Re: [Xen-devel] [PATCH v2 for-4.9] x86/mm: Fix incorrect unmapping of 2MB and 1GB pages

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.05.17 at 15:00, <boris.ostrovsky@xxxxxxxxxx> wrote:
> (d1) Testing HVM environment:
> (XEN) d1v0 Triple fault - invoking HVM shutdown action 1
> (XEN) *** Dumping Dom1 vcpu#0 state: ***
> (XEN) ----[ Xen-4.9-rc  x86_64  debug=y   Tainted:  C   ]----
> (XEN) CPU:    11
> (XEN) RIP:    0018:[<000000000010815c>]
> (XEN) RFLAGS: 0000000000000086   CONTEXT: hvm guest (d1v0)
> (XEN) rax: 0000000080000011   rbx: 000000000017c000   rcx: 0000000000003000
> (XEN) rdx: 00000000ffefffff   rsi: 0000000000000000   rdi: 0000000000000000
> (XEN) rbp: 0000000000136478   rsp: 0000000000136478   r8:  0000000000000000
> (XEN) r9:  0000000000000000   r10: 0000000000000000   r11: 0000000000000000
> (XEN) r12: 0000000000000000   r13: 0000000000000000   r14: 0000000000000000
> (XEN) r15: 0000000000000000   cr0: 0000000080000011   cr4: 0000000000000000
> (XEN) cr3: 0000000000800000   cr2: 000000000010815c
> (XEN) ds: 0020   es: 0020   fs: 0020   gs: 0020   ss: 0020   cs: 0018
> 
> 
> 0x10815c is tools/firmware/hvmloader/tests.c:start_paging(), the 'jmp'
> after we enable paging (load cr0 with bit 31 set).

Odd. Suggests page tables are completely screwed.

> root@ovs101> xl create -c ~/virt/pvh.conf
> Parsing config from /root/virt/pvh.conf
> libxl: notice: libxl_numa.c:518:libxl__get_numa_candidate: NUMA
> placement failed, performance might be affected
> S3 disabled
> S4 disabled
> CONV disabled
> xc: error: panic: xc_dom_boot.c:178: xc_dom_boot_domU_map: failed to
> mmap domU pages 0x1000+0x1062 [mmap, errno=22 (Invalid argument)]:
> Internal error

This is even more strange. I can't seem to make a connection to
the changes in said commit at all. And I did go through p2m-pt.c's
relevant code another time this morning, without spotting any
possible oversight by Igor. IOW I'm now really curious what it is
that I'm not seeing (and that's apparently NPT-specific).

Jan


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