53 lines
2.5 KiB
Diff
53 lines
2.5 KiB
Diff
qemu-spoof: OEM-brand emulated PCI subsystem ids (realize-time)
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QEMU stamps a constant subsystem id (default 1b36:1100) on every emulated PCI
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device -- a fleet fingerprint. The subsystem id is not used for guest driver
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binding, so override it at realize time with an OEM-branded SVID/SSID (chipset
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vendor + per-role device id) for non-bridge devices. Red Hat/virtio (0x1af4) is
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skipped: legacy-virtio encodes the device type in the subsystem id, so changing
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it would break the guest driver (virtio is de-fingerprinted by device choice
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instead). vfio passthrough overwrites this with the real hardware SSID afterwards.
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This is the realize-time override path the deferred 0018 note called for; it does
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NOT touch vendor/device ids (those ARE driver-binding and would break drivers).
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Inert unless a spoof-seed is set.
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diff --git a/hw/pci/pci.c b/hw/pci/pci.c
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index 2c3657d..e3da2ab 100644
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--- a/hw/pci/pci.c
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+++ b/hw/pci/pci.c
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@@ -23,6 +23,7 @@
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*/
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#include "qemu/osdep.h"
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+#include "hw/misc/spoof.h"
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#include "qemu/datadir.h"
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#include "qemu/units.h"
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#include "hw/core/irq.h"
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@@ -1417,6 +1418,27 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev,
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assert(!pc->subsystem_vendor_id);
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assert(!pc->subsystem_id);
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}
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+
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+ /*
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+ * qemu-spoof: OEM-brand the subsystem id of emulated devices. Real boards
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+ * carry the vendor's SSID; QEMU stamps a constant 1b36:1100 default on every
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+ * device, which is itself a fleet fingerprint. The subsystem id does not take
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+ * part in driver binding, so this is safe -- EXCEPT for Red Hat/virtio
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+ * (0x1af4), where legacy-virtio encodes the device type in the subsystem id;
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+ * skip those (virtio is de-fingerprinted by device choice, not id spoofing).
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+ * vfio passthrough overwrites this later with the real hardware SSID. Inert
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+ * unless a spoof-seed is set.
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+ */
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+ if (spoof_enabled() && !is_bridge &&
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+ pci_get_word(pci_dev->config + PCI_VENDOR_ID) != 0x1af4) {
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+ const char *role = object_get_typename(OBJECT(pci_dev));
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+ pci_set_word(pci_dev->config + PCI_SUBSYSTEM_VENDOR_ID,
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+ spoof_pci_subvendor(
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+ pci_get_word(pci_dev->config + PCI_SUBSYSTEM_VENDOR_ID)));
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+ pci_set_word(pci_dev->config + PCI_SUBSYSTEM_ID,
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+ spoof_pci_subdevice(role,
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+ pci_get_word(pci_dev->config + PCI_SUBSYSTEM_ID)));
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+ }
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pci_init_cmask(pci_dev);
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pci_init_wmask(pci_dev);
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pci_init_w1cmask(pci_dev);
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