[Xen-devel] Current staging crashes on boot on an AMD EPYC 7251

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

Hello,

While doing my best to make sure what I understand to be George's
proposed changes for the altp2m series I've tried to boot Xen staging on
an AMD host, but it crashes in an unrelated place (I've tested this by
stashing my changes and booting a "vanilla" staging):

(XEN) Dom0 has maximum 16 VCPUs
(XEN) ELF: phdr 0 at 0xffffffff81000000 -> 0xffffffff81de9000
(XEN) ELF: phdr 1 at 0xffffffff81e00000 -> 0xffffffff81f4a000
(XEN) ELF: phdr 2 at 0xffffffff81f4a000 -> 0xffffffff81f624d8
(XEN) ELF: phdr 3 at 0xffffffff81f63000 -> 0xffffffff820ce000
(XEN) setup 0000:00:00.2 for d0 failed (-19)
(XEN) setup 0000:20:00.2 for d0 failed (-19)
(XEN) setup 0000:40:00.2 for d0 failed (-19)
(XEN) setup 0000:60:00.2 for d0 failed (-19)
(XEN) Assertion 'unreachable' failed at mm.c:468
(XEN) ----[ Xen-4.12-unstable  x86_64  debug=y   Not tainted ]----
(XEN) CPU:    0
(XEN) RIP:    e008:[<ffff82d080289024>] page_get_ram_type+0x9a/0xbb
(XEN) RFLAGS: 0000000000010216   CONTEXT: hypervisor
(XEN) rax: 0000000000000000   rbx: 00000000000dabf2   rcx: 00000000dabf2000
(XEN) rdx: ffff82d0805a3b60   rsi: ffff82d0805a3b60   rdi: 00000000dabf2000
(XEN) rbp: ffff82d080487858   rsp: ffff82d080487858   r8:  00000000dabf3000
(XEN) r9:  ffff82d0805a3d90   r10: 00000000dacdf000   r11: ffff82d080391a54
(XEN) r12: 00000000000dabf2   r13: ffff8303fb341000   r14: 0000000000c1f200
(XEN) r15: 000ffffffffff000   cr0: 000000008005003b   cr4: 00000000001506e0
(XEN) cr3: 00000000dbe7b000   cr2: 0000000000000000
(XEN) fsb: 0000000000000000   gsb: 0000000000000000   gss: 0000000000000000
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: 0000   cs: e008
(XEN) Xen code around <ffff82d080289024> (page_get_ram_type+0x9a/0xbb):
(XEN)  04 eb 07 83 c8 08 eb 02 <0f> 0b 48 03 0e 48 83 c2 14 4c 39 ca 75
a0 85 c0
(XEN) Xen stack trace from rsp=ffff82d080487858:
(XEN)    ffff82d080487898 ffff82d08040d57c ffff82d080487898 ffff8300d9bfa000
(XEN)    ffff8303fb341000 000000000017e1b8 0000000000177000 ffff8303fb341000
(XEN)    ffff82d0804878d8 ffff82d08040753c ffff82d0804878d8 ffff8300d9bfa000
(XEN)    00000000000071b8 000000000017e1b8 0000000000177000 ffff8303fb341000
(XEN)    ffff82d080487d68 ffff82d080428c04 ffff82d080487ad8 ffff830000097ed0
(XEN)    ffffffff82400000 0000000000000015 0000000000000ff0 0000000000000000
(XEN)    00000003f6241000 ffff8303f6240000 ffffffff8223e000 ffff8303f6241000
(XEN)    0000000000000000 ffff8303f6242ff8 00000003f6253000 00000000000065fe
(XEN)    ffff8303f6242000 ffffffff82255000 ffffffff81000000 00000000003f8000
(XEN)    ffffffff8223e000 00000003f6254000 ffff8303f6241090 00000000003f4000
(XEN)    ffffffff8223e000 00000000000025fe 0000000000002400 ffff830000097ed0
(XEN)    0000008000bb8000 00000000000065fe ffff820040000000 0000008000000000
(XEN)    00000000000065fe 0000000000177000 0000000000000000 00000000000071b9
(XEN)    0000000000004000 ffff82d08045a7c0 ffff8300d9bfa000 00000000025fdbda
(XEN)    0000000000000000 ffff830c1b97be64 ffff830c1b97c068 0000000000000000
(XEN)    0000000000000000 0000000000000000 0000000000000001 ffff82d0803e5471
(XEN)    ffffffff81f631f0 0000000000000001 ffff82d0803e52bf ffffffff81001000
(XEN)    0000000000000001 ffff82d0803e5299 ffffffff80000000 0000000000000001
(XEN)    ffff82d0803e52b2 0000000000000000 0000000000000002 ffff82d0803e5401
(XEN)    ffff830c1b97bea0 0000000000000002 ffff82d0803e525d ffff830c1b97be74
(XEN) Xen call trace:
(XEN)    [<ffff82d080289024>] page_get_ram_type+0x9a/0xbb
(XEN)    [<ffff82d08040d57c>] arch_iommu_hwdom_init+0x28a/0x2ac
(XEN)    [<ffff82d08040753c>] iommu_hwdom_init+0x1d5/0x1e4
(XEN)    [<ffff82d080428c04>] dom0_construct_pv+0x280b/0x28d7
(XEN)    [<ffff82d08042b9ed>] construct_dom0+0x99/0xae4
(XEN)    [<ffff82d08041c358>] __start_xen+0x25ec/0x2723
(XEN)    [<ffff82d0802000f3>] __high_start+0x53/0x55
(XEN)
(XEN)
(XEN) ****************************************
(XEN) Panic on CPU 0:
(XEN) Assertion 'unreachable' failed at mm.c:468
(XEN) ****************************************

Let me know if I can help further.


Thanks,
Razvan

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