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vm-virtio: Allocate shared memory regions on dedicated BAR

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In the context of shared memory regions, they could not be present for
most of the virtio devices. For this reason, we prefer dedicate a BAR
for the shared memory regions.

Another reason is that memory regions, if there are several, can be
allocated all at once as a contiguous region, which then can be used as
its own BAR. It would be more complicated to try to allocate the BAR 0
holding the regular information about the virtio-pci device along with
the shared memory regions.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2019-08-05 17:58:55 -07:00 committed by Samuel Ortiz
parent e0fda0611c
commit f30ba069b7
1 changed files with 25 additions and 11 deletions
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36
vm-virtio/src/transport/pci_device.rs
View File

@ -394,17 +394,6 @@ impl VirtioPciDevice {
.add_capability(&configuration_cap)
.map_err(PciDeviceError::CapabilitiesSetup)?;
let shm_cap = VirtioPciCap64::new(
PciCapabilityType::SharedMemoryConfig,
settings_bar,
0,
0u64,
0u64,
);
self.configuration
.add_capability(&shm_cap)
.map_err(PciDeviceError::CapabilitiesSetup)?;
if self.msix_config.is_some() {
let msix_cap = MsixCap::new(
settings_bar,
@ -559,6 +548,31 @@ impl PciDevice for VirtioPciDevice {
// Once the BARs are allocated, the capabilities can be added to the PCI configuration.
self.add_pci_capabilities(virtio_pci_bar)?;
// Allocate a dedicated BAR if there are some shared memory regions.
if let Some(shm_list) = self.device.get_shm_regions() {
let config = PciBarConfiguration::default()
.set_register_index(2)
.set_address(shm_list.addr.raw_value())
.set_size(shm_list.len);
let virtio_pci_shm_bar =
self.configuration.add_pci_bar(&config).map_err(|e| {
PciDeviceError::IoRegistrationFailed(shm_list.addr.raw_value(), e)
})? as u8;
for (idx, shm) in shm_list.region_list.iter().enumerate() {
let shm_cap = VirtioPciCap64::new(
PciCapabilityType::SharedMemoryConfig,
virtio_pci_shm_bar,
idx as u8,
shm.offset,
shm.len,
);
self.configuration
.add_capability(&shm_cap)
.map_err(PciDeviceError::CapabilitiesSetup)?;
}
}
Ok(ranges)
}