If you're encountering I/O timeout errors on your Confidential VM instance, latency might be exceeding the default timeout parameter for I/O operations submitted to NVMe devices.
To increase the timeout parameter, add the following lines to the
/lib/udev/rules.d/65-gce-disk-naming.rules file on your VM, and then reboot:
KERNEL=="nvme*n*", ENV{DEVTYPE}=="disk", ATTRS{model}=="nvme_card-pd",
ATTR{queue/io_timeout}="4294967295"