Here is a patch for xen-4 (ioemu).
Jean
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---
diff --git a/xen-vl-extra.c b/xen-vl-extra.c
index 206ac65..bafc5a4 100644
--- a/xen-vl-extra.c
+++ b/xen-vl-extra.c
@@ -111,13 +111,18 @@ void do_pci_del(char *devname)
devfn = bdf_to_devfn(devname);
- if (devfn < 0)
+ if (devfn < 0 && devfn == 0x10)
fprintf(logfile, "Device \"%s\" is not used by a hotplug device.\n",
devname_cpy);
else
acpi_php_del(devfn);
free(devname_cpy);
+ if (devfn == 0x10)
+ {
+ power_off_php_devfn(devfn);
+ xenstore_record_dm_state("pci-removed");
+ }
}
void do_pci_add(char *devname)
On Mon, Jun 07, 2010 at 02:54:00AM +0100, 于佳耕 wrote:
>
> It seems a complex work. Could you give the old patch, and I try to port it
> on Xen4.0.
>
> 2010/6/5 Jean Guyader
> <jean.guyader@xxxxxxxxxxxxx<mailto:jean.guyader@xxxxxxxxxxxxx>>
>
> Hi,
>
> I tried that in the past and is was working fine but you have to put the
> guest into S3 (acpi suspend to RAM) first, then we don't have to wait for
> any ACPI hotplug ack (you could remove some code in qemu for that).
>
> Jean
>
> On Fri, Jun 04, 2010 at 10:29:43AM +0100, 于佳耕 wrote:
> > Hi,
> >
> > I want to switch video card live between two HVMs. My simplest idea is that
> > when the HVM has the permission to access passthrough video card, and
> > another HVM will be paused. If switch from A to B, execute commands :
> >
> > xm pause A ;
> > xm pci-detach A 00:00:02.0 ;
> > xm pci-attach B 00:00:02.0 ;
> > xm unpause B.
> >
> > I have a try, but failed. The pseudo-code is as below. Can you give me some
> > ideas? Any suggestions will be thankful.
> >
> > Execute “xm pci-detach Domain 00:00:02.0”:
> >
> > 1. Raise sci interrupt to unplug the device. If OSPM doesn’t handle
> > the unplug process, and then invoke acpi_php_writeb to power off the device.
> >
> > 2. Modify power_off_php_devfn function:
> > int power_off_php_devfn(int php_devfn)
> > {
> > If(php_devfn == 0x10) // Intel integrated graphics
> > {
> > p = & dpci_infos.php_devs[php_devfn];
> >
> > // save the two-tuples : (php_dev, domid)
> > save_php_device_by_domid(p,domid);
> >
> > // hide the device from bus and dpci_infos
> > pci_hide_device(& p->pt_dev->dev);
> > memset(p,0x00,sizeof(struct php_dev));
> >
> > return 0;
> > }
> >
> > return unregister_real_device(php_devfn);
> >
> > }
> >
> > Execute “xm pci-attach Domain 00:00:02.0”:
> >
> > 1. Modify power_on_php_devfn function:
> >
> > int power_off_php_devfn(int devfn)
> >
> > {
> >
> > ….
> >
> > while(devfn == 0x10) // Intel integrated graphics
> >
> > {
> >
> > if( ! get_php_device_by_domid(p,domid) ) // get saved
> > php_dev struct
> >
> > break; //
> > cannot get , create new one
> >
> >
> >
> > //restore the php device to bus and dpci_infos
> >
> > restore_php_device(p,devfn); // restore
> > dpci_infos.php_devs[devfn]
> >
> > dpci_infos->e_bus->devices[devfn] = p-> pt_dev->dev;
> >
> >
> >
> > return 0;
> >
> > }
> >
> >
> >
> > if (!dpci_infos.pci_access)
> >
> > {…}
> >
> > pt_dev = register_real_device(..);
> >
> > return 0;
> >
> > }
> >
> > This plan hides the VGA device from HVM and never destroys it. Both mmio
> > and pio maps are reserved. When finishing “xm unpause B”, it seems working
> > well observed by Dom0 serial port login. But the screen is black and cannot
> > receive any signal. I am confusing. Video BIOS should be reloaded? Or need
> > raise some interrupt to flush screen?
> >
> >
> > Thanks & Regards,
> > Yujiageng
>
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx<mailto:Xen-devel@xxxxxxxxxxxxxxxxxxx>
> > http://lists.xensource.com/xen-devel
>
>
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