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Re: [PATCH 1/1] pci/pcie: refuse another hotplug/unplug event if attenti
From: |
Maxim Levitsky |
Subject: |
Re: [PATCH 1/1] pci/pcie: refuse another hotplug/unplug event if attention button is pending |
Date: |
Wed, 29 Jul 2020 08:09:37 +0300 |
User-agent: |
Evolution 3.36.3 (3.36.3-1.fc32) |
On Wed, 2020-07-22 at 19:19 +0300, Maxim Levitsky wrote:
> On Wed, 2020-07-22 at 19:17 +0300, Maxim Levitsky wrote:
> > Curently it is possible to hotplug a device and then immediatly
> > hotunplug it before the OS notices, and that will result
> > in missed unplug event since we can only send one attention button event.
> >
> > Moreover the device will stuck in unplugging state forever.
> >
> > Error out in such cases and rely on the caller (e.g libvirt) to retry
> > the unplug a bit later
> >
> > Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
> > ---
> > hw/pci/pcie.c | 11 +++++++++++
> > 1 file changed, 11 insertions(+)
> >
> > diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
> > index 5b48bae0f6..9e836cf2f4 100644
> > --- a/hw/pci/pcie.c
> > +++ b/hw/pci/pcie.c
> > @@ -402,6 +402,17 @@ static void pcie_cap_slot_plug_common(PCIDevice
> > *hotplug_dev, DeviceState *dev,
> > */
> > error_setg_errno(errp, EBUSY, "slot is electromechanically
> > locked");
> > }
> > +
> > + if (sltsta & PCI_EXP_SLTSTA_ABP) {
> > + /*
> > + * Attention button is pressed, thus we can't send another
> > + * hotpplug event
> Typo here, forgot to refresh the commit.
> > + */
> > + error_setg_errno(errp, EBUSY,
> > + "attention button is already pressed, can't "
> > + "send another hotplug event");
> > + }
> > +
> > }
> >
> > void pcie_cap_slot_pre_plug_cb(HotplugHandler *hotplug_dev, DeviceState
> > *dev,
ping.
Best regards,
Maxim Levitsky