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arch: Add SubRegion memory type

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We want to be able to differentiate between memory regions that must be
managed separately from the main address space (e.g. the 32-bit memory
hole) and ones that are reserved (i.e. from which we don't want to allow
the VMM to allocate address ranges.

We are going to use a reserved memory region for restricting the 32-bit
memory hole from expanding beyond the IOAPIC and TSS addresses.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz
2019-07-25 10:20:59 +02:00
committed by Rob Bradford
parent 792cc27435
commit 299d887856
3 changed files with 20 additions and 6 deletions
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9
vmm/src/vm.rs
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@@ -1232,7 +1232,12 @@ impl<'a> Vm<'a> {
.filter(|r| r.2 == RegionType::Ram)
.map(|r| (r.0, r.1))
.collect();
let reserved_regions: Vec<(GuestAddress, usize)> = arch_mem_regions
let sub_regions: Vec<(GuestAddress, usize)> = arch_mem_regions
.iter()
.filter(|r| r.2 == RegionType::SubRegion)
.map(|r| (r.0, r.1))
.collect();
let _reserved_regions: Vec<(GuestAddress, usize)> = arch_mem_regions
.iter()
.filter(|r| r.2 == RegionType::Reserved)
.map(|r| (r.0, r.1))
@@ -1241,7 +1246,7 @@ impl<'a> Vm<'a> {
// Check the number of reserved regions, and only take the first one
// that's acrtually a 32-bit hole.
let mut mem_hole = (GuestAddress(0), 0);
for region in reserved_regions.iter() {
for region in sub_regions.iter() {
if region.0.unchecked_add(region.1 as u64).raw_value() <= 0x1_0000_0000 {
mem_hole = (region.0, region.1);
break;