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nixos/vms: Add more parameters for PCIe passthrough

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This commit is contained in:
Jack O'Sullivan 2022-06-30 00:50:50 +01:00
parent 8ec6804f80
commit 0310da9227
2 changed files with 16 additions and 8 deletions
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10
nixos/boxes/colony/vms/default.nix
View File

@ -9,9 +9,6 @@
inherit (builtins) listToAttrs;
inherit (lib) mkIf mkMerge optionals;
wanBDF =
if config.my.build.isDevVM then "00:02.0" else "27:00.0";
vmLVM = vm: lv: {
name = lv;
backend = {
@ -62,7 +59,12 @@
(vmLVM "estuary" "nix")
(vmLVM "estuary" "persist")
]);
hostDevices."${wanBDF}" = { };
hostDevices = {
net-wan0 = {
index = 0;
hostBDF = if config.my.build.isDevVM then "00:02.0" else "27:00.0";
};
};
};
shill = {

14
nixos/modules/vms.nix
View File

@ -95,7 +95,10 @@ let
hostDevOpts = with lib.types; {
options = {
index = mkOpt' ints.unsigned null "Index of device in guest (for root port chassis and slot).";
hostBDF = mkOpt' str null "PCI BDF of host device.";
bindVFIO = mkBoolOpt' true "Whether to automatically bind the device to vfio-pci.";
extraOptions = mkOpt' qemuOpts { } "Extra QEMU options for the vfio-pci QEMU device.";
};
};
@ -137,7 +140,7 @@ let
allHostDevs =
flatten
(map
(i: mapAttrsToList (bdf: c: { inherit bdf; inherit (c) bindVFIO; }) i.hostDevices)
(i: mapAttrsToList (name: c: c // { inherit name; }) i.hostDevices)
(attrValues cfg.instances));
mkQemuScript = n: i:
@ -176,7 +179,10 @@ let
"blockdev node-name=${d.name}-format,${d.formatBackendProp}=${d.name}-backend,${d.format}"
("device ${d.frontend},id=${d.name},drive=${d.name}-format" + (extraQEMUOpts d.frontendOpts))
]) i.drives)) ++
(map (bdf: "device vfio-pci,host=${bdf}") (attrNames i.hostDevices));
(flatten (mapAttrsToList (id: c: [
"device pcie-root-port,id=${id}-port,chassis=${toString c.index},port=${toString c.index}"
("device vfio-pci,bus=${id}-port,host=${c.hostBDF}" + (extraQEMUOpts c.extraOptions))
]) i.hostDevices));
args = map (v: "-${v}") flags;
in
''
@ -193,7 +199,7 @@ in
config = mkIf (cfg.instances != { }) {
assertions = [
{
assertion = let bdfs = map (d: d.bdf) allHostDevs; in (unique bdfs) == bdfs;
assertion = let bdfs = map (d: d.hostBDF) allHostDevs; in (unique bdfs) == bdfs;
message = "VMs cannot share host devices!";
}
];
@ -215,7 +221,7 @@ in
"etc/udev/rules.d/20-vfio-tags.rules"
(concatMapStringsSep
"\n"
(d: ''ACTION=="add", SUBSYSTEM=="pci", KERNEL=="0000:${d.bdf}", TAG="vfio-pci-bind"'')
(d: ''ACTION=="add", SUBSYSTEM=="pci", KERNEL=="0000:${d.hostBDF}", TAG="vfio-pci-bind"'')
(filter (d: d.bindVFIO) allHostDevs)))
];
};