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fix: pass only the gpu's iommu group and audio, not sibling psp/usb

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Sandwich
2026-09-06 08:56:27 +02:00
parent f90745e68e
commit 1e1078e16a
1 changed files with 21 additions and 3 deletions
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24
scripts/gpu-passthrough.sh
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@@ -57,6 +57,24 @@ group_members() {
done done
} }
# The functions to hand to the guest with GPU $1: every device in its IOMMU group
# (mandatory for vfio), plus any sibling function of the same PCI device that is
# itself a display or HDMI/DP audio controller. An APU parks its PSP and USB
# controllers on the same PCI device in separate IOMMU groups - those are the
# host's, so siblings are filtered by class and never pulled in blindly.
passthrough_devs() {
local d="$1" m cls
{
group_members "$d"
for m in "/sys/bus/pci/devices/${d%.*}".*; do
[ -e "$m" ] || continue
m=$(basename "$m")
cls=$(cat "/sys/bus/pci/devices/$m/class" 2>/dev/null)
case "$cls" in 0x03*|0x0403*) echo "$m";; esac
done
} | sort -u
}
driver_of() { driver_of() {
local l local l
l=$(readlink -f "/sys/bus/pci/devices/$1/driver" 2>/dev/null) l=$(readlink -f "/sys/bus/pci/devices/$1/driver" 2>/dev/null)
@@ -79,7 +97,7 @@ drives_display() {
ids_of() { # vendor:device for vfio-pci binding ids_of() { # vendor:device for vfio-pci binding
local d local d
for d in $(group_members "$1"); do for d in $(passthrough_devs "$1"); do
local cls; cls=$(cat "/sys/bus/pci/devices/$d/class" 2>/dev/null) local cls; cls=$(cat "/sys/bus/pci/devices/$d/class" 2>/dev/null)
# only real functions of the card: skip bridges (class 0x0604xx) # only real functions of the card: skip bridges (class 0x0604xx)
case "$cls" in 0x0604*) continue;; esac case "$cls" in 0x0604*) continue;; esac
@@ -303,7 +321,7 @@ apply() {
"$v" -c qemu:///system dumpxml --inactive "$dom" > "$backup/$dom.gpu-current.xml" "$v" -c qemu:///system dumpxml --inactive "$dom" > "$backup/$dom.gpu-current.xml"
grep -q 'ua-vfionative-gpu' "$backup/$dom.gpu-current.xml" || cp "$backup/$dom.gpu-current.xml" "$backup/$dom.before-gpu.xml" grep -q 'ua-vfionative-gpu' "$backup/$dom.gpu-current.xml" || cp "$backup/$dom.gpu-current.xml" "$backup/$dom.before-gpu.xml"
local devs="" m local devs="" m
for m in $( { group_members "$d"; ls -d "/sys/bus/pci/devices/${d%.*}".* | xargs -n1 basename; } | sort -u); do for m in $(passthrough_devs "$d"); do
case "$(cat "/sys/bus/pci/devices/$m/class" 2>/dev/null)" in 0x0604*) continue;; esac case "$(cat "/sys/bus/pci/devices/$m/class" 2>/dev/null)" in 0x0604*) continue;; esac
IFS=':.' read -r dm bs sl fn <<< "$m" IFS=':.' read -r dm bs sl fn <<< "$m"
devs+=" <hostdev mode='subsystem' type='pci' managed='yes'>\n <source>\n" devs+=" <hostdev mode='subsystem' type='pci' managed='yes'>\n <source>\n"
@@ -330,7 +348,7 @@ xml() {
echo "Add this to the domain, inside <devices>. Every device in the GPU's" echo "Add this to the domain, inside <devices>. Every device in the GPU's"
echo "IOMMU group has to go together:" echo "IOMMU group has to go together:"
echo echo
for m in $(group_members "$d"); do for m in $(passthrough_devs "$d"); do
local cls; cls=$(cat "/sys/bus/pci/devices/$m/class" 2>/dev/null) local cls; cls=$(cat "/sys/bus/pci/devices/$m/class" 2>/dev/null)
case "$cls" in 0x0604*) continue;; esac case "$cls" in 0x0604*) continue;; esac
IFS=':. ' read -r dom bus slot fn <<< "$(echo "$m" | tr ':.' ' ')" IFS=':. ' read -r dom bus slot fn <<< "$(echo "$m" | tr ':.' ' ')"