From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Cooper Subject: Re: Question about sharing spinlock_t among VMs in Xen Date: Mon, 13 Jun 2016 23:54:47 +0100 Message-ID: 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 1bCakt-0002dj-5l for xen-devel@lists.xenproject.org; Mon, 13 Jun 2016 22:54:51 +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 T24gMTMvMDYvMjAxNiAxODo0MywgTWVuZyBYdSB3cm90ZToKPiBIaSwKPgo+IEkgaGF2ZSBhIHF1 aWNrIHF1ZXN0aW9uIGFib3V0IHVzaW5nIHRoZSBMaW51eCBzcGluX2xvY2soKSBpbiBYZW4KPiBl bnZpcm9ubWVudCB0byBwcm90ZWN0IHNvbWUgaG9zdC13aWRlIHNoYXJlZCAobWVtb3J5KSByZXNv dXJjZSBhbW9uZwo+IFZNcy4KPgo+ICoqKiBUaGUgcXVlc3Rpb24gaXMgYXMgZm9sbG93cyAqKioK PiBTdXBwb3NlIEkgaGF2ZSB0d28gTGludXggVk1zIHNoYXJpbmcgdGhlIHNhbWUgc3BpbmxvY2tf dCBsb2NrICh0aHJvdWdoCj4gdGhlIHNoYXJpbmcgbWVtb3J5KSBvbiB0aGUgc2FtZSBob3N0LiBT dXBwb3NlIHdlIGhhdmUgb25lIHByb2Nlc3MgaW4KPiBlYWNoIFZNLiBFYWNoIHByb2Nlc3MgdXNl cyB0aGUgbGludXggZnVuY3Rpb24gc3Bpbl9sb2NrKCZsb2NrKSBbMV0gdG8KPiBncmFiICYgcmVs ZWFzZSB0aGUgbG9jay4KPiBXaWxsIHRoZXNlIHR3byBwcm9jZXNzZXMgaW4gdGhlIHR3byBWTXMg aGF2ZSByYWNlIG9uIHRoZSBzaGFyZWQgbG9jaz8KCiJSYWNlIiBpcyBkZWJhdGFibGUuICAoQWZ0 ZXIgYWxsLCB0aGUgcG9pbnQgb2YgYSBsb2NrIGlzIHRvIGhhdmUKc2VyaWFsaXNlIG11bHRpcGxl IGFjY2Vzc29ycykuICBCdXQgeWVzLCB0aGlzIHdpbGwgYmUgdGhlIHNhbWUgbG9jay4KClRoZSB1 bmRlcmx5aW5nIGNhY2hlIGNvaGVyZW5jeSBmYWJyaWMgd2lsbCBwZXJmb3JtIGF0b21pYyBsb2Nr ZWQKb3BlcmF0aW9ucyBvbiB0aGUgc2FtZSBwaHlzaWNhbCBwaWVjZSBvZiBSQU0uCgpUaGUgaW1w b3J0YW50IHF1ZXN0aW9uIGlzIHdoZXRoZXIgdGhlIHR3byBkaWZmZXJlbmNlIFZNcyBoYXZlIGFu CmlkZW50aWNhbCBpZGVhIG9mIHdoYXQgYSBzcGlubG9ja190IGlzLiAgSWYgbm90LCB0aGlzIHdp bGwgZGVmaW5pdGVseSBmYWlsLgoKPiBNeSBzcGVjdWxhdGlvbiBpcyB0aGF0IGl0IHNob3VsZCBo YXZlIHRoZSByYWNlIG9uIHRoZSBzaGFyZCBsb2NrIHdoZW4KPiB0aGUgc3Bpbl9sb2NrKCkgZnVu Y3Rpb24gaW4gKnR3byBWTXMqIG9wZXJhdGUgb24gdGhlIHNhbWUgbG9jay4KPgo+IFdlIGRpZCBz b21lIHF1aWNrIGV4cGVyaW1lbnQgb24gdGhpcyBhbmQgd2UgZm91bmQgb25lIFZNIHNvbWV0aW1l cyBzZWUKPiB0aGUgc29mdCBsb2NrdXAgb24gdGhlIGxvY2suIEJ1dCB3ZSB3YW50IHRvIG1ha2Ug c3VyZSBvdXIKPiB1bmRlcnN0YW5kaW5nIGlzIGNvcnJlY3QuCj4KPiBXZSBhcmUgZXhwbG9yaW5n IGlmIHdlIGNhbiB1c2UgdGhlIHNwaW5fbG9jayB0byBwcm90ZWN0IHRoZSBzaGFyZWQKPiByZXNv dXJjZXMgYW1vbmcgVk1zLCBpbnN0ZWFkIG9mIHVzaW5nIHRoZSBQViBkcml2ZXJzLiBJZiB0aGUK PiBzcGluX2xvY2soKSBpbiBsaW51eCBjYW4gcHJvdmlkZSB0aGUgaG9zdC13aWRlIGF0b21pY2l0 eSAod2hpY2ggd2lsbAo+IHN1cnByaXNlIG1lLCB0aG91Z2gpLCB0aGF0IHdpbGwgYmUgZ3JlYXQu IE90aGVyd2lzZSwgd2UgcHJvYmFibHkgaGF2ZQo+IHRvIGV4cG9zZSB0aGUgc3Bpbl9sb2NrIGlu IFhlbiB0byB0aGUgTGludXg/CgpXaGF0IGFyZSB5b3UgYXR0ZW1wdGluZyB0byBwcm90ZWN0IGxp a2UgdGhpcz8KCkFueXRoaW5nIHdoaWNoIGEgZ3Vlc3QgY2FuIHNwaW4gb24gbGlrZSB0aGlzIGlz IGEgcmVjaXBlIGZvciBkaXNhc3RlciwKYXMgeW91IG9ic2VydmUsIGFzIHRoZSBndWVzdCB3aGlj aCBob2xkcyB0aGUgbG9jayB3aWxsIGdldCBzY2hlZHVsZWQgb3V0CmluIGZhdm91ciBvZiB0aGUg Z3Vlc3QgYXR0ZW1wdGluZyB0byB0YWtlIHRoZSBsb2NrLiAgQWx0ZXJuYXRpdmVseSwgdHdvCmRp ZmZlcmVudCBndWVzdHMgd2l0aCBhIGRpZmZlcmVudCBpZGVhIG9mIGhvdyB0byBtYW5hZ2UgdGhl IG1lbW9yeQpiYWNraW5nIGEgc3BpbmxvY2tfdC4KCn5BbmRyZXcKCl9fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5nIGxpc3QKWGVu LWRldmVsQGxpc3RzLnhlbi5vcmcKaHR0cDovL2xpc3RzLnhlbi5vcmcveGVuLWRldmVsCg==