vmm: Use new Resource type PciBar

Instead of defining some very generic resources as PioAddressRange or
MmioAddressRange for each PCI BAR, let's move to the new Resource type
PciBar in order to make things clearer. This allows the code for being
more readable, but also removes the need for hard assumptions about the
MMIO and PIO ranges. PioAddressRange and MmioAddressRange types can be
used to describe everything except PCI BARs. BARs are very special as
they can be relocated and have special information we want to carry
along with them.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

pci/src/configuration.rs

@@ -9,6 +9,7 @@ use std::fmt::{self, Display};
 use std::sync::{Arc, Mutex};
 use versionize::{VersionMap, Versionize, VersionizeError, VersionizeResult};
 use versionize_derive::Versionize;
+use vm_device::PciBarType;
 use vm_migration::{MigratableError, Pausable, Snapshot, Snapshottable, VersionMapped};
 
 // The number of 32bit registers in the config space, 4096 bytes.
@@ -327,12 +328,43 @@ pub enum PciBarRegionType {
     Memory64BitRegion = 0x04,
 }
 
+impl From<PciBarType> for PciBarRegionType {
+    fn from(type_: PciBarType) -> Self {
+        match type_ {
+            PciBarType::Io => PciBarRegionType::IoRegion,
+            PciBarType::Mmio32 => PciBarRegionType::Memory32BitRegion,
+            PciBarType::Mmio64 => PciBarRegionType::Memory64BitRegion,
+        }
+    }
+}
+
+#[allow(clippy::from_over_into)]
+impl Into<PciBarType> for PciBarRegionType {
+    fn into(self) -> PciBarType {
+        match self {
+            PciBarRegionType::IoRegion => PciBarType::Io,
+            PciBarRegionType::Memory32BitRegion => PciBarType::Mmio32,
+            PciBarRegionType::Memory64BitRegion => PciBarType::Mmio64,
+        }
+    }
+}
+
 #[derive(Copy, Clone)]
 pub enum PciBarPrefetchable {
     NotPrefetchable = 0,
     Prefetchable = 0x08,
 }
 
+#[allow(clippy::from_over_into)]
+impl Into<bool> for PciBarPrefetchable {
+    fn into(self) -> bool {
+        match self {
+            PciBarPrefetchable::NotPrefetchable => false,
+            PciBarPrefetchable::Prefetchable => true,
+        }
+    }
+}
+
 #[derive(Copy, Clone)]
 pub struct PciBarConfiguration {
     addr: u64,
@@ -982,6 +1014,10 @@ impl PciBarConfiguration {
     pub fn region_type(&self) -> PciBarRegionType {
         self.region_type
     }
+
+    pub fn prefetchable(&self) -> PciBarPrefetchable {
+        self.prefetchable
+    }
 }
 
 #[cfg(test)]