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hw/pci: Use -1 as the default value for rombar

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vfio_pci_size_rom() distinguishes whether rombar is explicitly set to 1
by checking dev->opts, bypassing the QOM property infrastructure.

Use -1 as the default value for rombar to tell if the user explicitly
set it to 1. The property is also converted from unsigned to signed.
-1 is signed so it is safe to give it a new meaning. The values in
[2 ^ 31, 2 ^ 32) become invalid, but nobody should have typed these
values by chance.

Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20250104-reuse-v18-13-c349eafd8673@daynix.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Akihiko Odaki 2024-02-12 19:20:29 +09:00 • committed by Philippe Mathieu-Daudé
parent 3f8bcbba3b
commit a7a3784128
3 changed files with 4 additions and 5 deletions
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5
hw/vfio/pci.c
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@ -1012,7 +1012,6 @@ static void vfio_pci_size_rom(VFIOPCIDevice *vdev)
{
uint32_t orig, size = cpu_to_le32((uint32_t)PCI_ROM_ADDRESS_MASK);
off_t offset = vdev->config_offset + PCI_ROM_ADDRESS;
DeviceState *dev = DEVICE(vdev);
char *name;
int fd = vdev->vbasedev.fd;
@ -1046,12 +1045,12 @@ static void vfio_pci_size_rom(VFIOPCIDevice *vdev)
}
if (vfio_opt_rom_in_denylist(vdev)) {
if (dev->opts && qdict_haskey(dev->opts, "rombar")) {
if (vdev->pdev.rom_bar > 0) {
warn_report("Device at %s is known to cause system instability"
" issues during option rom execution",
vdev->vbasedev.name);
error_printf("Proceeding anyway since user specified"
" non zero value for rombar\n");
" positive value for rombar\n");
} else {
warn_report("Rom loading for device at %s has been disabled"
" due to system instability issues",