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vmm: [snapshot] MTRR should be saved/restored
Ubuntu 22.04 (Linux 5.15.0-84-generic) gets panic (hangs) if do: 1. Snapshot VM while it is in GRUB menu 2. Resume 3. Boot Linux. Linux dmesg: total RAM covered: 1M gran_size: 64K chunk_size: 64K num_reg: 4 lose cover RAM: 92K ... mtrr_cleanup: can not find optimal value please specify mtrr_gran_size/mtrr_chunk_size WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 510MB of RAM. WARNING: CPU: 0 PID: 0 at arch/x86/kernel/cpu/mtrr/cleanup.c:978 mtrr_trim_uncached_memory+0x426/0x469 ... BUG: unable to handle page fault for address: ffff9d0047e15ff8 - Adding MTTR increases kernel dump size for 256 bytes per vCPU: - Sponsored by: vStack Differential Revision: https://reviews.freebsd.org/D43226
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