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Re: [Qemu-devel] [PATCH v3 3/4] virtio-blk-test.c: add hotplug subtest


From: Gonglei (Arei)
Subject: Re: [Qemu-devel] [PATCH v3 3/4] virtio-blk-test.c: add hotplug subtest
Date: Fri, 6 Jun 2014 08:05:15 +0000

> -----Original Message-----
> From: Amos Kong [mailto:address@hidden
> Sent: Friday, June 06, 2014 1:29 PM
> To: Gonglei (Arei)
> Cc: address@hidden; address@hidden; address@hidden
> Subject: Re: [PATCH v3 3/4] virtio-blk-test.c: add hotplug subtest
> 
> On Fri, Jun 06, 2014 at 01:28:59AM +0000, Gonglei (Arei) wrote:
> > Hi, Amos
> >
> > > -----Original Message-----
> > > From: Amos Kong [mailto:address@hidden
> > > Sent: Friday, June 06, 2014 9:12 AM
> > > To: address@hidden
> > > Cc: address@hidden; address@hidden; Gonglei (Arei)
> > > Subject: [PATCH v3 3/4] virtio-blk-test.c: add hotplug subtest
> > >
> > > This patch adds a new subtest, it hotplugs 29 * 8 = 232 virtio-blk
> > > devices to guest, and try to hot-unplug them.
> > >
> > > Note: the hot-unplug can't work without cooperation of guest OS.
> 
> 
> > > +static void test_blk_hotplug(void)
> > > +{
> > > +    int i, j;
> > > +
> > > +    /* start with no network/block device, slots 3~0x1f are free */
> > > +    qtest_start("-net none");
> > > +
> > > +    for (i = 3; i <= 0x1f; i++) {
> > > +        for (j = 7; j >= 0; j--) {
> > > +            qmp_exec_hmp_cmd("OK\r\n",
> > > +                             "drive_add 0
> > > if=none,file=/dev/null,id=drv-%x.%x",
> > > +                             i, j);
> > > +            qmp_exec_hmp_cmd("",
> > > +                       "device_add
> > > virtio-blk-pci,id=dev-%x.%x,drive=drv-%x.%x,"
> > > +                       "addr=0x%x.%x,multifunction=on", i, j, i, j, i,
> j);
> > > +        }
> > > +    }
> >
> > Do the pci multifunction devices support hotplug/unplug yet?
> 
> Yes.
> 
> You can hotplug single functions one by one, guest will identify
> all the functions when function 0 is added.
> Hotunplug function 0, all functions in same slot will be removed.
> 
Thanks.

IMHO, if we hot-plug function 0 first, the other functions will be not support 
to
hot-plug. Similarly, it will not be allowed if we only hot-unplug function 1~7,
but function 0, right?

Best regards,
-Gonglei




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