From mboxrd@z Thu Jan 1 00:00:00 1970 From: Julien Grall Subject: Re: Xen ARM - Exposing a PL011 to the guest Date: Fri, 16 Dec 2016 17:03:13 +0000 Message-ID: <7c3a29e7-aea6-5f9c-61b0-b4f82bcafa34@arm.com> References: <86800697-5057-3f14-c19f-151e81315133@arm.com> <20161201102618.GA10384@cbox> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Bhupinder Thakur , Stefano Stabellini Cc: Wei Liu , Steve Capper , George Dunlap , Andrew Cooper , Ian Jackson , Xen Devel , Jan Beulich , Christoffer Dall List-Id: xen-devel@lists.xenproject.org KENDIHJlc3QgbWFpbnRhaW5lcnMgZm9yIGV2ZW50IGNoYW5uZWwgcXVlc3Rpb25zKQoKT24gMTYv MTIvMTYgMTA6MDYsIEJodXBpbmRlciBUaGFrdXIgd3JvdGU6Cj4gSGksCgpIaSBCaHVwaW5kZXIs Cgo+IFRoZSBpZGVhIGlzIGZvciBYZW4gdG8gYWN0IGFzIGFuIGludGVybWVkaWFyeSBhcyBzaG93 biBiZWxvdzoKPgo+ICAgICAgICAgICAgICAgIHJpbmcgYnVmZmVycwo+ICAgICAgICAgICAgICAg ICAgICAgICAgICAgIHJ4L3R4IGZpZm8KPiBkb20wIDwtLS0tLS0tLS0tLS0tLS0tLS0tPiBYZW4g SFlQIChydW5uaW5nIHBsMDExIGVtdWxhdGlvbikKPiA8LS0tLS0tLS0tLS0tLS0tLS0tLT4gZG9t VQo+ICAgICAgICAgICAgICAgICAgICAgZXZlbnQKPiAgICAgICAgICAgICAgICAgICAgICAgICAg ICBpbnRlcnJ1cHRzCj4KPiBYZW4gd2lsbCBkaXJlY3RseSBtYW5hZ2UgdGhlIGluL291dCBjb25z b2xlIHJpbmcgYnVmZmVycyAoYWxsb2NhdGVkIGJ5Cj4gZG9tMCBmb3IgZG9tMC1kb21VIGNvbnNv bGUgY29tbXVuaWNhdGlvbikgZm9yIHJlYWRpbmcvd3JpdGluZyBjb25zb2xlCj4gZGF0YSBmcm9t L3RvIGRvbTAuIE9uIHRoZSBvdGhlciBzaWRlLCBYZW4gSFlQIHdpbGwgZW11bGF0ZSBwbDAxMSB0 bwo+IHJlYWQvd3JpdGUgZGF0YSBmcm9tL3RvIGRvbVUgYW5kIHBhc3MgaXQgb24gdG8vZnJvbSBk b20wIG92ZXIgdGhlCj4gaW4vb3V0IGNvbnNvbGUgcmluZyBidWZmZXJzLiBUaGVyZSBzaG91bGQg YmUgbm8gY2hhbmdlIGluIGRvbTAgYXMgaXQKPiB3aWxsIHN0aWxsIHVzZSB0aGUgc2FtZSByaW5n IGJ1ZmZlcnMuIFNpbWlsYXJseSB0aGVyZSBzaG91bGQgYmUgbm8KPiBjaGFuZ2UgaW4gZG9tVSB3 aGljaCB3b3VsZCBiZSBydW5uaW5nIGEgc3RhbmRhcmQgcGxsMDExIGRyaXZlci4KPgo+IEN1cnJl bnRseSwgSSBhbSB3b3JraW5nIG9uIHRoZSBpbnRlcmZhY2UgYmV0d2VlbiBkb20wIGFuZCBYZW4g SFlQLiBJCj4gd2FudCB0byBpbnRlcmNlcHQgdGhlIGNvbnNvbGUgZXZlbnRzIGluIFhlbiBIWVAg d2hpY2ggcGFzcyBiZXR3ZWVuCj4gZG9tMCBhbmQgZG9tVS4gRm9yIG5vdywgSSBqdXN0IHdhbnQg dG8gY2FwdHVyZSBjb25zb2xlIGRhdGEgY29taW5nCj4gZnJvbSBkb20wIGF0IFhlbiBIWVAgYW5k IGxvb3AgaXQgYmFjayB0byBkb20wLCB0byBjb25maXJtIHRoYXQgdGhpcwo+IGludGVyZmFjZSBp cyB3b3JraW5nLgo+Cj4gU2luY2UgZWFjaCBndWVzdCBkb21haW4gd2lsbCBoYXZlIGEgdW5pcXVl IGV2ZW50IGNoYW5uZWwgYXNzaWduZWQgZm9yCj4gY29uc29sZSBjb21tdW5pY2F0aW9uLCBYZW4g SFlQIGNhbiBmaW5kIG91dCB0aGUgZXZlbnQgY2hhbm5lbCBmb3IgYQo+IGdpdmVuIGRvbVUgZnJv bSB0aGUgc3RhcnRfaW5mbyBwYWdlIG9mIHRoYXQgZG9tVSwgd2hpY2ggc2hvdWxkIGhhdmUKClRo ZSBzdGFydF9pbmZvIHBhZ2UgaXMgeDg2IHNwZWNpZmljLiBJZiB5b3Ugd2FudCB0byBnZXQgdGhl IGNvbnNvbGUgCmV2ZW50IGNoYW5uZWwgZm9yIEFSTSwgeW91IHdvdWxkIGhhdmUgdG8gdXNlIApk LT5hcmNoLmh2bV9kb21haW4ucGFyYW1zW0hWTV9QQVJBTV9DT05TT0xFX0VWVENITl0uCgpUaGlz IHBhcmFtZXRlciB3aWxsIGJlIHNldHVwIGJ5IHRoZSB0b29sc3RhY2sgKHNlZSBhbGxvY19tYWdp Y19wYWdlcyBpbiAKbGlieGMveGNfZG9tX2FybS5jKS4KCj4gYmVlbiBhbGxvY2F0ZWQgYnkgZG9t MC4gV2hlbmV2ZXIsIGFuIGV2ZW50IGlzIHRvIGJlIGRpc3BhdGNoZWQgdmlhCj4gZXZ0Y2huX3Nl bmQoKSBBUEkgaW4gWGVuLCBpdCBjYW4gY2hlY2sgaWYgdGhlIGV2ZW50IGNoYW5uZWwgaXMgdGhl Cj4gY29uc29sZSBldmVudCBjaGFubmVsIGZvciBhIGdpdmVuIGRvbVUuIElmIHllcyBhbmQgaXRz IHNvdXJjZSBkb21haW4KPiBpcyBkb20wIGFuZCBkZXN0aW5hdGlvbiBkb21haW4gaXMgZG9tVSB0 aGVuIGl0IHdpbGwgd3JpdGUgdGhlIGRhdGEKPiBiYWNrIHRvIHRoZSBjb25zb2xlIG91dCByaW5n IGJ1ZmZlciBvZiB0aGUgZG9tVSBhbmQgcmFpc2UgYSBjb25zb2xlCj4gZXZlbnQgdG8gZG9tMC4K Pgo+IE9uY2UgdGhpcyBpbnRlcmZhY2UgaXMgd29ya2luZywgWGVuIEhZUCBjYW4gY2hlY2sgdGhl IHNvdXJjZSBhbmQKPiBkZXN0aW5hdGlvbiBkb20gaWRzIGFuZCBkZWNpZGUgd2hpY2ggd2F5IHRo ZSBldmVudCBjYW1lIGZyb20gYW5kCj4gYWNjb3JkaW5nbHkgcHJvY2VzcyB0aGUgY29uc29sZSBk YXRhLiBUbyBhbGxvdyBhIG1peCBvZiBQViBjb25zb2xlCj4gZ3Vlc3RzIGFuZCBwbDAxMSBndWVz dHMsIFhlbiBtaWdodCBoYXZlIHRvIG1haW50YWluIGEgZmxhZyBwZXIgZG9tYWluLAo+IHdoaWNo IHRlbGxzIHdoZXRoZXIgWGVuIEhZUCBzaG91bGQgaW50ZXJjZXB0IGFuZCBwcm9jZXNzIHRoZSBk YXRhIChmb3IKPiBwbDAxMSBVQVJUIGNhc2UpIG9yIGxldCBpdCBnbyB0cmFuc3BhcmVudGx5IChm b3IgUFYgY29ub3NsZSBjYXNlKS4KCkkgYW0gbm90IHZlcnkgZmFtaWxpYXIgd2l0aCB0aGUgZXZl bnQgY2hhbm5lbCBjb2RlLiBJIHdpbGwgbGV0IHRoZSAKb3RoZXJzIGNvbW1lbnQgb24gdGhpcyBi aXQuCgpSZWdhcmRsZXNzIHRoYXQsIGhvdyB3b3VsZCB5b3UgZGVjaWRlIHdoZXRoZXIgdGhlIGh5 cGVydmlzb3Igc2hvdWxkIAppbnRlcmNlcHQgdGhlIG5vdGlmaWNhdGlvbj8KCkkgY2FuIHNlZSAy IGRpZmZlcmVudCBjYXNlczoKCTEpIFRoZSBndWVzdCBpcyBzdGFydGluZyB0byB1c2UgdGhlIHBs MDExIHRoZW4gbW92ZSB0byB0aGUgSFZDIGNvbnNvbGUgCihvciBIVkMgdGhlbiBwbDAxMSkKCTIp IFRoZSBndWVzdCBpcyB1c2luZyBib3RoIHRoZSBQTDAxMSBhbmQgdGhlIEhWQyBjb25zb2xlCgpT aG91bGQgd2UgY29uc2lkZXIgdGhlIHNlY29uZCBjYXNlIHZhbGlkPyBJIHdvdWxkIHNheSB5ZXMs IGJlY2F1c2UgYSAKdXNlciBjb3VsZCBzcGVjaWZ5IGJvdGggb24gdGhlIGNvbW1hbmQgbGluZS4g SWYgd2UgdXNlIHRoZSBzYW1lIHJpbmcsIAp0aGUgb3V0cHV0IHdvdWxkIGJlIGEgdG90YWwgZ2Fy YmFnZS4KClNvIG1heWJlIHdlIG5lZWQgdG8gYWxsb2NhdGUgdHdvIGRpc3RpbmN0IHJpbmdzIGFu ZCBldmVudCBjaGFubmVsPwoKRm9yIHlvdXIgdGVzdGluZywgeW91IGNvdWxkIGNvbnNpZGVyIHRo YXQgdGhlIHJpbmcgaXMgb25seSB1c2VkIGJ5IHRoZSAKcGwwMTEuIEkgd291bGQgcmVjb21tZW5k IHlvdSB0byBkaXNhYmxlIHRoZSBIVkMgY29uc29sZSBkcml2ZXIgaW4gdGhlIApndWVzdCAoc2Vl IENPTkZJR19IVkNfWEVOKS4KCkkgbG9va2VkIGF0IHRoZSBldmVudCBjaGFubmVsIGNvZGUgYW5k IEkgY2FuIG9ubHkgZmluZCBhIGZ1bmN0aW9uIGZvciAKeGVuIHRvIGNyZWF0ZSBhbiBldmVudCBj aGFubmVsIChzZWUgYWxsb2NfdW5ib3VuZF94ZW5fZXZlbnRfY2hhbm5lbCkuIApCdXQgaW4geW91 ciBjYXNlLCB5b3Ugd2FudCBhIGZ1bmN0aW9uIHRvIGJpbmQgYW4gZXZlbnQgY2hhbm5lbC4KCj4K PiBJcyB0aGlzIHRoZSBjb3JyZWN0IHdheSB0byBmaW5kIG91dCB0aGUgY29uc29sZSBldmVudCBj aGFubmVsIGZvciBhCj4gZ2l2ZW4gZG9tVSBvciB0aGVyZSBpcyBzb21lIG90aGVyIHdheT8gSSBj b3VsZCBub3QgbG9jYXRlIGluIHRoZSBYZW4KPiBzb3VyY2UgY29kZSwgd2hlcmUgZXhhY3RseSB0 aGUgc3RhcnRfaW5mbyBwYWdlIGlzIGNyZWF0ZWQgZm9yIGEgbmV3Cj4gZG9tYWluLCB3aGljaCB3 b3VsZCBjb250YWluIHRoZSBjb25zb2xlIGV2ZW50IGNoYW5uZWwgYW5kIGFuZCBtYWNoaW5lCj4g cGFnZSB3aGVyZSB0aGUgcmluZyBidWZmZXJzIGFyZSBtYXBwZWQuCgpZb3UgY2FuIGdpdmUgYSBs b29rIHRvIEhWTV9QQVJBTV9DT05TT0xFX0VWVENITiBhbmQgCkhWTV9QQVJBTV9DT05TT0xFX1BG TiAoc2VlIG1vcmUgZGV0YWlscyBhYm92ZSkuCgpDaGVlcnMsCgotLSAKSnVsaWVuIEdyYWxsCgpf X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpYZW4tZGV2ZWwg bWFpbGluZyBsaXN0Clhlbi1kZXZlbEBsaXN0cy54ZW4ub3JnCmh0dHBzOi8vbGlzdHMueGVuLm9y Zy94ZW4tZGV2ZWwK