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vmm: Reject memory resizing on TDX

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This is similar to the dynamic concept used in CpuManager.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2022-03-23 15:48:38 +00:00
parent 8dda052c7d
commit bbf7fd5372
1 changed files with 12 additions and 3 deletions
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15
vmm/src/memory_manager.rs
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@ -172,6 +172,7 @@ pub struct MemoryManager {
log_dirty: bool, // Enable dirty logging for created RAM regions
arch_mem_regions: Vec<ArchMemRegion>,
ram_allocator: AddressAllocator,
dynamic: bool,
// Keep track of calls to create_userspace_mapping() for guest RAM.
// This is useful for getting the dirty pages as we need to know the
@ -309,6 +310,9 @@ pub enum Error {
/// Failed to allocate MMIO address
AllocateMmioAddress,
/// Memory resizing not supported
ResizingNotSupported,
}
const ENABLE_FLAG: usize = 0;
@ -1028,9 +1032,9 @@ impl MemoryManager {
.ok_or(Error::AllocateMmioAddress)?;
#[cfg(not(feature = "tdx"))]
let log_dirty = true;
let dynamic = true;
#[cfg(feature = "tdx")]
let log_dirty = !tdx_enabled; // Cannot log dirty pages on a TD
let dynamic = !tdx_enabled;
// If running on SGX the start of device area and RAM area may diverge but
// at this point they are next to each other.
@ -1065,9 +1069,10 @@ impl MemoryManager {
guest_ram_mappings: Vec::new(),
#[cfg(feature = "acpi")]
acpi_address,
log_dirty,
log_dirty: dynamic, // Cannot log dirty pages on a TD
arch_mem_regions,
ram_allocator,
dynamic,
};
memory_manager.allocate_address_space()?;
@ -1596,6 +1601,10 @@ impl MemoryManager {
/// use case never adds a new region as the whole hotpluggable memory has
/// already been allocated at boot time.
pub fn resize(&mut self, desired_ram: u64) -> Result<Option<Arc<GuestRegionMmap>>, Error> {
if !self.dynamic {
return Err(Error::ResizingNotSupported);
}
if self.user_provided_zones {
error!(
"Not allowed to resize guest memory when backed with user \