From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Vrabel Subject: Re: Zero-sized reads from XenBus block Date: Thu, 3 Mar 2016 17:03:30 +0000 Message-ID: <56D86E62.50101@citrix.com> References: <20160302161331.GB23172@citrix.com> <56D7166D.9080203@citrix.com> <56D71F79.5090106@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <56D71F79.5090106@oracle.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Boris Ostrovsky , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Wei Liu , Sergei Lebedev Cc: David Vrabel , xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org T24gMDIvMDMvMTYgMTc6MTQsIEJvcmlzIE9zdHJvdnNreSB3cm90ZToKPiBPbiAwMy8wMi8yMDE2 IDExOjM1IEFNLCBSb2dlciBQYXUgTW9ubsOpIHdyb3RlOgo+PiBFbCAyLzMvMTYgYSBsZXMgMTc6 MTMsIFdlaSBMaXUgaGEgZXNjcml0Ogo+Pj4gQ0MgTGludXgga2VybmVsIGFuZCBGcmVlQlNEIG1h aW50YWluZXJzLgo+Pj4KPj4+IE9uIFdlZCwgTWFyIDAyLCAyMDE2IGF0IDEyOjI5OjI2QU0gKzAz MDAsIFNlcmdlaSBMZWJlZGV2IHdyb3RlOgo+Pj4+IEhpIGxpc3QsCj4+Pj4KPj4+PiBJ4oCZbSBu b3Qgc3VyZSBpZiB0aGlzIGlzIHRoZSBleHBlY3RlZCBiZWhhdmlvdXIsIGJ1dCBpdCBzZWVtcwo+ Pj4+IHplcm8tc2l6ZWQgcmVhZHMgZnJvbSAvZGV2L3hlbi94ZW5idXMgYmxvY2suIEhlcmXigJlz IHNhbXBsZSBjb2RlIGluCj4+Pj4gUHl0aG9uCj4+Pj4KPj4+PiAgICAgIGltcG9ydCBvcwo+Pj4+ ICAgICAgICAgICBmZCA9IG9zLm9wZW4oIi9kZXYveGVuL3hlbmJ1cyIsIG9zLk9fUkRXUikKPj4+ PiAgICAgIG9zLnJlYWQoZmQsIDApICAjIEJsb2Nrcy4KPj4+Pgo+Pj4+IFRoZSBpc3N1ZSBpcyBu b3QgbGFuZ3VhZ2Utc3BlY2lmaWMsIHNpbWlsYXIgY29kZSBpbiBDIGJsb2NrcyBhcyB3ZWxsLgo+ PiBJJ3ZlIHRlc3RlZCB5b3VyIGNvZGUgb24gRnJlZUJTRCAoYWZ0ZXIgcmVwbGFjaW5nIC9kZXYv eGVuL3hlbmJ1cyB3aXRoCj4+IC9kZXYveGVuL3hlbnN0b3JlKSwgYW5kIGl0IGRvZXNuJ3QgYmxv Y2sgdGhlcmUuIEFGQUlDVCB0aGlzIGlzIGJlY2F1c2UKPj4gMC1zaXplIHJlYWRzIG5ldmVyIGdl dCB0byB0aGUgZGV2aWNlICJyZWFkIiByb3V0aW5lIG9uIEZyZWVCU0QsIG9yIGVsc2UKPj4gaXQg d291bGQgYmxvY2suCj4gCj4gVGhpcyBpcyBob3cgeGVuYnVzIGRyaXZlciBpcyBkZXNpZ25lZCAt LS0gaXQgYWx3YXlzIGJsb2NrcyB1bnRpbAo+IHNvbWV0aGluZyBpcyB3cml0dGVuIHRoZXJlLgoK SSdtIG5vdCBzdXJlIEknZCBzYXkgdGhhdCBpdCB3YXMgZGVzaWduZWQgdGhhdCB3YXksIGJ1dCBp dCdzIHRoZSB3YXkgaXQgaXMuCgo+IEl0IHNob3VsZCBpbmRlZWQgcmV0dXJuIHplcm8gcmlnaHQg YXdheSBidXQgSSB3b25kZXIgd2hldGhlciBzb21lb25lCj4gbWlnaHQgY291bnQgb24gY3VycmVu dCBpbXBsZW1lbnRhdGlvbiAoaW4gdGhlIHRvb2xzdGFjayBvciBlbHNld2hlcmUpLgo+IEJhc2Vk IG9uIEZyZWVCU0QgYmVoYXZpb3IgSSdkIHRoaW5rIHRoaXMgc2hvdWxkbid0IGJlIHRoZSBjYXNl LgoKUE9TSVggc2F5czoKCiJCZWZvcmUgYW55IGFjdGlvbiBkZXNjcmliZWQgYmVsb3cgaXMgdGFr ZW4sIGFuZCBpZiBuYnl0ZSBpcyB6ZXJvLCB0aGUKcmVhZCgpIGZ1bmN0aW9uIG1heSBkZXRlY3Qg YW5kIHJldHVybiBlcnJvcnMgYXMgZGVzY3JpYmVkIGJlbG93LiBJbiB0aGUKYWJzZW5jZSBvZiBl cnJvcnMsIG9yIGlmIGVycm9yIGRldGVjdGlvbiBpcyBub3QgcGVyZm9ybWVkLCB0aGUgcmVhZCgp CmZ1bmN0aW9uIHNoYWxsIHJldHVybiB6ZXJvIGFuZCBoYXZlIG5vIG90aGVyIHJlc3VsdHMiCgp4 ZW5idXNfZmlsZV9yZWFkKCkgc2hvdWxkIGJlIGZpeGVkIHRvIGhhbmRsZSB6ZXJvLWxlbmd0aCBy ZWFkcyBjb3JyZWN0bHkuCgpCdXQgc2luY2UgdGhlIHNlbWFudGljcyBvZiBhIHplcm8gbGVuZ3Ro IHJlYWQgYXJlIHdvb2xseSAoaXQgL21heS8gY2hlY2sKZm9yIGVycm9ycyksIEkgd291bGQgc3Vn Z2VzdCBubyBhcHBsaWNhdGlvbiBzaG91bGQgZG8gdGhpcyBhbmQgYXMgc3VjaApmaXhpbmcgdGhp cyBkb2Vzbid0IG5lZWQgdG8gYmUgYSBoaWdoIHByaW9yaXR5LgoKRGF2aWQKCl9fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5nIGxp c3QKWGVuLWRldmVsQGxpc3RzLnhlbi5vcmcKaHR0cDovL2xpc3RzLnhlbi5vcmcveGVuLWRldmVs Cg==