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vm-migration: Update protocol for FD based live migration

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Signed-off-by: Rob Bradford <robert.bradford@intel.com>
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Rob Bradford 2022-01-17 16:40:01 +00:00
parent cb243571de
commit 33fd0af8b3
1 changed files with 18 additions and 1 deletions
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19
vm-migration/src/protocol.rs
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@ -27,7 +27,24 @@ use vm_memory::ByteValued;
// (n-2): Dest -> Source : sends "ok response"
// (n-1): Source -> Dest : send "complete command"
// n: Dest -> Source: sends "ok response"
//
// "Local version": (Handing FDs across socket for memory)
// 1: Source establishes communication with destination (file socket or TCP connection.)
// (The establishment is out of scope.)
// 2: Source -> Dest : send "start command"
// 3: Dest -> Source : sends "ok response" when read to accept state data
// 4: Source -> Dest : sends "config command" followed by config data, length
// in command is length of config data
// 5: Dest -> Source : sends "ok response" when ready to accept memory data
// 6: Source -> Dest : send "memory fd command" followed by u16 slot ID and FD for memory
// 7: Dest -> Source : sends "ok response" when received
// 8..(n-4): Repeat steps 6 and 7 until source has no more memory to send
// (n-3): Source -> Dest : sends "state command" followed by state data, length
// in command is length of config data
// (n-2): Dest -> Source : sends "ok response"
// (n-1): Source -> Dest : send "complete command"
// n: Dest -> Source: sends "ok response"
//
// The destination can at any time send an "error response" to cancel
// The source can at any time send an "abandon request" to cancel