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Re: [PATCH] hw/pci/pcie: Forbid hot-plug via QMP if it's disabled on the
From: |
Michael S. Tsirkin |
Subject: |
Re: [PATCH] hw/pci/pcie: Forbid hot-plug via QMP if it's disabled on the slot |
Date: |
Mon, 13 Apr 2020 06:54:51 -0400 |
On Wed, Apr 08, 2020 at 12:51:20PM +0200, Igor Mammedov wrote:
> On Tue, 7 Apr 2020 16:50:17 +0200
> Julia Suvorova <address@hidden> wrote:
>
> > Raise an error when trying to hot-plug/unplug a device through QMP to a
> > device
> > with disabled hot-plug capability. This makes the device behaviour more
> > consistent and provides an explanation of the failure in the case of
> > asynchronous unplug.
>
> it applies to hotplug in general (i.e. not only QMP)
>
> >
> > Signed-off-by: Julia Suvorova <address@hidden>
> > ---
> > hw/pci/pcie.c | 24 +++++++++++++++++++++---
> > 1 file changed, 21 insertions(+), 3 deletions(-)
> >
> > diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
> > index 0eb3a2a5d2..e9798caa8a 100644
> > --- a/hw/pci/pcie.c
> > +++ b/hw/pci/pcie.c
> > @@ -415,6 +415,7 @@ void pcie_cap_slot_plug_cb(HotplugHandler *hotplug_dev,
> > DeviceState *dev,
> > {
> > PCIDevice *hotplug_pdev = PCI_DEVICE(hotplug_dev);
> > uint8_t *exp_cap = hotplug_pdev->config + hotplug_pdev->exp.exp_cap;
> > + uint32_t sltcap = pci_get_word(exp_cap + PCI_EXP_SLTCAP);
> > PCIDevice *pci_dev = PCI_DEVICE(dev);
> >
> > /* Don't send event when device is enabled during qemu machine
> > creation:
> > @@ -430,6 +431,13 @@ void pcie_cap_slot_plug_cb(HotplugHandler
> > *hotplug_dev, DeviceState *dev,
> > return;
> > }
> >
> > + /* Hot-plug is disabled on the slot */
> > + if ((sltcap & PCI_EXP_SLTCAP_HPC) == 0) {
> > + error_setg(errp, "Device '%s' does not support hot-plug",
> > + DEVICE(hotplug_dev)->id);
> plug and unplug_req are synchronous. so one can skip on "Device '%s'",
> user will get this error message as response to device_add/del command.
>
> and more exactly it's concrete slot that does not support hotplug, how about
> "slot doesn't support ..." or just "hotlpug is not supported"
Well device name is useful here, while these commands are synchronous
others aren't so log parsing might not be synchronous.
I do think we should mention slot since that's the reason
hotplug failed:
"Device '%s' hot-plug failed: unsupported by slot"
> > + return;
> > + }
> > +
> > /* To enable multifunction hot-plug, we just ensure the function
> > * 0 added last. When function 0 is added, we set the sltsta and
> > * inform OS via event notification.
> > @@ -464,14 +472,24 @@ static void pcie_unplug_device(PCIBus *bus, PCIDevice
> > *dev, void *opaque)
> > object_unparent(OBJECT(dev));
> > }
> >
> > -void pcie_cap_slot_unplug_request_cb(HotplugHandler *hotplug_dev,
> > +void pcie_cap_slot_unplug_request_cb(HotplugHandler *hotplug_handler,
> > DeviceState *dev, Error **errp)
> > {
> > Error *local_err = NULL;
> > PCIDevice *pci_dev = PCI_DEVICE(dev);
> > PCIBus *bus = pci_get_bus(pci_dev);
> > + PCIDevice *hotplug_dev = PCI_DEVICE(hotplug_handler);
> > + uint8_t *exp_cap = hotplug_dev->config + hotplug_dev->exp.exp_cap;
> > + uint32_t sltcap = pci_get_word(exp_cap + PCI_EXP_SLTCAP);
> > +
> > + /* Hot-unplug is disabled on the slot */
> > + if ((sltcap & PCI_EXP_SLTCAP_HPC) == 0) {
> > + error_setg(errp, "Device '%s' does not support hot-unplug",
> > + DEVICE(hotplug_dev)->id);
> > + return;
Here too let's mention slot since that's the reason
hotplug failed:
"Device '%s' hot-unplug failed: unsupported by slot"
?
> > + }
> >
> > - pcie_cap_slot_plug_common(PCI_DEVICE(hotplug_dev), dev, &local_err);
> > + pcie_cap_slot_plug_common(hotplug_dev, dev, &local_err);
> > if (local_err) {
> > error_propagate(errp, local_err);
> > return;
> > @@ -490,7 +508,7 @@ void pcie_cap_slot_unplug_request_cb(HotplugHandler
> > *hotplug_dev,
> > return;
> > }
> >
> > - pcie_cap_slot_push_attention_button(PCI_DEVICE(hotplug_dev));
> > + pcie_cap_slot_push_attention_button(hotplug_dev);
> > }
> >
> > /* pci express slot for pci express root/downstream port
- [PATCH] hw/pci/pcie: Forbid hot-plug via QMP if it's disabled on the slot, Julia Suvorova, 2020/04/07
- Re: [PATCH] hw/pci/pcie: Forbid hot-plug via QMP if it's disabled on the slot, Igor Mammedov, 2020/04/08
- Re: [PATCH] hw/pci/pcie: Forbid hot-plug via QMP if it's disabled on the slot,
Michael S. Tsirkin <=
- Re: [PATCH] hw/pci/pcie: Forbid hot-plug via QMP if it's disabled on the slot, Julia Suvorova, 2020/04/15
- Re: [PATCH] hw/pci/pcie: Forbid hot-plug via QMP if it's disabled on the slot, Michael S. Tsirkin, 2020/04/17
- Re: [PATCH] hw/pci/pcie: Forbid hot-plug via QMP if it's disabled on the slot, Julia Suvorova, 2020/04/17
- Re: [PATCH] hw/pci/pcie: Forbid hot-plug via QMP if it's disabled on the slot, Michael S. Tsirkin, 2020/04/17
- Re: [PATCH] hw/pci/pcie: Forbid hot-plug via QMP if it's disabled on the slot, Julia Suvorova, 2020/04/17
Re: [PATCH] hw/pci/pcie: Forbid hot-plug via QMP if it's disabled on the slot, Marcel Apfelbaum, 2020/04/14