sequeira References: <878s4zokll.wl-maz@kernel.org> <87eeeqvm1d.wl-maz@kernel.org> <87bl9sunnw.wl-maz@kernel.org> <20210503084432.75e0126d@x1.home.shazbot.org> <20210504083005.GA12290@willie-the-truck> <20210505180228.GA3874@arm.com> From: Shanker R Donthineni Message-ID: <273ba1c2-dfe6-7dc1-3e40-03398e82469b@nvidia.com> Date: Sat, 8 May 2021 11:33:11 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210505180228.GA3874@arm.com> Content-Language: en-US X-Originating-IP: [172.20.145.6] X-ClientProxiedBy: HQMAIL101.nvidia.com (172.20.187.10) To HQMAIL107.nvidia.com (172.20.187.13) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 1933258b-34ed-4da5-1154-08d9123efcb0 X-MS-TrafficTypeDiagnostic: DM6PR12MB3705: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; 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charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org SGkgTWFyYywKCk9uIDUvNS8yMSAxOjAyIFBNLCBDYXRhbGluIE1hcmluYXMgd3JvdGU6Cj4+PiBX aWxsL0NhdGFsaW4sIHBlcmhhcHMgeW91IGNvdWxkIGV4cGxhaW4geW91ciB0aG91Z2h0IHByb2Nl c3Mgb24gd2h5IHlvdSBjaG9zZQo+Pj4gTm9ybWFsIE5DIGZvciBpb3JlbWFwX3djIG9uIHRoZSBh cm12OCBsaW51eCBwb3J0IGluc3RlYWQgb2YgRGV2aWNlIEdSRSBvciBvdGhlcgo+Pj4gRGV2aWNl IEd4eC4KPj4gSSB0aGluayBhIGNvbWJpbmF0aW9uIG9mOiBjb21wYXRpYmlsaXR5IHdpdGggMzIt Yml0IEFybSwgdGhlIG5lZWQgdG8KPj4gc3VwcG9ydCB1bmFsaWduZWQgYWNjZXNzZXMgYW5kIHRo ZSBwb3RlbnRpYWwgZm9yIGhpZ2hlciBwZXJmb3JtYW5jZS4KPiBJSVJDIHRoZSBfd2Mgc3VmZml4 IGFsc28gbWF0Y2hlcyB0aGUgcGdwcm90X3dyaXRlY29tYmluZSgpIHVzZWQgYnkgc29tZQo+IGRy aXZlcnMgdG8gbWFwIGEgdmlkZW8gZnJhbWVidWZmZXIgaW50byB1c2VyIHNwYWNlLiBBY2Nlc3Nl cyB0byB0aGUKPiBmcmFtZWJ1ZmZlciBhcmUgbm90IGd1YXJhbnRlZWQgdG8gYmUgYWxpZ25lZCAo bWVtc2V0L21lbWNweSBkb24ndCBlbnN1cmUKPiBhbGlnbm1lbnQgb24gYXJtNjQgYW5kIHRoZSB1 c2VyIGRvZXNuJ3QgaGF2ZSBhIG1lbXNldF9pbyBvciBtZW1jcHlfdG9pbykuCj4KPj4gRnVydGhl cm1vcmUsIGlvcmVtYXAoKSBhbHJlYWR5IGdpdmVzIHlvdSBhIERldmljZSBtZW1vcnkgdHlwZSwg YW5kIHdlJ3JlCj4+IHRpZ2h0IG9uIE1BSVIgc3BhY2UuCj4gV2UgaGF2ZSBNVF9ERVZJQ0VfR1JF IGN1cnJlbnRseSByZXNlcnZlZCB0aG91Z2ggbm8gaW4ta2VybmVsIHVzZXIsIHdlCj4gbWlnaHQg YXMgd2VsbCByZW1vdmUgaXQuCkBNYXJjLCBDb3VsZCB5b3UgcHJvdmlkZSB5b3VyIHRob3VnaHRz L2d1aWRhbmNlIGZvciB0aGUgbmV4dCBzdGVwPyBUaGUKcHJvcG9zYWwgb2YgZ2V0dGluZyBoaW50 cyBmb3IgcHJlZmV0Y2hhYmxlIHJlZ2lvbnMgZnJvbSBWRklPL1FFTVUgaXMgbm90CnJlY29tbWVu ZGVkLCBUaGUgb25seSBvcHRpb24gbGVmdCBpcyB0byBpbXBsZW1lbnQgQVJNNjQgZGVwZW5kZW50 IGxvZ2ljCmluIEtWTS4KCk9wdGlvbi0xOiBJIHRoaW5rIHdlIGNvdWxkIHRha2UgYWR2YW50YWdl IG9mIHN0YWdlLTEvMiBjb21iaW5pbmcgcnVsZXMgdG8KYWxsb3cgTk9STUFMX05DIG1lbW9yeS10 eXBlIGZvciBkZXZpY2UgbWVtb3J5IGluIFZNLiBBbHdheXMgbWFwCmRldmljZSBtZW1vcnkgYXQg c3RhZ2UtMiBhcyBOT1JNQUwtTkMgYW5kIHRydXN0IFZNJ3Mgc3RhZ2UtMSBNVC4KCi0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLQpT dGFnZS0yIE1UwqDCoMKgwqAgU3RhZ2UtMSBNVMKgwqDCoCBSZXN1bHRhbnQgTVQgKGNvbWJpbmlu Zy1ydWxlcy9GV0IpCi0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLQpOb3JtYWwtTkPCoMKgwqDCoMKgIE5vcm1hbC1XVMKgwqDCoMKg wqDCoMKgwqDCoMKgIE5vcm1hbC1OQwrCoMKgIC3CoMKgwqDCoMKgwqDCoMKgwqDCoCBOb3JtYWwt V0LCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCAtCsKgwqAgLcKgwqDCoMKgwqDCoMKgwqDCoMKg IE5vcm1hbC1OQ8KgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgIC0KwqDCoCAtwqDCoMKgwqDCoMKg wqDCoMKgwqAgRGV2aWNlLTxhdHRyPsKgwqDCoMKgwqDCoCBEZXZpY2UtPGF0dHI+Ci0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLQoK V2UndmUgYmVlbiB1c2luZyB0aGlzIG9wdGlvbiBpbnRlcm5hbGx5IGZvciB0ZXN0aW5nIHB1cnBv c2UgYW5kIHZhbGlkYXRlZCB3aXRoCk5WTUUvTWVsbGFub3gvR1BVIHBhc3MtdGhyb3VnaCBkZXZp Y2VzIG9uIE1hcnZlbGwtVGh1bmRleDIgcGxhdGZvcm0uCgpPcHRpb24tMjogR2V0IHJlc291cmNl IHByb3BlcnRpZXMgYXNzb2NpYXRlZCB3aXRoIE1NSU8gdXNpbmcgbG9va3VwX3Jlc291cmNlKCkK YW5kIG1hcCBhdCBzdGFnZS0yIGFzIE5vcm1hbC1OQyBpZiBJT1JFU09VUkNFX1BSRUZFVENIIGlz IHNldCBpbiBmbGFncy4KCgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBs aXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlz dGluZm8vbGludXgtYXJtLWtlcm5lbAo=