[Xen-devel] [ARM] gvirt_to_maddr fails when DomU is created

[Volodymyr Babchuk <vlad.babchuk@xxxxxxxxx>]

Hello community,

After creating domU, I'm seeing lots of this messages from hypervisor:

(XEN) p2m.c:1442: d1v0: gvirt_to_maddr failed va=0xffff80000efc7f0f
flags=0x1 par=0x809
(XEN) p2m.c:1442: d1v0: gvirt_to_maddr failed va=0xffff80000efc7f00
flags=0x1 par=0x809
(XEN) p2m.c:1442: d1v0: gvirt_to_maddr failed va=0xffff80000efc7f0f
flags=0x1 par=0x809

Interestingly, I'm getting them from both Dom0 and DomU:

(XEN) p2m.c:1442: d0v0: gvirt_to_maddr failed va=0xffff80003efd7f0f
flags=0x1 par=0x809
(XEN) p2m.c:1442: d1v0: gvirt_to_maddr failed va=0xffff80000efc7f0f
flags=0x1 par=0x809

But only after DomU is created.

I attached GDB and found that this is caused by update_runstate_area:

(gdb) bt
#0  get_page_from_gva (v=0x80005dbe2000, v@entry=0x22f2c8 <schedule+1236>,
    va=va@entry=18446603337277996815, flags=flags@entry=1) at p2m.c:1440
#1  0x000000000024e320 in translate_get_page (write=true, linear=true,
addr=18446603337277996815,
    info=...) at guestcopy.c:37
#2  copy_guest (buf=buf@entry=0x80005dbe20d7,
addr=addr@entry=18446603337277996815, len=len@entry=1,
    info=..., flags=flags@entry=6) at guestcopy.c:69
#3  0x000000000024e45c in raw_copy_to_guest (to=to@entry=0xffff80003efd7f0f,
    from=from@entry=0x80005dbe20d7, len=len@entry=1) at guestcopy.c:110
#4  0x00000000002497b4 in update_runstate_area
(v=v@entry=0x80005dbe2000) at domain.c:287
#5  0x0000000000249eb8 in context_switch (prev=prev@entry=0x80005dbe2000,
    next=next@entry=0x80005bf3c000) at domain.c:344
#6  0x000000000022f2c8 in schedule () at schedule.c:1583
#7  0x0000000000232c10 in __do_softirq
(ignore_mask=ignore_mask@entry=0) at softirq.c:50
#8  0x0000000000232ca4 in do_softirq () at softirq.c:64
#9  0x0000000000258254 in leave_hypervisor_tail () at traps.c:2302

This issue is encountered on QEMU-ARMv8. Dom0 kernel is Linux 4.19.0
My XEN master is at d8ffac1f7 "xen/arm: gic: Remove duplicated comment
in do_sgi"

The same setup worked perfectly with Xen 4.10.2

Julien, I saw on mailing list, that you paid attention to issues with
gvirt_to_maddr,
so maybe you can be interested in this.

-- 
WBR Volodymyr Babchuk aka lorc [+380976646013]
mailto: vlad.babchuk@xxxxxxxxx

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