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fix #3258: block vm start when pci device is already in use

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on vm start, we reserve all pciids that we use, and
remove the reservation again in vm_stop_cleanup

first with only a time-based reservation but after the vm is started,
we reserve again but with the pid.

for this, we have to move the start_timeout calculation above the
hostpci handling.

also moved the pci initialization out of the conf parsing loop
so that we can reserve all ids before we actually touch any of them

while touching the lines, fix the indentation

this way, when a vm starts with a pci device that is already configured
for a different running vm, will not be started and the user gets
the error that the device is already in use

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
This commit is contained in:
Dominik Csapak 2021-10-07 15:45:31 +02:00 committed by Thomas Lamprecht
parent a01593676c
commit 1fb1822ec9
1 changed files with 33 additions and 7 deletions
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38
PVE/QemuServer.pm
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@ -5381,13 +5381,30 @@ sub vm_start_nolock {
push @$cmd, '-S';
}
# host pci devices
my $start_timeout = $params->{timeout} // config_aware_timeout($conf, $resume);
my $pci_devices = {}; # host pci devices
for (my $i = 0; $i < $PVE::QemuServer::PCI::MAX_HOSTPCI_DEVICES; $i++) {
my $d = parse_hostpci($conf->{"hostpci$i"});
next if !$d;
for my $pcidevice ($d->{pciid}->@*) {
PVE::QemuServer::PCI::prepare_pci_device($vmid, $pcidevice->{id}, $i, $d->{mdev});
my $dev = $conf->{"hostpci$i"} or next;
$pci_devices->{$i} = parse_hostpci($dev);
}
my $pci_id_list = [ map { $_->{id} } map { $_->{pciid}->@* } values $pci_devices->%* ];
# reserve all PCI IDs before actually doing anything with them
PVE::QemuServer::PCI::reserve_pci_usage($pci_id_list, $vmid, $start_timeout);
eval {
for my $id (sort keys %$pci_devices) {
my $d = $pci_devices->{$id};
for my $dev ($d->{pciid}->@*) {
PVE::QemuServer::PCI::prepare_pci_device($vmid, $dev->{id}, $id, $d->{mdev});
}
}
};
if (my $err = $@) {
eval { PVE::QemuServer::PCI::remove_pci_reservation($pci_id_list) };
warn $@ if $@;
die $err;
}
PVE::Storage::activate_volumes($storecfg, $vollist);
@ -5402,7 +5419,6 @@ sub vm_start_nolock {
my $cpuunits = get_cpuunits($conf);
my $start_timeout = $params->{timeout} // config_aware_timeout($conf, $resume);
my %run_params = (
timeout => $statefile ? undef : $start_timeout,
umask => 0077,
@ -5482,9 +5498,16 @@ sub vm_start_nolock {
if (my $err = $@) {
# deactivate volumes if start fails
eval { PVE::Storage::deactivate_volumes($storecfg, $vollist); };
eval { PVE::QemuServer::PCI::remove_pci_reservation($pci_id_list) };
die "start failed: $err";
}
# re-reserve all PCI IDs now that we can know the actual VM PID
my $pid = PVE::QemuServer::Helpers::vm_running_locally($vmid);
eval { PVE::QemuServer::PCI::reserve_pci_usage($pci_id_list, $vmid, undef, $pid) };
warn $@ if $@;
print "migration listens on $migrate_uri\n" if $migrate_uri;
$res->{migrate_uri} = $migrate_uri;
@ -5673,6 +5696,7 @@ sub vm_stop_cleanup {
unlink '/dev/shm/pve-shm-' . ($ivshmem->{name} // $vmid);
}
my $ids = [];
foreach my $key (keys %$conf) {
next if $key !~ m/^hostpci(\d+)$/;
my $hostpciindex = $1;
@ -5681,9 +5705,11 @@ sub vm_stop_cleanup {
foreach my $pci (@{$d->{pciid}}) {
my $pciid = $pci->{id};
push @$ids, $pci->{id};
PVE::SysFSTools::pci_cleanup_mdev_device($pciid, $uuid);
}
}
PVE::QemuServer::PCI::remove_pci_reservation($ids);
vmconfig_apply_pending($vmid, $conf, $storecfg) if $apply_pending_changes;
};