[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Bisected Xen-unstable: "Segment register inaccessible for d1v0" when starting HVM guest on intel
> -----Original Message----- > From: Jan Beulich [mailto:JBeulich@xxxxxxxx] > Sent: Thursday, July 03, 2014 9:21 PM > To: Wu, Feng > Cc: Andrew Cooper; Sander Eikelenboom; xen-devel@xxxxxxxxxxxxxxxxxxxx > Subject: RE: [Xen-devel] Bisected Xen-unstable: "Segment register inaccessible > for d1v0" when starting HVM guest on intel > > >>> On 03.07.14 at 15:04, <feng.wu@xxxxxxxxx> wrote: > >> From: Jan Beulich [mailto:JBeulich@xxxxxxxx] > >> And as Andrew emphasized, raising a fault in response to a failure > >> here is out of question (the only two options considering this is > >> asynchronous would be #MC or a failsafe callback, neither of which > >> really fit the purpose). Nevertheless it would be rather desirable to > >> have a way to tell the guest about the dropped write. We've got > >> a field in struct arch_vcpu_info that we could leverage for this, > >> requiring the guest to actively poll if it cares about finding out (to > >> avoid the polling this could further be combined with a new > >> per-vCPU vIRQ, or by defining another XEN_NMIREASON_* value > >> and delivering the notification via NMI). > > > > I am not familiar with these related code actually, I try to get some > > findings in the code, but seems no good news. So maybe I have some > > basic questions here: > > 1. What is the purpose of 'struct arch_vcpu_info arch'? > > 2. Do you mean I can use the member 'unsigned long pad' of it to tell > > the guest about the dropped write. > > 3. What information about the dropped write should be sent to guest? > > 4. When guests will poll the information? > > 5. Can vIRQ be used for HVM guest? Is there an existing example in the > > current code? > > With this many questions I don't think there's much point in you doing > the notification part; why don't you just start without notification, > adding of which is an enhancement only anyway? Yes, I think this is a better at the current stage. Will do this soon! Thanks a lot! Thanks, Feng > > Jan > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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