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pcie_sriov: Do not reset NumVFs after disabling VFs 

The spec does not NumVFs is reset after disabling VFs except when
resetting the PF. Clearing it is guest visible and out of spec, even
though Linux doesn't rely on this value being preserved, so we never
noticed.

Fixes: 7c0fa8dff8 ("pcie: Add support for Single Root I/O Virtualization (SR/IOV)")
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20240228-reuse-v8-4-282660281e60@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 2024-02-28 20:33:15 +09:00 committed by Michael S. Tsirkin
parent c8bc4db403
commit 63eb76dda2
1 changed files with 2 additions and 1 deletions
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3
hw/pci/pcie_sriov.c
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@ -215,7 +215,6 @@ static void unregister_vfs(PCIDevice *dev)
g_free(dev->exp.sriov_pf.vf);
dev->exp.sriov_pf.vf = NULL;
dev->exp.sriov_pf.num_vfs = 0;
pci_set_word(dev->config + dev->exp.sriov_cap + PCI_SRIOV_NUM_VF, 0);
}
void pcie_sriov_config_write(PCIDevice *dev, uint32_t address,
@ -260,6 +259,8 @@ void pcie_sriov_pf_reset(PCIDevice *dev)
pci_set_word(dev->config + sriov_cap + PCI_SRIOV_CTRL, 0);
unregister_vfs(dev);
pci_set_word(dev->config + sriov_cap + PCI_SRIOV_NUM_VF, 0);
/*
* Default is to use 4K pages, software can modify it
* to any of the supported bits