RE: [Xen-ia64-devel] Catch up for PV_on_HVM (cont..)

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

Hi Tsunehisa,

Sorry for very late response,

I noticed that you use do_yield instead of do_block in xen-event.patch.

I think do_yield will incur some unnecessary schedule before it can resume to 
Guest.

And if there are only VTI-domain and IDLE-domain running on one LP,
VTI-domain calling do_yield will not be scheduled out, 
Then pal_halt_light will not be called on this LP,
On HT(hyperthread) platform, this make another LP on the same core scheduled 
less.


Thanks,
Anthony


>-----Original Message-----
>From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
>[mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of DOI
>Tsunehisa
>Sent: 2006年8月22日 15:46
>To: xen-ia64-devel
>Subject: [Xen-ia64-devel] Catch up for PV_on_HVM (cont..)
>
>Hi all,
>
>  I will post patches for catching up the remain features for PV-on-HVM.
>
>>  * need to catchup for IPF
>>    + 02.ioemu_xen_evtchns.diff:    applied (cs:10974-10976) *not yet*
>>      - Flip the device model over to using the new Xen event channels
>>    + 04.hvm_inter.diff:            applied (cs:11057)
>>      - Add support for sending event channel interrupts to HVM guests.
>>    + 10.hvm_op_hypercall.diff:     applied (cs:11079)
>>      - Add stubs to Linux for the new hvm_op hypercall.
>>    + 12.add_maddr_h.diff:          applied (cs:11081)       *not yet*
>>      - Split useful bits of page.h into new header maddr.h.
>>    + **hvm_op fixup**:             applied (cs:11070)
>>      - HVMOP_get_param return parameter value within the provided
>>        parameter struct
>
>  I had posted several patches for these features, a few days ago.
>
>>  * catch up `hvm_op fixup'
>>    - This patch modifies HYPERVISOR_hvm_op().
>>  * catch up `hvm_inter'
>>    - This patch adds support for sending event channel interrupts
>>      to VT-i guests.
>>  * catch up `hvm_op_hypercall'
>>    - This patch includes HYPERVISOR_hvm_op() stabs for linux.
>
>  This patch includes:
>
>  * catch up `split maddr.h'
>    - Split page.h into maddr.h
>    - This patch is like Alex's patch, but it includes preparation
>      for PV-on-HVM.
>  * catch up `new Xen event channles'
>   - DM over to using the new Xen event channel for IPF
>   - Modify xc_ia64_hvm_build for using the new Xen event channel
>   - We can't use wait_on_xen_event_channel() macro as x86 code.
>     Because IPF code is different with x86 code about MMIO
>     emulation. In x86 code, it waits for MMIO completion
>     at scheduler tail code. The purpose of the code is enabling
>     interupt handling during MMIO intercepts. But, in IPF code,
>     it's different.
>   - We will want to modify IPF code like x86 code in the future.
>
>Thanks,
>- Tsunehisa Doi

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