[Xen-devel] xen-4.7

[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

When I try to save a PV guest with 4G of memory using xen-4.7 I get the
following error:

II: Guest memory 4096 MB
II: Saving guest state to file...
Saving to /tmp/pvguest.save new xl format (info 0x3/0x0/1131)
xc: info: Saving domain 23, type x86 PV
xc: error: Bad mfn in p2m_frame_list[0]: Internal error
xc: error: mfn 0x4eb1c8, max 0x820000: Internal error
xc: error:   m2p[0x4eb1c8] = 0xff7c8, max_pfn 0xbffff: Internal error
xc: error: Save failed (34 = Numerical result out of range): Internal error
libxl: error: libxl_stream_write.c:355:libxl__xc_domain_save_done: saving
domain: domain did not respond to suspend request: Numerical result out of range
Failed to save domain, resuming domain
xc: error: Dom 23 not suspended: (shutdown 0, reason 255): Internal error
libxl: error: libxl_dom_suspend.c:460:libxl__domain_resume: xc_domain_resume
failed for domain 23: Invalid argument
EE: Guest not off after save!
FAIL

From dmesg inside the guest:
[    0.000000] e820: last_pfn = 0x100000 max_arch_pfn = 0x400000000

Somehow I am slightly suspicious about

commit 91e204d37f44913913776d0a89279721694f8b32
  libxc: try to find last used pfn when migrating

since that seems to potentially lower ctx->x86_pv.max_pfn which is checked
against in mfn_in_pseudophysmap(). Is that a known problem?
With xen-4.6 and the same dom0/guest kernel version combination this does work.

-Stefan

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