On Fri, Jun 09, 2017 at 04:16:15PM +0100, Stefan Hajnoczi wrote:
> Commit e987c37aee1752177906847630d32477da57e705 ("hw/i386: check if
> nvdimm is enabled before plugging") introduced a check to reject nvdimm
> hotplug if -machine pc,nvdimm=on was not given.
>
> This check executes after pc_dimm_memory_plug() has already completed
> and does not reverse the effect of this function in the case of failure.
>
> Perform the check before calling pc_dimm_memory_plug(). This fixes the
> following abort:
>
> $ qemu -M accel=kvm -m 1G,slots=4,maxmem=8G \
> -object
> memory-backend-file,id=mem1,share=on,mem-path=nvdimm.dat,size=1G
> (qemu) device_add nvdimm,memdev=mem1
> nvdimm is not enabled: missing 'nvdimm' in '-M'
> (qemu) device_add nvdimm,memdev=mem1
> Core dumped
>
> The backtrace is:
>
> #0 0x00007fffdb5b191f in raise () at /lib64/libc.so.6
> #1 0x00007fffdb5b351a in abort () at /lib64/libc.so.6
> #2 0x00007fffdb5a9da7 in __assert_fail_base () at /lib64/libc.so.6
> #3 0x00007fffdb5a9e52 in () at /lib64/libc.so.6
> #4 0x000055555577a5fa in qemu_ram_set_idstr (new_block=0x555556747a00,
> name=<optimized out>, dev=dev@entry=0x555556705590) at qemu/exec.c:1709
> #5 0x0000555555a0fe86 in vmstate_register_ram (mr=mr@entry=0x55555673a0e0,
> dev=dev@entry=0x555556705590) at migration/savevm.c:2293
> #6 0x0000555555965088 in pc_dimm_memory_plug
> (dev=dev@entry=0x555556705590, hpms=hpms@entry=0x5555566bb0e0,
> mr=mr@entry=0x555556705630, align=<optimized out>,
> errp=errp@entry=0x7fffffffc660)
> at hw/mem/pc-dimm.c:110
> #7 0x000055555581d89b in pc_dimm_plug (errp=0x7fffffffc6c0,
> dev=0x555556705590, hotplug_dev=<optimized out>) at qemu/hw/i386/pc.c:1713
> #8 0x000055555581d89b in pc_machine_device_plug_cb (hotplug_dev=<optimized
> out>, dev=0x555556705590, errp=0x7fffffffc6c0) at qemu/hw/i386/pc.c:2004
> #9 0x0000555555914da6 in device_set_realized (obj=<optimized out>,
> value=<optimized out>, errp=0x7fffffffc7e8) at hw/core/qdev.c:926
>
> Cc: Haozhong Zhang <haozhong.zh...@intel.com>
> Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
> ---
> hw/i386/pc.c | 14 ++++++++------
> 1 file changed, 8 insertions(+), 6 deletions(-)
Michael: Do you want to take this through your tree?
>
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index 5b8c6fb..db41cca 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -1692,6 +1692,7 @@ static void pc_dimm_plug(HotplugHandler *hotplug_dev,
> PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
> MemoryRegion *mr = ddc->get_memory_region(dimm);
> uint64_t align = TARGET_PAGE_SIZE;
> + bool is_nvdimm = object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM);
>
> if (memory_region_get_alignment(mr) && pcmc->enforce_aligned_dimm) {
> align = memory_region_get_alignment(mr);
> @@ -1703,17 +1704,18 @@ static void pc_dimm_plug(HotplugHandler *hotplug_dev,
> goto out;
> }
>
> + if (is_nvdimm && !pcms->acpi_nvdimm_state.is_enabled) {
> + error_setg(&local_err,
> + "nvdimm is not enabled: missing 'nvdimm' in '-M'");
> + goto out;
> + }
> +
> pc_dimm_memory_plug(dev, &pcms->hotplug_memory, mr, align, &local_err);
> if (local_err) {
> goto out;
> }
>
> - if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) {
> - if (!pcms->acpi_nvdimm_state.is_enabled) {
> - error_setg(&local_err,
> - "nvdimm is not enabled: missing 'nvdimm' in '-M'");
> - goto out;
> - }
> + if (is_nvdimm) {
> nvdimm_plug(&pcms->acpi_nvdimm_state);
> }
>
> --
> 2.9.4
>
>
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