From mboxrd@z Thu Jan 1 00:00:00 1970 From: Boris Ostrovsky Subject: Re: Question about sharing spinlock_t among VMs in Xen Date: Mon, 13 Jun 2016 14:28:41 -0400 Message-ID: <575EFB59.1000202@oracle.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bCWbU-0006Fe-FQ for xen-devel@lists.xenproject.org; Mon, 13 Jun 2016 18:28:52 +0000 In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Meng Xu , "xen-devel@lists.xenproject.org" List-Id: xen-devel@lists.xenproject.org T24gMDYvMTMvMjAxNiAwMTo0MyBQTSwgTWVuZyBYdSB3cm90ZToKPiBIaSwKPgo+IEkgaGF2ZSBh IHF1aWNrIHF1ZXN0aW9uIGFib3V0IHVzaW5nIHRoZSBMaW51eCBzcGluX2xvY2soKSBpbiBYZW4K PiBlbnZpcm9ubWVudCB0byBwcm90ZWN0IHNvbWUgaG9zdC13aWRlIHNoYXJlZCAobWVtb3J5KSBy ZXNvdXJjZSBhbW9uZwo+IFZNcy4KPgo+ICoqKiBUaGUgcXVlc3Rpb24gaXMgYXMgZm9sbG93cyAq KioKPiBTdXBwb3NlIEkgaGF2ZSB0d28gTGludXggVk1zIHNoYXJpbmcgdGhlIHNhbWUgc3Bpbmxv Y2tfdCBsb2NrICh0aHJvdWdoCj4gdGhlIHNoYXJpbmcgbWVtb3J5KSBvbiB0aGUgc2FtZSBob3N0 LiBTdXBwb3NlIHdlIGhhdmUgb25lIHByb2Nlc3MgaW4KPiBlYWNoIFZNLiBFYWNoIHByb2Nlc3Mg dXNlcyB0aGUgbGludXggZnVuY3Rpb24gc3Bpbl9sb2NrKCZsb2NrKSBbMV0gdG8KPiBncmFiICYg cmVsZWFzZSB0aGUgbG9jay4KPiBXaWxsIHRoZXNlIHR3byBwcm9jZXNzZXMgaW4gdGhlIHR3byBW TXMgaGF2ZSByYWNlIG9uIHRoZSBzaGFyZWQgbG9jaz8KCllvdSBjYW4ndCBkbyB0aGlzOiBkZXBl bmRpbmcgb24gd2hpY2ggTGludXggdmVyc2lvbiB5b3UgdXNlIHlvdSB3aWxsCmZpbmQgdGhhdCBr ZXJuZWwgdXNlcyB0aWNrZXRsb2NrcyBvciBxbG9ja3MgbG9ja3Mgd2hpY2gga2VlcCB0cmFjayBv Zgp3aG8gaXMgaG9sZGluZyB0aGUgbG9jayAob2J2aW91c2x5IHRoaXMgaW5mb3JtYXRpb24gaXMg aW50ZXJuYWwgdG8gVk0pLgpPbiB0b3Agb2YgdGhpcyBvbiBYZW4gd2UgdXNlIHB2bG9ja3Mgd2hp Y2ggYWRkIGFub3RoZXIgKGludGVybmFsKQpjb250cm9sIGxheWVyLgoKCj4KPiBNeSBzcGVjdWxh dGlvbiBpcyB0aGF0IGl0IHNob3VsZCBoYXZlIHRoZSByYWNlIG9uIHRoZSBzaGFyZCBsb2NrIHdo ZW4KPiB0aGUgc3Bpbl9sb2NrKCkgZnVuY3Rpb24gaW4gKnR3byBWTXMqIG9wZXJhdGUgb24gdGhl IHNhbWUgbG9jay4KPgo+IFdlIGRpZCBzb21lIHF1aWNrIGV4cGVyaW1lbnQgb24gdGhpcyBhbmQg d2UgZm91bmQgb25lIFZNIHNvbWV0aW1lcyBzZWUKPiB0aGUgc29mdCBsb2NrdXAgb24gdGhlIGxv Y2suIEJ1dCB3ZSB3YW50IHRvIG1ha2Ugc3VyZSBvdXIKPiB1bmRlcnN0YW5kaW5nIGlzIGNvcnJl Y3QuCj4KPiBXZSBhcmUgZXhwbG9yaW5nIGlmIHdlIGNhbiB1c2UgdGhlIHNwaW5fbG9jayB0byBw cm90ZWN0IHRoZSBzaGFyZWQKPiByZXNvdXJjZXMgYW1vbmcgVk1zLCBpbnN0ZWFkIG9mIHVzaW5n IHRoZSBQViBkcml2ZXJzLiBJZiB0aGUKPiBzcGluX2xvY2soKSBpbiBsaW51eCBjYW4gcHJvdmlk ZSB0aGUgaG9zdC13aWRlIGF0b21pY2l0eSAod2hpY2ggd2lsbAo+IHN1cnByaXNlIG1lLCB0aG91 Z2gpLCB0aGF0IHdpbGwgYmUgZ3JlYXQuIE90aGVyd2lzZSwgd2UgcHJvYmFibHkgaGF2ZQo+IHRv IGV4cG9zZSB0aGUgc3Bpbl9sb2NrIGluIFhlbiB0byB0aGUgTGludXg/CgpJJ2QgdGhpbmsgdGhp cyBoYXMgdG8gYmUgdmlhIHRoZSBoeXBlcnZpc29yIChvciBzb21lIG90aGVyIHRoaXJkIHBhcnR5 KS4KT3RoZXJ3aXNlIHdoYXQgaGFwcGVucyBpZiBvbmUgb2YgdGhlIGd1ZXN0cyBkaWVzIHdoaWxl IGhvbGRpbmcgdGhlIGxvY2s/CgotYm9yaXMKCj4KPiBbMV0gaHR0cDovL2x4ci5mcmVlLWVsZWN0 cm9ucy5jb20vc291cmNlL2luY2x1ZGUvbGludXgvc3BpbmxvY2suaCNMMzAwCj4KPiBUaGFuayB5 b3UgdmVyeSBtdWNoIGZvciB5b3VyIHRpbWUgYW5kIGhlbHAgaW4gdGhpcyBxdWVzdGlvbiEKPgo+ IEJlc3QgUmVnYXJkcywKPgo+IE1lbmcKPgo+IC0tLS0tLS0tLS0tCj4gTWVuZyBYdQo+IFBoRCBT dHVkZW50IGluIENvbXB1dGVyIGFuZCBJbmZvcm1hdGlvbiBTY2llbmNlCj4gVW5pdmVyc2l0eSBv ZiBQZW5uc3lsdmFuaWEKPiBodHRwOi8vd3d3LmNpcy51cGVubi5lZHUvfm1lbmd4dS8KPgo+IF9f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCj4gWGVuLWRldmVs IG1haWxpbmcgbGlzdAo+IFhlbi1kZXZlbEBsaXN0cy54ZW4ub3JnCj4gaHR0cDovL2xpc3RzLnhl bi5vcmcveGVuLWRldmVsCgoKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5nIGxpc3QKWGVuLWRldmVsQGxpc3RzLnhlbi5vcmcK aHR0cDovL2xpc3RzLnhlbi5vcmcveGVuLWRldmVsCg==