TDX: Remove RwLock on tlb flush state tracking to allow reads to interleave with a single write #1358
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This reverts commit 3a17b30.
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This is based on the legacy HCL's, but slightly modified to fit our slightly different organization. Tested that a 128 VP TDX VM with VSM still boots and shuts down cleanly.
Closes #699 together with #1325.