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tests: Extend Windows guest CPU hotplug test and update doc

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Both changes aim to document the absence of the CPU hot-remove
functionality on Windows.

Closes #2457.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
This commit is contained in:
Anatol Belski 2021-04-07 14:38:37 +02:00 committed by Rob Bradford
parent e5211a6e1d
commit 3f5ecbd326
2 changed files with 22 additions and 1 deletions
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2
docs/windows.md
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@ -186,7 +186,7 @@ This allows for SSH login from a remote machine, for example through the `admini
## Hotplug capability
CPU hotplug is supported. The VM operating system needs to support hotplug and be appropriately licensed. SKU limitations like constraints on the number of cores are to be taken into consideration.
CPU hotplug is supported. The VM operating system needs to support hotplug and be appropriately licensed. SKU limitations like constraints on the number of cores are to be taken into consideration. Note, that Windows doesn't support CPU hot-remove. When `ch-remote` is invoked to reduce the number of CPUs, the result will be visible after the OS reboot within the same hypervisor instance.
## Debugging

21
tests/integration.rs
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@ -5784,6 +5784,27 @@ mod tests {
// Check the CH process has the correct number of vcpu threads
assert_eq!(get_vcpu_threads_count(child.id()), vcpu_num);
let vcpu_num = 4;
// Remove some CPUs. Note that Windows doesn't support hot-remove.
resize_command(&api_socket, Some(vcpu_num), None, None);
// Wait to make sure CPUs are removed
thread::sleep(std::time::Duration::new(10, 0));
// Reboot to let Windows catch up
ssh_command_ip_with_auth(
"shutdown /r /t 0",
&auth,
"192.168.249.2",
DEFAULT_SSH_RETRIES,
DEFAULT_SSH_TIMEOUT,
)
.unwrap();
// Wait to make sure Windows completely rebooted
thread::sleep(std::time::Duration::new(60, 0));
// Check the guest sees the correct number
assert_eq!(get_cpu_count_windows(&auth), vcpu_num);
// Check the CH process has the correct number of vcpu threads
assert_eq!(get_vcpu_threads_count(child.id()), vcpu_num);
ssh_command_ip_with_auth(
"shutdown /s",
&auth,