Intel-IOMMU, intr-remap: source-id checking
To support domain-isolation usages, the platform hardware must be
capable of uniquely identifying the requestor (source-id) for each
interrupt message. Without source-id checking for interrupt remapping
, a rouge guest/VM with assigned devices can launch interrupt attacks
to bring down anothe guest/VM or the VMM itself.
This patch adds source-id checking for interrupt remapping, and then
really isolates interrupts for guests/VMs with assigned devices.
Because PCI subsystem is not initialized yet when set up IOAPIC
entries, use read_pci_config_byte to access PCI config space directly.
Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/pci/intr_remapping.h b/drivers/pci/intr_remapping.h
index ca48f0d..63a263c 100644
--- a/drivers/pci/intr_remapping.h
+++ b/drivers/pci/intr_remapping.h
@@ -3,6 +3,8 @@
struct ioapic_scope {
struct intel_iommu *iommu;
unsigned int id;
+ unsigned int bus; /* PCI bus number */
+ unsigned int devfn; /* PCI devfn number */
};
#define IR_X2APIC_MODE(mode) (mode ? (1 << 11) : 0)