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vfio: pci: Mask multi function device bit

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In order to support VFIO for devices supporting multiple functions,
we need to mask the multi-function bit (bit 7 from Header Type byte).
Otherwise, the guest kernel ends up tryng to enumerate those devices.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2019-07-30 10:04:41 -07:00 committed by Samuel Ortiz
parent b6ae2ccda4
commit 347f8a036b
1 changed files with 10 additions and 2 deletions
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12
vfio/src/vfio_pci.rs
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@ -694,8 +694,6 @@ impl BusDevice for VfioPciDevice {
// First BAR offset in the PCI config space.
const PCI_CONFIG_BAR_OFFSET: u32 = 0x10;
// First BAR register index
const PCI_CONFIG_BAR0_INDEX: usize = 4;
// Capability register offset in the PCI config space.
const PCI_CONFIG_CAPABILITY_OFFSET: u32 = 0x34;
// IO BAR when first BAR bit is 1.
@ -708,6 +706,10 @@ const PCI_CONFIG_MEMORY_BAR_64BIT: u32 = 0x4;
const PCI_CONFIG_REGISTER_SIZE: usize = 4;
// Number of BARs for a PCI device
const BAR_NUMS: usize = 6;
// PCI Header Type register index
const PCI_HEADER_TYPE_REG_INDEX: usize = 3;
// First BAR register index
const PCI_CONFIG_BAR0_INDEX: usize = 4;
// PCI ROM expansion BAR register index
const PCI_ROM_EXP_BAR_INDEX: usize = 12;
// PCI interrupt pin and line register index
@ -915,8 +917,14 @@ impl PciDevice for VfioPciDevice {
// mask in case the register being read correspond to the interrupt
// register, this code makes sure to always expose an Interrupt Pin
// value of 0, which stands for no interrupt pin support.
//
// Since we don't support passing multi-functions devices, we should
// mask the multi-function bit, bit 7 of the Header Type byte on the
// register 3.
let mask = if reg_idx == PCI_INTX_REG_INDEX {
0xffff_00ff
} else if reg_idx == PCI_HEADER_TYPE_REG_INDEX {
0xff7f_ffff
} else {
0xffff_ffff
};