On Mon, Oct 20, 2008 at 05:46:35PM +0800, Yang, Sheng wrote: > On Monday 20 October 2008 16:49:11 Jan Kiszka wrote: > > Hi Sheng, > > > > obviously, I meditated too long over the APIC specs and VAPIC code of > > KVM: When the guest resets the soft-enable bit in SVR, the in-kernel > > APIC implementation also set the LVT masked bits - so far, so fine > > (according to specs). But I failed to read out of that doc if those mask > > bits are permanently set (until the guest clears them again) or only > > until the soft-disabling ends (ie. they are restored to their previous > > state - QEMU goes this way). Can you clarify? > > > > Thanks, > > Jan > > > Hi Jan > > I also can't find related info in the spec. But I think, when software enable > bit is cleaned, the spec said the mask bits are set, which means the content > of register is changed. And no words for what happen if set software enable > bit, so I think it maybe retain the mask state after software enable (a > little more possibility). > > I will give a update if I got more infos.
Find some info: SDM 3A 8.5.1 Local Vector Table Mask: [...] This flag would remain set until software clears it. I think this can explain it. If you got some interesting circumstance, please share with us. :) -- regards Yang, Sheng -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
