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file-restore: support more drives

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A PCI bus can only support up to 32 devices, so excluding built-in
devices that left us with a maximum of about 25 drives. By adding a new
PCI bridge every 32 devices (starting at bridge ID 2 to avoid conflicts
with automatic bridges), we can theoretically support up to 8096 drives.

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
This commit is contained in:
Stefan Reiter 2021-05-06 17:26:19 +02:00 committed by Thomas Lamprecht
parent 61c4087041
commit 936eceda61
1 changed files with 12 additions and 1 deletions
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13
src/bin/proxmox_file_restore/qemu_helper.rs
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@ -197,10 +197,21 @@ pub async fn start_vm(
"file=pbs:repository={},,snapshot={},,archive={}{},read-only=on,if=none,id=drive{}",
details.repo, details.snapshot, file, keyfile, id
));
// a PCI bus can only support 32 devices, so add a new one every 32
let bus = (id / 32) + 2;
if id % 32 == 0 {
drives.push("-device".to_owned());
drives.push(format!("pci-bridge,id=bridge{},chassis_nr={}", bus, bus));
}
drives.push("-device".to_owned());
// drive serial is used by VM to map .fidx files to /dev paths
let serial = file.strip_suffix(".img.fidx").unwrap_or(&file);
drives.push(format!("virtio-blk-pci,drive=drive{},serial={}", id, serial));
drives.push(format!(
"virtio-blk-pci,drive=drive{},serial={},bus=bridge{}",
id, serial, bus
));
id += 1;
}