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pcie_sriov: Reuse SR-IOV VF device instances

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Disable SR-IOV VF devices by reusing code to power down PCI devices
instead of removing them when the guest requests to disable VFs. This
allows to realize devices and report VF realization errors at PF
realization time.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20250116-reuse-v20-8-7cb370606368@daynix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Akihiko Odaki 2025-01-16 18:00:59 +09:00 • committed by Michael S. Tsirkin
parent 3391d68e90
commit cab1398a60
3 changed files with 51 additions and 58 deletions
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14
hw/pci/pci.c
View file

@ -2963,7 +2963,17 @@ MSIMessage pci_get_msi_message(PCIDevice *dev, int vector)
void pci_set_power(PCIDevice *d, bool state)
{
pci_set_enabled(d, state);
/*
* Don't change the enabled state of VFs when powering on/off the device.
*
* When powering on, VFs must not be enabled immediately but they must
* wait until the guest configures SR-IOV.
* When powering off, their corresponding PFs will be reset and disable
* VFs.
*/
if (!pci_is_vf(d)) {
pci_set_enabled(d, state);
}
}
void pci_set_enabled(PCIDevice *d, bool state)
@ -2977,7 +2987,7 @@ void pci_set_enabled(PCIDevice *d, bool state)
memory_region_set_enabled(&d->bus_master_enable_region,
(pci_get_word(d->config + PCI_COMMAND)
& PCI_COMMAND_MASTER) && d->enabled);
if (!d->enabled) {
if (qdev_is_realized(&d->qdev)) {
pci_device_reset(d);
}
}