[PATCH qemu-server v4 6/7] pci: call hookscript for each prepared pci device

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

There are situations where a user might want to do extra things
for a passed through PCI device after it has been prepared/created (e.g.
in case of vGPU/mdev) but before the actual QEMU process is started.

Two examples are (both are used with NVIDIA vGPUs):
* setting 'vgpu_params' such as removing the frame-rate-limiter
* setting the gpu_instance_id for MIG devices

So instead of creating (nvidia-specific) interfaces for these, give a
user the ability to do it themselves via the hookscript as a first step.

Call it for each prepared device, so that we can give the hookscript the
'hostpciX' id, and the used uuid (in case of mdevs) or the pci id (in
case of regular or modern vGPU passthrough).

A failing hookscript aborts, and blocks the VM start.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
---
 src/PVE/QemuServer/PCI.pm | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/PVE/QemuServer/PCI.pm b/src/PVE/QemuServer/PCI.pm
index 5d2fdabb..755945a9 100644
--- a/src/PVE/QemuServer/PCI.pm
+++ b/src/PVE/QemuServer/PCI.pm
@@ -5,6 +5,7 @@ use strict;
 
 use IO::File;
 
+use PVE::GuestHelpers;
 use PVE::JSONSchema;
 use PVE::Mapping::PCI;
 use PVE::SysFSTools;
@@ -728,10 +729,17 @@ sub prepare_pci_devices {
             if ($d->{mdev} || $d->{nvidia}) {
                 warn $@ if $@;
                 $chosen_mdev = $info;
-                last if $chosen_mdev; # if successful, we're done
             } else {
                 die $@ if $@;
             }
+
+            next if !defined($info);
+
+            my $params = { id => $id, pciid => $info->{name} };
+            $params->{mdev_uuid} = $info->{uuid} if defined($info->{uuid});
+            PVE::GuestHelpers::exec_hookscript($conf, $vmid, 'post-pci-prepare', 1, $params);
+
+            last if defined($chosen_mdev);
         }
 
         next if !$d->{mdev} && !$d->{nvidia};
-- 
2.47.3