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pci: vfio: Check VFIO device interrupt's support

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In case the VFIO device does not support MSI or MSI-X, the capabilities
should not be parsed, avoiding the exposure of unsupported capabilities.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2021-02-10 14:38:47 +01:00 committed by Rob Bradford
parent 27515a6ec4
commit 9af477e964
1 changed files with 14 additions and 2 deletions
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16
pci/src/vfio.rs
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@ -537,10 +537,22 @@ impl VfioPciDevice {
match PciCapabilityID::from(cap_id) {
PciCapabilityID::MessageSignalledInterrupts => {
self.parse_msi_capabilities(cap_next, interrupt_manager);
if let Some(irq_info) = self.device.get_irq_info(VFIO_PCI_MSI_IRQ_INDEX) {
if irq_info.count > 0 {
// Parse capability only if the VFIO device
// supports MSI.
self.parse_msi_capabilities(cap_next, interrupt_manager);
}
}
}
PciCapabilityID::MSIX => {
self.parse_msix_capabilities(cap_next, interrupt_manager);
if let Some(irq_info) = self.device.get_irq_info(VFIO_PCI_MSIX_IRQ_INDEX) {
if irq_info.count > 0 {
// Parse capability only if the VFIO device
// supports MSI-X.
self.parse_msix_capabilities(cap_next, interrupt_manager);
}
}
}
_ => {}
};