From: Cédric Le Goater <c...@kaod.org> PCI devices needing a ROM allocate an optional MemoryRegion with pci_add_option_rom(). pci_del_option_rom() does the cleanup when the device is destroyed. The only action taken by this routine is to call vmstate_unregister_ram() which clears the id string of the optional ROM RAMBlock and now, also flags the RAMBlock as non-migratable. This was recently added by commit b895de502717 ("migration: discard non-migratable RAMBlocks"), .
VFIO devices do their own loading of the PCI option ROM in vfio_pci_size_rom(). The memory region is switched to an I/O region and the PCI attribute 'has_rom' is set but the RAMBlock of the ROM region is not allocated. When the associated PCI device is deleted, pci_del_option_rom() calls vmstate_unregister_ram() which tries to flag a NULL RAMBlock, leading to a SEGV. It seems that 'has_rom' was set to have memory_region_destroy() called, but since commit 469b046ead06 ("memory: remove memory_region_destroy") this is not necessary anymore as the MemoryRegion is freed automagically. Remove the PCIDevice 'has_rom' attribute setting in vfio. Fixes: b895de502717 ("migration: discard non-migratable RAMBlocks") Signed-off-by: Cédric Le Goater <c...@kaod.org> Reviewed-by: Michael S. Tsirkin <m...@redhat.com> Signed-off-by: Alex Williamson <alex.william...@redhat.com> --- hw/vfio/pci.c | 1 - 1 file changed, 1 deletion(-) diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index a1577dea7fdb..6cbb8fa0549d 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -990,7 +990,6 @@ static void vfio_pci_size_rom(VFIOPCIDevice *vdev) pci_register_bar(&vdev->pdev, PCI_ROM_SLOT, PCI_BASE_ADDRESS_SPACE_MEMORY, &vdev->pdev.rom); - vdev->pdev.has_rom = true; vdev->rom_read_failed = false; }