[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] [PATCh][VT] do_block upon hlt instruction
Keir Fraser wrote: > On 21 Sep 2005, at 17:39, Nakajima, Jun wrote: > >> At the same time, it disables the monitor/mwait >> feature as it's not feasible to implement for vcpu. > > Why is that? > > -- Keir The major usage model of MONITOR/MWAIT is, the MONITOR instruction specifies the address to watch, and MWAIT waits for any modification to that address: - The current VMX does not support VMExit upon the MONITOR instrucion, so we don't know which address the guest wants to minitor. - even if it did, it's not efficient to check if modification is made to that address range in shadow (so that we can unblock the guest from MWAIT). Jun --- Intel Open Source Technology Center _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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