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docs: add slot when adding new PCIe root port

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Without providing a specific slot, QEMU won't be able to create the
second additional PCIe root port with the following error:

    $ qemu-system-x86_64 [...] -machine q35 \
    >    -device pcie-root-port,bus=pcie.0,id=rp1 \
    >    -device pcie-root-port,bus=pcie.0,id=rp2
    qemu-system-x86_64: -device pcie-root-port,bus=pcie.0,id=rp2:
    Can't add chassis slot, error -16

This is due to the fact they both try to use slot 0. Update the
documentation to specify a slot for each new PCIe root port.

Signed-off-by: Vincent Bernat <vincent@bernat.ch>
Message-Id: <20210614114357.1146725-1-vincent@bernat.ch>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Vincent Bernat 2021-06-14 13:43:57 +02:00 committed by Michael S. Tsirkin
parent ee80f5ba22
commit 9e2423ef58
1 changed files with 3 additions and 3 deletions
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6
docs/pcie_pci_bridge.txt
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@ -70,9 +70,9 @@ A detailed command line would be:
[qemu-bin + storage options] \
-m 2G \
-device pcie-root-port,bus=pcie.0,id=rp1 \
-device pcie-root-port,bus=pcie.0,id=rp2 \
-device pcie-root-port,bus=pcie.0,id=rp3,bus-reserve=1 \
-device pcie-root-port,bus=pcie.0,id=rp1,slot=1 \
-device pcie-root-port,bus=pcie.0,id=rp2,slot=2 \
-device pcie-root-port,bus=pcie.0,id=rp3,slot=3,bus-reserve=1 \
-device pcie-pci-bridge,id=br1,bus=rp1 \
-device pcie-pci-bridge,id=br2,bus=rp2 \
-device e1000,bus=br1,addr=8