Generate and expose the DSDT table entries required to support memory
hotplug. The AML methods call into the MemoryManager via I/O ports
exposed as fields.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Expose the details of hotplug RAM slots via an I/O port. This will be
consumed by the ACPI DSDT tables to report the hotplug memory details to
the guest.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Add a "resize()" method on MemoryManager which will create a new memory
allocation based on the difference between the desired RAM amount and
the amount already in use. After allocating the added RAM using the same
backing method as the boot RAM store the details in a vector and update
the KVM map and create a new GuestMemoryMmap and replace all the users.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This specifies how much address space should be reserved for hotplugging
of RAM. This space is reserved by adding move the start of the device
area by the desired amount.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Make the GuestMemoryMmap from a Vec<Arc<GuestRegionMmap>> by using this
method we can persist a set of regions in the MemoryManager and then
extend this set with a newly created region. Ultimately that will allow
the hotplug of memory.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This allows us to change the memory map that is being used by the
devices via an atomic swap (by replacing the map with another one). The
ArcSwap provides the mechanism for atomically swapping from to another
whilst still giving good read performace. It is inside an Arc so that we
can use a single ArcSwap for all users.
Not covered by this change is replacing the GuestMemoryMmap itself.
This change also removes some vertical whitespace from use blocks in the
files that this commit also changed. Vertical whitespace was being used
inconsistently and broke rustfmt's behaviour of ordering the imports as
it would only do it within the block.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This function will be useful for other parts of the VMM that also
estabilish their own mappings.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This removes the need to handle a mutable integer and also centralises
the allocation of these slot numbers.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
The memory manager is responsible for setting up the guest memory and in
the long term will also handle addition of guest memory.
In this commit move code for creating the backing memory and populating
the allocator into the new implementation trying to make as minimal
changes to other code as possible.
Follow on commits will further reduce some of the duplicated code.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
