On Tue, 9 Aug 2022 13:48:16 +0100, Suzuki K Poulose wrote:
> When a script is specified for a guest nic setup, we fork() and execl()s
> the script when it is time to execute the script. However this is not
> optimal, given we are running a VM. The fork() will trigger marking the
> entire page-table of the current process as CoW, which will trigger
> unmapping the entire stage2 page tables from the guest. Anyway, the
> child process will exec the script as soon as we fork(), making all
> these mm operations moot. Also, this operation could be problematic
> for confidential compute VMs, where it may be expensive (and sometimes
> destructive) to make changes to the stage2 page tables.
>
> [...]
Applied to kvmtool (master), thanks!
[1/1] net: Use vfork() instead of fork() for script execution
https://git.kernel.org/will/kvmtool/c/9987a37cfc57
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
