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Re: [Qemu-ppc] [PATCH v3] qemu crashes when a negative number used for '
From: |
Fam Zheng |
Subject: |
Re: [Qemu-ppc] [PATCH v3] qemu crashes when a negative number used for 'maxcpus' |
Date: |
Mon, 28 Aug 2017 22:27:28 +0800 |
User-agent: |
Mutt/1.8.3 (2017-05-23) |
Hi Seeteena, thanks for sending the patch and fixing the coding style!
I suggest to change subject to "vl: exit if maxcpus is negative". The subject of
a patch email is going to be the summary of the commit message when applied,
therefore it should be worded to summarize the change. Commonly there is a
"subsystem prefix" followed by a colon, like "vl:", "net:". While there is no
hard rule, the most suitable prefix can be guessed by inspecting the log of the
changed files. In the case of this patch: "git log vl.c".
A more detailed guide on submitting "perfect" QEMU patches can be found here,
in case for your future reference:
https://wiki.qemu.org/Contribute/SubmitAPatch
On Mon, 08/28 19:23, Seeteena Thoufeek wrote:
> ---Steps to Reproduce---
>
> When passed a negative number to 'maxcpus' parameter, Qemu aborts
> with a core dump.
>
> Run the following command with maxcpus argument as negative number
>
> ppc64-softmmu/qemu-system-ppc64 --nographic -vga none -machine
> pseries,accel=kvm,kvm-type=HV -m size=200g -device virtio-blk-pci,
> drive=rootdisk -drive file=/home/images/pegas-1.0-ppc64le.qcow2,
> if=none,cache=none,id=rootdisk,format=qcow2 -monitor telnet
> :127.0.0.1:1234,server,nowait -net nic,model=virtio -net
> user -redir tcp:2000::22 -device nec-usb-xhci -smp 8,cores=1,
> threads=1,maxcpus=-12
>
> (process:12149): GLib-ERROR **: gmem.c:130: failed to allocate
> 18446744073709550568 bytes
>
> Trace/breakpoint trap
>
> Reported-by: R.Nageswara Sastry <address@hidden>
> Signed-off-by: Seeteena Thoufeek <address@hidden>
> Reviewed-by: Bharata B Rao <address@hidden>
> ---
Would be good if there is a comment below a "---" line on how current revision
differs from the previous one, like:
---
v3: Fix coding style pointed out by patchew.
> vl.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/vl.c b/vl.c
> index 8e247cc..fb45b6d 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -1244,7 +1244,10 @@ static void smp_parse(QemuOpts *opts)
> }
>
> max_cpus = qemu_opt_get_number(opts, "maxcpus", cpus);
> -
> + if (max_cpus <= 0) {
> + error_report("Invalid max_cpus : %d", max_cpus);
The space before ":" can be dropped, I think.
> + exit(1);
> + }
> if (max_cpus < cpus) {
> error_report("maxcpus must be equal to or greater than smp");
> exit(1);
> --
> 1.8.3.1
>
Fam