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Re: [PATCH 0/2] target/sparc: Enable MTTCG
From: |
Mark Cave-Ayland |
Subject: |
Re: [PATCH 0/2] target/sparc: Enable MTTCG |
Date: |
Thu, 22 Jun 2023 15:36:41 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 |
On 20/06/2023 17:40, Richard Henderson wrote:
With the addition of TCG_GUEST_DEFAULT_MO, there's nothing in
the cpu emulation preventing this from working. There is some
board model work to be done for sparc64, where max_cpus = 1.
I've tried testing this with the Advent Calendar image at
https://qemu-advent-calendar.org/2018/download/day11.tar.xz and even without these
patches applied I'm seeing hangs with -smp 2. When applied on top of the other
"target/sparc: Use tcg_gen_lookup_and_goto_ptr" series I get assert() after a minute
or two:
ERROR:../accel/tcg/tcg-accel-ops-mttcg.c:110:mttcg_cpu_thread_fn: assertion failed:
(cpu->halted)
Bail out! ERROR:../accel/tcg/tcg-accel-ops-mttcg.c:110:mttcg_cpu_thread_fn: assertion
failed: (cpu->halted)
It may be wise to try and figure out what's going on with git head first before
applying this. In particular /proc/cpuinfo suggests things aren't right with -smp 2:
# cat /proc/cpuinfo
cpu : Texas Instruments, Inc. - SuperSparc-(II)
fpu : SuperSparc on-chip FPU
promlib : Version 3 Revision 2
prom : 2.25
type : sun4m
ncpus probed : 2
ncpus active : 1
CPU0Bogo : 213.50
CPU0ClkTck : 0
MMU type : TI Viking/MXCC
contexts : 65536
nocache total : 3145728
nocache used : 375552
Richard Henderson (2):
target/sparc: Set TCG_GUEST_DEFAULT_MO
configs: Enable MTTCG for sparc, sparc64
configs/targets/sparc-softmmu.mak | 1 +
configs/targets/sparc64-softmmu.mak | 1 +
target/sparc/cpu.h | 23 +++++++++++++++++++++++
3 files changed, 25 insertions(+)
ATB,
Mark.