diff options
| -rw-r--r-- | pkg/sentry/platform/kvm/physical_map.go | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/pkg/sentry/platform/kvm/physical_map.go b/pkg/sentry/platform/kvm/physical_map.go index b908cae6a..9d7dca5b3 100644 --- a/pkg/sentry/platform/kvm/physical_map.go +++ b/pkg/sentry/platform/kvm/physical_map.go @@ -50,8 +50,9 @@ type physicalRegion struct { var physicalRegions []physicalRegion // fillAddressSpace fills the host address space with PROT_NONE mappings until -// the number of available bits until we have a host address space size that is -// equal to the physical address space. +// we have a host address space size that is less than or equal to the physical +// address space. This allows us to have an injective host virtual to guest +// physical mapping. // // The excluded regions are returned. func fillAddressSpace() (excludedRegions []region) { @@ -67,11 +68,6 @@ func fillAddressSpace() (excludedRegions []region) { pSize := uintptr(1) << ring0.PhysicalAddressBits() pSize -= reservedMemory - // Sanity check. - if vSize < pSize { - panic(fmt.Sprintf("vSize (%x) < pSize (%x)", vSize, pSize)) - } - // Add specifically excluded regions; see excludeVirtualRegion. applyVirtualRegions(func(vr virtualRegion) { if excludeVirtualRegion(vr) { @@ -81,6 +77,11 @@ func fillAddressSpace() (excludedRegions []region) { } }) + // Do we need any more work? + if vSize < pSize { + return excludedRegions + } + // Calculate the required space and fill it. // // Note carefully that we add faultBlockSize to required up front, and |