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Fri, 30 Apr 2021 15:31:06 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0053B61352; Fri, 30 Apr 2021 15:31:05 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1lcV6c-00ADmW-Sk; Fri, 30 Apr 2021 16:31:02 +0100 Date: Fri, 30 Apr 2021 16:31:02 +0100 Message-ID: <878s4zokll.wl-maz@kernel.org> From: Marc Zyngier To: Shanker R Donthineni Cc: Alex Williamson , Will Deacon , Catalin Marinas , "Christoffer\ Dall" , , , , , Vikram Sethi , Jason Sequeira Subject: Re: [RFC 1/2] vfio/pci: keep the prefetchable attribute of a BAR region in VMA In-Reply-To: <1edb2c4e-23f0-5730-245b-fc6d289951e1@nvidia.com> References: <20210429162906.32742-1-sdonthineni@nvidia.com> <20210429162906.32742-2-sdonthineni@nvidia.com> <20210429122840.4f98f78e@redhat.com> <470360a7-0242-9ae5-816f-13608f957bf6@nvidia.com> <20210429134659.321a5c3c@redhat.com> <87czucngdc.wl-maz@kernel.org> <1edb2c4e-23f0-5730-245b-fc6d289951e1@nvidia.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: sdonthineni@nvidia.com, alex.williamson@redhat.com, will@kernel.org, catalin.marinas@arm.com, christoffer.dall@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, vsethi@nvidia.com, jsequeira@nvidia.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210430_083105_453858_BCCDE71C X-CRM114-Status: GOOD ( 27.27 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gRnJpLCAzMCBBcHIgMjAyMSAxNTo1ODoxNCArMDEwMCwKU2hhbmtlciBSIERvbnRoaW5lbmkg PHNkb250aGluZW5pQG52aWRpYS5jb20+IHdyb3RlOgo+IAo+IEhpIE1hcmMsCj4gCj4gT24gNC8z MC8yMSA2OjQ3IEFNLCBNYXJjIFp5bmdpZXIgd3JvdGU6Cj4gPgo+ID4+Pj4gV2UndmUgdHdvIGNv bmNlcm5zIGhlcmU6Cj4gPj4+PiAgICAtIFBlcmZvcm1hbmNlIGltcGFjdHMgZm9yIHBhc3MtdGhy b3VnaCBkZXZpY2VzLgo+ID4+Pj4gICAgLSBUaGUgZGVmaW5pdGlvbiBvZiBpb3JlbWFwX3djKCkg ZnVuY3Rpb24gZG9lc24ndCBtYXRjaCB0aGUgaG9zdAo+ID4+Pj4ga2VybmVsIG9uIEFSTTY0Cj4g Pj4+IFBlcmZvcm1hbmNlIEkgY2FuIHVuZGVyc3RhbmQsIGJ1dCBJIHRoaW5rIHlvdSdyZSBhbHNv IHVzaW5nIGl0IHRvIG1hc2sKPiA+Pj4gYSBkcml2ZXIgYnVnIHdoaWNoIHNob3VsZCBiZSByZXNv bHZlZCBmaXJzdC4gIFRoYW5rCj4gPj4gV2XigJl2ZSBhbHJlYWR5IGluc3RydW1lbnRlZCB0aGUg ZHJpdmVyIGNvZGUgYW5kIGZvdW5kIHRoZSBjb2RlIHBhdGgKPiA+PiBmb3IgdGhlIHVuYWxpZ25l ZCBhY2Nlc3Nlcy4gV2XigJlsbCBmaXggdGhpcyBpc3N1ZSBpZiBpdOKAmXMgbm90Cj4gPj4gZm9s bG93aW5nIFdDIHNlbWFudGljcy4KPiA+Pgo+ID4+IEZpeGluZyB0aGUgcGVyZm9ybWFuY2UgY29u Y2VybiB3aWxsIGJlIHVuZGVyIEtWTSBzdGFnZS0yIHBhZ2UtdGFibGUKPiA+PiBjb250cm9sLiBX ZSdyZSBsb29raW5nIGZvciBhIGd1aWRhbmNlL3NvbHV0aW9uIGZvciB1cGRhdGluZyBzdGFnZS0y Cj4gPj4gUFRFIGJhc2VkIG9uIFBDSS1CQVIgYXR0cmlidXRlLgo+ID4gQmVmb3JlIHdlIHN0YXJ0 IGRpc2N1c3NpbmcgdGhlICpob3cqLCBJJ2QgbGlrZSB0byBjbGVhcmx5IHVuZGVyc3RhbmQKPiA+ IHdoYXQgKmFybTY0KiBtZW1vcnkgYXR0cmlidXRlcyB5b3UgYXJlIHJlbHlpbmcgb24uIFdlIGFs cmVhZHkgaGF2ZQo+ID4gZXN0YWJsaXNoZWQgdGhhdCB0aGUgdW5hbGlnbmVkIGFjY2VzcyB3YXMg YSBidWcsIHdoaWNoIHdhcyB0aGUgYmlnZ2VzdAo+ID4gYXJndW1lbnQgaW4gZmF2b3VyIG9mIE5P Uk1BTF9OQy4gV2hhdCBhcmUgdGhlIG90aGVyIHJlcXVpcmVtZW50cz8KPiBTb3JyeSwgbXkgZWFy bGllciByZXNwb25zZSB3YXMgbm90IGNvbXBsZXRlLi4uCj4gCj4gQVJNdjggYXJjaGl0ZWN0dXJl IGhhcyB0d28gZmVhdHVyZXMgR2F0aGVyaW5nIGFuZCBSZW9yZGVyCj4gdHJhbnNhY3Rpb25zLCB2 ZXJ5IGltcG9ydGFudCBmcm9tIGEgcGVyZm9ybWFuY2UgcG9pbnQgb2Ygdmlldy4gU21hbGwKPiBp bmxpbmUgcGFja2V0cyBmb3IgTklDIGNhcmRzIGFuZCBhY2Nlc3NlcyB0byBHUFUncyBmcmFtZSBi dWZmZXIgYXJlCj4gQ1BVLWJvdW5kIG9wZXJhdGlvbnMuIFdlIHdhbnQgdG8gdGFrZSBhZHZhbnRh Z2VzIG9mIEdSRSBmZWF0dXJlcyB0bwo+IGFjaGlldmUgaGlnaGVyIHBlcmZvcm1hbmNlLgo+IAo+ IEJvdGggdGhlc2UgZmVhdHVyZXMgYXJlIGRpc2FibGVkIGZvciBwcmVmZXRjaGFibGUgQkFScyBp biBWTSBiZWNhdXNlCj4gbWVtb3J5LXR5cGUgTVRfREVWSUNFX25HblJFIGVuZm9yY2VkIGluIHN0 YWdlLTIuCgpSaWdodCwgc28gTm9ybWFsX05DIGlzIGEgcmVkIGhlcnJpbmcsIGFuZCBpdCBpcyBE ZXZpY2VfR1JFIHRoYXQgeW91CnJlYWxseSBhcmUgYWZ0ZXIsIHJpZ2h0PwoKTm93LCBJJ20gbm90 IGNvbnZpbmNlZCB0aGF0IHdlIGNhbiBkbyB0aGF0IGRpcmVjdGx5IGZyb20gdmZpbyBpbiBhCmRl dmljZS1hZ25vc3RpYyBtYW5uZXIuIEl0IGlzIHVzZXJzcGFjZSB0aGF0IHBsYWNlcyB0aGUgZGV2 aWNlIGluIHRoZQpndWVzdCdzIG1lbW9yeSwgYW5kIEkgaGF2ZSB0aGUgdWdseSBmZWVsaW5nIHRo YXQgdXNlcnNwYWNlIG5lZWRzIHRvIGJlCmluIGNvbnRyb2wgb2YgbWVtb3J5IGF0dHJpYnV0ZXMu CgpPdGhlcndpc2UsIHdlIGNoYW5nZSB0aGUgYmVoYXZpb3VyIGZvciBhbGwgZXhpc3RpbmcgZGV2 aWNlcyB0aGF0IGhhdmUKcHJlZmV0Y2hhYmxlIEJBUnMsIGFuZCBJIGRvbid0IHRoaW5rIHRoYXQn cyBhbiBhY2NlcHRhYmxlIG1vdmUKKHVzZXJzcGFjZSBBQkkgY2hhbmdlKS4KCglNLgoKLS0gCldp dGhvdXQgZGV2aWF0aW9uIGZyb20gdGhlIG5vcm0sIHByb2dyZXNzIGlzIG5vdCBwb3NzaWJsZS4K Cl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LWFy bS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1rZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9y ZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFybS1r ZXJuZWwK