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7c1bd80cc2
It's possible to take a SRESET or MCE in these paths due to a bug
in the host code or a NMI IPI, etc. A recent bug attempting to load
a virtual address from real mode gave th complete but cryptic error,
abridged:
Oops: Bad interrupt in KVM entry/exit code, sig: 6 [#1]
LE SMP NR_CPUS=2048 NUMA PowerNV
CPU: 53 PID: 6582 Comm: qemu-system-ppc Not tainted
NIP: c0000000000155ac LR: c0000000000c2430 CTR: c000000000015580
REGS: c000000fff76dd80 TRAP: 0200 Not tainted
MSR: 9000000000201003 <SF,HV,ME,RI,LE> CR: 48082222 XER: 00000000
CFAR: 0000000102900ef0 DAR: d00017fffd941a28 DSISR: 00000040 SOFTE: 3
NIP [c0000000000155ac] perf_trace_tlbie+0x2c/0x1a0
LR [c0000000000c2430] do_tlbies+0x230/0x2f0
Sending the NMIs through the Linux handlers gives a nicer output:
Severe Machine check interrupt [Not recovered]
NIP [c0000000000155ac]: perf_trace_tlbie+0x2c/0x1a0
Initiator: CPU
Error type: Real address [Load (bad)]
Effective address: d00017fffcc01a28
opal: Machine check interrupt unrecoverable: MSR(RI=0)
opal: Hardware platform error: Unrecoverable Machine Check exception
CPU: 0 PID: 6700 Comm: qemu-system-ppc Tainted: G M
NIP: c0000000000155ac LR: c0000000000c23c0 CTR: c000000000015580
REGS: c000000fff9e9d80 TRAP: 0200 Tainted: G M
MSR: 9000000000201001 <SF,HV,ME,LE> CR: 48082222 XER: 00000000
CFAR: 000000010cbc1a30 DAR: d00017fffcc01a28 DSISR: 00000040 SOFTE: 3
NIP [c0000000000155ac] perf_trace_tlbie+0x2c/0x1a0
LR [c0000000000c23c0] do_tlbies+0x1c0/0x280
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.