Intel TDX Doesn't Need So Much Cache Flushing
Intel Trust Domain Extensions (TDX) are used for confidential computing with VMs. Previously, it was assumed that cache flushing was necessary when transitioning memory between KeyIDs used for unique AES encryption keys.
Summary: Intel Trust Domain Extensions (TDX) are used for confidential computing with VMs. Previously, it was assumed that cache flushing was necessary when transitioning memory between KeyIDs used for unique AES encryption keys.
Intel Trust Domain Extensions (TDX) is a technology aimed at providing confidential computing for virtual machines (VMs). This technology protects sensitive data by encrypting VM memory at the hardware level. Previously, extensive cache flushing operations were thought to be necessary when transitioning memory between different encryption keys (KeyIDs).
New studies indicate that Intel TDX does not require as much intensive cache flushing as previously assumed. This finding could lead to performance improvements, especially during transitions between unique AES encryption keys used by total memory encryption (MKTME). Less cache flushing translates to savings in CPU cycles.
From a live systems and infrastructure perspective, this discovery could bring significant performance gains. In confidential computing environments, cache flushing operations could previously create a substantial performance bottleneck. With this optimization, VMs utilizing TDX will be able to operate more efficiently with I/O and memory-intensive workloads, potentially increasing overall system throughput.
For kernel and virtualization engineers, this presents an opportunity to re-evaluate TDX integrations and performance tuning. The reduced cache flushing requirement holds the potential to increase virtual machine densities or run sensitive workloads with lower latency.
🔗 Source: Phoronix Hardware
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