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Wed, 2 Jun 2021 09:38:01 +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 4.94.2) (envelope-from ) id 1loNK2-004zX9-Vi; Wed, 02 Jun 2021 10:37:59 +0100 Date: Wed, 02 Jun 2021 10:37:58 +0100 Message-ID: <878s3s1ua1.wl-maz@kernel.org> From: Marc Zyngier To: Shanker R Donthineni Subject: Re: [RFC 1/2] vfio/pci: keep the prefetchable attribute of a BAR region in VMA In-Reply-To: <273ba1c2-dfe6-7dc1-3e40-03398e82469b@nvidia.com> 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> <273ba1c2-dfe6-7dc1-3e40-03398e82469b@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, catalin.marinas@arm.com, will@kernel.org, vsethi@nvidia.com, alex.williamson@redhat.com, mark.kettenis@xs4all.nl, christoffer.dall@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, 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 Cc: "kvm@vger.kernel.org" , Catalin Marinas , "linux-kernel@vger.kernel.org" , Vikram Sethi , Alex Williamson , Jason Sequeira , Will Deacon , "kvmarm@lists.cs.columbia.edu" , "linux-arm-kernel@lists.infradead.org" , Mark Kettenis X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu SGkgU2hhbmtlciwKCk9uIFNhdCwgMDggTWF5IDIwMjEgMTc6MzM6MTEgKzAxMDAsClNoYW5rZXIg UiBEb250aGluZW5pIDxzZG9udGhpbmVuaUBudmlkaWEuY29tPiB3cm90ZToKPiAKPiBIaSBNYXJj LAo+IAo+IE9uIDUvNS8yMSAxOjAyIFBNLCBDYXRhbGluIE1hcmluYXMgd3JvdGU6Cj4gPj4+IFdp bGwvQ2F0YWxpbiwgcGVyaGFwcyB5b3UgY291bGQgZXhwbGFpbiB5b3VyIHRob3VnaHQgcHJvY2Vz cyBvbiB3aHkgeW91IGNob3NlCj4gPj4+IE5vcm1hbCBOQyBmb3IgaW9yZW1hcF93YyBvbiB0aGUg YXJtdjggbGludXggcG9ydCBpbnN0ZWFkIG9mIERldmljZSBHUkUgb3Igb3RoZXIKPiA+Pj4gRGV2 aWNlIEd4eC4KPiA+PiBJIHRoaW5rIGEgY29tYmluYXRpb24gb2Y6IGNvbXBhdGliaWxpdHkgd2l0 aCAzMi1iaXQgQXJtLCB0aGUgbmVlZCB0bwo+ID4+IHN1cHBvcnQgdW5hbGlnbmVkIGFjY2Vzc2Vz IGFuZCB0aGUgcG90ZW50aWFsIGZvciBoaWdoZXIgcGVyZm9ybWFuY2UuCj4gPiBJSVJDIHRoZSBf d2Mgc3VmZml4IGFsc28gbWF0Y2hlcyB0aGUgcGdwcm90X3dyaXRlY29tYmluZSgpIHVzZWQgYnkg c29tZQo+ID4gZHJpdmVycyB0byBtYXAgYSB2aWRlbyBmcmFtZWJ1ZmZlciBpbnRvIHVzZXIgc3Bh Y2UuIEFjY2Vzc2VzIHRvIHRoZQo+ID4gZnJhbWVidWZmZXIgYXJlIG5vdCBndWFyYW50ZWVkIHRv IGJlIGFsaWduZWQgKG1lbXNldC9tZW1jcHkgZG9uJ3QgZW5zdXJlCj4gPiBhbGlnbm1lbnQgb24g YXJtNjQgYW5kIHRoZSB1c2VyIGRvZXNuJ3QgaGF2ZSBhIG1lbXNldF9pbyBvciBtZW1jcHlfdG9p bykuCj4gPgo+ID4+IEZ1cnRoZXJtb3JlLCBpb3JlbWFwKCkgYWxyZWFkeSBnaXZlcyB5b3UgYSBE ZXZpY2UgbWVtb3J5IHR5cGUsIGFuZCB3ZSdyZQo+ID4+IHRpZ2h0IG9uIE1BSVIgc3BhY2UuCj4g PiBXZSBoYXZlIE1UX0RFVklDRV9HUkUgY3VycmVudGx5IHJlc2VydmVkIHRob3VnaCBubyBpbi1r ZXJuZWwgdXNlciwgd2UKPiA+IG1pZ2h0IGFzIHdlbGwgcmVtb3ZlIGl0Lgo+IEBNYXJjLCBDb3Vs ZCB5b3UgcHJvdmlkZSB5b3VyIHRob3VnaHRzL2d1aWRhbmNlIGZvciB0aGUgbmV4dCBzdGVwPyBU aGUKPiBwcm9wb3NhbCBvZiBnZXR0aW5nIGhpbnRzIGZvciBwcmVmZXRjaGFibGUgcmVnaW9ucyBm cm9tIFZGSU8vUUVNVSBpcyBub3QKPiByZWNvbW1lbmRlZCwgVGhlIG9ubHkgb3B0aW9uIGxlZnQg aXMgdG8gaW1wbGVtZW50IEFSTTY0IGRlcGVuZGVudCBsb2dpYwo+IGluIEtWTS4KPiAKPiBPcHRp b24tMTogSSB0aGluayB3ZSBjb3VsZCB0YWtlIGFkdmFudGFnZSBvZiBzdGFnZS0xLzIgY29tYmlu aW5nIHJ1bGVzIHRvCj4gYWxsb3cgTk9STUFMX05DIG1lbW9yeS10eXBlIGZvciBkZXZpY2UgbWVt b3J5IGluIFZNLiBBbHdheXMgbWFwCj4gZGV2aWNlIG1lbW9yeSBhdCBzdGFnZS0yIGFzIE5PUk1B TC1OQyBhbmQgdHJ1c3QgVk0ncyBzdGFnZS0xIE1ULgo+IAo+IC0tLS0tLS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLQo+IFN0YWdlLTIgTVTC oMKgwqDCoCBTdGFnZS0xIE1UwqDCoMKgIFJlc3VsdGFudCBNVCAoY29tYmluaW5nLXJ1bGVzL0ZX QikKPiAtLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0KPiBOb3JtYWwtTkPCoMKgwqDCoMKgIE5vcm1hbC1XVMKgwqDCoMKgwqDCoMKg wqDCoMKgIE5vcm1hbC1OQwo+IMKgwqAgLcKgwqDCoMKgwqDCoMKgwqDCoMKgIE5vcm1hbC1XQsKg wqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgIC0KPiDCoMKgIC3CoMKgwqDCoMKgwqDCoMKgwqDCoCBO b3JtYWwtTkPCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCAtCj4gwqDCoCAtwqDCoMKgwqDCoMKg wqDCoMKgwqAgRGV2aWNlLTxhdHRyPsKgwqDCoMKgwqDCoCBEZXZpY2UtPGF0dHI+Cj4gLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t CgpJIHRoaW5rIHRoaXMgaXMgdW53aXNlLgoKV2lsbCByZWNlbnRseSBkZWJ1Z2dlZCBhIHByZXR0 eSBob3JyaWJsZSBzaXR1YXRpb24gd2hlbiBkb2luZyBleGFjdGx5CnRoYXQ6IHdoZW4gUzEgaXMg b2ZmIGFuZCBTMiBpcyBvbiwgdGhlIEktc2lkZSBpcyBhbGxvd2VkIHRvIGdlbmVyYXRlCnNwZWN1 bGF0aXZlIGFjY2Vzc2VzIChzZWUgQVJNdjggQVJNIEcuYSBENS4yLjkgZm9yIHRoZSBkZXRhaWxz KS4gQW5kCnllcywgaW1wbGVtZW50YXRpb25zIGRlZmluaXRlbHkgZG8gdGhhdC4gQWRkIHNpZGUt ZWZmZWN0IHJlYWRzIHRvIHRoZQptaXgsIGFuZCB5b3UncmUgaW4gZm9yIGEgdHJlYXQuCgo+IFdl J3ZlIGJlZW4gdXNpbmcgdGhpcyBvcHRpb24gaW50ZXJuYWxseSBmb3IgdGVzdGluZyBwdXJwb3Nl IGFuZAo+IHZhbGlkYXRlZCB3aXRoIE5WTUUvTWVsbGFub3gvR1BVIHBhc3MtdGhyb3VnaCBkZXZp Y2VzIG9uCj4gTWFydmVsbC1UaHVuZGV4MiBwbGF0Zm9ybS4KClNlZSBhYm92ZS4gSXQgKndpbGwq IGJyZWFrIGV2ZW50dWFsbHkuCgo+IE9wdGlvbi0yOiBHZXQgcmVzb3VyY2UgcHJvcGVydGllcyBh c3NvY2lhdGVkIHdpdGggTU1JTyB1c2luZyBsb29rdXBfcmVzb3VyY2UoKQo+IGFuZCBtYXAgYXQg c3RhZ2UtMiBhcyBOb3JtYWwtTkMgaWYgSU9SRVNPVVJDRV9QUkVGRVRDSCBpcyBzZXQgaW4gZmxh Z3MuCgpUaGF0J3MgYSBwcmV0dHkgcm91bmRhYm91dCB3YXkgb2YgZG9pbmcgZXhhY3RseSB0aGUg c2FtZSB0aGluZyB5b3UKaW5pdGlhbGx5IHByb3Bvc2VkLiBBbmQgaXQgc3VmZmVycyBmcm9tIHRo ZSBleGFjdCBzYW1lIHByb2JsZW1zLCB3aGljaAppcyB0aGF0IHlvdSBjaGFuZ2UgdGhlIHNlbWFu dGljcyBvZiB0aGUgbWFwcGluZyB3aXRob3V0IGtub3dpbmcgd2hhdAp0aGUgZ3Vlc3QncyBpbnRl bnQgaXMuCgoJTS4KCi0tIApXaXRob3V0IGRldmlhdGlvbiBmcm9tIHRoZSBub3JtLCBwcm9ncmVz cyBpcyBub3QgcG9zc2libGUuCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fCmt2bWFybSBtYWlsaW5nIGxpc3QKa3ZtYXJtQGxpc3RzLmNzLmNvbHVtYmlhLmVk dQpodHRwczovL2xpc3RzLmNzLmNvbHVtYmlhLmVkdS9tYWlsbWFuL2xpc3RpbmZvL2t2bWFybQo=