Am 15.07.2011 12:34, schrieb Stefano Stabellini:
> On Fri, 1 Jul 2011, Stefano Stabellini wrote:
>> On Fri, 1 Jul 2011, Kevin Wolf wrote:
>>> Am 30.06.2011 16:16, schrieb Stefano Stabellini:
>>>> On Thu, 30 Jun 2011, Kevin Wolf wrote:
>>>>>> +static int pci_piix3_xen_ide_unplug(DeviceState *dev)
>>>>>> +{
>>>>>> + PCIDevice *pci_dev;
>>>>>> + PCIIDEState *pci_ide;
>>>>>> + DriveInfo *di;
>>>>>> + int i = 0;
>>>>>> +
>>>>>> + pci_dev = DO_UPCAST(PCIDevice, qdev, dev);
>>>>>> + pci_ide = DO_UPCAST(PCIIDEState, dev, pci_dev);
>>>>>> +
>>>>>> + for (; i < 3; i++) {
>>>>>> + di = drive_get_by_index(IF_IDE, i);
>>>>>> + if (di != NULL && di->bdrv != NULL && !di->bdrv->removable) {
>>>>>> + DeviceState *ds = bdrv_get_attached(di->bdrv);
>>>>>> + if (ds) {
>>>>>> + bdrv_detach(di->bdrv, ds);
>>>>>> + }
>>>>>> + bdrv_close(di->bdrv);
>>>>>> + pci_ide->bus[di->bus].ifs[di->unit].bs = NULL;
>>>>>
>>>>> Have you tested if this is enough if the guest tries to continue using
>>>>> the device? I don't know of any case where it's not sufficient, just
>>>>> trying to make sure that it's really true in practice.
>>>>
>>>> The purpose of this is to "hide" the disk from the guest. The unplug is
>>>> supposed to happen *before* the guest enumerates the IDE disks; it is
>>>> responsibility of the guest to make sure of it.
>>>> I tested it with Linux PV on HVM drivers, and Linux doesn't see the
>>>> emulated disk after the unplug, as it should be.
>>>
>>> Yeah. What I meant is that we should make sure that a misbehaving guest,
>>> which just keeps on playing with the IDE ports anyway, can't crash qemu.
>>> A quick review suggests that it is the case, but testing it anyway would
>>> be better.
>>
>> I see what you mean: I tested it, a guest cannot crash Qemu.
>>
>
> ping?
I thought Alex had already merged it. I'm pretty sure that I stated
somewhere that the patch is okay for me now. In case I didn't:
Acked-by: Kevin Wolf <kwolf@xxxxxxxxxx>
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
Home