[PATCH qemu-server v3 1/2] pci: factor 'prepare_pci_devices' out to PVE::QemuServer::PCI module

[Dominik Csapak <d.csapak@proxmox.com>]

only slight change to the logic here was to return a uuid from an mdev
in any case if we need it, and overwrite it in vm_start_nolock with
the one from smbios1 if possible, instead of doing it the other way
round.

This was necessary since we don't have access to parse_smbios1 in the
PCI module.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
---
 src/PVE/QemuServer.pm     | 45 +++++++--------------------------------
 src/PVE/QemuServer/PCI.pm | 45 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 37 deletions(-)

diff --git a/src/PVE/QemuServer.pm b/src/PVE/QemuServer.pm
index 545758dc..73328460 100644
--- a/src/PVE/QemuServer.pm
+++ b/src/PVE/QemuServer.pm
@@ -5629,45 +5629,16 @@ sub vm_start_nolock {
 
         push $cmd->@*, $state_cmdline->@*;
 
-        for my $device (values $pci_devices->%*) {
-            next if $device->{mdev}; # we don't reserve for mdev devices
-            push $pci_reserve_list->@*, map { $_->{id} } $device->{ids}->@*;
-        }
-
-        # reserve all PCI IDs before actually doing anything with them
-        PVE::QemuServer::PCI::reserve_pci_usage($pci_reserve_list, $vmid, $start_timeout);
-
-        my $uuid;
-        for my $id (sort keys %$pci_devices) {
-            my $d = $pci_devices->{$id};
-            my ($index) = ($id =~ m/^hostpci(\d+)$/);
-
-            my $chosen_mdev;
-            for my $dev ($d->{ids}->@*) {
-                my $info =
-                    eval { PVE::QemuServer::PCI::prepare_pci_device($vmid, $dev->{id}, $index, $d) };
-                if ($d->{mdev} || $d->{nvidia}) {
-                    warn $@ if $@;
-                    $chosen_mdev = $info;
-                    last if $chosen_mdev; # if successful, we're done
-                } else {
-                    die $@ if $@;
-                }
-            }
-
-            next if !$d->{mdev} && !$d->{nvidia};
-            die "could not create mediated device\n" if !defined($chosen_mdev);
+        ($pci_reserve_list, my $uuid) =
+            PVE::QemuServer::PCI::prepare_pci_devices($conf, $vmid, $pci_devices, $start_timeout);
 
-            # nvidia grid needs the uuid of the mdev as qemu parameter
-            if (!defined($uuid) && $chosen_mdev->{vendor} =~ m/^(0x)?10de$/) {
-                if (defined($conf->{smbios1})) {
-                    my $smbios_conf = parse_smbios1($conf->{smbios1});
-                    $uuid = $smbios_conf->{uuid} if defined($smbios_conf->{uuid});
-                }
-                $uuid = PVE::QemuServer::PCI::generate_mdev_uuid($vmid, $index)
-                    if !defined($uuid);
-            }
+        # uuid for nvidia vgpu
+        # prefer the smbios1 uuid if we have and need it
+        if (defined($uuid) && defined($conf->{smbios1})) {
+            my $smbios_conf = parse_smbios1($conf->{smbios1});
+            $uuid = $smbios_conf->{uuid} if defined($smbios_conf->{uuid});
         }
+
         push @$cmd, '-uuid', $uuid if defined($uuid);
     };
     if (my $err = $@) {
diff --git a/src/PVE/QemuServer/PCI.pm b/src/PVE/QemuServer/PCI.pm
index c9cf8de0..f778c60f 100644
--- a/src/PVE/QemuServer/PCI.pm
+++ b/src/PVE/QemuServer/PCI.pm
@@ -736,6 +736,51 @@ sub print_hostpci_devices {
     return ($kvm_off, $gpu_passthrough, $legacy_igd, $pci_devices);
 }
 
+sub prepare_pci_devices {
+    my ($conf, $vmid, $pci_devices, $start_timeout) = @_;
+
+    my $pci_reserve_list = [];
+    my $uuid;
+
+    for my $device (values $pci_devices->%*) {
+        next if $device->{mdev}; # we don't reserve for mdev devices
+        push $pci_reserve_list->@*, map { $_->{id} } $device->{ids}->@*;
+    }
+
+    # reserve all PCI IDs before actually doing anything with them
+    reserve_pci_usage($pci_reserve_list, $vmid, $start_timeout);
+
+    for my $id (sort keys %$pci_devices) {
+        my $d = $pci_devices->{$id};
+        my ($index) = ($id =~ m/^hostpci(\d+)$/);
+
+        my $chosen_mdev;
+        for my $dev ($d->{ids}->@*) {
+            my $info =
+                eval { prepare_pci_device($vmid, $dev->{id}, $index, $d) };
+            if ($d->{mdev} || $d->{nvidia}) {
+                warn $@ if $@;
+                $chosen_mdev = $info;
+                last if $chosen_mdev; # if successful, we're done
+            } else {
+                die $@ if $@;
+            }
+        }
+
+        next if !$d->{mdev} && !$d->{nvidia};
+        die "could not create mediated device\n" if !defined($chosen_mdev);
+
+        # nvidia vgpu need a uuid parameter, we want the smbios one but we can't parse
+        # that here, so returnt any mdev uuid to signal we want one and as a fallback,
+        # in case there is not smbios uuid
+        if (!defined($uuid) && $chosen_mdev->{vendor} =~ m/^(0x)?10de$/) {
+            $uuid = generate_mdev_uuid($vmid, $index) if !defined($uuid);
+        }
+    }
+
+    return ($pci_reserve_list, $uuid);
+}
+
 sub prepare_pci_device {
     my ($vmid, $pciid, $index, $device) = @_;
 
-- 
2.47.3