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pci: vfio: Move {read,write}_config_register() to VfioCommon

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These functions are used for the implementation of PciDevice.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2021-07-08 15:30:30 +00:00 committed by Sebastien Boeuf
parent a5f4d79547
commit 1997152ee1
1 changed files with 85 additions and 76 deletions
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159
pci/src/vfio.rs
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@ -866,6 +866,87 @@ impl VfioCommon {
None
}
pub(crate) fn write_config_register(
&mut self,
reg_idx: usize,
offset: u64,
data: &[u8],
wrapper: &dyn Vfio,
) -> Option<Arc<Barrier>> {
// When the guest wants to write to a BAR, we trap it into
// our local configuration space. We're not reprogramming
// VFIO device.
if (PCI_CONFIG_BAR0_INDEX..PCI_CONFIG_BAR0_INDEX + BAR_NUMS).contains(&reg_idx)
|| reg_idx == PCI_ROM_EXP_BAR_INDEX
{
// We keep our local cache updated with the BARs.
// We'll read it back from there when the guest is asking
// for BARs (see read_config_register()).
self.configuration
.write_config_register(reg_idx, offset, data);
return None;
}
let reg = (reg_idx * PCI_CONFIG_REGISTER_SIZE) as u64;
// If the MSI or MSI-X capabilities are accessed, we need to
// update our local cache accordingly.
// Depending on how the capabilities are modified, this could
// trigger a VFIO MSI or MSI-X toggle.
if let Some((cap_id, cap_base)) = self.interrupt.accessed(reg) {
let cap_offset: u64 = reg - cap_base + offset;
match cap_id {
PciCapabilityId::MessageSignalledInterrupts => {
if let Err(e) = self.update_msi_capabilities(cap_offset, data, wrapper) {
error!("Could not update MSI capabilities: {}", e);
}
}
PciCapabilityId::MsiX => {
if let Err(e) = self.update_msix_capabilities(cap_offset, data, wrapper) {
error!("Could not update MSI-X capabilities: {}", e);
}
}
_ => {}
}
}
// Make sure to write to the device's PCI config space after MSI/MSI-X
// interrupts have been enabled/disabled. In case of MSI, when the
// interrupts are enabled through VFIO (using VFIO_DEVICE_SET_IRQS),
// the MSI Enable bit in the MSI capability structure found in the PCI
// config space is disabled by default. That's why when the guest is
// enabling this bit, we first need to enable the MSI interrupts with
// VFIO through VFIO_DEVICE_SET_IRQS ioctl, and only after we can write
// to the device region to update the MSI Enable bit.
wrapper.write_config((reg + offset) as u32, data);
None
}
pub(crate) fn read_config_register(&mut self, reg_idx: usize, wrapper: &dyn Vfio) -> u32 {
// When reading the BARs, we trap it and return what comes
// from our local configuration space. We want the guest to
// use that and not the VFIO device BARs as it does not map
// with the guest address space.
if (PCI_CONFIG_BAR0_INDEX..PCI_CONFIG_BAR0_INDEX + BAR_NUMS).contains(&reg_idx)
|| reg_idx == PCI_ROM_EXP_BAR_INDEX
{
return self.configuration.read_reg(reg_idx);
}
// 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_HEADER_TYPE_REG_INDEX {
0xff7f_ffff
} else {
0xffff_ffff
};
// The config register read comes from the VFIO device itself.
wrapper.read_config_dword((reg_idx * 4) as u32) & mask
}
}
/// VfioPciDevice represents a VFIO PCI device.
@ -1150,85 +1231,13 @@ impl PciDevice for VfioPciDevice {
offset: u64,
data: &[u8],
) -> Option<Arc<Barrier>> {
// When the guest wants to write to a BAR, we trap it into
// our local configuration space. We're not reprogramming
// VFIO device.
if (PCI_CONFIG_BAR0_INDEX..PCI_CONFIG_BAR0_INDEX + BAR_NUMS).contains(&reg_idx)
|| reg_idx == PCI_ROM_EXP_BAR_INDEX
{
// We keep our local cache updated with the BARs.
// We'll read it back from there when the guest is asking
// for BARs (see read_config_register()).
self.common
.configuration
.write_config_register(reg_idx, offset, data);
return None;
}
let reg = (reg_idx * PCI_CONFIG_REGISTER_SIZE) as u64;
// If the MSI or MSI-X capabilities are accessed, we need to
// update our local cache accordingly.
// Depending on how the capabilities are modified, this could
// trigger a VFIO MSI or MSI-X toggle.
if let Some((cap_id, cap_base)) = self.common.interrupt.accessed(reg) {
let cap_offset: u64 = reg - cap_base + offset;
match cap_id {
PciCapabilityId::MessageSignalledInterrupts => {
if let Err(e) =
self.common
.update_msi_capabilities(cap_offset, data, &self.vfio_wrapper)
{
error!("Could not update MSI capabilities: {}", e);
}
}
PciCapabilityId::MsiX => {
if let Err(e) =
self.common
.update_msix_capabilities(cap_offset, data, &self.vfio_wrapper)
{
error!("Could not update MSI-X capabilities: {}", e);
}
}
_ => {}
}
}
// Make sure to write to the device's PCI config space after MSI/MSI-X
// interrupts have been enabled/disabled. In case of MSI, when the
// interrupts are enabled through VFIO (using VFIO_DEVICE_SET_IRQS),
// the MSI Enable bit in the MSI capability structure found in the PCI
// config space is disabled by default. That's why when the guest is
// enabling this bit, we first need to enable the MSI interrupts with
// VFIO through VFIO_DEVICE_SET_IRQS ioctl, and only after we can write
// to the device region to update the MSI Enable bit.
self.vfio_wrapper.write_config((reg + offset) as u32, data);
None
.write_config_register(reg_idx, offset, data, &self.vfio_wrapper)
}
fn read_config_register(&mut self, reg_idx: usize) -> u32 {
// When reading the BARs, we trap it and return what comes
// from our local configuration space. We want the guest to
// use that and not the VFIO device BARs as it does not map
// with the guest address space.
if (PCI_CONFIG_BAR0_INDEX..PCI_CONFIG_BAR0_INDEX + BAR_NUMS).contains(&reg_idx)
|| reg_idx == PCI_ROM_EXP_BAR_INDEX
{
return self.common.configuration.read_reg(reg_idx);
}
// 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_HEADER_TYPE_REG_INDEX {
0xff7f_ffff
} else {
0xffff_ffff
};
// The config register read comes from the VFIO device itself.
self.vfio_wrapper.read_config_dword((reg_idx * 4) as u32) & mask
self.common
.read_config_register(reg_idx, &self.vfio_wrapper)
}
fn detect_bar_reprogramming(