[Xen-ia64-devel] [PATCH 0/23] [RFC] VTi domain save/restore

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

Hi all.
I've been working on IA64 HVM domain save/restore.
Although it isn't completed yet, I'm posting for review/comment.
Please note that I tested the patches only with Linux which is idle
at this moment.

The main patches are 16, 21, 23.
The patch 17-19 should be sent to xen-devel. I'll send them unless there
are comments/objections.
The patch 14 is for consistency.
The patch 1-10 are random bug fixes/clean ups which aren't necessary
related to HVM domain save/restore.


Tristan.
Could you elaborate on struct vcpu_guest_context_regs rbs_nat, rbs_rnat?
The comment above them is somewhat vague.
I heavily rewrote the rbs related part of getting/setting vcpu context.
I'm not sure about them and I used only rbs_rnat.

I haven't forgotten hvm domain dump-core fix. I need to implement
HVM vcpu context save before fixing it.


Issues:
- VTi break fault handler
  The patch 14 is for consistent VTi cpu context save. 
  Although I don't see any reason why pUStk/pKStk are set
  by VTi break fault handler, please review.
  And people want to test it more before commit.

- RSE (both PV and HVM domain)
  The number of physical stacked general register(RSE.N_STACKED_PHYS)  
  isn't virtualized. Guest OS utilizes it via PAL_RSE_INFO call.
  If the number of cpu where domain is saved/restored aren't same,
  what should be supposed to do?
  The SDM says only that the number is cpu implementation specific.
  So the easiest way is to refuse restore.
  Any thoughts/comments?
  
- Guest OS specific optimization. (both PV and HVM domain)
  Xen/IA64 supports guest OS optimization and PV guest kernel or
  GFW of HVM domain call opt_feature hypercall.
  However the optimization information is lost between save/restore.
  It should also be saved/restored.

  struct opt_feature seems stable for save/restore ABI.
  Or does someone else want to play with opt_feature hypercall?

- Timers of virtual devices
  The current virtual device implementation in xen (vacpi, viosapic...)
  uses the xen internal timer. However they aren't stopped/restarted when
  guest domain pause/unpause. Something should be done here.
  It isn't ia64 specific, x86 seems to have same issue.

- BUFFER PIO (HVM domain specific)
  This isn't addressed yet. I'm going to attack it.

    
[PATCH  1/23] remove duplicate xc_get/set_hvm_param() definitions
[PATCH  2/23] minor clean up of sync_vcpu_execstate()
[PATCH  3/23] avoid set cr.ivt when context switch if possible
[PATCH  4/23] remove dead code
[PATCH  5/23] clean up: vmx_vcpu_set_rr()
[PATCH  6/23] fix vmx_emul_mov_from_dbr/ibr()
[PATCH  7/23] make vmx_setup_platfrom() return error.
[PATCH  8/23] clean up of ia64 hvm builder
[PATCH  9/23] minor clean up of hypervisor.h
[PATCH 10/23] xencomm: add resumedomain support.
[PATCH 11/23] vti domain save/restore: add show_stack() prototype
[PATCH 12/23] vti domain save/restore: fix stack unwinder
[PATCH 13/23] vti domain save/restore: add unwind directive to break fault 
handler
[PATCH 14/23] [RFC] vti domain save/restore: clean up vti break fault handler
[PATCH 15/23] vti domain save/restore: make vmx_vcpu_set_rr() accept non-current
[PATCH 16/23] [RFC] vti domain save/restore: implement 
arch_get/set_info_guest() more
[PATCH 17/23] vti domain save/restore: split hvm/support.h into arch 
generic/dependent part
[PATCH 18/23] vti domain save/restore: split save.h into arch generic/dependent 
part
[PATCH 19/23] vti domain save/restore: split save.c into arch generic/dependent 
part
[PATCH 20/23] vti domain save/restore: linux xencomm; add hvm_set/get_context 
support
[PATCH 21/23] [RFC] vti domain save/restore:  implement hvm_save/load. work in 
progress.
[PATCH 22/23] vti domain save/restore: libxc: add support set/get_hvmcontext 
support
[PATCH 23/23] [RFC] vti domain save/restore: libxc: implement vti domain 
save/restore

thanks,

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