From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Nicholas Piggin <npiggin@gmail.com>, kvm-ppc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org, Nicholas Piggin <npiggin@gmail.com>
Subject: Re: [1/2] KVM: PPC: Book3S HV: trace_tlbie must not be called in realmode
Date: Thu, 12 Apr 2018 00:49:30 +1000 (AEST) [thread overview]
Message-ID: <40Ln4V4S1xz9s3L@ozlabs.org> (raw)
In-Reply-To: <20180405175631.31381-2-npiggin@gmail.com>
On Thu, 2018-04-05 at 17:56:30 UTC, Nicholas Piggin wrote:
> This crashes with a "Bad real address for load" attempting to load
> from the vmalloc region in realmode (faulting address is in DAR).
>
> 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 4.16.0-01530-g43d1859f0994
> NIP: c0000000000155ac LR: c0000000000c2430 CTR: c000000000015580
> REGS: c000000fff76dd80 TRAP: 0200 Not tainted (4.16.0-01530-g43d1859f0994)
> 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
>
> I suspect the reason is the per-cpu data is not in the linear chunk.
> This could be restored if that was able to be fixed, but for now,
> just remove the tracepoints.
>
> Fixes: 0428491cba ("powerpc/mm: Trace tlbie(l) instructions")
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Applied to powerpc fixes, thanks.
https://git.kernel.org/powerpc/c/19ce7909ed11c49f7eddf59e7f49cd
cheers
next prev parent reply other threads:[~2018-04-11 14:49 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-05 17:56 [PATCH 0/2] KVM powerpc tlbie scalability improvement Nicholas Piggin
2018-04-05 17:56 ` [PATCH 1/2] KVM: PPC: Book3S HV: trace_tlbie must not be called in realmode Nicholas Piggin
2018-04-08 10:17 ` Balbir Singh
2018-04-08 13:41 ` Nicholas Piggin
2018-04-10 3:21 ` Michael Ellerman
2018-04-10 5:55 ` Naveen N. Rao
2018-04-10 6:10 ` Nicholas Piggin
2018-04-11 14:49 ` Michael Ellerman [this message]
2018-04-05 17:56 ` [PATCH 2/2] KVM: PPC: Book3S HV: lockless tlbie for HPT hcalls Nicholas Piggin
2018-04-06 5:39 ` Nicholas Piggin
2018-04-06 6:12 ` Michael Ellerman
2018-05-10 5:30 ` Paul Mackerras
2018-05-14 4:04 ` Michael Ellerman
2018-05-17 3:53 ` Paul Mackerras
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