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vm-device, pci, devices: Remove InterruptSourceGroup::{un}mask

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The calls to these functions are always preceded by a call to
InterruptSourceGroup::update(). By adding a masked boolean to that
function call it possible to remove 50% of the calls to the
KVM_SET_GSI_ROUTING ioctl as the the update will correctly handle the
masked or unmasked case.

This causes the ioctl to disappear from the perf report for a boot of
the VM.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford
2022-04-11 16:21:20 +01:00
parent 6a099257e8
commit ed87e42e6f
10 changed files with 52 additions and 105 deletions
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17
pci/src/msi.rs
View File

@@ -201,20 +201,13 @@ impl MsiConfig {
devid: 0,
};
if let Err(e) = self
.interrupt_source_group
.update(idx as InterruptIndex, InterruptSourceConfig::MsiIrq(config))
{
if let Err(e) = self.interrupt_source_group.update(
idx as InterruptIndex,
InterruptSourceConfig::MsiIrq(config),
self.cap.vector_masked(idx),
) {
error!("Failed updating vector: {:?}", e);
}
if self.cap.vector_masked(idx) {
if let Err(e) = self.interrupt_source_group.mask(idx as InterruptIndex) {
error!("Failed masking vector: {:?}", e);
}
} else if let Err(e) = self.interrupt_source_group.unmask(idx as InterruptIndex) {
error!("Failed unmasking vector: {:?}", e);
}
}
if !old_enabled {