From: Joerg Roedel Subject: Re: [RFC PATCH] iommu/vt-d: Add IOTLB flush support for kernel addresses Date: Fri, 23 Oct 2015 13:03:59 +0200 Message-ID: <20151023110359.GA27420@8bytes.org> References: <1445356379.4486.56.camel@infradead.org> <20151020160328.GV27420@8bytes.org> <1445357824.4486.65.camel@infradead.org> <20151023102043.GZ27420@8bytes.org> <1445596413.4113.175.camel@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: <1445596413.4113.175.camel-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: David Woodhouse Cc: "linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org" , iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Sudeep Dutt List-Id: iommu@lists.linux-foundation.org T24gRnJpLCBPY3QgMjMsIDIwMTUgYXQgMTE6MzM6MzNBTSArMDEwMCwgRGF2aWQgV29vZGhvdXNl IHdyb3RlOgo+IFdoaWNoIG1lYW5zIEknbSBwb25kZXJpbmcgKnJlbmFtaW5nKiB0bGJfZmx1c2hf a2VybmVsX3JhbmdlKCkgdG8KPiBzb21ldGhpbmcgbGlrZSBhcmNoX3RsYl9mbHVzaF9rZXJuZWxf cmFuZ2UoKSBldmVyeXdoZXJlLCB0aGVuIGhhdmluZyBhCj4gdGxiX2ZsdXNoX2tlcm5lbF9yYW5n ZSgpIGlubGluZSBmdW5jdGlvbiB3aGljaCBvcHRpb25hbGx5IGNhbGxzCj4gaW9tbXVfZmx1c2hf a2VybmVsX3JhbmdlKCkgZmlyc3QuCgpUaGF0IHNvdW5kcyBsaWtlIHNvbWUgd29yaywgYnV0IHdv dWxkIGJlIHRoZSBzdXBlciBjbGVhbiBzb2x1dGlvbiA6KQpHaXZlbiB0aGF0IG9ubHkgYSBoYW5k ZnVsIG9mIGFyY2hpdGVjdHVyZSBiZXNpZGVzIHg4NiB3aWxsIG5lZWQgaXQKKHRoaW5raW5nIG9m IEFSTTY0IGFuZCBQUEMpLCBJIHByZWZlciB0aGUgc29sdXRpb24gYmVsb3c6Cgo+IE9yIEkgY291 bGQgcmVkdWNlIHRoZSBjaHVybiBieSBhZGRpbmcgZXhwbGljaXQgY2FsbHMgdG8KPiBpb21tdV9m bHVzaF9rZXJuZWxfcmFuZ2UoKSBhdCBldmVyeSBsb2NhdGlvbiB0aGF0IGNhbGxzCj4gdGxiX2Zs dXNoX2tlcm5lbF9yYW5nZSgpLCBidXQgdGhhdCdzIGdvaW5nIHRvIGxlYWQgdG8gc29tZSBjYWxs ZXJzCj4gbWlzc2luZyB0aGUgSU9NTVUgZmx1c2guCgpFeGFjdGx5IGxpa2UgdGhpcywgYnV0IHdo ZW4gZG8gd2UgbWlzcyBhIGZsdXNoIGhlcmU/Cgo+IE5vdCBlbnRpcmVseS4gVGhlIGRldmljZSBz dGlsbCBnZXRzIHRvIHNwZWNpZnkgd2hldGhlciBpdCdzIGRvaW5nCj4gc3VwZXJ2aXNvciBvciB1 c2VyIG1vZGUgYWNjZXNzLCBmb3IgZWFjaCByZXF1ZXN0IGl0IG1ha2VzLiBJdCBkb2Vzbid0Cj4g b3BlbiB0aGUgZG9vciB0byB1c2VycyBqdXN0IHVzaW5nIGtlcm5lbCBhZGRyZXNzZXMgYW5kIGdl dHRpbmcgYXdheQo+IHdpdGggaXQhCj4gCj4gU3VyZSwgd2UgbmVlZCB0byB0cnVzdCB0aGUgKmRl dmljZSog4oCUIGJ1dCB3ZSBuZWVkIHRvIHRydXN0IGl0IHRvCj4gcHJvdmlkZSB0aGUgY29ycmVj dCBQQVNJRCB0b28uIFdoaWNoIGJhc2ljYWxseSBtZWFucyBpbiB0aGUgVkZJTyBjYXNlCj4gd2hl cmUgdGhlIHVzZXIgZ2V0cyAqZnVsbCogY29udHJvbCBvZiB0aGUgZGV2aWNlLCB3ZSBoYXZlIHRv IGVuc3VyZQo+IHRoYXQgaXQgZ2V0cyBpdHMgb3duIFBBU0lEIHRhYmxlIHdpdGggb25seSB0aGUg Km9uZSogUEFTSUQgaW4gaXQsIGFuZAo+ICp0aGF0KiBQQVNJRCBjYW4ndCBoYXZlIHN1cGVydmlz b3IgbW9kZS4KCkV4YWN0bHksIHdlIG5lZWQgdG8gdHJ1c3QgdGhlIGRldmljZSBhbmQgdGhlIGRl dmljZSBkcml2ZXIuIEJ1dCB0aGF0cwpub3QgZGlmZmVyZW50IHRvIGEgc2l0dWF0aW9uIHdpdGhv dXQgYW4gaW9tbXUuIFdlIGp1c3QgcnVuIGludG8gcHJvYmxlbXMKd2hlbiBhIGRldmljZS1kcml2 ZXIgYWxsb3dzIHNlbmRpbmcgcmVxdWVzdHMgdG8gYWNjZXNzIGtlcm5lbC1tZW1vcnkKZnJvbSB1 c2VyLXNwYWNlLCBzbyBpdCBuZWVkcyBtb3JlIGNhcmUgZnJvbSB0aGUgZHJpdmVyIHdyaXRlcnMv cmV2aWV3ZXJzCnRvby4KCj4gK3N0YXRpYyBpbmxpbmUgdm9pZCBkb19pb21tdV9mbHVzaF9rdGxi KHVuc2lnbmVkIGxvbmcgc3RhcnQsIHVuc2lnbmVkIGxvbmcgZW5kKQo+ICt7Cj4gKwlpb21tdV9m bHVzaF9rdGxiX2ZuICpmbjsKPiArCXJjdV9yZWFkX2xvY2soKTsKPiArCWZuID0gcmN1X2RlcmVm ZXJlbmNlKGlvbW11X2ZsdXNoX2t0bGIpOwo+ICsJaWYgKGZuKQo+ICsJCSgqZm4pKHN0YXJ0LCBl bmQpOwo+ICsJcmN1X3JlYWRfdW5sb2NrKCk7Cj4gK30KClllcywgdGhhdCdsbCB3b3JrIHRvby4g V2hlbiB5b3UgcmVhZC91cGRhdGUgdGhlIGlvbW11X2ZsdXNoX2t0bGIgcG9pbnRlcgphdG9taWNh bGx5LCB5b3UgY2FuIGV2ZW4gZ2V0IGF3YXkgd2l0aG91dCByY3UuIFRoZSBmdW5jdGlvbiBpdCBw b2ludHMgdG8Kd2lsbCBub3QgZ28gYXdheSwgc28geW91IGNhbiBzdGlsbCBjYWxsIGl0IGV2ZW4g d2hlbiB0aGUgcG9pbnRlciB0dXJuZWQKTlVMTC4KCj4gTWF5YmUgd2UgY291bGQga2VlcCBpdCBz aW1wbGUgYW5kIGp1c3QgZGVjbGFyZSB0aGF0IG9uY2UgdGhlIGZ1bmN0aW9uCj4gcG9pbnRlciBp cyBzZXQsIGl0IG1heSBuZXZlciBiZSBjbGVhcmVkPyBCdXQgSSB0aGluayB3ZSByZWFsbHkgZG8g d2FudAo+IHRvIGF2b2lkIHRoZSBvdXQtb2YtbGluZSBmdW5jdGlvbiBjYWxsIGFsdG9nZXRoZXIg aW4gdGhlIGNhc2Ugd2hlcmUKPiBrZXJuZWwgUEFTSURzIGFyZSBub3QgYmVpbmcgdXNlZC4gT3Ig YXQgKmxlYXN0KiB0aGUgY2FzZSB3aGVyZSBTVk0KPiBpc24ndCBiZWluZyB1c2VkIGF0IGFsbC4K ClllcywgdGhhdHMgd2h5IEkgdGhpbmsgYW4gaW5saW5lIGZ1bmN0aW9uIHdoaWNoIGRvZXMgdGhl IGNoZWNrcyB3b3VsZCBiZQphIGJldHRlciBzb2x1dGlvbi4gVGhlIG1tdV9ub3RpZmllcnMgaW1w bGVtZW50IGl0IGluIHRoZSBzYW1lIHdheSwgc28gd2UKd291bGQgc3RheSBjb25zaXN0ZW50IHdp dGggdGhlbS4KCgoJSm9lcmcKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fCmlvbW11IG1haWxpbmcgbGlzdAppb21tdUBsaXN0cy5saW51eC1mb3VuZGF0aW9u Lm9yZwpodHRwczovL2xpc3RzLmxpbnV4Zm91bmRhdGlvbi5vcmcvbWFpbG1hbi9saXN0aW5mby9p b21tdQ==